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<blockquote>
<div></div></blockquote>
<div class="section" id="production-deployment">
<h1>Production Deployment<a class="headerlink" href="#production-deployment" title="Permalink to this headline"></a></h1>
<p>It is time to deploy your DAG in production. To do this, first, you need to make sure that the Airflow
is itself production-ready. Let’s see what precautions you need to take.</p>
<div class="section" id="database-backend">
<h2>Database backend<a class="headerlink" href="#database-backend" title="Permalink to this headline"></a></h2>
<p>Airflow comes with an <code class="docutils literal notranslate"><span class="pre">SQLite</span></code> backend by default. This allows the user to run Airflow without any external
database. However, such a setup is meant to be used for testing purposes only; running the default setup
in production can lead to data loss in multiple scenarios. If you want to run production-grade Airflow,
make sure you <a class="reference internal" href="howto/set-up-database.html"><span class="doc">configure the backend</span></a> to be an external database
such as PostgreSQL or MySQL.</p>
<p>You can change the backend using the following config</p>
<div class="highlight-ini notranslate"><div class="highlight"><pre><span></span><span class="k">[core]</span>
<span class="na">sql_alchemy_conn</span> <span class="o">=</span> <span class="s">my_conn_string</span>
</pre></div>
</div>
<p>Once you have changed the backend, airflow needs to create all the tables required for operation.
Create an empty DB and give airflow’s user the permission to <code class="docutils literal notranslate"><span class="pre">CREATE/ALTER</span></code> it.
Once that is done, you can run -</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>airflow db upgrade
</pre></div>
</div>
<p><code class="docutils literal notranslate"><span class="pre">upgrade</span></code> keeps track of migrations already applied, so it’s safe to run as often as you need.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>Do not use <code class="docutils literal notranslate"><span class="pre">airflow</span> <span class="pre">db</span> <span class="pre">init</span></code> as it can create a lot of default connections, charts, etc. which are not
required in production DB.</p>
</div>
</div>
<div class="section" id="multi-node-cluster">
<h2>Multi-Node Cluster<a class="headerlink" href="#multi-node-cluster" title="Permalink to this headline"></a></h2>
<p>Airflow uses <a class="reference internal" href="_api/airflow/executors/sequential_executor/index.html#airflow.executors.sequential_executor.SequentialExecutor" title="airflow.executors.sequential_executor.SequentialExecutor"><code class="xref py py-class docutils literal notranslate"><span class="pre">SequentialExecutor</span></code></a> by default. However, by its
nature, the user is limited to executing at most one task at a time. <code class="docutils literal notranslate"><span class="pre">Sequential</span> <span class="pre">Executor</span></code> also pauses
the scheduler when it runs a task, hence it is not recommended in a production setup. You should use the
<a class="reference internal" href="_api/airflow/executors/local_executor/index.html#airflow.executors.local_executor.LocalExecutor" title="airflow.executors.local_executor.LocalExecutor"><code class="xref py py-class docutils literal notranslate"><span class="pre">LocalExecutor</span></code></a> for a single machine.
For a multi-node setup, you should use the <a class="reference internal" href="executor/kubernetes.html"><span class="doc">Kubernetes executor</span></a> or
the <a class="reference internal" href="executor/celery.html"><span class="doc">Celery executor</span></a>.</p>
<p>Once you have configured the executor, it is necessary to make sure that every node in the cluster contains
the same configuration and dags. Airflow sends simple instructions such as “execute task X of dag Y”, but
does not send any dag files or configuration. You can use a simple cronjob or any other mechanism to sync
DAGs and configs across your nodes, e.g., checkout DAGs from git repo every 5 minutes on all nodes.</p>
</div>
<div class="section" id="logging">
<h2>Logging<a class="headerlink" href="#logging" title="Permalink to this headline"></a></h2>
<p>If you are using disposable nodes in your cluster, configure the log storage to be a distributed file system
(DFS) such as <code class="docutils literal notranslate"><span class="pre">S3</span></code> and <code class="docutils literal notranslate"><span class="pre">GCS</span></code>, or external services such as Stackdriver Logging, Elasticsearch or
Amazon CloudWatch. This way, the logs are available even after the node goes down or gets replaced.
See <a class="reference internal" href="logging-monitoring/logging-tasks.html"><span class="doc">Logging for Tasks</span></a> for configurations.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>The logs only appear in your DFS after the task has finished. You can view the logs while the task is
running in UI itself.</p>
</div>
</div>
<div class="section" id="configuration">
<h2>Configuration<a class="headerlink" href="#configuration" title="Permalink to this headline"></a></h2>
<p>Airflow comes bundled with a default <code class="docutils literal notranslate"><span class="pre">airflow.cfg</span></code> configuration file.
You should use environment variables for configurations that change across deployments
e.g. metadata DB, password, etc. You can accomplish this using the format <span class="target" id="index-0"></span><a class="reference internal" href="cli-and-env-variables-ref.html#envvar-AIRFLOW__-SECTION-__-KEY"><code class="xref std std-envvar docutils literal notranslate"><span class="pre">AIRFLOW__{SECTION}__{KEY}</span></code></a></p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span><span class="nv">AIRFLOW__CORE__SQL_ALCHEMY_CONN</span><span class="o">=</span>my_conn_id
<span class="nv">AIRFLOW__WEBSERVER__BASE_URL</span><span class="o">=</span>http://host:port
</pre></div>
</div>
<p>Some configurations such as the Airflow Backend connection URI can be derived from bash commands as well:</p>
<div class="highlight-ini notranslate"><div class="highlight"><pre><span></span><span class="na">sql_alchemy_conn_cmd</span> <span class="o">=</span> <span class="s">bash_command_to_run</span>
</pre></div>
</div>
</div>
<div class="section" id="scheduler-uptime">
<h2>Scheduler Uptime<a class="headerlink" href="#scheduler-uptime" title="Permalink to this headline"></a></h2>
<p>Airflow users occasionally report instances of the scheduler hanging without a trace, for example in these issues:</p>
<ul class="simple">
<li><p><a class="reference external" href="https://github.com/apache/airflow/issues/7935">Scheduler gets stuck without a trace</a></p></li>
<li><p><a class="reference external" href="https://github.com/apache/airflow/issues/13243">Scheduler stopping frequently</a></p></li>
</ul>
<p>To mitigate these issues, make sure you have a <a class="reference internal" href="logging-monitoring/check-health.html"><span class="doc">health check</span></a> set up that will detect when your scheduler has not heartbeat in a while.</p>
</div>
<div class="section" id="production-container-images">
<span id="docker-image"></span><h2>Production Container Images<a class="headerlink" href="#production-container-images" title="Permalink to this headline"></a></h2>
<p>We provide <a class="reference external" href="/docs/docker-stack/index.html" title="(in docker-stack vdevel)"><span class="xref std std-doc">a Docker Image (OCI) for Apache Airflow</span></a> for use in a containerized environment. Consider using it to guarantee that software will always run the same no matter where it’s deployed.</p>
</div>
<div class="section" id="kerberos-authenticated-workers">
<span id="production-deployment-kerberos"></span><h2>Kerberos-authenticated workers<a class="headerlink" href="#kerberos-authenticated-workers" title="Permalink to this headline"></a></h2>
<p>Apache Airflow has a built-in mechanism for authenticating the operation with a KDC (Key Distribution Center).
Airflow has a separate command <code class="docutils literal notranslate"><span class="pre">airflow</span> <span class="pre">kerberos</span></code> that acts as token refresher. It uses the pre-configured
Kerberos Keytab to authenticate in the KDC to obtain a valid token, and then refreshing valid token
at regular intervals within the current token expiry window.</p>
<p>Each request for refresh uses a configured principal, and only keytab valid for the principal specified
is capable of retrieving the authentication token.</p>
<p>The best practice to implement proper security mechanism in this case is to make sure that worker
workloads have no access to the Keytab but only have access to the periodically refreshed, temporary
authentication tokens. This can be achieved in docker environment by running the <code class="docutils literal notranslate"><span class="pre">airflow</span> <span class="pre">kerberos</span></code>
command and the worker command in separate containers - where only the <code class="docutils literal notranslate"><span class="pre">airflow</span> <span class="pre">kerberos</span></code> token has
access to the Keytab file (preferably configured as secret resource). Those two containers should share
a volume where the temporary token should be written by the <code class="docutils literal notranslate"><span class="pre">airflow</span> <span class="pre">kerberos</span></code> and read by the workers.</p>
<p>In the Kubernetes environment, this can be realized by the concept of side-car, where both Kerberos
token refresher and worker are part of the same Pod. Only the Kerberos side-car has access to
Keytab secret and both containers in the same Pod share the volume, where temporary token is written by
the side-care container and read by the worker container.</p>
<p>This concept is implemented in the development version of the Helm Chart that is part of Airflow source code.</p>
</div>
<div class="section" id="secured-server-and-service-access-on-google-cloud">
<h2>Secured Server and Service Access on Google Cloud<a class="headerlink" href="#secured-server-and-service-access-on-google-cloud" title="Permalink to this headline"></a></h2>
<p>This section describes techniques and solutions for securely accessing servers and services when your Airflow
environment is deployed on Google Cloud, or you connect to Google services, or you are connecting
to the Google API.</p>
<div class="section" id="iam-and-service-accounts">
<h3>IAM and Service Accounts<a class="headerlink" href="#iam-and-service-accounts" title="Permalink to this headline"></a></h3>
<p>You should not rely on internal network segmentation or firewalling as our primary security mechanisms.
To protect your organization’s data, every request you make should contain sender identity. In the case of
Google Cloud, the identity is provided by
<a class="reference external" href="https://cloud.google.com/iam/docs/service-accounts">the IAM and Service account</a>. Each Compute Engine
instance has an associated service account identity. It provides cryptographic credentials that your workload
can use to prove its identity when making calls to Google APIs or third-party services. Each instance has
access only to short-lived credentials. If you use Google-managed service account keys, then the private
key is always held in escrow and is never directly accessible.</p>
<p>If you are using Kubernetes Engine, you can use
<a class="reference external" href="https://cloud.google.com/kubernetes-engine/docs/how-to/workload-identity">Workload Identity</a> to assign
an identity to individual pods.</p>
<p>For more information about service accounts in the Airflow, see <a class="reference external" href="/docs/apache-airflow-providers-google/stable/connections/gcp.html#howto-connection-gcp" title="(in apache-airflow-providers-google v5.1.0)"><span>Google Cloud Connection</span></a></p>
</div>
<div class="section" id="impersonate-service-accounts">
<h3>Impersonate Service Accounts<a class="headerlink" href="#impersonate-service-accounts" title="Permalink to this headline"></a></h3>
<p>If you need access to other service accounts, you can
<a class="reference external" href="/docs/apache-airflow-providers-google/stable/connections/gcp.html#howto-connection-gcp-impersonation" title="(in apache-airflow-providers-google v5.1.0)"><span class="xref std std-ref">impersonate other service accounts</span></a> to exchange the token with
the default identity to another service account. Thus, the account keys are still managed by Google
and cannot be read by your workload.</p>
<p>It is not recommended to generate service account keys and store them in the metadata database or the
secrets backend. Even with the use of the backend secret, the service account key is available for
your workload.</p>
</div>
<div class="section" id="access-to-compute-engine-instance">
<h3>Access to Compute Engine Instance<a class="headerlink" href="#access-to-compute-engine-instance" title="Permalink to this headline"></a></h3>
<p>If you want to establish an SSH connection to the Compute Engine instance, you must have the network address
of this instance and credentials to access it. To simplify this task, you can use
<a class="reference external" href="/docs/apache-airflow-providers-google/stable/_api/airflow/providers/google/cloud/hooks/compute/index.html#airflow.providers.google.cloud.hooks.compute.ComputeEngineHook" title="(in apache-airflow-providers-google v5.1.0)"><code class="xref py py-class docutils literal notranslate"><span class="pre">ComputeEngineHook</span></code></a>
instead of <a class="reference external" href="/docs/apache-airflow-providers-ssh/stable/_api/airflow/providers/ssh/hooks/ssh/index.html#airflow.providers.ssh.hooks.ssh.SSHHook" title="(in apache-airflow-providers-ssh v2.1.1)"><code class="xref py py-class docutils literal notranslate"><span class="pre">SSHHook</span></code></a></p>
<p>The <a class="reference external" href="/docs/apache-airflow-providers-google/stable/_api/airflow/providers/google/cloud/hooks/compute/index.html#airflow.providers.google.cloud.hooks.compute.ComputeEngineHook" title="(in apache-airflow-providers-google v5.1.0)"><code class="xref py py-class docutils literal notranslate"><span class="pre">ComputeEngineHook</span></code></a> support authorization with
Google OS Login service. It is an extremely robust way to manage Linux access properly as it stores
short-lived ssh keys in the metadata service, offers PAM modules for access and sudo privilege checking
and offers the <code class="docutils literal notranslate"><span class="pre">nsswitch</span></code> user lookup into the metadata service as well.</p>
<p>It also solves the discovery problem that arises as your infrastructure grows. You can use the
instance name instead of the network address.</p>
</div>
<div class="section" id="access-to-amazon-web-service">
<h3>Access to Amazon Web Service<a class="headerlink" href="#access-to-amazon-web-service" title="Permalink to this headline"></a></h3>
<p>Thanks to the
<a class="reference external" href="https://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles_providers_oidc.html">Web Identity Federation</a>,
you can exchange the Google Cloud Platform identity to the Amazon Web Service identity,
which effectively means access to Amazon Web Service platform.
For more information, see: <a class="reference external" href="/docs/apache-airflow-providers-amazon/stable/connections/aws.html#howto-connection-aws-gcp-federation" title="(in apache-airflow-providers-amazon v2.2.0)"><span>Google Cloud to AWS authentication using Web Identity Federation</span></a></p>
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