HostSystem
==========

Sample Document to run containers in Docker runtime
---------------------------------------------------

.. code-block:: yaml

    schema: promenade/HostSystem/v1
    metadata:
      schema: metadata/Document/v1
      name: host-system
      layeringDefinition:
        abstract: false
        layer: site
    data:
      files:
        - path: /opt/kubernetes/bin/kubelet
          tar_url: https://dl.k8s.io/v1.20.5/kubernetes-node-linux-amd64.tar.gz
          tar_path: kubernetes/node/bin/kubelet
          mode: 0555
      images:
        haproxy: haproxy:1.8.3
        helm:
          helm: lachlanevenson/k8s-helm:v2.14.0
        monitoring_image: busybox:1.28.3
      packages:
        repositories:
          - deb [arch=amd64] https://download.docker.com/linux/ubuntu bionic stable
        keys:
          - |-
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            -----END PGP PUBLIC KEY BLOCK-----
        additional:
          - curl
          - jq
          - chrony
        required:
          runtime: docker-ce=5:19.03.8~3-0~ubuntu-bionic
          socat: socat=1.7.3.1-1


Sample Document to run containers in Containerd runtime
-------------------------------------------------------

.. code-block:: yaml

    schema: promenade/HostSystem/v1
    metadata:
      schema: metadata/Document/v1
      name: host-system
      layeringDefinition:
        abstract: false
        layer: site
    data:
      files:
        - path: /opt/kubernetes/bin/kubelet
          tar_url: https://dl.k8s.io/v1.20.5/kubernetes-node-linux-amd64.tar.gz
          tar_path: kubernetes/node/bin/kubelet
          mode: 0555
      images:
        haproxy: haproxy:1.8.3
        helm:
          helm: lachlanevenson/k8s-helm:v2.14.0
        monitoring_image: busybox:1.28.3
      packages:
        additional:
          - curl
          - jq
          - chrony
        required:
          runtime: containerd
          socat: socat=1.7.3.1-1


Files
-----

A list of files to be written to the host.  Files can be given as precise
content, extracted from a tarball specified by url, or downloaded from a url:

.. code-block:: yaml

    - path: /etc/direct-content
      content: |-
        This
        exact
        text
    - path: /etc/from-tar
      tar_url: http://example.com/file.tgz
      tar_source: dir/file.txt
    - path: /etc/from-url
      url: http://example.com/file

Images
------

Core Images
^^^^^^^^^^^

These images are used for essential functionality:

``haproxy``
    HAProxy_ is configured and used for Kubernetes API discovery during
    bootstrapping.

``kubectl``
    Used for label application and validation tasks during bootstrapping.

.. _HAProxy: https://www.haproxy.org/


Convenience Images
^^^^^^^^^^^^^^^^^^

The ``helm`` image is available for convenience.


Packages
--------

Repository Configuration
^^^^^^^^^^^^^^^^^^^^^^^^

Additional APT repositories can be configured using the ``repositories`` and
``keys`` fields of the ``SystemPackages`` document:

``repositories``
    A list of APT source lines to be configured during genesis or join.

``keys``
    A list of public PGP keys that can be used to verify installed packages.


Package Configuration
^^^^^^^^^^^^^^^^^^^^^

The ``required`` key specifies packages that are required for all deployments,
and the ``additional`` key allows arbitrary additional system packages to be
installed.  The ``additional`` key is particularly useful for installing
packages such as `ceph-common`.