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| <div class="section" id="production-guide"> |
| <h1>Production Guide<a class="headerlink" href="#production-guide" title="Permalink to this headline">¶</a></h1> |
| <p>The following are things to consider when using this Helm chart in a production environment.</p> |
| <div class="section" id="database"> |
| <h2>Database<a class="headerlink" href="#database" title="Permalink to this headline">¶</a></h2> |
| <p>It is advised to set up an external database for the Airflow metastore. The default Helm chart deploys a |
| Postgres database running in a container. For production usage, a database running on a dedicated machine or |
| leveraging a cloud provider’s database service such as AWS RDS is advised. Supported databases and versions |
| can be found at <a class="reference external" href="/docs/apache-airflow/stable/howto/set-up-database.html" title="(in apache-airflow v2.3.0.dev0)"><span class="xref std std-doc">Set up a Database Backend</span></a>.</p> |
| <p>First disable the Postgres in Docker container:</p> |
| <div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="nt">postgresql</span><span class="p">:</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">enabled</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">false</span><span class="w"></span> |
| </pre></div> |
| </div> |
| <p>To provide the database credentials to Airflow, store the credentials in a Kubernetes secret. Note that |
| special characters in the username/password must be URL encoded.</p> |
| <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>kubectl create secret generic mydatabase --from-literal<span class="o">=</span><span class="nv">connection</span><span class="o">=</span>postgresql://user:pass@host:5432/db |
| </pre></div> |
| </div> |
| <p>Helm defaults to fetching the value from a secret named <code class="docutils literal notranslate"><span class="pre">[RELEASE</span> <span class="pre">NAME]-airflow-metadata</span></code>, but you can |
| configure the secret name:</p> |
| <div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="nt">data</span><span class="p">:</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">metadataSecretName</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">mydatabase</span><span class="w"></span> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="pgbouncer"> |
| <span id="production-guide-pgbouncer"></span><h2>PgBouncer<a class="headerlink" href="#pgbouncer" title="Permalink to this headline">¶</a></h2> |
| <p>If you are using PostgreSQL as your database, you will likely want to enable <a class="reference external" href="https://www.pgbouncer.org/">PgBouncer</a> as well. |
| Airflow can open a lot of database connections due to its distributed nature and using a connection pooler can significantly |
| reduce the number of open connections on the database.</p> |
| <div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="nt">pgbouncer</span><span class="p">:</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">enabled</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">true</span><span class="w"></span> |
| </pre></div> |
| </div> |
| <p>Depending on the size of your Airflow instance, you may want to adjust the following as well (defaults are shown):</p> |
| <div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="nt">pgbouncer</span><span class="p">:</span><span class="w"></span> |
| <span class="w"> </span><span class="c1"># The maximum number of connections to PgBouncer</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">maxClientConn</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">100</span><span class="w"></span> |
| <span class="w"> </span><span class="c1"># The maximum number of server connections to the metadata database from PgBouncer</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">metadataPoolSize</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">10</span><span class="w"></span> |
| <span class="w"> </span><span class="c1"># The maximum number of server connections to the result backend database from PgBouncer</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">resultBackendPoolSize</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">5</span><span class="w"></span> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="webserver-secret-key"> |
| <h2>Webserver Secret Key<a class="headerlink" href="#webserver-secret-key" title="Permalink to this headline">¶</a></h2> |
| <p>You should set a static webserver secret key when deploying with this chart as it will help ensure |
| your Airflow components only restart when necessary.</p> |
| <div class="admonition warning"> |
| <p class="admonition-title">Warning</p> |
| <p>You should use a different secret key for every instance you run, as this key is used to sign |
| session cookies and perform other security related functions!</p> |
| </div> |
| <p>First, generate a strong secret key:</p> |
| <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>python3 -c <span class="s1">'import secrets; print(secrets.token_hex(16))'</span> |
| </pre></div> |
| </div> |
| <p>Now add the secret to your values file:</p> |
| <div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="nt">webserverSecretKey</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain"><secret_key></span><span class="w"></span> |
| </pre></div> |
| </div> |
| <p>Alternatively, create a Kubernetes Secret and use <code class="docutils literal notranslate"><span class="pre">webserverSecretKeySecretName</span></code>:</p> |
| <div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="nt">webserverSecretKeySecretName</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">my-webserver-secret</span><span class="w"></span> |
| <span class="c1"># where the random key is under `webserver-secret-key` in the k8s Secret</span><span class="w"></span> |
| </pre></div> |
| </div> |
| <p>Example to create a Kubernetes Secret from <code class="docutils literal notranslate"><span class="pre">kubectl</span></code>:</p> |
| <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>kubectl create secret generic my-webserver-secret --from-literal<span class="o">=</span><span class="s2">"webserver-secret-key=</span><span class="k">$(</span>python3 -c <span class="s1">'import secrets; print(secrets.token_hex(16))'</span><span class="k">)</span><span class="s2">"</span> |
| </pre></div> |
| </div> |
| <p>The webserver key is also used to authorize requests to Celery workers when logs are retrieved. The token |
| generated using the secret key has a short expiry time though - make sure that time on ALL the machines |
| that you run airflow components on is synchronized (for example using ntpd) otherwise you might get |
| “forbidden” errors when the logs are accessed.</p> |
| </div> |
| <div class="section" id="extending-and-customizing-airflow-image"> |
| <h2>Extending and customizing Airflow Image<a class="headerlink" href="#extending-and-customizing-airflow-image" title="Permalink to this headline">¶</a></h2> |
| <p>The Apache Airflow community, releases Docker Images which are <code class="docutils literal notranslate"><span class="pre">reference</span> <span class="pre">images</span></code> for Apache Airflow. |
| However, Airflow has more than 60 community managed providers (installable via extras) and some of the |
| default extras/providers installed are not used by everyone, sometimes others extras/providers |
| are needed, sometimes (very often actually) you need to add your own custom dependencies, |
| packages or even custom providers, or add custom tools and binaries that are needed in |
| your deployment.</p> |
| <p>In Kubernetes and Docker terms this means that you need another image with your specific requirements. |
| This is why you should learn how to build your own <code class="docutils literal notranslate"><span class="pre">Docker</span></code> (or more properly <code class="docutils literal notranslate"><span class="pre">Container</span></code>) image.</p> |
| <p>Typical scenarios where you would like to use your custom image:</p> |
| <ul class="simple"> |
| <li><p>Adding <code class="docutils literal notranslate"><span class="pre">apt</span></code> packages</p></li> |
| <li><p>Adding <code class="docutils literal notranslate"><span class="pre">PyPI</span></code> packages</p></li> |
| <li><p>Adding binary resources necessary for your deployment</p></li> |
| <li><p>Adding custom tools needed in your deployment</p></li> |
| </ul> |
| <p>See <a class="reference external" href="https://airflow.apache.org/docs/docker-stack/build.html">Building the image</a> for more |
| details on how you can extend and customize the Airflow image.</p> |
| </div> |
| <div class="section" id="managing-dag-files"> |
| <h2>Managing DAG Files<a class="headerlink" href="#managing-dag-files" title="Permalink to this headline">¶</a></h2> |
| <p>See <a class="reference internal" href="manage-dags-files.html"><span class="doc">Manage DAGs files</span></a>.</p> |
| <div class="section" id="knownhosts"> |
| <span id="production-guide-knownhosts"></span><h3>knownHosts<a class="headerlink" href="#knownhosts" title="Permalink to this headline">¶</a></h3> |
| <p>If you are using <code class="docutils literal notranslate"><span class="pre">dags.gitSync.sshKeySecret</span></code>, you should also set <code class="docutils literal notranslate"><span class="pre">dags.gitSync.knownHosts</span></code>. Here we will show the process |
| for GitHub, but the same can be done for any provider:</p> |
| <p>Grab GitHub’s public key:</p> |
| <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>ssh-keyscan -t rsa github.com > github_public_key |
| </pre></div> |
| </div> |
| <p>Next, print the fingerprint for the public key:</p> |
| <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>ssh-keygen -lf github_public_key |
| </pre></div> |
| </div> |
| <p>Compare that output with <a class="reference external" href="https://docs.github.com/en/github/authenticating-to-github/githubs-ssh-key-fingerprints">GitHub’s SSH key fingerprints</a>.</p> |
| <p>They match, right? Good. Now, add the public key to your values. It’ll look something like this:</p> |
| <div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="nt">dags</span><span class="p">:</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">gitSync</span><span class="p">:</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">knownHosts</span><span class="p">:</span><span class="w"> </span><span class="p p-Indicator">|</span><span class="w"></span> |
| <span class="w"> </span><span class="no">github.com ssh-rsa AAAA...FAaQ==</span><span class="w"></span> |
| </pre></div> |
| </div> |
| </div> |
| </div> |
| <div class="section" id="accessing-the-airflow-ui"> |
| <h2>Accessing the Airflow UI<a class="headerlink" href="#accessing-the-airflow-ui" title="Permalink to this headline">¶</a></h2> |
| <p>How you access the Airflow UI will depend on your environment, however the chart does support various options:</p> |
| <div class="section" id="ingress"> |
| <h3>Ingress<a class="headerlink" href="#ingress" title="Permalink to this headline">¶</a></h3> |
| <p>You can create and configure <code class="docutils literal notranslate"><span class="pre">Ingress</span></code> objects. See the <a class="reference internal" href="parameters-ref.html#parameters-ingress"><span class="std std-ref">Ingress chart parameters</span></a>. |
| For more information on <code class="docutils literal notranslate"><span class="pre">Ingress</span></code>, see the |
| <a class="reference external" href="https://kubernetes.io/docs/concepts/services-networking/ingress/">Kubernetes Ingress documentation</a>.</p> |
| </div> |
| <div class="section" id="loadbalancer-service"> |
| <h3>LoadBalancer Service<a class="headerlink" href="#loadbalancer-service" title="Permalink to this headline">¶</a></h3> |
| <p>You can change the Service type for the webserver to be <code class="docutils literal notranslate"><span class="pre">LoadBalancer</span></code>, and set any necessary annotations:</p> |
| <div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="nt">webserver</span><span class="p">:</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">service</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">LoadBalancer</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">annotations</span><span class="p">:</span><span class="w"> </span><span class="p p-Indicator">{}</span><span class="w"></span> |
| </pre></div> |
| </div> |
| <p>For more information on <code class="docutils literal notranslate"><span class="pre">LoadBalancer</span></code> Services, see the <a class="reference external" href="https://kubernetes.io/docs/concepts/services-networking/service/#loadbalancer">Kubernetes LoadBalancer Service Documentation</a>.</p> |
| </div> |
| </div> |
| <div class="section" id="logging"> |
| <h2>Logging<a class="headerlink" href="#logging" title="Permalink to this headline">¶</a></h2> |
| <p>Depending on your choice of executor, task logs may not work out of the box. All logging choices can be found |
| at <a class="reference internal" href="manage-logs.html"><span class="doc">Manage logs</span></a>.</p> |
| </div> |
| <div class="section" id="metrics"> |
| <h2>Metrics<a class="headerlink" href="#metrics" title="Permalink to this headline">¶</a></h2> |
| <p>The chart can support sending metrics to an existing StatsD instance or provide a Prometheus endpoint.</p> |
| <div class="section" id="prometheus"> |
| <h3>Prometheus<a class="headerlink" href="#prometheus" title="Permalink to this headline">¶</a></h3> |
| <p>The metrics endpoint is available at <code class="docutils literal notranslate"><span class="pre">svc/{{</span> <span class="pre">.Release.Name</span> <span class="pre">}}-statsd:9102/metrics</span></code>.</p> |
| </div> |
| <div class="section" id="external-statsd"> |
| <h3>External StatsD<a class="headerlink" href="#external-statsd" title="Permalink to this headline">¶</a></h3> |
| <p>To use an external StatsD instance:</p> |
| <div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="nt">statsd</span><span class="p">:</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">enabled</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">false</span><span class="w"></span> |
| <span class="nt">config</span><span class="p">:</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">metrics</span><span class="p">:</span><span class="w"> </span><span class="c1"># or 'scheduler' for Airflow 1</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">statsd_on</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">true</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">statsd_host</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">...</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">statsd_port</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">...</span><span class="w"></span> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="datadog"> |
| <h3>Datadog<a class="headerlink" href="#datadog" title="Permalink to this headline">¶</a></h3> |
| <p>If you are using a Datadog agent in your environment, this will enable Airflow to export metrics to the Datadog agent.</p> |
| <div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="nt">statsd</span><span class="p">:</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">enabled</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">false</span><span class="w"></span> |
| <span class="nt">config</span><span class="p">:</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">metrics</span><span class="p">:</span><span class="w"> </span><span class="c1"># or 'scheduler' for Airflow 1</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">statsd_on</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">true</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">statsd_port</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">8125</span><span class="w"></span> |
| <span class="nt">extraEnv</span><span class="p">:</span><span class="w"> </span><span class="p p-Indicator">|-</span><span class="w"></span> |
| <span class="w"> </span><span class="no">- name: AIRFLOW__METRICS__STATSD_HOST</span><span class="w"></span> |
| <span class="w"> </span><span class="no">valueFrom:</span><span class="w"></span> |
| <span class="w"> </span><span class="no">fieldRef:</span><span class="w"></span> |
| <span class="w"> </span><span class="no">fieldPath: status.hostIP</span><span class="w"></span> |
| </pre></div> |
| </div> |
| </div> |
| </div> |
| <div class="section" id="celery-backend"> |
| <h2>Celery Backend<a class="headerlink" href="#celery-backend" title="Permalink to this headline">¶</a></h2> |
| <p>If you are using <code class="docutils literal notranslate"><span class="pre">CeleryExecutor</span></code> or <code class="docutils literal notranslate"><span class="pre">CeleryKubernetesExecutor</span></code>, you can bring your own Celery backend.</p> |
| <p>By default, the chart will deploy Redis. However, you can use any supported Celery backend instead:</p> |
| <div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="nt">redis</span><span class="p">:</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">enabled</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">false</span><span class="w"></span> |
| <span class="nt">data</span><span class="p">:</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">brokerUrl</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">redis://redis-user:password@redis-host:6379/0</span><span class="w"></span> |
| </pre></div> |
| </div> |
| <p>For more information about setting up a Celery broker, refer to the |
| exhaustive <a class="reference external" href="http://docs.celeryproject.org/en/latest/getting-started/">Celery documentation on the topic</a>.</p> |
| </div> |
| <div class="section" id="security-context-constraints"> |
| <h2>Security Context Constraints<a class="headerlink" href="#security-context-constraints" title="Permalink to this headline">¶</a></h2> |
| <p>A <code class="docutils literal notranslate"><span class="pre">Security</span> <span class="pre">Context</span> <span class="pre">Constraint</span></code> (SCC) is a OpenShift construct that works as a RBAC rule however it targets Pods instead of users. |
| When defining a SCC, one can control actions and resources a POD can perform or access during startup and runtime.</p> |
| <p>The SCCs are split into different levels or categories with the <code class="docutils literal notranslate"><span class="pre">restricted</span></code> SCC being the default one assigned to Pods. |
| When deploying Airflow to OpenShift, one can leverage the SCCs and allow the Pods to start containers utilizing the <code class="docutils literal notranslate"><span class="pre">anyuid</span></code> SCC.</p> |
| <p>In order to enable the usage of SCCs, one must set the parameter <a class="reference internal" href="parameters-ref.html#parameters-kubernetes"><span class="std std-ref">rbac.createSCCRoleBinding</span></a> to <code class="docutils literal notranslate"><span class="pre">true</span></code> as shown below:</p> |
| <div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="nt">rbac</span><span class="p">:</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">create</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">true</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">createSCCRoleBinding</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">true</span><span class="w"></span> |
| </pre></div> |
| </div> |
| <p>In this chart, SCCs are bound to the Pods via RoleBindings meaning that the option <code class="docutils literal notranslate"><span class="pre">rbac.create</span></code> must also be set to <code class="docutils literal notranslate"><span class="pre">true</span></code> in order to fully enable the SCC usage.</p> |
| <p>For more information about SCCs and what can be achieved with this construct, please refer to <a class="reference external" href="https://docs.openshift.com/container-platform/latest/authentication/managing-security-context-constraints.html#scc-prioritization_configuring-internal-oauth/">Managing security context constraints</a>.</p> |
| </div> |
| <div class="section" id="security-context"> |
| <h2>Security Context<a class="headerlink" href="#security-context" title="Permalink to this headline">¶</a></h2> |
| <p>In Kubernetes a <code class="docutils literal notranslate"><span class="pre">securityContext</span></code> can be used to define user ids, group ids and capabilities such as running a container in privileged mode.</p> |
| <p>When deploying an application to Kubernetes, it is recommended to give the least privilege to containers so as |
| to reduce access and protect the host where the container is running.</p> |
| <p>In the Airflow Helm chart, the <code class="docutils literal notranslate"><span class="pre">securityContext</span></code> can be configured in several ways:</p> |
| <blockquote> |
| <div><ul class="simple"> |
| <li><p><a class="reference internal" href="parameters-ref.html#parameters-airflow"><span class="std std-ref">uid</span></a> (configures the global uid or RunAsUser)</p></li> |
| <li><p><a class="reference internal" href="parameters-ref.html#parameters-airflow"><span class="std std-ref">gid</span></a> (configures the global gid or fsGroup)</p></li> |
| <li><p><a class="reference internal" href="parameters-ref.html#parameters-kubernetes"><span class="std std-ref">securityContext</span></a> (same as <code class="docutils literal notranslate"><span class="pre">uid</span></code> but allows for setting all <a class="reference external" href="https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.18/#podsecuritycontext-v1-core">Pod securityContext options</a>)</p></li> |
| </ul> |
| </div></blockquote> |
| <p>The same way one can configure the global <a class="reference internal" href="parameters-ref.html#parameters-kubernetes"><span class="std std-ref">securityContext</span></a>, it is also possible to configure different values for specific workloads by setting their local <code class="docutils literal notranslate"><span class="pre">securityContext</span></code> as follows:</p> |
| <div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="nt">workers</span><span class="p">:</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">securityContext</span><span class="p">:</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">runAsUser</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">5000</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">fsGroup</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">0</span><span class="w"></span> |
| </pre></div> |
| </div> |
| <p>In the example above, the workers Pod <code class="docutils literal notranslate"><span class="pre">securityContext</span></code> will be set to <code class="docutils literal notranslate"><span class="pre">runAsUser:</span> <span class="pre">5000</span></code> and <code class="docutils literal notranslate"><span class="pre">runAsGroup:</span> <span class="pre">0</span></code>.</p> |
| <p>As one can see, the local setting will take precedence over the global setting when defined. The following explains the precedence rule for <code class="docutils literal notranslate"><span class="pre">securityContext</span></code> options in this chart:</p> |
| <div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="nt">uid</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">40000</span><span class="w"></span> |
| <span class="nt">gid</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">0</span><span class="w"></span> |
| |
| <span class="nt">securityContext</span><span class="p">:</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">runAsUser</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">50000</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">fsGroup</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">0</span><span class="w"></span> |
| |
| <span class="nt">workers</span><span class="p">:</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">securityContext</span><span class="p">:</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">runAsUser</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">1001</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">fsGroup</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">0</span><span class="w"></span> |
| </pre></div> |
| </div> |
| <p>This will generate the following worker deployment:</p> |
| <div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="nt">kind</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">StatefulSet</span><span class="w"></span> |
| <span class="nt">apiVersion</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">apps/v1</span><span class="w"></span> |
| <span class="nt">metadata</span><span class="p">:</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">airflow-worker</span><span class="w"></span> |
| <span class="nt">spec</span><span class="p">:</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">serviceName</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">airflow-worker</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">template</span><span class="p">:</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">spec</span><span class="p">:</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">securityContext</span><span class="p">:</span><span class="w"> </span><span class="c1"># As the securityContext was defined in ``workers``, its value will take priority</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">runAsUser</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">1001</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">fsGroup</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">0</span><span class="w"></span> |
| </pre></div> |
| </div> |
| <p>If we remove both the <code class="docutils literal notranslate"><span class="pre">securityContext</span></code> and <code class="docutils literal notranslate"><span class="pre">workers.securityContext</span></code> from the example above, the output will be the following:</p> |
| <div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="nt">uid</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">40000</span><span class="w"></span> |
| <span class="nt">gid</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">0</span><span class="w"></span> |
| |
| <span class="nt">securityContext</span><span class="p">:</span><span class="w"> </span><span class="p p-Indicator">{}</span><span class="w"></span> |
| |
| <span class="nt">workers</span><span class="p">:</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">securityContext</span><span class="p">:</span><span class="w"> </span><span class="p p-Indicator">{}</span><span class="w"></span> |
| </pre></div> |
| </div> |
| <p>This will generate the following worker deployment:</p> |
| <div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="nt">kind</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">StatefulSet</span><span class="w"></span> |
| <span class="nt">apiVersion</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">apps/v1</span><span class="w"></span> |
| <span class="nt">metadata</span><span class="p">:</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">airflow-worker</span><span class="w"></span> |
| <span class="nt">spec</span><span class="p">:</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">serviceName</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">airflow-worker</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">template</span><span class="p">:</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">spec</span><span class="p">:</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">securityContext</span><span class="p">:</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">runAsUser</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">40000</span><span class="w"> </span><span class="c1"># As the securityContext was not defined in ``workers`` or ``podSecurity``, the value from uid will be used</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">fsGroup</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">0</span><span class="w"> </span><span class="c1"># As the securityContext was not defined in ``workers`` or ``podSecurity``, the value from gid will be used</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">initContainers</span><span class="p">:</span><span class="w"></span> |
| <span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">wait-for-airflow-migrations</span><span class="w"></span> |
| <span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">...</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">containers</span><span class="p">:</span><span class="w"></span> |
| <span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">worker</span><span class="w"></span> |
| <span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">...</span><span class="w"></span> |
| </pre></div> |
| </div> |
| <p>And finally if we set <code class="docutils literal notranslate"><span class="pre">securityContext</span></code> but not <code class="docutils literal notranslate"><span class="pre">workers.securityContext</span></code>:</p> |
| <div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="nt">uid</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">40000</span><span class="w"></span> |
| <span class="nt">gid</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">0</span><span class="w"></span> |
| |
| <span class="nt">securityContext</span><span class="p">:</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">runAsUser</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">50000</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">fsGroup</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">0</span><span class="w"></span> |
| |
| <span class="nt">workers</span><span class="p">:</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">securityContext</span><span class="p">:</span><span class="w"> </span><span class="p p-Indicator">{}</span><span class="w"></span> |
| </pre></div> |
| </div> |
| <p>This will generate the following worker deployment:</p> |
| <div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="nt">kind</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">StatefulSet</span><span class="w"></span> |
| <span class="nt">apiVersion</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">apps/v1</span><span class="w"></span> |
| <span class="nt">metadata</span><span class="p">:</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">airflow-worker</span><span class="w"></span> |
| <span class="nt">spec</span><span class="p">:</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">serviceName</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">airflow-worker</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">template</span><span class="p">:</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">spec</span><span class="p">:</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">securityContext</span><span class="p">:</span><span class="w"> </span><span class="c1"># As the securityContext was not defined in ``workers``, the values from securityContext will take priority</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">runAsUser</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">50000</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">fsGroup</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">0</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">initContainers</span><span class="p">:</span><span class="w"></span> |
| <span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">wait-for-airflow-migrations</span><span class="w"></span> |
| <span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">...</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">containers</span><span class="p">:</span><span class="w"></span> |
| <span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">worker</span><span class="w"></span> |
| <span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">...</span><span class="w"></span> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="built-in-secrets-and-environment-variables"> |
| <h2>Built-in secrets and environment variables<a class="headerlink" href="#built-in-secrets-and-environment-variables" title="Permalink to this headline">¶</a></h2> |
| <p>The Helm Chart by default uses Kubernetes Secrets to store secrets that are needed by Airflow. |
| The contents of those secrets are by default turned into environment variables that are read by |
| Airflow (some of the environment variables have several variants to support older versions of Airflow).</p> |
| <p>By default, the secret names are determined from the Release Name used when the Helm Chart is deployed, |
| but you can also use a different secret to set the variables or disable using secrets |
| entirely and rely on environment variables (specifically if you want to use <code class="docutils literal notranslate"><span class="pre">_CMD</span></code> or <code class="docutils literal notranslate"><span class="pre">__SECRET</span></code> variant |
| of the environment variable.</p> |
| <p>However, Airflow supports other variants of setting secret configuration - you can specify a system |
| command to retrieve and automatically rotate the secret (by defining variable with <code class="docutils literal notranslate"><span class="pre">_CMD</span></code> suffix) or |
| to retrieve a variable from secret backed (by defining the variable with <code class="docutils literal notranslate"><span class="pre">_SECRET</span></code> suffix).</p> |
| <p>If the <code class="docutils literal notranslate"><span class="pre"><VARIABLE_NAME>></span></code> is set, it takes precedence over the <code class="docutils literal notranslate"><span class="pre">_CMD</span></code> and <code class="docutils literal notranslate"><span class="pre">_SECRET</span></code> variant, so |
| if you want to set one of the <code class="docutils literal notranslate"><span class="pre">_CMD</span></code> or <code class="docutils literal notranslate"><span class="pre">_SECRET</span></code> variants, you MUST disable the built in |
| variables retrieved from Kubernetes secrets, by setting <code class="docutils literal notranslate"><span class="pre">.Values.enableBuiltInSecretEnvVars.<VARIABLE_NAME></span></code> |
| to false.</p> |
| <p>For example in order to use a command to retrieve the DB connection you should (in your <code class="docutils literal notranslate"><span class="pre">values.yaml</span></code> |
| file) specify:</p> |
| <div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="nt">extraEnv</span><span class="p">:</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">AIRFLOW_CONN_AIRFLOW_DB_CMD</span><span class="p">:</span><span class="w"> </span><span class="s">"/usr/local/bin/retrieve_connection_url"</span><span class="w"></span> |
| <span class="nt">enableBuiltInSecretEnvVars</span><span class="p">:</span><span class="w"></span> |
| <span class="w"> </span><span class="nt">AIRFLOW_CONN_AIRFLOW_DB</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">false</span><span class="w"></span> |
| </pre></div> |
| </div> |
| <p>Here is the full list of secrets that can be disabled and replaced by <code class="docutils literal notranslate"><span class="pre">_CMD</span></code> and <code class="docutils literal notranslate"><span class="pre">_SECRET</span></code> variants:</p> |
| <table class="docutils align-default"> |
| <colgroup> |
| <col style="width: 37%" /> |
| <col style="width: 29%" /> |
| <col style="width: 34%" /> |
| </colgroup> |
| <thead> |
| <tr class="row-odd"><th class="head"><p>Default secret name if secret name not specified</p></th> |
| <th class="head"><p>Use a different Kubernetes Secret</p></th> |
| <th class="head"><p>Airflow Environment Variable</p></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre"><RELEASE_NAME>-airflow-metadata</span></code></p></td> |
| <td><p><code class="docutils literal notranslate"><span class="pre">.Values.data.metadataSecretName</span></code></p></td> |
| <td><div class="line-block"> |
| <div class="line"><code class="docutils literal notranslate"><span class="pre">AIRFLOW_CONN_AIRFLOW_DB</span></code></div> |
| <div class="line"><code class="docutils literal notranslate"><span class="pre">AIRFLOW__CORE__SQL_ALCHEMY_CONN</span></code></div> |
| </div> |
| </td> |
| </tr> |
| <tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre"><RELEASE_NAME>-fernet-key</span></code></p></td> |
| <td><p><code class="docutils literal notranslate"><span class="pre">.Values.fernetKeySecretName</span></code></p></td> |
| <td><p><code class="docutils literal notranslate"><span class="pre">AIRFLOW__CORE__FERNET_KEY</span></code></p></td> |
| </tr> |
| <tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre"><RELEASE_NAME>-webserver-secret-key</span></code></p></td> |
| <td><p><code class="docutils literal notranslate"><span class="pre">.Values.webserverSecretKeySecretName</span></code></p></td> |
| <td><p><code class="docutils literal notranslate"><span class="pre">AIRFLOW__WEBSERVER__SECRET_KEY</span></code></p></td> |
| </tr> |
| <tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre"><RELEASE_NAME>-airflow-result-backend</span></code></p></td> |
| <td><p><code class="docutils literal notranslate"><span class="pre">.Values.data.resultBackendSecretName</span></code></p></td> |
| <td><div class="line-block"> |
| <div class="line"><code class="docutils literal notranslate"><span class="pre">AIRFLOW__CELERY__CELERY_RESULT_BACKEND</span></code></div> |
| <div class="line"><code class="docutils literal notranslate"><span class="pre">AIRFLOW__CELERY__RESULT_BACKEND</span></code></div> |
| </div> |
| </td> |
| </tr> |
| <tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre"><RELEASE_NAME>-airflow-brokerUrl</span></code></p></td> |
| <td><p><code class="docutils literal notranslate"><span class="pre">.Values.data.brokerUrlSecretName</span></code></p></td> |
| <td><p><code class="docutils literal notranslate"><span class="pre">AIRFLOW__CELERY__BROKER_URL</span></code></p></td> |
| </tr> |
| <tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre"><RELEASE_NAME>-elasticsearch</span></code></p></td> |
| <td><p><code class="docutils literal notranslate"><span class="pre">.Values.elasticsearch.secretName</span></code></p></td> |
| <td><div class="line-block"> |
| <div class="line"><code class="docutils literal notranslate"><span class="pre">AIRFLOW__ELASTICSEARCH__HOST</span></code></div> |
| <div class="line"><code class="docutils literal notranslate"><span class="pre">AIRFLOW__ELASTICSEARCH__ELASTICSEARCH_HOST</span></code></div> |
| </div> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| <p>There are also a number of secrets, which names are also determined from the release name, that do not need to |
| be disabled. This is because either they do not follow the <code class="docutils literal notranslate"><span class="pre">_CMD</span></code> or <code class="docutils literal notranslate"><span class="pre">_SECRET</span></code> pattern, are variables |
| which do not start with <code class="docutils literal notranslate"><span class="pre">AIRFLOW__</span></code>, or they do not have a corresponding variable.</p> |
| <p>There is also one <code class="docutils literal notranslate"><span class="pre">_AIRFLOW__*</span></code> variable, <code class="docutils literal notranslate"><span class="pre">AIRFLOW__CELERY__FLOWER_BASIC_AUTH</span></code>, that does not need to be disabled, |
| even if you want set the <code class="docutils literal notranslate"><span class="pre">_CMD</span></code> and <code class="docutils literal notranslate"><span class="pre">_SECRET</span></code> variant. This variable is not set by default. It is only set |
| when <code class="docutils literal notranslate"><span class="pre">.Values.flower.secretName</span></code> is set or when <code class="docutils literal notranslate"><span class="pre">.Values.flower.user</span></code> and <code class="docutils literal notranslate"><span class="pre">.Values.flower.password</span></code> |
| are set. So if you do not set any of the <code class="docutils literal notranslate"><span class="pre">.Values.flower.*</span></code> variables, you can freely configure |
| flower Basic Auth using the <code class="docutils literal notranslate"><span class="pre">_CMD</span></code> or <code class="docutils literal notranslate"><span class="pre">_SECRET</span></code> variant without disabling the basic variant.</p> |
| <table class="docutils align-default"> |
| <colgroup> |
| <col style="width: 38%" /> |
| <col style="width: 29%" /> |
| <col style="width: 33%" /> |
| </colgroup> |
| <thead> |
| <tr class="row-odd"><th class="head"><p>Default secret name if secret name not specified</p></th> |
| <th class="head"><p>Use a different Kubernetes Secret</p></th> |
| <th class="head"><p>Airflow Environment Variable</p></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre"><RELEASE_NAME>-redis-password</span></code></p></td> |
| <td><p><code class="docutils literal notranslate"><span class="pre">.Values.redis.passwordSecretName</span></code></p></td> |
| <td><p><code class="docutils literal notranslate"><span class="pre">REDIS_PASSWORD</span></code></p></td> |
| </tr> |
| <tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre"><RELEASE_NAME>-pgbouncer-config</span></code></p></td> |
| <td><p><code class="docutils literal notranslate"><span class="pre">.Values.pgbouncer.configSecretName</span></code></p></td> |
| <td></td> |
| </tr> |
| <tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre"><RELEASE_NAME>-pgbouncer-certificates</span></code></p></td> |
| <td></td> |
| <td></td> |
| </tr> |
| <tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre"><RELEASE_NAME>-registry</span></code></p></td> |
| <td><p><code class="docutils literal notranslate"><span class="pre">.Values.registry.secretName</span></code></p></td> |
| <td></td> |
| </tr> |
| <tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre"><RELEASE_NAME>-kerberos-keytab</span></code></p></td> |
| <td></td> |
| <td></td> |
| </tr> |
| <tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre"><RELEASE_NAME>-flower</span></code></p></td> |
| <td><p><code class="docutils literal notranslate"><span class="pre">.Values.flower.secretName</span></code></p></td> |
| <td><p><code class="docutils literal notranslate"><span class="pre">AIRFLOW__CELERY__FLOWER_BASIC_AUTH</span></code></p></td> |
| </tr> |
| </tbody> |
| </table> |
| <p>You can read more about advanced ways of setting configuration variables in the |
| <a class="reference external" href="/docs/apache-airflow/stable/howto/set-config.html" title="(in apache-airflow v2.3.0.dev0)"><span>Setting Configuration Options</span></a>.</p> |
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