617 lines
18 KiB
ReStructuredText
617 lines
18 KiB
ReStructuredText
Zuul Operator
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=============
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This is a Kubernetes Operator for the Zuul Project Gating System.
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Zuul has a number of components and depencencies, and this operator is
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designed to simplify creating and maintaining Zuul systems in
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Kubernetes.
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Somewhat unusually, this operator offers the ability to completely
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manage Zuul's operational dependencies, to the point of even
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installing other operators upon which it relies. Be sure to read
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about deployment options if you want to perform some of these tasks
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yourself.
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Simple Example
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--------------
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The quickest way to get a running Zuul is to allow the operator to
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manage all of the dependencies for you. In this case, the operator
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will:
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* Install cert-manager and set up a self-signed cluster issuer
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* Install the Percona XtraDB operator and create a three-node PXC
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database cluster
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* Create a three-node ZooKeeper cluster
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* And of course, create a Zuul system
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.. note::
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Installing other operators requires a high level of access, so when
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used in this manner, zuul-operator runs with cluster admin
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privileges. If you would like the operator to run with reduced
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privileges, see Managing Operator Dependencies.
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From the root of the zuul-operator repo, run:
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.. code-block:: bash
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kubectl apply -f deploy/crds/zuul-ci_v1alpha1_zuul_crd.yaml
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kubectl apply -f deploy/rbac-admin.yaml
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kubectl apply -f deploy/operator.yaml
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You probably want a namespace, so go ahead and create one with:
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.. code-block:: bash
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kubectl create namespace zuul
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You will need to prepare two config files for Zuul: the Nodepool
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config file and the Zuul tenant config file. See the Zuul and
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Nodepool manuals for how to prepare those. When they are ready, add
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them to Kubernetes with commands like:
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.. code-block:: bash
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kubectl -n zuul create secret generic zuul-nodepool-config --from-file=nodepool.yaml
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kubectl -n zuul create secret generic zuul-tenant-config --from-file=main.yaml
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Then create a file called ``zuul.yaml`` which looks like:
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.. code-block:: yaml
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---
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apiVersion: operator.zuul-ci.org/v1alpha2
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kind: Zuul
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metadata:
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name: zuul
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spec:
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executor:
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count: 1
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sshkey:
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secretName: gerrit-secrets
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scheduler:
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config:
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secretName: zuul-tenant-config
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launcher:
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config:
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secretName: zuul-nodepool-config
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web:
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count: 1
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connections:
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opendev:
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driver: git
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baseurl: https://opendev.org
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This will create the most basic of Zuul installations, with one each
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of the `zuul-executor`, `zuul-scheduler`, and `zuul-web` processes.
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It will also create a Nodepool launcher for each of the providers
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listed in your ``nodepool.yaml``. If your Zuul tenant config file
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requires more connections, be sure to add them here.
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Managing Operator Dependencies
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------------------------------
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You may not want zuul-operator to install other operators (for
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example, if your cluster has other users and you don't want
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cert-manager or pxc-operator to be tied to a Zuul installation, or if
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you would prefer to avoid granting zuul-operator cluster admin
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privileges). In that case, you may install the other operators
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yourself and still allow zuul-operator to use those other operators.
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It can still create a PXC cluster for you as long as the pxc-operator
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is present.
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To use this mode of operation, make sure the following dependencies
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are installed before using zuul-operator:
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* Cert-manager (at least version 1.2.0)
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* Percona-xtradb-cluster-operator (at least version 1.7.0)
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With these installed, you may install zuul-operator with reduced
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privileges:
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.. code-block:: bash
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kubectl apply -f deploy/crds/zuul-ci_v1alpha1_zuul_crd.yaml
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kubectl apply -f deploy/rbac.yaml
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kubectl apply -f deploy/operator.yaml
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After this point, usage is the same as other methods.
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Externally Managed Zuul Dependencies
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------------------------------------
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If you want zuul-operator to do even less work, you can have it avoid
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managing either ZooKeeper or the SQL database.
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Externally Managed ZooKeeper
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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If you already have a ZooKeeper instance you would like Zuul to use,
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add the following to the `Zuul` spec:
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.. code-block:: yaml
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---
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apiVersion: operator.zuul-ci.org/v1alpha2
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kind: Zuul
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spec:
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zookeeper:
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connectionString: ...
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secretName: ...
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The ``connectionString`` field should be a standard ZooKeeper
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connection string, and the ``secretName`` field should be a Kubernetes
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TLS secret with the client cert for Zuul to use when connecting to
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ZooKeeper. TLS is required.
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Externally Managed Database
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~~~~~~~~~~~~~~~~~~~~~~~~~~~
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If you would like to use an existing database, add the following to
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the `Zuul` spec:
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.. code-block:: yaml
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---
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apiVersion: operator.zuul-ci.org/v1alpha2
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kind: Zuul
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spec:
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database:
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dburi: ...
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The ``dburi`` field should contain a Python db-api URI; it corresponds
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to the ``dburi`` entry in ``zuul.conf``.
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Secrets
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-------
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The operator uses Kubernetes secrets as input values for several
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aspects of operation. There are some general rules about how secrets
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are used:
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* For configuration files, secret keys are expected to be the typical
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filename (for example, ``nodepool.yaml`` for the Nodepool config
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file).
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* For Zuul connection entries, secret keys correspond to the
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configuration file attributes for that section (e.g., ``app_key``
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for the github driver).
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See the reference documentation for the specific `secretName` entry
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for details.
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Zuul Preview
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------------
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The operator has optional support for deploying a zuul-preview
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service. This is an experimental add-on for Zuul to serve Zuul
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artifacts from the root of a domain (this can be useful for serving
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static HTML/Javascript sites). If you enable this, the operator will
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configure a ``zuul-preview`` service to which you may route an Ingress
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or LoadBalancer.
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Zuul Registry
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-------------
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The operator has optional support for deploying a zuul-registry
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service. This is an experimental add-on for Zuul to act as an
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intermediate registry for the container image jobs in `zuul-jobs`.
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If you enable this, the operator will, by default, configure a
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``zuul-registry`` service in a manner appropriate for access from
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within the cluster only. If you need to access the registry from
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outside the cluster, you will need to additionally add an Ingress or
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LoadBalancer, as well as provide TLS certs with the appropriate
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hostname. Currently, zuul-registry performs its own TLS termination.
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If you usue this, you will also need to provide a ``registry.yaml``
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config file in a secret. You only need to provide the ``users`` and,
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if you are accessing the registry outside the cluster, the
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``public-url`` setting (omit it if you are accessing it from within
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the cluster only).
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.. code-block:: yaml
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registry:
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users:
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- name: testuser
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pass: testpass
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access: write
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Specification Reference
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-----------------------
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This is a fully populated example (with the exception of connection
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entries which can contain `zuul.conf` attributes passed through
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verbatim):
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.. code-block:: yaml
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apiVersion: zuul-ci.org/v1alpha2
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kind: Zuul
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spec:
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database:
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secretName: mariadbSecret
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zookeeper:
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hosts: zk.example.com:2282
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secretName: zookeeperTLS
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merger:
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count: 5
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git_user_email: zuul@example.org
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git_user_name: Example Zuul
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executor:
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count: 5
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manage_ansible: false
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web:
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count: 1
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status_url: https://zuul.example.org
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fingergw:
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count: 1
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scheduler:
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count: 1
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connections:
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gerrit:
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driver: gerrit
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server: gerrit.example.com
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secretName: gerritSecrets
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user: zuul
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baseurl: http://gerrit.example.com:8080
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github:
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driver: github
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secretName: githubSecrets
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rate_limit_logging: false
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app_id: 1234
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jobVolumes:
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- context: trusted
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access: ro
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path: /authdaemon/token
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volume:
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name: gcp-auth
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hostPath:
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path: /var/authdaemon/executor
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type: DirectoryOrCreate
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.. attr:: Zuul
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The Zuul kind is currently the only resource directly handled by
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the operator. It holds a complete description of a Zuul system
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(though at least partly via secrets referenced by this resource).
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.. attr:: spec
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.. attr:: imagePrefix
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:default: docker.io/zuul
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The prefix to use for images. The image names are fixed
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(``zuul-executor``, etc). However, changing the prefix will
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allow you to use custom images or private registries.
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.. attr:: zuulImageVersion
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:default: latest
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The image tag to append to the Zuul images.
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.. attr:: zuulPreviewImageVersion
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:default: latest
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The image tag to append to the Zuul Preview images.
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.. attr:: nodepoolImageVersion
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:default: latest
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The image tag to append to the Nodepool images.
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.. attr:: database
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This is not required unless you want to manage the database
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yourself. If you omit this section, zuul-operator will
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create a Percona XtraDB cluster for you.
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You may add any attribute corresponding to the `database`
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section of zuul.conf here. The ``dburi`` attribute will come
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from the secret below.
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.. attr:: secretName
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The name of a secret containing connection information for
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the database.
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The key name in the secret should be ``dburi``.
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.. attr:: allowUnsafeConfig
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:default: False
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If you are running in a resource constrained environment
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(such as minikube), the requested resource values for the
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Percona XtraDB may be too large. Set this to True to
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override the default values and construct the cluster
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regardless. Only use this for testing.
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.. attr:: zookeeper
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This is not required unless you want to manage the ZooKeeper
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cluster yourself. If you omit this section, zuul-operator
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will create a ZooKeeper cluster for you
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You may add any attribute corresponding to the `zookeeper`
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section of zuul.conf here. The ``hosts`` and TLS attributes
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will come from the secret below.
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.. attr:: hosts
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A standard ZooKeeper connection string.
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.. attr:: secretName
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The name of a secret containing a TLS client certificate
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and key for ZooKeeper. This should be (or the format
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should match) a standard Kubernetes TLS secret.
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The key names in the secret should be:
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* ``ca.crt``
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* ``tls.crt``
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* ``tls.key``
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.. attr:: env
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A list of environment variables. This will be passed through
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to the Pod specifications for the scheduler, launcher, and
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web. This may be used to set http_proxy environment
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variables.
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.. attr:: scheduler
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.. attr:: config
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.. attr:: secretName
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The name of a secret containing the Zuul tenant config
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file.
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The key name in the secret should be ``main.yaml``.
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.. attr:: launcher
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.. attr:: config
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.. attr:: secretName
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The name of a secret containing the Nodepool config
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file.
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The key name in the secret should be ``nodepool.yaml``.
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.. attr:: executor
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.. attr:: count
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:default: 1
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How many executors to manage. This is a required
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component and should be at least 1.
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.. attr:: sshkey
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.. attr:: secretName
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The name of a secret containing the SSH private key
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that executors should use when logging into Nodepool
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nodes. You will need to arrange for the public half of
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this key to be installed on those nodes via whatever
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mechanism provided by your cloud.
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The key name in the secret should be ``sshkey``.
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.. attr:: terminationGracePeriodSeconds
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:default: 21600
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When performing a rolling restart of the executors, wait
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this long for jobs to finish normally. If an executor
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takes longer than this amount of time, it will be
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hard-stopped (and jobs will abort and retry). The default
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is 6 hours, but depending on the workload, a higher or
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lower value may be appropriate.
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.. attr:: merger
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.. attr:: count
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:default: 0
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How many mergers to manage. Executors also act as mergers
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so this is not required. They may be useful on a busy
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system.
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.. attr:: web
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.. attr:: count
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:default: 1
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How many Zuul webservers to manage. This is a required
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component and should be at least 1.
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.. attr:: fingergw
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.. attr:: count
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:default: 1
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How many Zuul finger gateway servers to manage.
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.. attr:: connections
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This is a mapping designed to match the `connections` entries
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in the main Zuul config file (`zuul.conf`). Each key in the
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mapping is the name of a connection (this is the name you
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will use in the tenant config file), and the values are
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key/value pairs that are directly added to that connectien
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entry in `zuul.conf`. In the case of keys which are
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typically files (for example, SSH keys), the values will be
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written to disk for you (so you should include the full
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values here and not the path).
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You may provide any of these values directly in this resource
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or using the secret described below. You may use both, and
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the values will be combined (for example, you may include all
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the values here except a private key which you include in a
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secret).
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Example:
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.. code-block:: yaml
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connections:
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opendev:
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driver: git
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baseurl: https://opendev.org
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gerrit:
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driver: git
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baseurl: https://gerrit.examplec.mo
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secretName: gerrit-secrets
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.. attr:: <name>
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The name of the connection. You will use this is the
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tenant config file. All of the attributes describing this
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connection should be included underneath this key.
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.. attr:: secretName
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The name of a secret describing this connection. All
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of the keys and values in this secret will be merged
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with the keys and values described in this connection
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entry. If you need to provide a file (for example, the
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``sshkey`` attribute of a Gerrit connection), include
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the contents as the value of the ``sshkey`` attribute
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in the secret.
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.. attr:: externalConfig
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A mapping of secrets for specific Nodepool drivers. Some
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Nodepool drivers use external files for configuration (e.g.,
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`clouds.yaml` for OpenStack). To provide these to Nodepool,
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add them to a secret and specify the name of that secret in
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an entry in externalConfig.
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For example, a secret for OpenStack might look like:
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.. code-block:: yaml
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apiVersion: v1
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kind: Secret
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metadata:
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name: openstack-secret
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stringData:
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clouds.yaml: "..."
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To use that with Nodepool, add the following to the Operator
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resource definition:
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.. code-block:: yaml
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externalConfig:
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openstack:
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secretName: openstack-secret
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This will cause a `clouds.yaml` file to be created at
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`/etc/openstack/clouds.yaml`.
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Some Nodepool drivers may need environment variables set in
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order to use these secrets. See :attr:`Zuul.spec.env` to add
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those.
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The keys in this mapping will become directories under
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`/etc/`, and the secrets referenced will be mounted in those
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directories.
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.. attr:: <name>
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The directory to mount under `/etc`.
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.. attr:: SecretName
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The name of a secret that should be mounted at `/etc/<name>`.
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.. attr:: jobVolumes
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A list of Kubernetes volumes to be bind mounted into the
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executor's execution context. These correspond to the
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`trusted_ro_paths`, `untrusted_ro_paths`, `trusted_rw_paths`,
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and `untrusted_ro_paths` entries in `zuul.conf`.
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The first part of each entry describes how the volume should
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appear in the executor, and the `volume` attribute describes
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the Kubernetes volume.
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.. attr:: context
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One of the following values:
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.. value:: trusted
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To be mounted in the `trusted` execution context.
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.. value:: untrusted
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To be mounted in the `untrusted` execution context.
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.. attr:: access
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One of the following values:
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.. value:: rw
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To be mounted read/write.
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.. value:: ro
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To be mounted read-only.
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.. attr:: path
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The mount point within the execution context.
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.. attr:: volume
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A mapping corresponding to a Kubernetes volume.
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.. attr:: preview
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.. attr:: count
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:default: 0
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How many Zuul Preview servers to manage.
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.. attr:: registry
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.. attr:: count
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:default: 0
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How many Zuul Registry servers to manage.
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.. attr:: volumeSize
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:default: 80Gi
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The requested size of the registry storage volume.
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.. attr:: tls
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.. attr:: secretName
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The name of a secret containing a TLS client certificate
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and key for Zuul Registry. This should be (or the format
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should match) a standard Kubernetes TLS secret.
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If you omit this, the operator will create a secret for
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you.
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.. attr:: config
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.. attr:: secretName
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The name of a secret containing a registry
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configuration file. The key in the secret should be
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``registry.yaml``. Only provide the ``users`` and, if
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exposing the registry outside the cluster, the
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``public-url`` entries.
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