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| <div class="section" id="entrypoint"> |
| <h1>Entrypoint<a class="headerlink" href="#entrypoint" title="Permalink to this heading">¶</a></h1> |
| <p>If you are using the default entrypoint of the production image, |
| there are a few actions that are automatically performed when the container starts. |
| In some cases, you can pass environment variables to the image to trigger some of that behaviour.</p> |
| <p>The variables that control the “execution” behaviour start with <code class="docutils literal notranslate"><span class="pre">_AIRFLOW</span></code> to distinguish them |
| from the variables used to build the image starting with <code class="docutils literal notranslate"><span class="pre">AIRFLOW</span></code>.</p> |
| <div class="section" id="allowing-arbitrary-user-to-run-the-container"> |
| <span id="arbitrary-docker-user"></span><h2>Allowing arbitrary user to run the container<a class="headerlink" href="#allowing-arbitrary-user-to-run-the-container" title="Permalink to this heading">¶</a></h2> |
| <p>Airflow image is Open-Shift compatible, which means that you can start it with random user ID and the |
| group id <code class="docutils literal notranslate"><span class="pre">0</span></code> (<code class="docutils literal notranslate"><span class="pre">root</span></code>). If you want to run the image with user different than Airflow, you MUST set |
| GID of the user to <code class="docutils literal notranslate"><span class="pre">0</span></code>. In case you try to use different group, the entrypoint exits with error.</p> |
| <p>OpenShift randomly assigns UID when it starts the container, but you can utilise this flexible UID |
| also in case of running the image manually. This might be useful for example in case you want to |
| mount <code class="docutils literal notranslate"><span class="pre">dag</span></code> and <code class="docutils literal notranslate"><span class="pre">logs</span></code> folders from host system on Linux, in which case the UID should be set |
| the same ID as your host user.</p> |
| <p>This can be achieved in various ways - you can change USER when you extend or customize the image or |
| you can dynamically pass the user to <code class="docutils literal notranslate"><span class="pre">docker</span> <span class="pre">run</span></code> command, by adding <code class="docutils literal notranslate"><span class="pre">--user</span></code> flag in one of |
| those formats (See <a class="reference external" href="https://docs.docker.com/engine/reference/run/#user">Docker Run reference</a> for details):</p> |
| <div class="highlight-text notranslate"><div class="highlight"><pre><span></span>[ user | user:group | uid | uid:gid | user:gid | uid:group ] |
| </pre></div> |
| </div> |
| <p>In case of Docker Compose environment it can be changed via <code class="docutils literal notranslate"><span class="pre">user:</span></code> entry in the <code class="docutils literal notranslate"><span class="pre">docker-compose.yaml</span></code>. |
| See <a class="reference external" href="https://docs.docker.com/compose/compose-file/compose-file-v3/#domainname-hostname-ipc-mac_address-privileged-read_only-shm_size-stdin_open-tty-user-working_dir">Docker compose reference</a> |
| for details. In our Quickstart Guide using Docker-Compose, the UID can be passed via the |
| <code class="docutils literal notranslate"><span class="pre">AIRFLOW_UID</span></code> variable as described in |
| <a class="reference external" href="/docs/apache-airflow/stable/howto/docker-compose/index.html#initializing-docker-compose-environment" title="(in apache-airflow v2.10.0.dev0)"><span class="xref std std-ref">Initializing docker compose environment</span></a>.</p> |
| <p>The user can be any UID. In case UID is different than the default |
| <code class="docutils literal notranslate"><span class="pre">airflow</span></code> (UID=50000), the user will be automatically created when entering the container.</p> |
| <p>In order to accommodate a number of external libraries and projects, Airflow will automatically create |
| such an arbitrary user in (<cite>/etc/passwd</cite>) and make its home directory point to <code class="docutils literal notranslate"><span class="pre">/home/airflow</span></code>. |
| Many of 3rd-party libraries and packages require home directory of the user to be present, because they |
| need to write some cache information there, so such a dynamic creation of a user is necessary.</p> |
| <p>Such arbitrary user has to be able to write to certain directories that needs write access, and since |
| it is not advised to allow write access to “other” for security reasons, the OpenShift |
| guidelines introduced the concept of making all such folders have the <code class="docutils literal notranslate"><span class="pre">0</span></code> (<code class="docutils literal notranslate"><span class="pre">root</span></code>) group id (GID). |
| All the directories that need write access in the Airflow production image have GID set to 0 (and |
| they are writable for the group). We are following that concept and all the directories that need |
| write access follow that.</p> |
| <p>The GID=0 is set as default for the <code class="docutils literal notranslate"><span class="pre">airflow</span></code> user, so any directories it creates have GID set to 0 |
| by default. The entrypoint sets <code class="docutils literal notranslate"><span class="pre">umask</span></code> to be <code class="docutils literal notranslate"><span class="pre">0002</span></code> - this means that any directories created by |
| the user have also “group write” access for group <code class="docutils literal notranslate"><span class="pre">0</span></code> - they will be writable by other users with |
| <code class="docutils literal notranslate"><span class="pre">root</span></code> group. Also whenever any “arbitrary” user creates a folder (for example in a mounted volume), that |
| folder will have a “group write” access and <code class="docutils literal notranslate"><span class="pre">GID=0</span></code>, so that execution with another, arbitrary user |
| will still continue to work, even if such directory is mounted by another arbitrary user later.</p> |
| <p>The <code class="docutils literal notranslate"><span class="pre">umask</span></code> setting, however, only works for runtime of the container - it is not used during building of |
| the image. If you would like to extend the image and add your own packages, you should remember to add |
| <code class="docutils literal notranslate"><span class="pre">umask</span> <span class="pre">0002</span></code> in front of your docker command - this way the directories created by any installation |
| that need group access will also be writable for the group. This can be done for example this way:</p> |
| <blockquote> |
| <div><div class="highlight-docker notranslate"><div class="highlight"><pre><span></span><span class="k">RUN</span><span class="w"> </span><span class="nb">umask</span><span class="w"> </span><span class="m">0002</span><span class="p">;</span><span class="w"> </span><span class="se">\</span> |
| <span class="w"> </span>do_something<span class="p">;</span><span class="w"> </span><span class="se">\</span> |
| <span class="w"> </span>do_otherthing<span class="p">;</span> |
| </pre></div> |
| </div> |
| </div></blockquote> |
| <p>You can read more about it in the “Support arbitrary user ids” chapter in the |
| <a class="reference external" href="https://docs.openshift.com/container-platform/4.7/openshift_images/create-images.html#images-create-guide-openshift_create-images">Openshift best practices</a>.</p> |
| </div> |
| <div class="section" id="waits-for-airflow-db-connection"> |
| <h2>Waits for Airflow DB connection<a class="headerlink" href="#waits-for-airflow-db-connection" title="Permalink to this heading">¶</a></h2> |
| <p>The entrypoint is waiting for a connection to the database independent of the database engine. This allows us to increase |
| the stability of the environment.</p> |
| <p>Waiting for connection involves executing <code class="docutils literal notranslate"><span class="pre">airflow</span> <span class="pre">db</span> <span class="pre">check</span></code> command, which means that a <code class="docutils literal notranslate"><span class="pre">select</span> <span class="pre">1</span> <span class="pre">as</span> <span class="pre">is_alive;</span></code> statement |
| is executed. Then it loops until the command will be successful. |
| It tries <span class="target" id="index-0"></span><code class="xref std std-envvar docutils literal notranslate"><span class="pre">CONNECTION_CHECK_MAX_COUNT</span></code> times and sleeps <span class="target" id="index-1"></span><code class="xref std std-envvar docutils literal notranslate"><span class="pre">CONNECTION_CHECK_SLEEP_TIME</span></code> between checks |
| To disable check, set <code class="docutils literal notranslate"><span class="pre">CONNECTION_CHECK_MAX_COUNT=0</span></code>.</p> |
| </div> |
| <div class="section" id="waits-for-celery-broker-connection"> |
| <h2>Waits for Celery broker connection<a class="headerlink" href="#waits-for-celery-broker-connection" title="Permalink to this heading">¶</a></h2> |
| <p>In case CeleryExecutor is used, and one of the <code class="docutils literal notranslate"><span class="pre">scheduler</span></code>, <code class="docutils literal notranslate"><span class="pre">celery</span></code> |
| commands are used the entrypoint will wait until the Celery broker DB connection is available.</p> |
| <p>The script detects backend type depending on the URL schema and assigns default port numbers if not specified |
| in the URL. Then it loops until connection to the host/port specified can be established |
| It tries <span class="target" id="index-2"></span><code class="xref std std-envvar docutils literal notranslate"><span class="pre">CONNECTION_CHECK_MAX_COUNT</span></code> times and sleeps <span class="target" id="index-3"></span><code class="xref std std-envvar docutils literal notranslate"><span class="pre">CONNECTION_CHECK_SLEEP_TIME</span></code> between checks. |
| To disable check, set <code class="docutils literal notranslate"><span class="pre">CONNECTION_CHECK_MAX_COUNT=0</span></code>.</p> |
| <p>Supported schemes:</p> |
| <ul class="simple"> |
| <li><p><code class="docutils literal notranslate"><span class="pre">amqp(s)://</span></code> (rabbitmq) - default port 5672</p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">redis://</span></code> - default port 6379</p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">postgres://</span></code> - default port 5432</p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">mysql://</span></code> - default port 3306</p></li> |
| </ul> |
| <p>Waiting for connection involves checking if a matching port is open. The host information is derived from the Airflow configuration.</p> |
| </div> |
| <div class="section" id="executing-commands"> |
| <span id="entrypoint-commands"></span><h2>Executing commands<a class="headerlink" href="#executing-commands" title="Permalink to this heading">¶</a></h2> |
| <p>If first argument equals to “bash” - you are dropped to a bash shell or you can executes bash command |
| if you specify extra arguments. For example:</p> |
| <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>docker<span class="w"> </span>run<span class="w"> </span>-it<span class="w"> </span>apache/airflow:2.9.0-python3.8<span class="w"> </span>bash<span class="w"> </span>-c<span class="w"> </span><span class="s2">"ls -la"</span> |
| total<span class="w"> </span><span class="m">16</span> |
| drwxr-xr-x<span class="w"> </span><span class="m">4</span><span class="w"> </span>airflow<span class="w"> </span>root<span class="w"> </span><span class="m">4096</span><span class="w"> </span>Jun<span class="w"> </span><span class="m">5</span><span class="w"> </span><span class="m">18</span>:12<span class="w"> </span>. |
| drwxr-xr-x<span class="w"> </span><span class="m">1</span><span class="w"> </span>root<span class="w"> </span>root<span class="w"> </span><span class="m">4096</span><span class="w"> </span>Jun<span class="w"> </span><span class="m">5</span><span class="w"> </span><span class="m">18</span>:12<span class="w"> </span>.. |
| drwxr-xr-x<span class="w"> </span><span class="m">2</span><span class="w"> </span>airflow<span class="w"> </span>root<span class="w"> </span><span class="m">4096</span><span class="w"> </span>Jun<span class="w"> </span><span class="m">5</span><span class="w"> </span><span class="m">18</span>:12<span class="w"> </span>dags |
| drwxr-xr-x<span class="w"> </span><span class="m">2</span><span class="w"> </span>airflow<span class="w"> </span>root<span class="w"> </span><span class="m">4096</span><span class="w"> </span>Jun<span class="w"> </span><span class="m">5</span><span class="w"> </span><span class="m">18</span>:12<span class="w"> </span>logs |
| </pre></div> |
| </div> |
| <p>If first argument is equal to <code class="docutils literal notranslate"><span class="pre">python</span></code> - you are dropped in python shell or python commands are executed if |
| you pass extra parameters. For example:</p> |
| <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>><span class="w"> </span>docker<span class="w"> </span>run<span class="w"> </span>-it<span class="w"> </span>apache/airflow:2.9.0-python3.8<span class="w"> </span>python<span class="w"> </span>-c<span class="w"> </span><span class="s2">"print('test')"</span> |
| <span class="nb">test</span> |
| </pre></div> |
| </div> |
| <p>If first argument equals to “airflow” - the rest of the arguments is treated as an airflow command |
| to execute. Example:</p> |
| <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>docker<span class="w"> </span>run<span class="w"> </span>-it<span class="w"> </span>apache/airflow:2.9.0-python3.8<span class="w"> </span>airflow<span class="w"> </span>webserver |
| </pre></div> |
| </div> |
| <p>If there are any other arguments - they are simply passed to the “airflow” command</p> |
| <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>><span class="w"> </span>docker<span class="w"> </span>run<span class="w"> </span>-it<span class="w"> </span>apache/airflow:2.9.0-python3.8<span class="w"> </span><span class="nb">help</span> |
| <span class="w"> </span>usage:<span class="w"> </span>airflow<span class="w"> </span><span class="o">[</span>-h<span class="o">]</span><span class="w"> </span>GROUP_OR_COMMAND<span class="w"> </span>... |
| |
| <span class="w"> </span>positional<span class="w"> </span>arguments: |
| <span class="w"> </span>GROUP_OR_COMMAND |
| |
| <span class="w"> </span>Groups: |
| <span class="w"> </span>celery<span class="w"> </span>Celery<span class="w"> </span>components |
| <span class="w"> </span>config<span class="w"> </span>View<span class="w"> </span>configuration |
| <span class="w"> </span>connections<span class="w"> </span>Manage<span class="w"> </span>connections |
| <span class="w"> </span>dags<span class="w"> </span>Manage<span class="w"> </span>DAGs |
| <span class="w"> </span>db<span class="w"> </span>Database<span class="w"> </span>operations |
| <span class="w"> </span><span class="nb">jobs</span><span class="w"> </span>Manage<span class="w"> </span><span class="nb">jobs</span> |
| <span class="w"> </span>kubernetes<span class="w"> </span>Tools<span class="w"> </span>to<span class="w"> </span><span class="nb">help</span><span class="w"> </span>run<span class="w"> </span>the<span class="w"> </span>KubernetesExecutor |
| <span class="w"> </span>pools<span class="w"> </span>Manage<span class="w"> </span>pools |
| <span class="w"> </span>providers<span class="w"> </span>Display<span class="w"> </span>providers |
| <span class="w"> </span>roles<span class="w"> </span>Manage<span class="w"> </span>roles |
| <span class="w"> </span>tasks<span class="w"> </span>Manage<span class="w"> </span>tasks |
| <span class="w"> </span>users<span class="w"> </span>Manage<span class="w"> </span>users |
| <span class="w"> </span>variables<span class="w"> </span>Manage<span class="w"> </span>variables |
| |
| <span class="w"> </span>Commands: |
| <span class="w"> </span>cheat-sheet<span class="w"> </span>Display<span class="w"> </span>cheat<span class="w"> </span>sheet |
| <span class="w"> </span>info<span class="w"> </span>Show<span class="w"> </span>information<span class="w"> </span>about<span class="w"> </span>current<span class="w"> </span>Airflow<span class="w"> </span>and<span class="w"> </span>environment |
| <span class="w"> </span>kerberos<span class="w"> </span>Start<span class="w"> </span>a<span class="w"> </span>Kerberos<span class="w"> </span>ticket<span class="w"> </span>renewer |
| <span class="w"> </span>plugins<span class="w"> </span>Dump<span class="w"> </span>information<span class="w"> </span>about<span class="w"> </span>loaded<span class="w"> </span>plugins |
| <span class="w"> </span>rotate-fernet-key |
| <span class="w"> </span>Rotate<span class="w"> </span>encrypted<span class="w"> </span>connection<span class="w"> </span>credentials<span class="w"> </span>and<span class="w"> </span>variables |
| <span class="w"> </span>scheduler<span class="w"> </span>Start<span class="w"> </span>a<span class="w"> </span>scheduler<span class="w"> </span>instance |
| <span class="w"> </span>sync-perm<span class="w"> </span>Update<span class="w"> </span>permissions<span class="w"> </span><span class="k">for</span><span class="w"> </span>existing<span class="w"> </span>roles<span class="w"> </span>and<span class="w"> </span>optionally<span class="w"> </span>DAGs |
| <span class="w"> </span>version<span class="w"> </span>Show<span class="w"> </span>the<span class="w"> </span>version |
| <span class="w"> </span>webserver<span class="w"> </span>Start<span class="w"> </span>a<span class="w"> </span>Airflow<span class="w"> </span>webserver<span class="w"> </span>instance |
| |
| <span class="w"> </span>optional<span class="w"> </span>arguments: |
| <span class="w"> </span>-h,<span class="w"> </span>--help<span class="w"> </span>show<span class="w"> </span>this<span class="w"> </span><span class="nb">help</span><span class="w"> </span>message<span class="w"> </span>and<span class="w"> </span><span class="nb">exit</span> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="execute-custom-code-before-the-airflow-entrypoint"> |
| <h2>Execute custom code before the Airflow entrypoint<a class="headerlink" href="#execute-custom-code-before-the-airflow-entrypoint" title="Permalink to this heading">¶</a></h2> |
| <p>If you want to execute some custom code before Airflow’s entrypoint you can by using |
| a custom script and calling Airflow’s entrypoint as the |
| last <code class="docutils literal notranslate"><span class="pre">exec</span></code> instruction in your custom one. However, you have to remember to use <code class="docutils literal notranslate"><span class="pre">dumb-init</span></code> in the same |
| way as it is used with Airflow’s entrypoint, otherwise you might have problems with proper signal |
| propagation (See the next chapter).</p> |
| <div class="highlight-Dockerfile notranslate"><div class="highlight"><pre><span></span><span class="k">FROM</span><span class="w"> </span><span class="s">airflow:2.9.0.dev0</span> |
| <span class="k">COPY</span><span class="w"> </span>my_entrypoint.sh<span class="w"> </span>/ |
| <span class="k">ENTRYPOINT</span><span class="w"> </span><span class="p">[</span><span class="s2">"/usr/bin/dumb-init"</span><span class="p">,</span><span class="w"> </span><span class="s2">"--"</span><span class="p">,</span><span class="w"> </span><span class="s2">"/my_entrypoint.sh"</span><span class="p">]</span> |
| </pre></div> |
| </div> |
| <p>Your entrypoint might for example modify or add variables on the fly. For example the below |
| entrypoint sets max count of DB checks from the first parameter passed as parameter of the image |
| execution (A bit useless example but should give the reader an example of how you could use it).</p> |
| <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span><span class="ch">#!/bin/bash</span> |
| <span class="nb">export</span><span class="w"> </span><span class="nv">CONNECTION_CHECK_MAX_COUNT</span><span class="o">=</span><span class="si">${</span><span class="nv">1</span><span class="si">}</span> |
| <span class="nb">shift</span> |
| <span class="nb">exec</span><span class="w"> </span>/entrypoint<span class="w"> </span><span class="s2">"</span><span class="si">${</span><span class="p">@</span><span class="si">}</span><span class="s2">"</span> |
| </pre></div> |
| </div> |
| <p>Make sure Airflow’s entrypoint is run with <code class="docutils literal notranslate"><span class="pre">exec</span> <span class="pre">/entrypoint</span> <span class="pre">"${@}"</span></code> as the last command in your |
| custom entrypoint. This way signals will be properly propagated and arguments will be passed |
| to the entrypoint as usual (you can use <code class="docutils literal notranslate"><span class="pre">shift</span></code> as above if you need to pass some extra |
| arguments. Note that passing secret values this way or storing secrets inside the image is a bad |
| idea from security point of view - as both image and parameters to run the image with are accessible |
| to anyone who has access to logs of your Kubernetes or image registry.</p> |
| <p>Also be aware that code executed before Airflow’s entrypoint should not create any files or |
| directories inside the container and everything might not work the same way when it is executed. |
| Before Airflow entrypoint is executed, the following functionalities are not available:</p> |
| <ul class="simple"> |
| <li><p>umask is not set properly to allow <code class="docutils literal notranslate"><span class="pre">group</span></code> write access</p></li> |
| <li><p>user is not yet created in <code class="docutils literal notranslate"><span class="pre">/etc/passwd</span></code> if an arbitrary user is used to run the image</p></li> |
| <li><p>the database and brokers might not be available yet</p></li> |
| </ul> |
| </div> |
| <div class="section" id="adding-custom-image-behaviour"> |
| <h2>Adding custom image behaviour<a class="headerlink" href="#adding-custom-image-behaviour" title="Permalink to this heading">¶</a></h2> |
| <p>The Airflow image executes a lot of steps in the entrypoint, and sets the right environment, but |
| you might want to run additional code after the entrypoint creates the user, sets the umask, sets |
| variables and checks that database is running.</p> |
| <p>Rather than running regular commands - <code class="docutils literal notranslate"><span class="pre">scheduler</span></code>, <code class="docutils literal notranslate"><span class="pre">webserver</span></code> you can run <em>custom</em> script that |
| you can embed into the image. You can even execute the usual components of airflow - |
| <code class="docutils literal notranslate"><span class="pre">scheduler</span></code>, <code class="docutils literal notranslate"><span class="pre">webserver</span></code> in your custom script when you finish your custom setup. |
| Similarly to custom entrypoint, it can be added to the image by extending it.</p> |
| <div class="highlight-Dockerfile notranslate"><div class="highlight"><pre><span></span><span class="k">FROM</span><span class="w"> </span><span class="s">airflow:2.9.0.dev0</span> |
| <span class="k">COPY</span><span class="w"> </span>my_after_entrypoint_script.sh<span class="w"> </span>/ |
| </pre></div> |
| </div> |
| <p>Build your image and then you can run this script by running the command:</p> |
| <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>docker<span class="w"> </span>build<span class="w"> </span>.<span class="w"> </span>--pull<span class="w"> </span>--tag<span class="w"> </span>my-image:0.0.1 |
| docker<span class="w"> </span>run<span class="w"> </span>-it<span class="w"> </span>my-image:0.0.1<span class="w"> </span>bash<span class="w"> </span>-c<span class="w"> </span><span class="s2">"/my_after_entrypoint_script.sh"</span> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="signal-propagation"> |
| <h2>Signal propagation<a class="headerlink" href="#signal-propagation" title="Permalink to this heading">¶</a></h2> |
| <p>Airflow uses <code class="docutils literal notranslate"><span class="pre">dumb-init</span></code> to run as “init” in the entrypoint. This is in order to propagate |
| signals and reap child processes properly. This means that the process that you run does not have |
| to install signal handlers to work properly and be killed when the container is gracefully terminated. |
| The behaviour of signal propagation is configured by <code class="docutils literal notranslate"><span class="pre">DUMB_INIT_SETSID</span></code> variable which is set to |
| <code class="docutils literal notranslate"><span class="pre">1</span></code> by default - meaning that the signals will be propagated to the whole process group, but you can |
| set it to <code class="docutils literal notranslate"><span class="pre">0</span></code> to enable <code class="docutils literal notranslate"><span class="pre">single-child</span></code> behaviour of <code class="docutils literal notranslate"><span class="pre">dumb-init</span></code> which only propagates the |
| signals to only single child process.</p> |
| <p>The table below summarizes <code class="docutils literal notranslate"><span class="pre">DUMB_INIT_SETSID</span></code> possible values and their use cases.</p> |
| <table class="docutils align-default"> |
| <colgroup> |
| <col style="width: 19%" /> |
| <col style="width: 81%" /> |
| </colgroup> |
| <tbody> |
| <tr class="row-odd"><td><p>Variable value</p></td> |
| <td><p>Use case</p></td> |
| </tr> |
| <tr class="row-even"><td><p>1 (default)</p></td> |
| <td><p>Propagates signals to all processes in the process group of the main |
| process running in the container.</p> |
| <p>If you run your processes via <code class="docutils literal notranslate"><span class="pre">["bash",</span> <span class="pre">"-c"]</span></code> command and bash |
| spawn new processes without <code class="docutils literal notranslate"><span class="pre">exec</span></code>, this will help to terminate |
| your container gracefully as all processes will receive the signal.</p> |
| </td> |
| </tr> |
| <tr class="row-odd"><td><p>0</p></td> |
| <td><p>Propagates signals to the main process only.</p> |
| <p>This is useful if your main process handles signals gracefully. |
| A good example is warm shutdown of Celery workers. The <code class="docutils literal notranslate"><span class="pre">dumb-init</span></code> |
| in this case will only propagate the signals to the main process, |
| but not to the processes that are spawned in the same process |
| group as the main one. For example in case of Celery, the main |
| process will put the worker in “offline” mode, and will wait |
| until all running tasks complete, and only then it will |
| terminate all processes.</p> |
| <p>For Airflow’s Celery worker, you should set the variable to 0 |
| and either use <code class="docutils literal notranslate"><span class="pre">["celery",</span> <span class="pre">"worker"]</span></code> command. |
| If you are running it through <code class="docutils literal notranslate"><span class="pre">["bash",</span> <span class="pre">"-c"]</span></code> command, |
| you need to start the worker via <code class="docutils literal notranslate"><span class="pre">exec</span> <span class="pre">airflow</span> <span class="pre">celery</span> <span class="pre">worker</span></code> |
| as the last command executed.</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <div class="section" id="additional-quick-test-options"> |
| <h2>Additional quick test options<a class="headerlink" href="#additional-quick-test-options" title="Permalink to this heading">¶</a></h2> |
| <p>The options below are mostly used for quick testing the image - for example with |
| quick-start docker-compose or when you want to perform a local test with new packages |
| added. They are not supposed to be run in the production environment as they add additional |
| overhead for execution of additional commands. Those options in production should be realized |
| either as maintenance operations on the database or should be embedded in the custom image used |
| (when you want to add new packages).</p> |
| <div class="section" id="upgrading-airflow-db"> |
| <h3>Upgrading Airflow DB<a class="headerlink" href="#upgrading-airflow-db" title="Permalink to this heading">¶</a></h3> |
| <p>If you set <span class="target" id="index-4"></span><code class="xref std std-envvar docutils literal notranslate"><span class="pre">_AIRFLOW_DB_MIGRATE</span></code> variable to a non-empty value, the entrypoint will run |
| the <code class="docutils literal notranslate"><span class="pre">airflow</span> <span class="pre">db</span> <span class="pre">migrate</span></code> command right after verifying the connection. You can also use this |
| when you are running airflow with internal SQLite database (default) to upgrade the db and create |
| admin users at entrypoint, so that you can start the webserver immediately. Note - using SQLite is |
| intended only for testing purpose, never use SQLite in production as it has severe limitations when it |
| comes to concurrency.</p> |
| </div> |
| <div class="section" id="creating-admin-user"> |
| <h3>Creating admin user<a class="headerlink" href="#creating-admin-user" title="Permalink to this heading">¶</a></h3> |
| <p>The entrypoint can also create webserver user automatically when you enter it. you need to set |
| <span class="target" id="index-5"></span><code class="xref std std-envvar docutils literal notranslate"><span class="pre">_AIRFLOW_WWW_USER_CREATE</span></code> to a non-empty value in order to do that. This is not intended for |
| production, it is only useful if you would like to run a quick test with the production image. |
| You need to pass at least password to create such user via <code class="docutils literal notranslate"><span class="pre">_AIRFLOW_WWW_USER_PASSWORD</span></code> or |
| <span class="target" id="index-6"></span><code class="xref std std-envvar docutils literal notranslate"><span class="pre">_AIRFLOW_WWW_USER_PASSWORD_CMD</span></code> similarly like for other <code class="docutils literal notranslate"><span class="pre">*_CMD</span></code> variables, the content of |
| the <code class="docutils literal notranslate"><span class="pre">*_CMD</span></code> will be evaluated as shell command and its output will be set as password.</p> |
| <p>User creation will fail if none of the <code class="docutils literal notranslate"><span class="pre">PASSWORD</span></code> variables are set - there is no default for |
| password for security reasons.</p> |
| <table class="docutils align-default"> |
| <colgroup> |
| <col style="width: 10%" /> |
| <col style="width: 24%" /> |
| <col style="width: 65%" /> |
| </colgroup> |
| <thead> |
| <tr class="row-odd"><th class="head"><p>Parameter</p></th> |
| <th class="head"><p>Default</p></th> |
| <th class="head"><p>Environment variable</p></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr class="row-even"><td><p>username</p></td> |
| <td><p>admin</p></td> |
| <td><p><code class="docutils literal notranslate"><span class="pre">_AIRFLOW_WWW_USER_USERNAME</span></code></p></td> |
| </tr> |
| <tr class="row-odd"><td><p>password</p></td> |
| <td></td> |
| <td><p><code class="docutils literal notranslate"><span class="pre">_AIRFLOW_WWW_USER_PASSWORD_CMD</span></code> or <code class="docutils literal notranslate"><span class="pre">_AIRFLOW_WWW_USER_PASSWORD</span></code></p></td> |
| </tr> |
| <tr class="row-even"><td><p>firstname</p></td> |
| <td><p>Airflow</p></td> |
| <td><p><code class="docutils literal notranslate"><span class="pre">_AIRFLOW_WWW_USER_FIRSTNAME</span></code></p></td> |
| </tr> |
| <tr class="row-odd"><td><p>lastname</p></td> |
| <td><p>Admin</p></td> |
| <td><p><code class="docutils literal notranslate"><span class="pre">_AIRFLOW_WWW_USER_LASTNAME</span></code></p></td> |
| </tr> |
| <tr class="row-even"><td><p>email</p></td> |
| <td><p><a class="reference external" href="mailto:airflowadmin%40example.com">airflowadmin<span>@</span>example<span>.</span>com</a></p></td> |
| <td><p><code class="docutils literal notranslate"><span class="pre">_AIRFLOW_WWW_USER_EMAIL</span></code></p></td> |
| </tr> |
| <tr class="row-odd"><td><p>role</p></td> |
| <td><p>Admin</p></td> |
| <td><p><code class="docutils literal notranslate"><span class="pre">_AIRFLOW_WWW_USER_ROLE</span></code></p></td> |
| </tr> |
| </tbody> |
| </table> |
| <p>In case the password is specified, the user will be attempted to be created, but the entrypoint will |
| not fail if the attempt fails (this accounts for the case that the user is already created).</p> |
| <p>You can, for example start the webserver in the production image with initializing the internal SQLite |
| database and creating an <code class="docutils literal notranslate"><span class="pre">admin/admin</span></code> Admin user with the following command:</p> |
| <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>docker<span class="w"> </span>run<span class="w"> </span>-it<span class="w"> </span>-p<span class="w"> </span><span class="m">8080</span>:8080<span class="w"> </span><span class="se">\</span> |
| <span class="w"> </span>--env<span class="w"> </span><span class="s2">"_AIRFLOW_DB_MIGRATE=true"</span><span class="w"> </span><span class="se">\</span> |
| <span class="w"> </span>--env<span class="w"> </span><span class="s2">"_AIRFLOW_WWW_USER_CREATE=true"</span><span class="w"> </span><span class="se">\</span> |
| <span class="w"> </span>--env<span class="w"> </span><span class="s2">"_AIRFLOW_WWW_USER_PASSWORD=admin"</span><span class="w"> </span><span class="se">\</span> |
| <span class="w"> </span>apache/airflow:2.9.0-python3.8<span class="w"> </span>webserver |
| </pre></div> |
| </div> |
| <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>docker<span class="w"> </span>run<span class="w"> </span>-it<span class="w"> </span>-p<span class="w"> </span><span class="m">8080</span>:8080<span class="w"> </span><span class="se">\</span> |
| <span class="w"> </span>--env<span class="w"> </span><span class="s2">"_AIRFLOW_DB_MIGRATE=true"</span><span class="w"> </span><span class="se">\</span> |
| <span class="w"> </span>--env<span class="w"> </span><span class="s2">"_AIRFLOW_WWW_USER_CREATE=true"</span><span class="w"> </span><span class="se">\</span> |
| <span class="w"> </span>--env<span class="w"> </span><span class="s2">"_AIRFLOW_WWW_USER_PASSWORD_CMD=echo admin"</span><span class="w"> </span><span class="se">\</span> |
| <span class="w"> </span>apache/airflow:2.9.0-python3.8<span class="w"> </span>webserver |
| </pre></div> |
| </div> |
| <p>The commands above perform initialization of the SQLite database, create admin user with admin password |
| and Admin role. They also forward local port <code class="docutils literal notranslate"><span class="pre">8080</span></code> to the webserver port and finally start the webserver.</p> |
| </div> |
| <div class="section" id="installing-additional-requirements"> |
| <h3>Installing additional requirements<a class="headerlink" href="#installing-additional-requirements" title="Permalink to this heading">¶</a></h3> |
| <div class="admonition warning"> |
| <p class="admonition-title">Warning</p> |
| <p>Installing requirements this way is a very convenient method of running Airflow, very useful for |
| testing and debugging. However, do not be tricked by its convenience. You should never, ever use it in |
| production environment. We have deliberately chose to make it a development/test dependency and we print |
| a warning, whenever it is used. There is an inherent security-related issue with using this method in |
| production. Installing the requirements this way can happen at literally any time - when your containers |
| get restarted, when your machines in K8S cluster get restarted. In a K8S Cluster those events can happen |
| literally any time. This opens you up to a serious vulnerability where your production environment |
| might be brought down by a single dependency being removed from PyPI - or even dependency of your |
| dependency. This means that you put your production service availability in hands of 3rd-party developers. |
| At any time, any moment including weekends and holidays those 3rd party developers might bring your |
| production Airflow instance down, without you even knowing it. This is a serious vulnerability that |
| is similar to the infamous |
| <a class="reference external" href="https://qz.com/646467/how-one-programmer-broke-the-internet-by-deleting-a-tiny-piece-of-code/">leftpad</a> |
| problem. You can fully protect against this case by building your own, immutable custom image, where the |
| dependencies are baked in. You have been warned.</p> |
| </div> |
| <p>Installing additional requirements can be done by specifying <code class="docutils literal notranslate"><span class="pre">_PIP_ADDITIONAL_REQUIREMENTS</span></code> variable. |
| The variable should contain a list of requirements that should be installed additionally when entering |
| the containers. Note that this option slows down starting of Airflow as every time any container starts |
| it must install new packages and it opens up huge potential security vulnerability when used in production |
| (see below). Therefore this option should only be used for testing. When testing is finished, |
| you should create your custom image with dependencies baked in.</p> |
| <p>Example:</p> |
| <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>docker<span class="w"> </span>run<span class="w"> </span>-it<span class="w"> </span>-p<span class="w"> </span><span class="m">8080</span>:8080<span class="w"> </span><span class="se">\</span> |
| <span class="w"> </span>--env<span class="w"> </span><span class="s2">"_PIP_ADDITIONAL_REQUIREMENTS=lxml==4.6.3 charset-normalizer==1.4.1"</span><span class="w"> </span><span class="se">\</span> |
| <span class="w"> </span>--env<span class="w"> </span><span class="s2">"_AIRFLOW_DB_MIGRATE=true"</span><span class="w"> </span><span class="se">\</span> |
| <span class="w"> </span>--env<span class="w"> </span><span class="s2">"_AIRFLOW_WWW_USER_CREATE=true"</span><span class="w"> </span><span class="se">\</span> |
| <span class="w"> </span>--env<span class="w"> </span><span class="s2">"_AIRFLOW_WWW_USER_PASSWORD_CMD=echo admin"</span><span class="w"> </span><span class="se">\</span> |
| <span class="w"> </span>apache/airflow:2.9.0-python3.8<span class="w"> </span>webserver |
| </pre></div> |
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| <p>This method is only available starting from Docker image of Airflow 2.1.1 and above.</p> |
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