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<h1 id="google-cloud">Google Cloud<a class="headerlink" href="#google-cloud" title="Permanent link">&para;</a></h1>
<h2 id="load-balancing">Load Balancing<a class="headerlink" href="#load-balancing" title="Permanent link">&para;</a></h2>
<p><img alt="Load Balancing" src="/img/typhoon-gcp-load-balancing.png" /></p>
<h3 id="kube-apiserver">kube-apiserver<a class="headerlink" href="#kube-apiserver" title="Permanent link">&para;</a></h3>
<p>A global forwarding rule (IPv4 anycast) and TCP Proxy distribute IPv4 TCP/443 traffic across a backend service with zonal instance groups of controller(s) with a healthy <code>kube-apiserver</code> (TCP/6443). Clusters with multiple controllers span zones in a region to tolerate zone outages.</p>
<p>Notes:</p>
<ul>
<li>GCP TCP Proxy limits external port options (e.g. must use 443, not 6443)</li>
<li>A regional NLB cannot be used for multi-controller (see <a href="https://github.com/poseidon/typhoon/pull/190">#190</a>)</li>
</ul>
<h3 id="httphttp-ingress">HTTP/HTTP Ingress<a class="headerlink" href="#httphttp-ingress" title="Permanent link">&para;</a></h3>
<p>Global forwarding rules and a TCP Proxy distribute IPv4/IPv6 TCP/80 and TCP/443 traffic across a managed instance group of workers with a healthy Ingress Controller. Workers span zones in a region to tolerate zone outages.</p>
<p>The IPv4 and IPv6 anycast addresses are output as <code>ingress_static_ipv4</code> and <code>ingress_static_ipv6</code> for use in DNS A and AAAA records. See <a href="/addons/ingress/#google-cloud">Ingress on Google Cloud</a>.</p>
<h3 id="tcpudp-services">TCP/UDP Services<a class="headerlink" href="#tcpudp-services" title="Permanent link">&para;</a></h3>
<p>Load balance TCP/UDP applications by adding a forwarding rule to the worker target pool (output).</p>
<div class="highlight"><pre><span></span><code><span class="c1"># Static IPv4 address for some-app Load Balancing</span>
<span class="kr">resource</span><span class="w"> </span><span class="nc">&quot;google_compute_address&quot;</span><span class="w"> </span><span class="nv">&quot;some-app-ipv4&quot;</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="na">name</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">&quot;some-app-ipv4&quot;</span>
<span class="p">}</span>
<span class="c1"># Forward IPv4 TCP traffic to the target pool</span>
<span class="kr">resource</span><span class="w"> </span><span class="nc">&quot;google_compute_forwarding_rule&quot;</span><span class="w"> </span><span class="nv">&quot;some-app-tcp&quot;</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="na">name</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">&quot;some-app-tcp&quot;</span>
<span class="w"> </span><span class="na">ip_address</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nv">google_compute_address.some-app-ipv4.address</span>
<span class="w"> </span><span class="na">ip_protocol</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">&quot;TCP&quot;</span>
<span class="w"> </span><span class="na">port_range</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">&quot;3333&quot;</span>
<span class="w"> </span><span class="na">target</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nv">module.yavin.worker_target_pool</span>
<span class="p">}</span>
<span class="c1"># Forward IPv4 UDP traffic to the target pool</span>
<span class="kr">resource</span><span class="w"> </span><span class="nc">&quot;google_compute_forwarding_rule&quot;</span><span class="w"> </span><span class="nv">&quot;some-app-udp&quot;</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="na">name</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">&quot;some-app-udp&quot;</span>
<span class="w"> </span><span class="na">ip_address</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nv">google_compute_address.some-app-ipv4.address</span>
<span class="w"> </span><span class="na">ip_protocol</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">&quot;UDP&quot;</span>
<span class="w"> </span><span class="na">port_range</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">&quot;3333&quot;</span>
<span class="w"> </span><span class="na">target</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nv">module.yavin.worker_target_pool</span>
<span class="p">}</span>
</code></pre></div>
<p>Notes:</p>
<ul>
<li>GCP Global Load Balancers aren't appropriate for custom TCP/UDP.<ul>
<li>Backend Services require a named port corresponding to an instance group (output by Typhoon) port. Typhoon shouldn't accept a list of every TCP/UDP service that may later be hosted on the cluster.</li>
<li>Backend Services don't support UDP (i.e. rules out global load balancers)</li>
</ul>
</li>
<li>IPv4 Only: Regional Load Balancers use a regional IPv4 address (e.g. <code>google_compute_address</code>), no IPv6.</li>
<li>Forward rules don't support differing external and internal ports. Some Ingress controllers (e.g. nginx) can proxy TCP/UDP traffic to achieve this.</li>
<li>Worker target pool health checks workers <code>HTTP:10254/healthz</code> (i.e. <code>nginx-ingress</code>)</li>
</ul>
<h2 id="firewalls">Firewalls<a class="headerlink" href="#firewalls" title="Permanent link">&para;</a></h2>
<p>Add firewall rules to the cluster's network.</p>
<div class="highlight"><pre><span></span><code><span class="kr">resource</span><span class="w"> </span><span class="nc">&quot;google_compute_firewall&quot;</span><span class="w"> </span><span class="nv">&quot;some-app&quot;</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="na">name</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">&quot;some-app&quot;</span>
<span class="w"> </span><span class="na">network</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nv">module.yavin.network_self_link</span>
<span class="w"> </span><span class="nb">allow</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="na">protocol</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">&quot;tcp&quot;</span>
<span class="w"> </span><span class="na">ports</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">[</span><span class="m">3333</span><span class="p">]</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="nb">allow</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="na">protocol</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">&quot;udp&quot;</span>
<span class="w"> </span><span class="na">ports</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">[</span><span class="m">3333</span><span class="p">]</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="na">source_ranges</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">[</span><span class="s2">&quot;0.0.0.0/0&quot;</span><span class="p">]</span>
<span class="w"> </span><span class="na">target_tags</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">[</span><span class="s2">&quot;yavin-worker&quot;</span><span class="p">]</span>
<span class="p">}</span>
</code></pre></div>
<h2 id="ipv6">IPv6<a class="headerlink" href="#ipv6" title="Permanent link">&para;</a></h2>
<p>Applications exposed via HTTP/HTTPS Ingress can be served over IPv6.</p>
<table>
<thead>
<tr>
<th>IPv6 Feature</th>
<th>Supported</th>
</tr>
</thead>
<tbody>
<tr>
<td>Node IPv6 address</td>
<td>No</td>
</tr>
<tr>
<td>Node Outbound IPv6</td>
<td>No</td>
</tr>
<tr>
<td>Kubernetes Ingress IPv6</td>
<td>Yes</td>
</tr>
</tbody>
</table>
</article>
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