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Credential helpers
|
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<a href="https://github.com/containrrr/watchtower/edit/master/docs/credential-helpers.md" title="Edit this page" class="md-icon md-content__icon"></a>
|
||||
|
||||
|
||||
<h1>Credential helpers</h1>
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||||
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||||
<p>Some private docker registries (the most prominent probably being AWS ECR) use non-standard ways of authentication.
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To be able to use this together with watchtower, we need to use a credential helper.</p>
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<p>To keep the image size small we've decided to not include any helpers in the watchtower image, instead we'll put the
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helper in a separate container and mount it using volumes.</p>
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<h3 id="example">Example<a class="headerlink" href="#example" title="Permanent link">¶</a></h3>
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||||
<p>Example implementation for use with <a href="https://github.com/awslabs/amazon-ecr-credential-helper">amazon-ecr-credential-helper</a>:</p>
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||||
<pre><code class="Dockerfile">FROM golang:latest
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||||
ENV CGO_ENABLED 0
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ENV REPO github.com/awslabs/amazon-ecr-credential-helper/ecr-login/cli/docker-credential-ecr-login
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||||
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||||
RUN go get -u $REPO
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||||
|
||||
RUN rm /go/bin/docker-credential-ecr-login
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||||
|
||||
RUN go build \
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||||
-o /go/bin/docker-credential-ecr-login \
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/go/src/$REPO
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||||
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||||
WORKDIR /go/bin/
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</code></pre>
|
||||
|
||||
<p>and the docker-compose definition:</p>
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||||
<pre><code class="yaml">version: "3"
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||||
|
||||
services:
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||||
watchtower:
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||||
image: index.docker.io/containrrr/watchtower:latest
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||||
volumes:
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||||
- /var/run/docker.sock:/var/run/docker.sock
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||||
- <PATH_TO_HOME_DIR>/.docker/config.json:/config.json
|
||||
- helper:/go/bin
|
||||
environment:
|
||||
- HOME=/
|
||||
- PATH=$PATH:/go/bin
|
||||
- AWS_REGION=<AWS_REGION>
|
||||
- AWS_ACCESS_KEY_ID=<AWS_ACCESS_KEY>
|
||||
- AWS_SECRET_ACCESS_KEY=<AWS_SECRET_ACCESS_KEY>
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||||
volumes:
|
||||
helper: {}
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||||
</code></pre>
|
||||
|
||||
<p>and for <code>.docker/config.yml</code>:</p>
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||||
<pre><code class="yaml"> {
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||||
"HttpHeaders" : {
|
||||
"User-Agent" : "Docker-Client/19.03.1 (XXXXXX)"
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||||
},
|
||||
"credsStore" : "osxkeychain", // ...or your prefered helper
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||||
"auths" : {
|
||||
"xyzxyzxyz.dkr.ecr.eu-north-1.amazonaws.com" : {},
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||||
"https://index.docker.io/v1/": {}
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},
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"credHelpers": {
|
||||
"xyzxyzxyz.dkr.ecr.eu-north-1.amazonaws.com" : "ecr-login",
|
||||
"index.docker.io": "osxkeychain" // ...or your prefered helper
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||||
}
|
||||
}
|
||||
</code></pre>
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
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<a href="https://github.com/containrrr/watchtower/edit/master/docs/lifecycle-hooks.md" title="Edit this page" class="md-icon md-content__icon"></a>
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<h1>Lifecycle hooks</h1>
|
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|
||||
<h2 id="executing_commands_before_and_after_updating">Executing commands before and after updating<a class="headerlink" href="#executing_commands_before_and_after_updating" title="Permanent link">¶</a></h2>
|
||||
<blockquote>
|
||||
<p><strong>DO NOTE</strong>: Both commands are shell commands executed with <code>sh</code>, and therefore require the
|
||||
container to provide the <code>sh</code> executable.</p>
|
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</blockquote>
|
||||
<p>It is possible to execute a <em>pre-update</em> command and a <em>post-update</em> command
|
||||
<strong>inside</strong> every container updated by watchtower. The <em>pre-update</em> command is
|
||||
executed before stopping the container, and the <em>post-update</em> command is
|
||||
executed after restarting the container.</p>
|
||||
<p>This feature is disabled by default. To enable it, you need to set the option
|
||||
<code>--enable-lifecycle-hooks</code> on the command line, or set the environment variable
|
||||
<code>WATCHTOWER_LIFECYCLE_HOOKS</code> to <code>true</code>.</p>
|
||||
<h3 id="specifying_update_commands">Specifying update commands<a class="headerlink" href="#specifying_update_commands" title="Permanent link">¶</a></h3>
|
||||
<p>The commands are specified using docker container labels, with
|
||||
<code>com.centurylinklabs.watchtower.lifecycle.pre-update-command</code> for the <em>pre-update</em>
|
||||
command and <code>com.centurylinklabs.watchtower.lifecycle.post-update</code> for the
|
||||
<em>post-update</em> command.</p>
|
||||
<p>These labels can be declared as instructions in a Dockerfile:</p>
|
||||
<pre><code class="docker">LABEL com.centurylinklabs.watchtower.lifecycle.pre-update="/dump-data.sh"
|
||||
LABEL com.centurylinklabs.watchtower.lifecycle.post-update="/restore-data.sh"
|
||||
</code></pre>
|
||||
|
||||
<p>Or be specified as part of the <code>docker run</code> command line:</p>
|
||||
<pre><code class="bash">docker run -d \
|
||||
--label=com.centurylinklabs.watchtower.lifecycle.pre-update="/dump-data.sh" \
|
||||
--label=com.centurylinklabs.watchtower.lifecycle.post-update="/restore-data.sh" \
|
||||
someimage
|
||||
</code></pre>
|
||||
|
||||
<h3 id="execution_failure">Execution failure<a class="headerlink" href="#execution_failure" title="Permanent link">¶</a></h3>
|
||||
<p>The failure of a command to execute, identified by an exit code different than
|
||||
0, will not prevent watchtower from updating the container. Only an error
|
||||
log statement containing the exit code will be reported.</p>
|
||||
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|
||||
<div class="md-footer-meta md-typeset">
|
||||
<div class="md-footer-meta__inner md-grid">
|
||||
<div class="md-footer-copyright">
|
||||
|
||||
powered by
|
||||
<a href="https://www.mkdocs.org">MkDocs</a>
|
||||
and
|
||||
<a href="https://squidfunk.github.io/mkdocs-material/">
|
||||
Material for MkDocs</a>
|
||||
</div>
|
||||
|
||||
</div>
|
||||
</div>
|
||||
</footer>
|
||||
|
||||
</div>
|
||||
|
||||
<script src="../assets/javascripts/application.c648116f.js"></script>
|
||||
|
||||
<script>app.initialize({version:"1.0.4",url:{base:".."}})</script>
|
||||
|
||||
|
||||
</body>
|
||||
</html>
|
||||
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Reference in New Issue