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<h1 id="horizontal-scaling-strategies">Horizontal Scaling Strategies<a class="headerlink" href="#horizontal-scaling-strategies" title="Permanent link">&para;</a></h1>
<h2 id="overview">Overview<a class="headerlink" href="#overview" title="Permanent link">&para;</a></h2>
<p>Changemaker Lite V2 can scale horizontally to handle increased traffic and data volume. This guide covers strategies for scaling each component.</p>
<p><strong>When to Scale:</strong>
- API response time &gt;500ms (P95)
- CPU usage &gt;70% sustained
- Memory usage &gt;80% sustained
- Database connection pool exhausted
- Job queue backing up (&gt;100 jobs waiting)</p>
<hr />
<h2 id="database-scaling">Database Scaling<a class="headerlink" href="#database-scaling" title="Permanent link">&para;</a></h2>
<h3 id="read-replicas">Read Replicas<a class="headerlink" href="#read-replicas" title="Permanent link">&para;</a></h3>
<p><strong>PostgreSQL streaming replication</strong> for read-heavy workloads.</p>
<p><strong>Setup</strong> (docker-compose.yml):
<div class="language-yaml highlight"><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="nt">v2-postgres-replica</span><span class="p">:</span>
</span><span id="__span-0-2"><a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a><span class="w"> </span><span class="nt">image</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">postgres:16-alpine</span>
</span><span id="__span-0-3"><a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a><span class="w"> </span><span class="nt">container_name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">changemaker-v2-postgres-replica</span>
</span><span id="__span-0-4"><a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a><span class="w"> </span><span class="nt">environment</span><span class="p">:</span>
</span><span id="__span-0-5"><a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a><span class="w"> </span><span class="nt">POSTGRES_USER</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">replicator</span>
</span><span id="__span-0-6"><a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a><span class="w"> </span><span class="nt">POSTGRES_PASSWORD</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">${REPLICA_PASSWORD}</span>
</span><span id="__span-0-7"><a id="__codelineno-0-7" name="__codelineno-0-7" href="#__codelineno-0-7"></a><span class="w"> </span><span class="nt">command</span><span class="p">:</span><span class="w"> </span><span class="p p-Indicator">|</span>
</span><span id="__span-0-8"><a id="__codelineno-0-8" name="__codelineno-0-8" href="#__codelineno-0-8"></a><span class="w"> </span><span class="no">postgres -c wal_level=replica</span>
</span><span id="__span-0-9"><a id="__codelineno-0-9" name="__codelineno-0-9" href="#__codelineno-0-9"></a><span class="w"> </span><span class="no">-c hot_standby=on</span>
</span><span id="__span-0-10"><a id="__codelineno-0-10" name="__codelineno-0-10" href="#__codelineno-0-10"></a><span class="w"> </span><span class="no">-c max_wal_senders=3</span>
</span><span id="__span-0-11"><a id="__codelineno-0-11" name="__codelineno-0-11" href="#__codelineno-0-11"></a><span class="w"> </span><span class="no">-c hot_standby_feedback=on</span>
</span><span id="__span-0-12"><a id="__codelineno-0-12" name="__codelineno-0-12" href="#__codelineno-0-12"></a><span class="w"> </span><span class="nt">volumes</span><span class="p">:</span>
</span><span id="__span-0-13"><a id="__codelineno-0-13" name="__codelineno-0-13" href="#__codelineno-0-13"></a><span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">v2-postgres-replica-data:/var/lib/postgresql/data</span>
</span></code></pre></div></p>
<p><strong>Primary config</strong> (postgresql.conf):
<div class="language-ini highlight"><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a><span class="na">wal_level</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">replica</span>
</span><span id="__span-1-2"><a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a><span class="na">max_wal_senders</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">3</span>
</span><span id="__span-1-3"><a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a><span class="na">wal_keep_size</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">64MB</span>
</span></code></pre></div></p>
<p><strong>Replication user</strong>:
<div class="language-sql highlight"><pre><span></span><code><span id="__span-2-1"><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a><span class="k">CREATE</span><span class="w"> </span><span class="k">ROLE</span><span class="w"> </span><span class="n">replicator</span><span class="w"> </span><span class="k">WITH</span><span class="w"> </span><span class="n">REPLICATION</span><span class="w"> </span><span class="n">LOGIN</span><span class="w"> </span><span class="n">PASSWORD</span><span class="w"> </span><span class="s1">&#39;replica-password&#39;</span><span class="p">;</span>
</span></code></pre></div></p>
<p><strong>Prisma read replica</strong> (planned feature):
<div class="language-typescript highlight"><pre><span></span><code><span id="__span-3-1"><a id="__codelineno-3-1" name="__codelineno-3-1" href="#__codelineno-3-1"></a><span class="c1">// Future: Prisma read replicas</span>
</span><span id="__span-3-2"><a id="__codelineno-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></a><span class="kd">const</span><span class="w"> </span><span class="nx">prisma</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="ow">new</span><span class="w"> </span><span class="nx">PrismaClient</span><span class="p">({</span>
</span><span id="__span-3-3"><a id="__codelineno-3-3" name="__codelineno-3-3" href="#__codelineno-3-3"></a><span class="w"> </span><span class="nx">datasources</span><span class="o">:</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-3-4"><a id="__codelineno-3-4" name="__codelineno-3-4" href="#__codelineno-3-4"></a><span class="w"> </span><span class="nx">db</span><span class="o">:</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-3-5"><a id="__codelineno-3-5" name="__codelineno-3-5" href="#__codelineno-3-5"></a><span class="w"> </span><span class="nx">url</span><span class="o">:</span><span class="w"> </span><span class="kt">process.env.DATABASE_URL</span><span class="p">,</span><span class="w"> </span><span class="c1">// Primary (writes)</span>
</span><span id="__span-3-6"><a id="__codelineno-3-6" name="__codelineno-3-6" href="#__codelineno-3-6"></a><span class="w"> </span><span class="nx">replicaUrl</span><span class="o">:</span><span class="w"> </span><span class="kt">process.env.REPLICA_URL</span><span class="p">,</span><span class="w"> </span><span class="c1">// Replica (reads)</span>
</span><span id="__span-3-7"><a id="__codelineno-3-7" name="__codelineno-3-7" href="#__codelineno-3-7"></a><span class="w"> </span><span class="p">},</span>
</span><span id="__span-3-8"><a id="__codelineno-3-8" name="__codelineno-3-8" href="#__codelineno-3-8"></a><span class="w"> </span><span class="p">},</span>
</span><span id="__span-3-9"><a id="__codelineno-3-9" name="__codelineno-3-9" href="#__codelineno-3-9"></a><span class="p">});</span>
</span></code></pre></div></p>
<hr />
<h3 id="connection-pooling">Connection Pooling<a class="headerlink" href="#connection-pooling" title="Permanent link">&para;</a></h3>
<p><strong>PgBouncer</strong> for connection pooling.</p>
<p><strong>docker-compose.yml</strong>:
<div class="language-yaml highlight"><pre><span></span><code><span id="__span-4-1"><a id="__codelineno-4-1" name="__codelineno-4-1" href="#__codelineno-4-1"></a><span class="nt">pgbouncer</span><span class="p">:</span>
</span><span id="__span-4-2"><a id="__codelineno-4-2" name="__codelineno-4-2" href="#__codelineno-4-2"></a><span class="w"> </span><span class="nt">image</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">pgbouncer/pgbouncer:latest</span>
</span><span id="__span-4-3"><a id="__codelineno-4-3" name="__codelineno-4-3" href="#__codelineno-4-3"></a><span class="w"> </span><span class="nt">container_name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">pgbouncer-changemaker</span>
</span><span id="__span-4-4"><a id="__codelineno-4-4" name="__codelineno-4-4" href="#__codelineno-4-4"></a><span class="w"> </span><span class="nt">environment</span><span class="p">:</span>
</span><span id="__span-4-5"><a id="__codelineno-4-5" name="__codelineno-4-5" href="#__codelineno-4-5"></a><span class="w"> </span><span class="nt">DATABASES_HOST</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">changemaker-v2-postgres</span>
</span><span id="__span-4-6"><a id="__codelineno-4-6" name="__codelineno-4-6" href="#__codelineno-4-6"></a><span class="w"> </span><span class="nt">DATABASES_PORT</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">5432</span>
</span><span id="__span-4-7"><a id="__codelineno-4-7" name="__codelineno-4-7" href="#__codelineno-4-7"></a><span class="w"> </span><span class="nt">DATABASES_USER</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">changemaker</span>
</span><span id="__span-4-8"><a id="__codelineno-4-8" name="__codelineno-4-8" href="#__codelineno-4-8"></a><span class="w"> </span><span class="nt">DATABASES_PASSWORD</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">${V2_POSTGRES_PASSWORD}</span>
</span><span id="__span-4-9"><a id="__codelineno-4-9" name="__codelineno-4-9" href="#__codelineno-4-9"></a><span class="w"> </span><span class="nt">DATABASES_DBNAME</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">changemaker_v2</span>
</span><span id="__span-4-10"><a id="__codelineno-4-10" name="__codelineno-4-10" href="#__codelineno-4-10"></a><span class="w"> </span><span class="nt">POOL_MODE</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">transaction</span>
</span><span id="__span-4-11"><a id="__codelineno-4-11" name="__codelineno-4-11" href="#__codelineno-4-11"></a><span class="w"> </span><span class="nt">MAX_CLIENT_CONN</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">1000</span>
</span><span id="__span-4-12"><a id="__codelineno-4-12" name="__codelineno-4-12" href="#__codelineno-4-12"></a><span class="w"> </span><span class="nt">DEFAULT_POOL_SIZE</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">20</span>
</span><span id="__span-4-13"><a id="__codelineno-4-13" name="__codelineno-4-13" href="#__codelineno-4-13"></a><span class="w"> </span><span class="nt">ports</span><span class="p">:</span>
</span><span id="__span-4-14"><a id="__codelineno-4-14" name="__codelineno-4-14" href="#__codelineno-4-14"></a><span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="s">&quot;6432:6432&quot;</span>
</span></code></pre></div></p>
<p><strong>Update DATABASE_URL</strong>:
<div class="language-bash highlight"><pre><span></span><code><span id="__span-5-1"><a id="__codelineno-5-1" name="__codelineno-5-1" href="#__codelineno-5-1"></a><span class="c1"># Before (direct)</span>
</span><span id="__span-5-2"><a id="__codelineno-5-2" name="__codelineno-5-2" href="#__codelineno-5-2"></a><span class="nv">DATABASE_URL</span><span class="o">=</span>postgresql://changemaker:pass@changemaker-v2-postgres:5432/changemaker_v2
</span><span id="__span-5-3"><a id="__codelineno-5-3" name="__codelineno-5-3" href="#__codelineno-5-3"></a>
</span><span id="__span-5-4"><a id="__codelineno-5-4" name="__codelineno-5-4" href="#__codelineno-5-4"></a><span class="c1"># After (pooled)</span>
</span><span id="__span-5-5"><a id="__codelineno-5-5" name="__codelineno-5-5" href="#__codelineno-5-5"></a><span class="nv">DATABASE_URL</span><span class="o">=</span>postgresql://changemaker:pass@pgbouncer:6432/changemaker_v2
</span></code></pre></div></p>
<p><strong>Benefits</strong>:
- Handles 1000+ client connections with only 20 PostgreSQL connections
- Reduces connection overhead
- Prevents "too many connections" errors</p>
<hr />
<h2 id="api-scaling">API Scaling<a class="headerlink" href="#api-scaling" title="Permanent link">&para;</a></h2>
<h3 id="multiple-api-containers">Multiple API Containers<a class="headerlink" href="#multiple-api-containers" title="Permanent link">&para;</a></h3>
<p><strong>docker-compose.yml</strong>:
<div class="language-yaml highlight"><pre><span></span><code><span id="__span-6-1"><a id="__codelineno-6-1" name="__codelineno-6-1" href="#__codelineno-6-1"></a><span class="nt">api</span><span class="p">:</span>
</span><span id="__span-6-2"><a id="__codelineno-6-2" name="__codelineno-6-2" href="#__codelineno-6-2"></a><span class="w"> </span><span class="c1"># ... existing config</span>
</span><span id="__span-6-3"><a id="__codelineno-6-3" name="__codelineno-6-3" href="#__codelineno-6-3"></a><span class="w"> </span><span class="nt">deploy</span><span class="p">:</span>
</span><span id="__span-6-4"><a id="__codelineno-6-4" name="__codelineno-6-4" href="#__codelineno-6-4"></a><span class="w"> </span><span class="nt">replicas</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">3</span><span class="w"> </span><span class="c1"># Run 3 API containers</span>
</span></code></pre></div></p>
<p><strong>Or manual scaling</strong>:
<div class="language-bash highlight"><pre><span></span><code><span id="__span-7-1"><a id="__codelineno-7-1" name="__codelineno-7-1" href="#__codelineno-7-1"></a>docker<span class="w"> </span>compose<span class="w"> </span>up<span class="w"> </span>-d<span class="w"> </span>--scale<span class="w"> </span><span class="nv">api</span><span class="o">=</span><span class="m">3</span>
</span></code></pre></div></p>
<p><strong>Load balancer</strong> (Nginx upstream):
<div class="language-nginx highlight"><pre><span></span><code><span id="__span-8-1"><a id="__codelineno-8-1" name="__codelineno-8-1" href="#__codelineno-8-1"></a><span class="k">upstream</span><span class="w"> </span><span class="s">api_backend</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-8-2"><a id="__codelineno-8-2" name="__codelineno-8-2" href="#__codelineno-8-2"></a><span class="w"> </span><span class="kn">least_conn</span><span class="p">;</span><span class="w"> </span><span class="c1"># Load balancing algorithm</span>
</span><span id="__span-8-3"><a id="__codelineno-8-3" name="__codelineno-8-3" href="#__codelineno-8-3"></a><span class="w"> </span><span class="kn">server</span><span class="w"> </span><span class="n">changemaker-v2-api-1</span><span class="p">:</span><span class="mi">4000</span><span class="p">;</span>
</span><span id="__span-8-4"><a id="__codelineno-8-4" name="__codelineno-8-4" href="#__codelineno-8-4"></a><span class="w"> </span><span class="kn">server</span><span class="w"> </span><span class="n">changemaker-v2-api-2</span><span class="p">:</span><span class="mi">4000</span><span class="p">;</span>
</span><span id="__span-8-5"><a id="__codelineno-8-5" name="__codelineno-8-5" href="#__codelineno-8-5"></a><span class="w"> </span><span class="kn">server</span><span class="w"> </span><span class="n">changemaker-v2-api-3</span><span class="p">:</span><span class="mi">4000</span><span class="p">;</span>
</span><span id="__span-8-6"><a id="__codelineno-8-6" name="__codelineno-8-6" href="#__codelineno-8-6"></a><span class="p">}</span>
</span><span id="__span-8-7"><a id="__codelineno-8-7" name="__codelineno-8-7" href="#__codelineno-8-7"></a>
</span><span id="__span-8-8"><a id="__codelineno-8-8" name="__codelineno-8-8" href="#__codelineno-8-8"></a><span class="k">server</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-8-9"><a id="__codelineno-8-9" name="__codelineno-8-9" href="#__codelineno-8-9"></a><span class="w"> </span><span class="kn">location</span><span class="w"> </span><span class="s">/api/</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-8-10"><a id="__codelineno-8-10" name="__codelineno-8-10" href="#__codelineno-8-10"></a><span class="w"> </span><span class="kn">proxy_pass</span><span class="w"> </span><span class="s">http://api_backend</span><span class="p">;</span>
</span><span id="__span-8-11"><a id="__codelineno-8-11" name="__codelineno-8-11" href="#__codelineno-8-11"></a><span class="w"> </span><span class="p">}</span>
</span><span id="__span-8-12"><a id="__codelineno-8-12" name="__codelineno-8-12" href="#__codelineno-8-12"></a><span class="p">}</span>
</span></code></pre></div></p>
<p><strong>Session affinity</strong> (sticky sessions):
<div class="language-nginx highlight"><pre><span></span><code><span id="__span-9-1"><a id="__codelineno-9-1" name="__codelineno-9-1" href="#__codelineno-9-1"></a><span class="k">upstream</span><span class="w"> </span><span class="s">api_backend</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-9-2"><a id="__codelineno-9-2" name="__codelineno-9-2" href="#__codelineno-9-2"></a><span class="w"> </span><span class="kn">ip_hash</span><span class="p">;</span><span class="w"> </span><span class="c1"># Route same IP to same backend</span>
</span><span id="__span-9-3"><a id="__codelineno-9-3" name="__codelineno-9-3" href="#__codelineno-9-3"></a><span class="w"> </span><span class="kn">server</span><span class="w"> </span><span class="n">changemaker-v2-api-1</span><span class="p">:</span><span class="mi">4000</span><span class="p">;</span>
</span><span id="__span-9-4"><a id="__codelineno-9-4" name="__codelineno-9-4" href="#__codelineno-9-4"></a><span class="w"> </span><span class="kn">server</span><span class="w"> </span><span class="n">changemaker-v2-api-2</span><span class="p">:</span><span class="mi">4000</span><span class="p">;</span>
</span><span id="__span-9-5"><a id="__codelineno-9-5" name="__codelineno-9-5" href="#__codelineno-9-5"></a><span class="p">}</span>
</span></code></pre></div></p>
<hr />
<h3 id="vertical-scaling-resource-limits">Vertical Scaling (Resource Limits)<a class="headerlink" href="#vertical-scaling-resource-limits" title="Permanent link">&para;</a></h3>
<p><strong>Increase container resources</strong>:
<div class="language-yaml highlight"><pre><span></span><code><span id="__span-10-1"><a id="__codelineno-10-1" name="__codelineno-10-1" href="#__codelineno-10-1"></a><span class="nt">api</span><span class="p">:</span>
</span><span id="__span-10-2"><a id="__codelineno-10-2" name="__codelineno-10-2" href="#__codelineno-10-2"></a><span class="w"> </span><span class="nt">deploy</span><span class="p">:</span>
</span><span id="__span-10-3"><a id="__codelineno-10-3" name="__codelineno-10-3" href="#__codelineno-10-3"></a><span class="w"> </span><span class="nt">resources</span><span class="p">:</span>
</span><span id="__span-10-4"><a id="__codelineno-10-4" name="__codelineno-10-4" href="#__codelineno-10-4"></a><span class="w"> </span><span class="nt">limits</span><span class="p">:</span>
</span><span id="__span-10-5"><a id="__codelineno-10-5" name="__codelineno-10-5" href="#__codelineno-10-5"></a><span class="w"> </span><span class="nt">cpus</span><span class="p">:</span><span class="w"> </span><span class="s">&#39;4&#39;</span><span class="w"> </span><span class="c1"># 4 CPU cores</span>
</span><span id="__span-10-6"><a id="__codelineno-10-6" name="__codelineno-10-6" href="#__codelineno-10-6"></a><span class="w"> </span><span class="nt">memory</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">4G</span><span class="w"> </span><span class="c1"># 4GB RAM</span>
</span><span id="__span-10-7"><a id="__codelineno-10-7" name="__codelineno-10-7" href="#__codelineno-10-7"></a><span class="w"> </span><span class="nt">reservations</span><span class="p">:</span>
</span><span id="__span-10-8"><a id="__codelineno-10-8" name="__codelineno-10-8" href="#__codelineno-10-8"></a><span class="w"> </span><span class="nt">cpus</span><span class="p">:</span><span class="w"> </span><span class="s">&#39;1&#39;</span>
</span><span id="__span-10-9"><a id="__codelineno-10-9" name="__codelineno-10-9" href="#__codelineno-10-9"></a><span class="w"> </span><span class="nt">memory</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">1G</span>
</span></code></pre></div></p>
<p><strong>Node.js memory limit</strong>:
<div class="language-yaml highlight"><pre><span></span><code><span id="__span-11-1"><a id="__codelineno-11-1" name="__codelineno-11-1" href="#__codelineno-11-1"></a><span class="nt">api</span><span class="p">:</span>
</span><span id="__span-11-2"><a id="__codelineno-11-2" name="__codelineno-11-2" href="#__codelineno-11-2"></a><span class="w"> </span><span class="nt">environment</span><span class="p">:</span>
</span><span id="__span-11-3"><a id="__codelineno-11-3" name="__codelineno-11-3" href="#__codelineno-11-3"></a><span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">NODE_OPTIONS=--max-old-space-size=3072</span><span class="w"> </span><span class="c1"># 3GB heap</span>
</span></code></pre></div></p>
<hr />
<h2 id="redis-scaling">Redis Scaling<a class="headerlink" href="#redis-scaling" title="Permanent link">&para;</a></h2>
<h3 id="redis-cluster-sharding">Redis Cluster (Sharding)<a class="headerlink" href="#redis-cluster-sharding" title="Permanent link">&para;</a></h3>
<p><strong>For &gt;100GB datasets</strong> or high throughput.</p>
<p><strong>docker-compose.yml</strong> (6-node cluster):
<div class="language-yaml highlight"><pre><span></span><code><span id="__span-12-1"><a id="__codelineno-12-1" name="__codelineno-12-1" href="#__codelineno-12-1"></a><span class="nt">redis-cluster-1</span><span class="p">:</span>
</span><span id="__span-12-2"><a id="__codelineno-12-2" name="__codelineno-12-2" href="#__codelineno-12-2"></a><span class="w"> </span><span class="nt">image</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">redis:7-alpine</span>
</span><span id="__span-12-3"><a id="__codelineno-12-3" name="__codelineno-12-3" href="#__codelineno-12-3"></a><span class="w"> </span><span class="nt">command</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">redis-server --cluster-enabled yes --cluster-config-file nodes.conf</span>
</span><span id="__span-12-4"><a id="__codelineno-12-4" name="__codelineno-12-4" href="#__codelineno-12-4"></a>
</span><span id="__span-12-5"><a id="__codelineno-12-5" name="__codelineno-12-5" href="#__codelineno-12-5"></a><span class="c1"># ... repeat for redis-cluster-2 through redis-cluster-6</span>
</span></code></pre></div></p>
<p><strong>Create cluster</strong>:
<div class="language-bash highlight"><pre><span></span><code><span id="__span-13-1"><a id="__codelineno-13-1" name="__codelineno-13-1" href="#__codelineno-13-1"></a>docker<span class="w"> </span>compose<span class="w"> </span><span class="nb">exec</span><span class="w"> </span>redis-cluster-1<span class="w"> </span>redis-cli<span class="w"> </span>--cluster<span class="w"> </span>create<span class="w"> </span><span class="se">\</span>
</span><span id="__span-13-2"><a id="__codelineno-13-2" name="__codelineno-13-2" href="#__codelineno-13-2"></a><span class="w"> </span>redis-cluster-1:6379<span class="w"> </span><span class="se">\</span>
</span><span id="__span-13-3"><a id="__codelineno-13-3" name="__codelineno-13-3" href="#__codelineno-13-3"></a><span class="w"> </span>redis-cluster-2:6379<span class="w"> </span><span class="se">\</span>
</span><span id="__span-13-4"><a id="__codelineno-13-4" name="__codelineno-13-4" href="#__codelineno-13-4"></a><span class="w"> </span>redis-cluster-3:6379<span class="w"> </span><span class="se">\</span>
</span><span id="__span-13-5"><a id="__codelineno-13-5" name="__codelineno-13-5" href="#__codelineno-13-5"></a><span class="w"> </span>redis-cluster-4:6379<span class="w"> </span><span class="se">\</span>
</span><span id="__span-13-6"><a id="__codelineno-13-6" name="__codelineno-13-6" href="#__codelineno-13-6"></a><span class="w"> </span>redis-cluster-5:6379<span class="w"> </span><span class="se">\</span>
</span><span id="__span-13-7"><a id="__codelineno-13-7" name="__codelineno-13-7" href="#__codelineno-13-7"></a><span class="w"> </span>redis-cluster-6:6379<span class="w"> </span><span class="se">\</span>
</span><span id="__span-13-8"><a id="__codelineno-13-8" name="__codelineno-13-8" href="#__codelineno-13-8"></a><span class="w"> </span>--cluster-replicas<span class="w"> </span><span class="m">1</span>
</span></code></pre></div></p>
<hr />
<h3 id="redis-sentinel-high-availability">Redis Sentinel (High Availability)<a class="headerlink" href="#redis-sentinel-high-availability" title="Permanent link">&para;</a></h3>
<p><strong>Automatic failover</strong> for Redis.</p>
<p><strong>docker-compose.yml</strong>:
<div class="language-yaml highlight"><pre><span></span><code><span id="__span-14-1"><a id="__codelineno-14-1" name="__codelineno-14-1" href="#__codelineno-14-1"></a><span class="nt">redis-sentinel-1</span><span class="p">:</span>
</span><span id="__span-14-2"><a id="__codelineno-14-2" name="__codelineno-14-2" href="#__codelineno-14-2"></a><span class="w"> </span><span class="nt">image</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">redis:7-alpine</span>
</span><span id="__span-14-3"><a id="__codelineno-14-3" name="__codelineno-14-3" href="#__codelineno-14-3"></a><span class="w"> </span><span class="nt">command</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">redis-sentinel /etc/redis/sentinel.conf</span>
</span><span id="__span-14-4"><a id="__codelineno-14-4" name="__codelineno-14-4" href="#__codelineno-14-4"></a><span class="w"> </span><span class="nt">volumes</span><span class="p">:</span>
</span><span id="__span-14-5"><a id="__codelineno-14-5" name="__codelineno-14-5" href="#__codelineno-14-5"></a><span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">./configs/redis/sentinel.conf:/etc/redis/sentinel.conf</span>
</span><span id="__span-14-6"><a id="__codelineno-14-6" name="__codelineno-14-6" href="#__codelineno-14-6"></a>
</span><span id="__span-14-7"><a id="__codelineno-14-7" name="__codelineno-14-7" href="#__codelineno-14-7"></a><span class="c1"># ... repeat for sentinel-2, sentinel-3</span>
</span></code></pre></div></p>
<p><strong>sentinel.conf</strong>:
<div class="language-ini highlight"><pre><span></span><code><span id="__span-15-1"><a id="__codelineno-15-1" name="__codelineno-15-1" href="#__codelineno-15-1"></a><span class="na">sentinel monitor mymaster redis-primary 6379 2</span>
</span><span id="__span-15-2"><a id="__codelineno-15-2" name="__codelineno-15-2" href="#__codelineno-15-2"></a><span class="na">sentinel down-after-milliseconds mymaster 5000</span>
</span><span id="__span-15-3"><a id="__codelineno-15-3" name="__codelineno-15-3" href="#__codelineno-15-3"></a><span class="na">sentinel parallel-syncs mymaster 1</span>
</span><span id="__span-15-4"><a id="__codelineno-15-4" name="__codelineno-15-4" href="#__codelineno-15-4"></a><span class="na">sentinel failover-timeout mymaster 10000</span>
</span></code></pre></div></p>
<hr />
<h2 id="media-api-scaling">Media API Scaling<a class="headerlink" href="#media-api-scaling" title="Permanent link">&para;</a></h2>
<h3 id="separate-media-containers">Separate Media Containers<a class="headerlink" href="#separate-media-containers" title="Permanent link">&para;</a></h3>
<p><strong>docker-compose.yml</strong>:
<div class="language-yaml highlight"><pre><span></span><code><span id="__span-16-1"><a id="__codelineno-16-1" name="__codelineno-16-1" href="#__codelineno-16-1"></a><span class="nt">media-api</span><span class="p">:</span>
</span><span id="__span-16-2"><a id="__codelineno-16-2" name="__codelineno-16-2" href="#__codelineno-16-2"></a><span class="w"> </span><span class="nt">deploy</span><span class="p">:</span>
</span><span id="__span-16-3"><a id="__codelineno-16-3" name="__codelineno-16-3" href="#__codelineno-16-3"></a><span class="w"> </span><span class="nt">replicas</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">2</span><span class="w"> </span><span class="c1"># Run 2 media API containers</span>
</span></code></pre></div></p>
<p><strong>Nginx load balancer</strong>:
<div class="language-nginx highlight"><pre><span></span><code><span id="__span-17-1"><a id="__codelineno-17-1" name="__codelineno-17-1" href="#__codelineno-17-1"></a><span class="k">upstream</span><span class="w"> </span><span class="s">media_backend</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-17-2"><a id="__codelineno-17-2" name="__codelineno-17-2" href="#__codelineno-17-2"></a><span class="w"> </span><span class="kn">server</span><span class="w"> </span><span class="n">changemaker-media-api-1</span><span class="p">:</span><span class="mi">4100</span><span class="p">;</span>
</span><span id="__span-17-3"><a id="__codelineno-17-3" name="__codelineno-17-3" href="#__codelineno-17-3"></a><span class="w"> </span><span class="kn">server</span><span class="w"> </span><span class="n">changemaker-media-api-2</span><span class="p">:</span><span class="mi">4100</span><span class="p">;</span>
</span><span id="__span-17-4"><a id="__codelineno-17-4" name="__codelineno-17-4" href="#__codelineno-17-4"></a><span class="p">}</span>
</span><span id="__span-17-5"><a id="__codelineno-17-5" name="__codelineno-17-5" href="#__codelineno-17-5"></a>
</span><span id="__span-17-6"><a id="__codelineno-17-6" name="__codelineno-17-6" href="#__codelineno-17-6"></a><span class="k">location</span><span class="w"> </span><span class="s">/api/media/</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-17-7"><a id="__codelineno-17-7" name="__codelineno-17-7" href="#__codelineno-17-7"></a><span class="w"> </span><span class="kn">proxy_pass</span><span class="w"> </span><span class="s">http://media_backend</span><span class="p">;</span>
</span><span id="__span-17-8"><a id="__codelineno-17-8" name="__codelineno-17-8" href="#__codelineno-17-8"></a><span class="p">}</span>
</span></code></pre></div></p>
<p><strong>Shared volume</strong> (read-only):
<div class="language-yaml highlight"><pre><span></span><code><span id="__span-18-1"><a id="__codelineno-18-1" name="__codelineno-18-1" href="#__codelineno-18-1"></a><span class="nt">media-api</span><span class="p">:</span>
</span><span id="__span-18-2"><a id="__codelineno-18-2" name="__codelineno-18-2" href="#__codelineno-18-2"></a><span class="w"> </span><span class="nt">volumes</span><span class="p">:</span>
</span><span id="__span-18-3"><a id="__codelineno-18-3" name="__codelineno-18-3" href="#__codelineno-18-3"></a><span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">${MEDIA_ROOT}:/media:ro</span><span class="w"> </span><span class="c1"># All replicas read same library</span>
</span></code></pre></div></p>
<hr />
<h3 id="cdn-for-static-media">CDN for Static Media<a class="headerlink" href="#cdn-for-static-media" title="Permanent link">&para;</a></h3>
<p><strong>Cloudflare CDN</strong> (or similar):</p>
<p><strong>Setup</strong>:
1. Enable Cloudflare proxy (orange cloud)
2. Configure cache rules:
- Cache <code>/media/library/*.mp4</code> for 30 days
- Bypass cache for <code>/api/media/</code> (dynamic)</p>
<p><strong>Benefits</strong>:
- Offload video bandwidth
- Global edge caching
- DDoS protection</p>
<hr />
<h2 id="frontend-scaling">Frontend Scaling<a class="headerlink" href="#frontend-scaling" title="Permanent link">&para;</a></h2>
<h3 id="cdn-for-static-assets">CDN for Static Assets<a class="headerlink" href="#cdn-for-static-assets" title="Permanent link">&para;</a></h3>
<p><strong>Vite production build</strong> → static files → CDN.</p>
<p><strong>Build</strong>:
<div class="language-bash highlight"><pre><span></span><code><span id="__span-19-1"><a id="__codelineno-19-1" name="__codelineno-19-1" href="#__codelineno-19-1"></a><span class="nb">cd</span><span class="w"> </span>admin<span class="w"> </span><span class="o">&amp;&amp;</span><span class="w"> </span>npm<span class="w"> </span>run<span class="w"> </span>build
</span></code></pre></div></p>
<p><strong>Upload to CDN</strong> (S3 + CloudFront):
<div class="language-bash highlight"><pre><span></span><code><span id="__span-20-1"><a id="__codelineno-20-1" name="__codelineno-20-1" href="#__codelineno-20-1"></a>aws<span class="w"> </span>s3<span class="w"> </span>sync<span class="w"> </span>dist/<span class="w"> </span>s3://changemaker-static/<span class="w"> </span>--delete
</span><span id="__span-20-2"><a id="__codelineno-20-2" name="__codelineno-20-2" href="#__codelineno-20-2"></a>aws<span class="w"> </span>cloudfront<span class="w"> </span>create-invalidation<span class="w"> </span>--distribution-id<span class="w"> </span>XYZ<span class="w"> </span>--paths<span class="w"> </span><span class="s2">&quot;/*&quot;</span>
</span></code></pre></div></p>
<p><strong>Benefits</strong>:
- Global edge caching
- Reduced origin load
- Faster page loads</p>
<hr />
<h3 id="nginx-caching">Nginx Caching<a class="headerlink" href="#nginx-caching" title="Permanent link">&para;</a></h3>
<p><strong>Proxy cache for API responses</strong>:
<div class="language-nginx highlight"><pre><span></span><code><span id="__span-21-1"><a id="__codelineno-21-1" name="__codelineno-21-1" href="#__codelineno-21-1"></a><span class="k">proxy_cache_path</span><span class="w"> </span><span class="s">/var/cache/nginx</span><span class="w"> </span><span class="s">levels=1:2</span><span class="w"> </span><span class="s">keys_zone=api_cache:10m</span><span class="w"> </span><span class="s">max_size=1g</span><span class="w"> </span><span class="s">inactive=60m</span><span class="p">;</span>
</span><span id="__span-21-2"><a id="__codelineno-21-2" name="__codelineno-21-2" href="#__codelineno-21-2"></a>
</span><span id="__span-21-3"><a id="__codelineno-21-3" name="__codelineno-21-3" href="#__codelineno-21-3"></a><span class="k">location</span><span class="w"> </span><span class="s">/api/campaigns</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-21-4"><a id="__codelineno-21-4" name="__codelineno-21-4" href="#__codelineno-21-4"></a><span class="w"> </span><span class="kn">proxy_cache</span><span class="w"> </span><span class="s">api_cache</span><span class="p">;</span>
</span><span id="__span-21-5"><a id="__codelineno-21-5" name="__codelineno-21-5" href="#__codelineno-21-5"></a><span class="w"> </span><span class="kn">proxy_cache_valid</span><span class="w"> </span><span class="mi">200</span><span class="w"> </span><span class="mi">10m</span><span class="p">;</span>
</span><span id="__span-21-6"><a id="__codelineno-21-6" name="__codelineno-21-6" href="#__codelineno-21-6"></a><span class="w"> </span><span class="kn">proxy_cache_key</span><span class="w"> </span><span class="s">&quot;</span><span class="nv">$scheme$request_method$host$request_uri&quot;</span><span class="p">;</span>
</span><span id="__span-21-7"><a id="__codelineno-21-7" name="__codelineno-21-7" href="#__codelineno-21-7"></a><span class="w"> </span><span class="kn">proxy_pass</span><span class="w"> </span><span class="s">http://changemaker-v2-api:4000</span><span class="p">;</span>
</span><span id="__span-21-8"><a id="__codelineno-21-8" name="__codelineno-21-8" href="#__codelineno-21-8"></a><span class="p">}</span>
</span></code></pre></div></p>
<p><strong>Cacheable endpoints</strong>:
- <code>/api/campaigns</code> (public listing, 10 minutes)
- <code>/api/representatives</code> (lookup cache, 1 hour)
- <code>/api/locations/public</code> (map data, 5 minutes)</p>
<p><strong>Never cache</strong>:
- POST/PUT/DELETE requests
- Authenticated endpoints
- Real-time data (canvass sessions)</p>
<hr />
<h2 id="job-queue-scaling">Job Queue Scaling<a class="headerlink" href="#job-queue-scaling" title="Permanent link">&para;</a></h2>
<h3 id="multiple-bullmq-workers">Multiple BullMQ Workers<a class="headerlink" href="#multiple-bullmq-workers" title="Permanent link">&para;</a></h3>
<p><strong>API container scaling</strong> also scales workers (each container runs worker).</p>
<p><strong>Alternative</strong>: Dedicated worker containers.</p>
<p><strong>docker-compose.yml</strong>:
<div class="language-yaml highlight"><pre><span></span><code><span id="__span-22-1"><a id="__codelineno-22-1" name="__codelineno-22-1" href="#__codelineno-22-1"></a><span class="nt">email-worker</span><span class="p">:</span>
</span><span id="__span-22-2"><a id="__codelineno-22-2" name="__codelineno-22-2" href="#__codelineno-22-2"></a><span class="w"> </span><span class="nt">build</span><span class="p">:</span>
</span><span id="__span-22-3"><a id="__codelineno-22-3" name="__codelineno-22-3" href="#__codelineno-22-3"></a><span class="w"> </span><span class="nt">context</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">./api</span>
</span><span id="__span-22-4"><a id="__codelineno-22-4" name="__codelineno-22-4" href="#__codelineno-22-4"></a><span class="w"> </span><span class="nt">container_name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">email-worker</span>
</span><span id="__span-22-5"><a id="__codelineno-22-5" name="__codelineno-22-5" href="#__codelineno-22-5"></a><span class="w"> </span><span class="nt">command</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">node dist/workers/email-worker.js</span>
</span><span id="__span-22-6"><a id="__codelineno-22-6" name="__codelineno-22-6" href="#__codelineno-22-6"></a><span class="w"> </span><span class="nt">environment</span><span class="p">:</span>
</span><span id="__span-22-7"><a id="__codelineno-22-7" name="__codelineno-22-7" href="#__codelineno-22-7"></a><span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">REDIS_URL=${REDIS_URL}</span>
</span><span id="__span-22-8"><a id="__codelineno-22-8" name="__codelineno-22-8" href="#__codelineno-22-8"></a><span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">SMTP_HOST=${SMTP_HOST}</span>
</span><span id="__span-22-9"><a id="__codelineno-22-9" name="__codelineno-22-9" href="#__codelineno-22-9"></a><span class="w"> </span><span class="c1"># ... other env vars</span>
</span><span id="__span-22-10"><a id="__codelineno-22-10" name="__codelineno-22-10" href="#__codelineno-22-10"></a><span class="w"> </span><span class="nt">depends_on</span><span class="p">:</span>
</span><span id="__span-22-11"><a id="__codelineno-22-11" name="__codelineno-22-11" href="#__codelineno-22-11"></a><span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">redis</span>
</span></code></pre></div></p>
<p><strong>Worker script</strong> (api/src/workers/email-worker.ts):
<div class="language-typescript highlight"><pre><span></span><code><span id="__span-23-1"><a id="__codelineno-23-1" name="__codelineno-23-1" href="#__codelineno-23-1"></a><span class="k">import</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="nx">emailQueue</span><span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="kr">from</span><span class="w"> </span><span class="s1">&#39;../services/email-queue.service&#39;</span><span class="p">;</span>
</span><span id="__span-23-2"><a id="__codelineno-23-2" name="__codelineno-23-2" href="#__codelineno-23-2"></a>
</span><span id="__span-23-3"><a id="__codelineno-23-3" name="__codelineno-23-3" href="#__codelineno-23-3"></a><span class="nx">emailQueue</span><span class="p">.</span><span class="nx">process</span><span class="p">(</span><span class="mf">10</span><span class="p">,</span><span class="w"> </span><span class="k">async</span><span class="w"> </span><span class="p">(</span><span class="nx">job</span><span class="p">)</span><span class="w"> </span><span class="p">=&gt;</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-23-4"><a id="__codelineno-23-4" name="__codelineno-23-4" href="#__codelineno-23-4"></a><span class="w"> </span><span class="c1">// Process email job</span>
</span><span id="__span-23-5"><a id="__codelineno-23-5" name="__codelineno-23-5" href="#__codelineno-23-5"></a><span class="p">});</span>
</span><span id="__span-23-6"><a id="__codelineno-23-6" name="__codelineno-23-6" href="#__codelineno-23-6"></a>
</span><span id="__span-23-7"><a id="__codelineno-23-7" name="__codelineno-23-7" href="#__codelineno-23-7"></a><span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="s1">&#39;Email worker started&#39;</span><span class="p">);</span>
</span></code></pre></div></p>
<p><strong>Scale workers</strong>:
<div class="language-bash highlight"><pre><span></span><code><span id="__span-24-1"><a id="__codelineno-24-1" name="__codelineno-24-1" href="#__codelineno-24-1"></a>docker<span class="w"> </span>compose<span class="w"> </span>up<span class="w"> </span>-d<span class="w"> </span>--scale<span class="w"> </span>email-worker<span class="o">=</span><span class="m">5</span>
</span></code></pre></div></p>
<hr />
<h2 id="monitoring-under-load">Monitoring Under Load<a class="headerlink" href="#monitoring-under-load" title="Permanent link">&para;</a></h2>
<h3 id="load-testing">Load Testing<a class="headerlink" href="#load-testing" title="Permanent link">&para;</a></h3>
<p><strong>k6 script</strong> (load-test.js):
<div class="language-javascript highlight"><pre><span></span><code><span id="__span-25-1"><a id="__codelineno-25-1" name="__codelineno-25-1" href="#__codelineno-25-1"></a><span class="k">import</span><span class="w"> </span><span class="nx">http</span><span class="w"> </span><span class="kr">from</span><span class="w"> </span><span class="s1">&#39;k6/http&#39;</span><span class="p">;</span>
</span><span id="__span-25-2"><a id="__codelineno-25-2" name="__codelineno-25-2" href="#__codelineno-25-2"></a><span class="k">import</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="nx">check</span><span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="kr">from</span><span class="w"> </span><span class="s1">&#39;k6&#39;</span><span class="p">;</span>
</span><span id="__span-25-3"><a id="__codelineno-25-3" name="__codelineno-25-3" href="#__codelineno-25-3"></a>
</span><span id="__span-25-4"><a id="__codelineno-25-4" name="__codelineno-25-4" href="#__codelineno-25-4"></a><span class="k">export</span><span class="w"> </span><span class="kd">let</span><span class="w"> </span><span class="nx">options</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-25-5"><a id="__codelineno-25-5" name="__codelineno-25-5" href="#__codelineno-25-5"></a><span class="w"> </span><span class="nx">stages</span><span class="o">:</span><span class="w"> </span><span class="p">[</span>
</span><span id="__span-25-6"><a id="__codelineno-25-6" name="__codelineno-25-6" href="#__codelineno-25-6"></a><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="nx">duration</span><span class="o">:</span><span class="w"> </span><span class="s1">&#39;1m&#39;</span><span class="p">,</span><span class="w"> </span><span class="nx">target</span><span class="o">:</span><span class="w"> </span><span class="mf">50</span><span class="w"> </span><span class="p">},</span><span class="w"> </span><span class="c1">// Ramp to 50 users</span>
</span><span id="__span-25-7"><a id="__codelineno-25-7" name="__codelineno-25-7" href="#__codelineno-25-7"></a><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="nx">duration</span><span class="o">:</span><span class="w"> </span><span class="s1">&#39;3m&#39;</span><span class="p">,</span><span class="w"> </span><span class="nx">target</span><span class="o">:</span><span class="w"> </span><span class="mf">50</span><span class="w"> </span><span class="p">},</span><span class="w"> </span><span class="c1">// Stay at 50 users</span>
</span><span id="__span-25-8"><a id="__codelineno-25-8" name="__codelineno-25-8" href="#__codelineno-25-8"></a><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="nx">duration</span><span class="o">:</span><span class="w"> </span><span class="s1">&#39;1m&#39;</span><span class="p">,</span><span class="w"> </span><span class="nx">target</span><span class="o">:</span><span class="w"> </span><span class="mf">100</span><span class="w"> </span><span class="p">},</span><span class="w"> </span><span class="c1">// Ramp to 100 users</span>
</span><span id="__span-25-9"><a id="__codelineno-25-9" name="__codelineno-25-9" href="#__codelineno-25-9"></a><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="nx">duration</span><span class="o">:</span><span class="w"> </span><span class="s1">&#39;3m&#39;</span><span class="p">,</span><span class="w"> </span><span class="nx">target</span><span class="o">:</span><span class="w"> </span><span class="mf">100</span><span class="w"> </span><span class="p">},</span><span class="w"> </span><span class="c1">// Stay at 100 users</span>
</span><span id="__span-25-10"><a id="__codelineno-25-10" name="__codelineno-25-10" href="#__codelineno-25-10"></a><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="nx">duration</span><span class="o">:</span><span class="w"> </span><span class="s1">&#39;1m&#39;</span><span class="p">,</span><span class="w"> </span><span class="nx">target</span><span class="o">:</span><span class="w"> </span><span class="mf">0</span><span class="w"> </span><span class="p">},</span><span class="w"> </span><span class="c1">// Ramp down</span>
</span><span id="__span-25-11"><a id="__codelineno-25-11" name="__codelineno-25-11" href="#__codelineno-25-11"></a><span class="w"> </span><span class="p">],</span>
</span><span id="__span-25-12"><a id="__codelineno-25-12" name="__codelineno-25-12" href="#__codelineno-25-12"></a><span class="p">};</span>
</span><span id="__span-25-13"><a id="__codelineno-25-13" name="__codelineno-25-13" href="#__codelineno-25-13"></a>
</span><span id="__span-25-14"><a id="__codelineno-25-14" name="__codelineno-25-14" href="#__codelineno-25-14"></a><span class="k">export</span><span class="w"> </span><span class="k">default</span><span class="w"> </span><span class="kd">function</span><span class="w"> </span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-25-15"><a id="__codelineno-25-15" name="__codelineno-25-15" href="#__codelineno-25-15"></a><span class="w"> </span><span class="kd">let</span><span class="w"> </span><span class="nx">res</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nx">http</span><span class="p">.</span><span class="nx">get</span><span class="p">(</span><span class="s1">&#39;http://api.cmlite.org/api/campaigns&#39;</span><span class="p">);</span>
</span><span id="__span-25-16"><a id="__codelineno-25-16" name="__codelineno-25-16" href="#__codelineno-25-16"></a><span class="w"> </span><span class="nx">check</span><span class="p">(</span><span class="nx">res</span><span class="p">,</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-25-17"><a id="__codelineno-25-17" name="__codelineno-25-17" href="#__codelineno-25-17"></a><span class="w"> </span><span class="s1">&#39;status 200&#39;</span><span class="o">:</span><span class="w"> </span><span class="p">(</span><span class="nx">r</span><span class="p">)</span><span class="w"> </span><span class="p">=&gt;</span><span class="w"> </span><span class="nx">r</span><span class="p">.</span><span class="nx">status</span><span class="w"> </span><span class="o">===</span><span class="w"> </span><span class="mf">200</span><span class="p">,</span>
</span><span id="__span-25-18"><a id="__codelineno-25-18" name="__codelineno-25-18" href="#__codelineno-25-18"></a><span class="w"> </span><span class="s1">&#39;response time &lt; 500ms&#39;</span><span class="o">:</span><span class="w"> </span><span class="p">(</span><span class="nx">r</span><span class="p">)</span><span class="w"> </span><span class="p">=&gt;</span><span class="w"> </span><span class="nx">r</span><span class="p">.</span><span class="nx">timings</span><span class="p">.</span><span class="nx">duration</span><span class="w"> </span><span class="o">&lt;</span><span class="w"> </span><span class="mf">500</span><span class="p">,</span>
</span><span id="__span-25-19"><a id="__codelineno-25-19" name="__codelineno-25-19" href="#__codelineno-25-19"></a><span class="w"> </span><span class="p">});</span>
</span><span id="__span-25-20"><a id="__codelineno-25-20" name="__codelineno-25-20" href="#__codelineno-25-20"></a><span class="p">}</span>
</span></code></pre></div></p>
<p><strong>Run test</strong>:
<div class="language-bash highlight"><pre><span></span><code><span id="__span-26-1"><a id="__codelineno-26-1" name="__codelineno-26-1" href="#__codelineno-26-1"></a>k6<span class="w"> </span>run<span class="w"> </span>load-test.js
</span></code></pre></div></p>
<hr />
<h3 id="prometheus-metrics">Prometheus Metrics<a class="headerlink" href="#prometheus-metrics" title="Permanent link">&para;</a></h3>
<p><strong>Monitor scaling indicators</strong>:
- <code>rate(http_requests_total[5m])</code> — Request rate
- <code>histogram_quantile(0.95, http_request_duration_seconds)</code> — P95 latency
- <code>container_cpu_usage_seconds_total</code> — CPU usage per container
- <code>container_memory_usage_bytes</code> — Memory usage per container</p>
<p><strong>Grafana alert</strong>:
<div class="language-yaml highlight"><pre><span></span><code><span id="__span-27-1"><a id="__codelineno-27-1" name="__codelineno-27-1" href="#__codelineno-27-1"></a><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">alert</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">HighAPILatency</span>
</span><span id="__span-27-2"><a id="__codelineno-27-2" name="__codelineno-27-2" href="#__codelineno-27-2"></a><span class="w"> </span><span class="nt">expr</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">histogram_quantile(0.95, rate(http_request_duration_seconds_bucket[5m])) &gt; 0.5</span>
</span><span id="__span-27-3"><a id="__codelineno-27-3" name="__codelineno-27-3" href="#__codelineno-27-3"></a><span class="w"> </span><span class="nt">for</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">5m</span>
</span><span id="__span-27-4"><a id="__codelineno-27-4" name="__codelineno-27-4" href="#__codelineno-27-4"></a><span class="w"> </span><span class="nt">labels</span><span class="p">:</span>
</span><span id="__span-27-5"><a id="__codelineno-27-5" name="__codelineno-27-5" href="#__codelineno-27-5"></a><span class="w"> </span><span class="nt">severity</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">warning</span>
</span><span id="__span-27-6"><a id="__codelineno-27-6" name="__codelineno-27-6" href="#__codelineno-27-6"></a><span class="w"> </span><span class="nt">annotations</span><span class="p">:</span>
</span><span id="__span-27-7"><a id="__codelineno-27-7" name="__codelineno-27-7" href="#__codelineno-27-7"></a><span class="w"> </span><span class="nt">summary</span><span class="p">:</span><span class="w"> </span><span class="s">&quot;P95</span><span class="nv"> </span><span class="s">latency</span><span class="nv"> </span><span class="s">&gt;500ms,</span><span class="nv"> </span><span class="s">consider</span><span class="nv"> </span><span class="s">scaling&quot;</span>
</span></code></pre></div></p>
<hr />
<h2 id="troubleshooting">Troubleshooting<a class="headerlink" href="#troubleshooting" title="Permanent link">&para;</a></h2>
<h3 id="high-cpu-usage">High CPU Usage<a class="headerlink" href="#high-cpu-usage" title="Permanent link">&para;</a></h3>
<p><strong>Diagnosis</strong>:
<div class="language-bash highlight"><pre><span></span><code><span id="__span-28-1"><a id="__codelineno-28-1" name="__codelineno-28-1" href="#__codelineno-28-1"></a><span class="c1"># Top processes</span>
</span><span id="__span-28-2"><a id="__codelineno-28-2" name="__codelineno-28-2" href="#__codelineno-28-2"></a>docker<span class="w"> </span>stats
</span><span id="__span-28-3"><a id="__codelineno-28-3" name="__codelineno-28-3" href="#__codelineno-28-3"></a>
</span><span id="__span-28-4"><a id="__codelineno-28-4" name="__codelineno-28-4" href="#__codelineno-28-4"></a><span class="c1"># API CPU usage</span>
</span><span id="__span-28-5"><a id="__codelineno-28-5" name="__codelineno-28-5" href="#__codelineno-28-5"></a>docker<span class="w"> </span>stats<span class="w"> </span>changemaker-v2-api
</span><span id="__span-28-6"><a id="__codelineno-28-6" name="__codelineno-28-6" href="#__codelineno-28-6"></a>
</span><span id="__span-28-7"><a id="__codelineno-28-7" name="__codelineno-28-7" href="#__codelineno-28-7"></a><span class="c1"># Profile Node.js</span>
</span><span id="__span-28-8"><a id="__codelineno-28-8" name="__codelineno-28-8" href="#__codelineno-28-8"></a>docker<span class="w"> </span>compose<span class="w"> </span><span class="nb">exec</span><span class="w"> </span>api<span class="w"> </span>node<span class="w"> </span>--prof<span class="w"> </span>dist/server.js
</span></code></pre></div></p>
<p><strong>Solutions</strong>:
- Scale API containers (3-5 replicas)
- Increase CPU limit (2-4 cores)
- Optimize slow queries (add indexes)
- Enable caching (Nginx proxy cache)</p>
<hr />
<h3 id="memory-leaks">Memory Leaks<a class="headerlink" href="#memory-leaks" title="Permanent link">&para;</a></h3>
<p><strong>Diagnosis</strong>:
<div class="language-bash highlight"><pre><span></span><code><span id="__span-29-1"><a id="__codelineno-29-1" name="__codelineno-29-1" href="#__codelineno-29-1"></a><span class="c1"># Memory usage over time</span>
</span><span id="__span-29-2"><a id="__codelineno-29-2" name="__codelineno-29-2" href="#__codelineno-29-2"></a>docker<span class="w"> </span>stats<span class="w"> </span>--no-stream<span class="w"> </span>changemaker-v2-api
</span><span id="__span-29-3"><a id="__codelineno-29-3" name="__codelineno-29-3" href="#__codelineno-29-3"></a>
</span><span id="__span-29-4"><a id="__codelineno-29-4" name="__codelineno-29-4" href="#__codelineno-29-4"></a><span class="c1"># Heap snapshot (Node.js)</span>
</span><span id="__span-29-5"><a id="__codelineno-29-5" name="__codelineno-29-5" href="#__codelineno-29-5"></a>docker<span class="w"> </span>compose<span class="w"> </span><span class="nb">exec</span><span class="w"> </span>api<span class="w"> </span>node<span class="w"> </span>--inspect<span class="w"> </span>dist/server.js
</span><span id="__span-29-6"><a id="__codelineno-29-6" name="__codelineno-29-6" href="#__codelineno-29-6"></a><span class="c1"># Chrome DevTools → Memory → Take snapshot</span>
</span></code></pre></div></p>
<p><strong>Solutions</strong>:
- Restart containers daily (cron job)
- Increase memory limit (4-8GB)
- Fix code leaks (event listeners, circular refs)</p>
<hr />
<h3 id="database-connection-exhaustion">Database Connection Exhaustion<a class="headerlink" href="#database-connection-exhaustion" title="Permanent link">&para;</a></h3>
<p><strong>Symptoms</strong>: <code>Error: too many connections for role "changemaker"</code></p>
<p><strong>Diagnosis</strong>:
<div class="language-bash highlight"><pre><span></span><code><span id="__span-30-1"><a id="__codelineno-30-1" name="__codelineno-30-1" href="#__codelineno-30-1"></a><span class="c1"># Check connection count</span>
</span><span id="__span-30-2"><a id="__codelineno-30-2" name="__codelineno-30-2" href="#__codelineno-30-2"></a>docker<span class="w"> </span>compose<span class="w"> </span><span class="nb">exec</span><span class="w"> </span>v2-postgres<span class="w"> </span>psql<span class="w"> </span>-U<span class="w"> </span>changemaker<span class="w"> </span>-c<span class="w"> </span><span class="se">\</span>
</span><span id="__span-30-3"><a id="__codelineno-30-3" name="__codelineno-30-3" href="#__codelineno-30-3"></a><span class="w"> </span><span class="s2">&quot;SELECT COUNT(*) FROM pg_stat_activity WHERE usename=&#39;changemaker&#39;&quot;</span>
</span><span id="__span-30-4"><a id="__codelineno-30-4" name="__codelineno-30-4" href="#__codelineno-30-4"></a>
</span><span id="__span-30-5"><a id="__codelineno-30-5" name="__codelineno-30-5" href="#__codelineno-30-5"></a><span class="c1"># Check max connections</span>
</span><span id="__span-30-6"><a id="__codelineno-30-6" name="__codelineno-30-6" href="#__codelineno-30-6"></a>docker<span class="w"> </span>compose<span class="w"> </span><span class="nb">exec</span><span class="w"> </span>v2-postgres<span class="w"> </span>psql<span class="w"> </span>-U<span class="w"> </span>changemaker<span class="w"> </span>-c<span class="w"> </span><span class="se">\</span>
</span><span id="__span-30-7"><a id="__codelineno-30-7" name="__codelineno-30-7" href="#__codelineno-30-7"></a><span class="w"> </span><span class="s2">&quot;SHOW max_connections&quot;</span>
</span></code></pre></div></p>
<p><strong>Solutions</strong>:
- Add PgBouncer (connection pooling)
- Increase <code>max_connections</code> (PostgreSQL config)
- Fix connection leaks (always close Prisma clients)</p>
<hr />
<h2 id="cost-optimization">Cost Optimization<a class="headerlink" href="#cost-optimization" title="Permanent link">&para;</a></h2>
<h3 id="resource-allocation">Resource Allocation<a class="headerlink" href="#resource-allocation" title="Permanent link">&para;</a></h3>
<p><strong>Right-sizing</strong> (don't over-provision):
- Start with 1 CPU, 1GB RAM per container
- Monitor actual usage (Prometheus)
- Scale based on metrics (not guesses)</p>
<p><strong>Example</strong> (production workload):
- API: 2 CPUs, 2GB RAM (3 replicas)
- PostgreSQL: 2 CPUs, 4GB RAM
- Redis: 1 CPU, 512MB RAM
- Media API: 2 CPUs, 2GB RAM (2 replicas)</p>
<hr />
<h3 id="autoscaling-docker-swarm">Autoscaling (Docker Swarm)<a class="headerlink" href="#autoscaling-docker-swarm" title="Permanent link">&para;</a></h3>
<p><strong>Docker Swarm mode</strong> (alternative to Compose):
<div class="language-bash highlight"><pre><span></span><code><span id="__span-31-1"><a id="__codelineno-31-1" name="__codelineno-31-1" href="#__codelineno-31-1"></a><span class="c1"># Initialize swarm</span>
</span><span id="__span-31-2"><a id="__codelineno-31-2" name="__codelineno-31-2" href="#__codelineno-31-2"></a>docker<span class="w"> </span>swarm<span class="w"> </span>init
</span><span id="__span-31-3"><a id="__codelineno-31-3" name="__codelineno-31-3" href="#__codelineno-31-3"></a>
</span><span id="__span-31-4"><a id="__codelineno-31-4" name="__codelineno-31-4" href="#__codelineno-31-4"></a><span class="c1"># Deploy stack</span>
</span><span id="__span-31-5"><a id="__codelineno-31-5" name="__codelineno-31-5" href="#__codelineno-31-5"></a>docker<span class="w"> </span>stack<span class="w"> </span>deploy<span class="w"> </span>-c<span class="w"> </span>docker-compose.yml<span class="w"> </span>changemaker
</span><span id="__span-31-6"><a id="__codelineno-31-6" name="__codelineno-31-6" href="#__codelineno-31-6"></a>
</span><span id="__span-31-7"><a id="__codelineno-31-7" name="__codelineno-31-7" href="#__codelineno-31-7"></a><span class="c1"># Autoscale API</span>
</span><span id="__span-31-8"><a id="__codelineno-31-8" name="__codelineno-31-8" href="#__codelineno-31-8"></a>docker<span class="w"> </span>service<span class="w"> </span>scale<span class="w"> </span><span class="nv">changemaker_api</span><span class="o">=</span><span class="m">3</span>
</span><span id="__span-31-9"><a id="__codelineno-31-9" name="__codelineno-31-9" href="#__codelineno-31-9"></a>
</span><span id="__span-31-10"><a id="__codelineno-31-10" name="__codelineno-31-10" href="#__codelineno-31-10"></a><span class="c1"># Update with zero downtime</span>
</span><span id="__span-31-11"><a id="__codelineno-31-11" name="__codelineno-31-11" href="#__codelineno-31-11"></a>docker<span class="w"> </span>service<span class="w"> </span>update<span class="w"> </span>--image<span class="w"> </span>api:v2.1<span class="w"> </span>changemaker_api
</span></code></pre></div></p>
<p><strong>Autoscaling</strong>:
<div class="language-yaml highlight"><pre><span></span><code><span id="__span-32-1"><a id="__codelineno-32-1" name="__codelineno-32-1" href="#__codelineno-32-1"></a><span class="nt">api</span><span class="p">:</span>
</span><span id="__span-32-2"><a id="__codelineno-32-2" name="__codelineno-32-2" href="#__codelineno-32-2"></a><span class="w"> </span><span class="nt">deploy</span><span class="p">:</span>
</span><span id="__span-32-3"><a id="__codelineno-32-3" name="__codelineno-32-3" href="#__codelineno-32-3"></a><span class="w"> </span><span class="nt">replicas</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">3</span>
</span><span id="__span-32-4"><a id="__codelineno-32-4" name="__codelineno-32-4" href="#__codelineno-32-4"></a><span class="w"> </span><span class="nt">update_config</span><span class="p">:</span>
</span><span id="__span-32-5"><a id="__codelineno-32-5" name="__codelineno-32-5" href="#__codelineno-32-5"></a><span class="w"> </span><span class="nt">parallelism</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">1</span>
</span><span id="__span-32-6"><a id="__codelineno-32-6" name="__codelineno-32-6" href="#__codelineno-32-6"></a><span class="w"> </span><span class="nt">delay</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">10s</span>
</span><span id="__span-32-7"><a id="__codelineno-32-7" name="__codelineno-32-7" href="#__codelineno-32-7"></a><span class="w"> </span><span class="nt">restart_policy</span><span class="p">:</span>
</span><span id="__span-32-8"><a id="__codelineno-32-8" name="__codelineno-32-8" href="#__codelineno-32-8"></a><span class="w"> </span><span class="nt">condition</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">on-failure</span>
</span></code></pre></div></p>
<hr />
<h2 id="related-documentation">Related Documentation<a class="headerlink" href="#related-documentation" title="Permanent link">&para;</a></h2>
<ul>
<li><strong><a href="../docker-compose/">Docker Compose</a></strong> — Container orchestration</li>
<li><strong><a href="../monitoring-stack/">Monitoring Stack</a></strong> — Performance metrics</li>
<li><strong><a href="../nginx/">Nginx Configuration</a></strong> — Load balancing</li>
<li><strong><a href="../backup-restore/">Backup &amp; Restore</a></strong> — Data protection at scale</li>
</ul>
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