249 lines
8.1 KiB
ReStructuredText
249 lines
8.1 KiB
ReStructuredText
.. _kubernetes-driver:
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.. default-domain:: zuul
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Kubernetes Driver
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-----------------
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Selecting the kubernetes driver adds the following options to the
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:attr:`providers` section of the configuration.
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.. attr-overview::
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:prefix: providers.[kubernetes]
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:maxdepth: 3
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.. attr:: providers.[kubernetes]
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:type: list
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A Kubernetes provider's resources are partitioned into groups
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called `pools` (see :attr:`providers.[kubernetes].pools` for
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details), and within a pool, the node types which are to be made
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available are listed (see :attr:`providers.[kubernetes].pools.labels` for
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details).
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.. note:: For documentation purposes the option names are prefixed
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``providers.[kubernetes]`` to disambiguate from other
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drivers, but ``[kubernetes]`` is not required in the
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configuration (e.g. below
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``providers.[kubernetes].pools`` refers to the ``pools``
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key in the ``providers`` section when the ``kubernetes``
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driver is selected).
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Example:
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.. code-block:: yaml
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providers:
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- name: kubespray
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driver: kubernetes
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context: admin-cluster.local
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pools:
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- name: main
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labels:
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- name: kubernetes-namespace
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type: namespace
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- name: pod-fedora
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type: pod
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image: docker.io/fedora:28
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.. attr:: context
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Name of the context configured in ``kube/config``.
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Before using the driver, Nodepool either needs a ``kube/config``
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file installed with a cluster admin context, in which case this
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setting is required, or if Nodepool is running inside
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Kubernetes, this setting and the ``kube/config`` file may be
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omitted and Nodepool will use a service account loaded from the
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in-cluster configuration path.
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.. attr:: launch-retries
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:default: 3
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The number of times to retry launching a node before considering
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the job failed.
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.. attr:: pools
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:type: list
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A pool defines a group of resources from a Kubernetes
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provider.
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.. attr:: name
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:required:
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Namespaces are prefixed with the pool's name.
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.. attr:: priority
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:type: int
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:default: 100
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The priority of this provider pool (a lesser number is a higher
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priority). Nodepool launchers will yield requests to other
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provider pools with a higher priority as long as they are not
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paused. This means that in general, higher priority pools will
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reach quota first before lower priority pools begin to be used.
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This setting may be specified at the provider level in order
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to apply to all pools within that provider, or it can be
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overridden here for a specific pool.
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.. attr:: node-attributes
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:type: dict
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A dictionary of key-value pairs that will be stored with the node data
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in ZooKeeper. The keys and values can be any arbitrary string.
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.. attr:: max-cores
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:type: int
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Maximum number of cores usable from this pool. This can be used
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to limit usage of the kubernetes backend. If not defined nodepool can
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use all cores up to the limit of the backend.
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.. attr:: max-servers
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:type: int
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Maximum number of pods spawnable from this pool. This can
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be used to limit the number of pods. If not defined
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nodepool can create as many servers the kubernetes backend allows.
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.. attr:: max-ram
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:type: int
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Maximum ram usable from this pool. This can be used to limit
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the amount of ram allocated by nodepool. If not defined
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nodepool can use as much ram as the kubernetes backend allows.
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.. attr:: default-label-cpu
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:type: int
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Only used by the
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:value:`providers.[kubernetes].pools.labels.type.pod` label type;
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specifies specifies a default value for
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:attr:`providers.[kubernetes].pools.labels.cpu` for all labels of
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this pool that do not set their own value.
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.. attr:: default-label-memory
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:type: int
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Only used by the
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:value:`providers.[kubernetes].pools.labels.type.pod` label type;
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specifies a default value for
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:attr:`providers.[kubernetes].pools.labels.memory` for all labels of
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this pool that do not set their own value.
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.. attr:: labels
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:type: list
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Each entry in a pool`s `labels` section indicates that the
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corresponding label is available for use in this pool.
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Each entry is a dictionary with the following keys
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.. attr:: name
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:required:
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Identifier for this label; references an entry in the
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:attr:`labels` section.
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.. attr:: type
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The Kubernetes provider supports two types of labels:
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.. value:: namespace
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Namespace labels provide an empty namespace configured
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with a service account that can create pods, services,
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configmaps, etc.
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.. value:: pod
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Pod labels provide a dedicated namespace with a single pod
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created using the
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:attr:`providers.[kubernetes].pools.labels.image` parameter and it
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is configured with a service account that can exec and get
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the logs of the pod.
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.. attr:: image
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Only used by the
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:value:`providers.[kubernetes].pools.labels.type.pod` label type;
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specifies the image name used by the pod.
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.. attr:: image-pull
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:default: IfNotPresent
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:type: str
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The ImagePullPolicy, can be IfNotPresent, Always or Never.
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.. attr:: python-path
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:type: str
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:default: auto
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The path of the default python interpreter. Used by Zuul to set
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``ansible_python_interpreter``. The special value ``auto`` will
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direct Zuul to use inbuilt Ansible logic to select the
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interpreter on Ansible >=2.8, and default to
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``/usr/bin/python2`` for earlier versions.
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.. attr:: shell-type
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:type: str
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:default: sh
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The shell type of the node's default shell executable. Used by Zuul
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to set ``ansible_shell_type``. This setting should only be used
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- For a windows pod with the experimental `connection-type`
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``ssh``, in which case ``cmd`` or ``powershell`` should be set
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and reflect the node's ``DefaultShell`` configuration.
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- If the default shell is not Bourne compatible (sh), but instead
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e.g. ``csh`` or ``fish``, and the user is aware that there is a
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long-standing issue with ``ansible_shell_type`` in combination
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with ``become``
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.. attr:: cpu
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:type: int
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Only used by the
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:value:`providers.[kubernetes].pools.labels.type.pod` label type;
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specifies the number of cpu to request for the pod.
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.. attr:: memory
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:type: int
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Only used by the
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:value:`providers.[kubernetes].pools.labels.type.pod` label type;
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specifies the amount of memory in MB to request for the pod.
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.. attr:: env
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:type: list
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:default: []
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Only used by the
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:value:`providers.[kubernetes].pools.labels.type.pod` label type;
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A list of environment variables to pass to the Pod.
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.. attr:: name
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:type: str
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:required:
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The name of the environment variable passed to the Pod.
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.. attr:: value
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:type: str
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:required:
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The value of the environment variable passed to the Pod.
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.. attr:: node-selector
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:type: dict
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Only used by the
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:value:`providers.[kubernetes].pools.labels.type.pod` label type;
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A map of key-value pairs to ensure the Kubernetes scheduler
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places the Pod on a node with specific node labels.
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