nodepool/doc/source/static.rst

.. _static-driver:

.. default-domain:: zuul

Static Driver
-------------

Selecting the static driver adds the following options to the
:attr:`providers` section of the configuration.

.. attr-overview::
   :prefix: providers.[static]
   :maxdepth: 3

.. attr:: providers.[static]
   :type: list

   The static provider driver is used to define static nodes.

   .. note:: For documentation purposes the option names are prefixed
             ``providers.[static]`` to disambiguate from other
             drivers, but ``[static]`` is not required in the
             configuration (e.g. below ``providers.[static].pools``
             refers to the ``pools`` key in the ``providers`` section
             when the ``static`` driver is selected).

   Example:

   .. code-block:: yaml

      providers:
        - name: static-rack
          driver: static
          pools:
            - name: main
              nodes:
                - name: trusty.example.com
                  labels: trusty-static
                  timeout: 13
                  connection-port: 22022
                  host-key: fake-key
                  username: zuul
                  max-parallel-jobs: 1

   .. attr:: pools
      :type: list

      A pool defines a group of statically declared nodes.

      .. note::

         When providing different labels, it is better to have one pool per
         label to avoid requests being queued when one label is at capacity.

      Each entry is a dictionary with entries as follows

      .. attr:: name
         :type: str
         :required:

         Pool name

      .. attr:: priority
         :type: int
         :default: 100

         The priority of this provider pool (a lesser number is a higher
         priority).  Nodepool launchers will yield requests to other
         provider pools with a higher priority as long as they are not
         paused.  This means that in general, higher priority pools will
         reach quota first before lower priority pools begin to be used.

         This setting may be specified at the provider level in order
         to apply to all pools within that provider, or it can be
         overridden here for a specific pool.

      .. attr:: node-attributes
         :type: dict

         A dictionary of key-value pairs that will be stored with the node data
         in ZooKeeper. The keys and values can be any arbitrary string.

      .. attr:: nodes
         :type: list
         :required:

         Each entry indicates a static node and it's attributes.

         .. attr:: name
            :type: str
            :required:

            The hostname or ip address of the static node. The combination of
            ``name``, :attr:`providers.[static].pools.nodes.username`, and
            :attr:`providers.[static].pools.nodes.connection-port`
            must be unique across all nodes defined within the configuration
            file.

         .. attr:: labels
            :type: list
            :required:

            The list of labels associated with the node.

         .. attr:: host-key-checking
            :type: bool
            :default: True

            Whether to validate SSH host keys.  When true, this helps ensure
            that nodes are ready to receive SSH connections before they are
            supplied to the requestor.  When set to false, nodepool-launcher
            will not attempt to ssh-keyscan nodes after they are booted.
            Disable this if nodepool-launcher and the nodes it launches are
            on different networks, where the launcher is unable to reach the
            nodes directly, or when using Nodepool with non-SSH node
            platforms.  The default value is true.

         .. attr:: timeout
            :type: int
            :default: 5

            The timeout in second before the ssh ping is considered failed.

         .. attr:: connection-type
            :type: string
            :default: ssh

            The connection type that a consumer should use when connecting
            to the node.

            .. value:: winrm

            .. value:: ssh

         .. attr:: connection-port
            :type: int
            :default: 22 / 5986

            The port that a consumer should use when connecting to the node.
            For most nodes this is not necessary. This defaults to 22 when
            ``connection-type`` is 'ssh' and 5986 when it is 'winrm'.

         .. attr:: host-key
            :type: str

            The ssh host key of the node.

         .. attr:: username
            :type: str
            :default: zuul

            The username nodepool will use to validate it can connect to the
            node.

         .. attr:: python-path
            :type: str
            :default: /usr/bin/python2

            The path of the default python interpreter.  Used by Zuul to set
            ``ansible_python_interpreter``.  The special value ``auto`` will
            direct Zuul to use inbuilt Ansible logic to select the
            interpreter on Ansible >=2.8, and default to
            ``/usr/bin/python2`` for earlier versions.

         .. attr:: shell-type
            :type: str
            :default: sh

            The shell type of the node's default shell executable. Used by Zuul
            to set ``ansible_shell_type``. This setting should only be used

            - For a windows node with the experimental `connection-type`
              ``ssh``, in which case ``cmd`` or ``powershell`` should be set
              and reflect the node's ``DefaultShell`` configuration.
            - If the default shell is not Bourne compatible (sh), but instead
              e.g. ``csh`` or ``fish``, and the user is aware that there is a
              long-standing issue with ``ansible_shell_type`` in combination
              with ``become``

         .. attr:: max-parallel-jobs
            :type: int
            :default: 1

            The number of jobs that can run in parallel on this node.