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<h1 id="multiple-targets-per-hostname">Multiple Targets per hostname<a class="headerlink" href="#multiple-targets-per-hostname" title="Permanent link">&para;</a></h1>
<p><em>(November 2017)</em></p>
<h2 id="purpose">Purpose<a class="headerlink" href="#purpose" title="Permanent link">&para;</a></h2>
<p>One should be able to define multiple targets (IPs/Hostnames) in the <strong>same</strong> Kubernetes resource object and expect<br />
ExternalDNS create DNS record(s) with a specified hostname and all targets. So far the connection between k8s resources (ingress/services) and DNS records<br />
were not streamlined. This proposal aims to make the connection explicit, making k8s resources acquire or release certain DNS names. As long as the resource<br />
ingress/service owns the record it can have multiple targets enable iff they are specified in the same resource.</p>
<h2 id="use-cases">Use cases<a class="headerlink" href="#use-cases" title="Permanent link">&para;</a></h2>
<p>See https://github.com/kubernetes-sigs/external-dns/issues/239</p>
<h2 id="current-behaviour">Current behaviour<a class="headerlink" href="#current-behaviour" title="Permanent link">&para;</a></h2>
<p><em>(as of the moment of writing)</em></p>
<p>Central piece of enabling multi-target is having consistent and correct behaviour in <code>plan</code> component in regards to how endpoints generated<br />
from kubernetes resources are mapped to dns records. Current implementation of the <code>plan</code> has inconsistent behaviour in the following scenarios, all<br />
of which must be resolved before multi-target support can be enabled in the provider implementations:</p>
<ol>
<li>
<p>No records registered so far. Two <strong>different</strong> ingresses request same hostname but different targets, e.g. Ingress A: example.com -&gt; 1.1.1.1 and Ingress B: example.com -&gt; 2.2.2.2</p>
<ul>
<li><em>Current Behaviour</em>: both are added to the &ldquo;Create&rdquo; (records to be created) list and passed to Provider</li>
<li><em>Expected Behaviour</em>: only one (random/ or according to predefined strategy) should be chosen and passed to Provider</li>
</ul>
<p><strong>NOTE</strong>: while this seems to go against multi-target support, this is done so no other resource can &ldquo;hijack&rdquo; already created DNS record. Multi targets are supported only<br />
on per single resource basis</p>
</li>
<li>
<p>Now let&rsquo;s say Ingress A was chosen and successfully created, but both ingress A and B are still there. So on next iteration ExternalDNS would see both again in the Desired list.</p>
<ul>
<li><em>Current Behaviour</em>: DNS record target will change to that of Ingress B.</li>
<li><em>Expected Behaviour</em>: Ingress A should stay unchanged. Ingress B record is not created</li>
</ul>
</li>
<li>
<p>DNS record for Ingress A was created but its target has changed. Ingress B is still there</p>
<ul>
<li><em>Current Behaviour</em>: Undetermined behaviour based on which ingress will be parsed last.</li>
<li><em>Expected Behaviour</em>: DNS record should point to the new target specified in A. Ingress B should still be ignored.</li>
</ul>
<p><strong>NOTE</strong>: both 2. and 3. can be resolved if External DNS is aware which resource has already acquired DNS record</p>
</li>
<li>
<p>Ingress C has multiple targets: 1.1.1.1 and 2.2.2.2</p>
<ul>
<li><em>Current Behaviour</em>: Both targets are split into different endpoints and we end up in one of the cases above</li>
<li><em>Expected Behaviour</em>: Endpoint should contain list of targets and treated as one ingress object.</li>
</ul>
</li>
</ol>
<h2 id="requirements-and-assumptions">Requirements and assumptions<a class="headerlink" href="#requirements-and-assumptions" title="Permanent link">&para;</a></h2>
<p>For this feature to work we have to make sure that:</p>
<ol>
<li>DNS records are now owned by certain ingress/service resources. For External DNS it would mean that TXT records now<br />
should store back-reference for the resource this record was created for, i.e. <code>"heritage=external-dns,external-dns/resource=ingress/default/my-ingress-object-name"</code></li>
<li>
<p>DNS records are updated only:</p>
<ul>
<li>
<p>If owning resource target list has changed</p>
</li>
<li>
<p>If owning resource record is not found in the desired list (meaning it was deleted), therefore it will now be owned by another record. So its target list will be updated</p>
</li>
<li>
<p>Changes related to other record properties (e.g. TTL)</p>
</li>
</ul>
</li>
<li>
<p>All of the issues described in <code>Current Behaviour</code> sections are resolved</p>
</li>
</ol>
<p>Once Create/Update/Delete lists are calculated correctly (this is where conflicts based on requested DNS names are resolved) they are passed to <code>provider</code>, where<br />
<code>provider</code> specific implementation will decide how to convert the structures into required formats. If DNS provider does not (or partially) support multi targets<br />
then it is up to the provider to make sure that the change list of records passed to the DNS provider API is valid. <strong>TODO</strong>: explain best strategy.</p>
<p>Additionally see https://github.com/kubernetes-sigs/external-dns/issues/258</p>
<h2 id="implementation-plan">Implementation plan<a class="headerlink" href="#implementation-plan" title="Permanent link">&para;</a></h2>
<p>Brief summary of open PRs and what they are trying to address:</p>
<h3 id="prs">PRs<a class="headerlink" href="#prs" title="Permanent link">&para;</a></h3>
<ol>
<li>
<p>https://github.com/kubernetes-sigs/external-dns/pull/243 - first attempt to add support for multiple targets. It is lagging far behind from tip</p>
<p><em>what it does</em>: unfinished attempt to extend <code>Endpoint</code> struct, for it to allow multiple targets (essentially <code>target string -&gt; targets []string</code>)</p>
<p><em>action</em>: evaluate if rebasing makes sense, or we can just close it.</p>
</li>
<li>
<p>https://github.com/kubernetes-sigs/external-dns/pull/261 - attempt to rework <code>plan</code> to make it work correctly with multiple targets.</p>
<p><em>what it does</em> : attempts to fix issues with <code>plan</code> described in <code>Current Behaviour</code> section above. Included tests reveal the current problem with <code>plan</code></p>
<p><em>action</em>: rebase on default branch and make necessary changes to satisfy requirements listed in this document including back-reference to owning record</p>
</li>
<li>
<p>https://github.com/kubernetes-sigs/external-dns/pull/326 - attempt to add multiple target support.</p>
<p><em>what it does</em>: for each pair <code>DNS Name</code> + <code>Record Type</code> it aggregates <strong>all</strong> targets from the cluster and passes them to Provider. It adds basic support</p>
<p><em>action</em>: the <code>plan</code> logic will probably needs to be reworked, however the rest concerning support in Providers and extending <code>Endpoint</code> struct can be reused.<br />
Rebase on default branch and add missing pieces. Depends on <code>2</code>.</p>
</li>
</ol>
<p>Related PRs: https://github.com/kubernetes-sigs/external-dns/pull/331/files, https://github.com/kubernetes-sigs/external-dns/pull/347/files - aiming at AWS Route53 weighted records.<br />
These PRs should be considered after common agreement about the way to address multi-target support is achieved. Related discussion: https://github.com/kubernetes-sigs/external-dns/issues/196</p>
<h3 id="how-to-proceed-from-here">How to proceed from here<a class="headerlink" href="#how-to-proceed-from-here" title="Permanent link">&para;</a></h3>
<p>The following steps are needed:</p>
<ol>
<li>Make sure consensus regarding the approach is achieved via collaboration on the current document</li>
<li>Notify all PR (see above) authors about the agreed approach</li>
<li>
<p>Implementation:</p>
<p>a. <code>Plan</code> is working as expected - either based on #261 above or from scratch. <code>Plan</code> should be working correctly regardless of multi-target support</p>
<p>b. Extensive testing making sure new <code>plan</code> does not introduce any breaking changes</p>
<p>c. Change Endpoint struct to support multiple targets - based on #326 - integrate it with new <code>plan</code> @sethpollack</p>
<p>d. Make sure new endpoint format can still be used in providers which have only partial support for multi targets <del><strong>TODO</strong>: how ?</del> . This is to be done by simply using first target in the targets list.</p>
<p>e. Add support for multi target which are already addressed in #326. It goes alongside c. and can be based on the same PR @sethpollack. New providers<br />
added since then should maintain same functionality.</p>
</li>
<li>
<p>Extensive testing on <strong>all</strong> providers before making new release</p>
</li>
<li>Update all related documentation and explain how multi targets are supported on per provider basis</li>
<li>Think of introducing weighted records (see PRs section above) and making them configurable.</li>
</ol>
<h2 id="open-questions">Open questions<a class="headerlink" href="#open-questions" title="Permanent link">&para;</a></h2>
<ul>
<li>Handling cases when ingress/service targets include both hostnames and IPs - postpone this until use cases occurs</li>
<li>&ldquo;Weighted records scope&rdquo;: https://github.com/kubernetes-sigs/external-dns/issues/196 - this should be considered once multi-target support is implemented</li>
</ul>
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