zuul/nodepool
Code Issues Proposed changes
de24f25e58
nodepool/doc/source/configuration.rst
James E. Blair baa831192f Store build logs automatically 
This updates the builder to store individual build logs in dedicated
files, one per build, named for the image and build id.  Old logs are
automatically pruned.  By default, they are stored in
/var/log/nodepool/builds, but this can be changed.

This removes the need to specially configure logging handler for the
image build logs.

Change-Id: Ia7415d2fbbb320f8eddc4e46c3a055414df5f997
2018-02-09 07:50:20 -08:00

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.. _configuration:
Configuration
=============
Nodepool reads its configuration from ``/etc/nodepool/nodepool.yaml``
by default. The configuration file follows the standard YAML syntax
with a number of sections defined with top level keys. For example, a
full configuration file may have the ``diskimages``, ``labels``,
and ``providers`` sections::
diskimages:
...
labels:
...
providers:
...
.. note:: The builder daemon creates a UUID to uniquely identify itself and
to mark image builds in ZooKeeper that it owns. This file will be
named ``builder_id.txt`` and will live in the directory named by the
:ref:`images-dir` option. If this file does not exist, it will be
created on builder startup and a UUID will be created automatically.
The following sections are available. All are required unless
otherwise indicated.
.. _webapp-conf:
webapp
------
Define the webapp endpoint port and listen address.
Example::
webapp:
port: 8005
listen_address: '0.0.0.0'
.. _elements-dir:
elements-dir
------------
If an image is configured to use diskimage-builder and glance to locally
create and upload images, then a collection of diskimage-builder elements
must be present. The ``elements-dir`` parameter indicates a directory
that holds one or more elements.
Example::
elements-dir: /path/to/elements/dir
.. _images-dir:
images-dir
----------
When we generate images using diskimage-builder they need to be
written to somewhere. The ``images-dir`` parameter is the place to
write them.
Example::
images-dir: /path/to/images/dir
.. _build-log-dir:
build-log-dir
-------------
The builder will store build logs in this directory. It will create
one file for each build, named `<image>-<build-id>.log`; for example,
`fedora-0000000004.log`. It defaults to ``/var/log/nodepool/builds``.
Example::
build-log-dir: /path/to/log/dir
.. _build-log-retention:
build-log-retention
-------------------
At the start of each build, the builder will remove old build logs if
they exceed a certain number. This option specifies how many will be
kept (usually you will see one more, as deletion happens before
starting a new build). By default, the last 7 old build logs are
kept.
Example::
build-log-retention: 14
zookeeper-servers
-----------------
Lists the ZooKeeper servers uses for coordinating information between
nodepool workers. Example::
zookeeper-servers:
- host: zk1.example.com
port: 2181
chroot: /nodepool
The ``port`` key is optional (default: 2181).
The ``chroot`` key, used for interpreting ZooKeeper paths relative to
the supplied root path, is also optional and has no default.
.. _labels:
labels
------
Defines the types of nodes that should be created. Jobs should be
written to run on nodes of a certain label. Example::
labels:
- name: my-precise
max-ready-age: 3600
min-ready: 2
- name: multi-precise
min-ready: 2
**required**
``name``
Unique name used to tie jobs to those instances.
**optional**
``max-ready-age`` (int)
Maximum number of seconds the node shall be in ready state. If
this is exceeded the node will be deleted. A value of 0 disables this.
Defaults to 0.
``min-ready`` (default: 0)
Minimum number of instances that should be in a ready
state. Nodepool always creates more nodes as necessary in response
to demand, but setting ``min-ready`` can speed processing by
attempting to keep nodes on-hand and ready for immedate use.
``min-ready`` is best-effort based on available capacity and is
not a guaranteed allocation. The default of 0 means that nodepool
will only create nodes of this label when there is demand. Set
to -1 to have the label considered disabled, so that no nodes will
be created at all.
.. _diskimages:
diskimages
----------
This section lists the images to be built using diskimage-builder. The
name of the diskimage is mapped to the :ref:`provider_diskimages` section
of the provider, to determine which providers should received uploads of each
image. The diskimage will be built in every format required by the
providers with which it is associated. Because Nodepool needs to know
which formats to build, if the diskimage will only be built if it
appears in at least one provider.
To remove a diskimage from the system entirely, remove all associated
entries in :ref:`provider_diskimages` and remove its entry from `diskimages`.
All uploads will be deleted as well as the files on disk.
Example configuration::
diskimages:
- name: ubuntu-precise
pause: False
rebuild-age: 86400
elements:
- ubuntu-minimal
- vm
- simple-init
- openstack-repos
- nodepool-base
- cache-devstack
- cache-bindep
- growroot
- infra-package-needs
release: precise
username: zuul
env-vars:
TMPDIR: /opt/dib_tmp
DIB_CHECKSUM: '1'
DIB_IMAGE_CACHE: /opt/dib_cache
DIB_APT_LOCAL_CACHE: '0'
DIB_DISABLE_APT_CLEANUP: '1'
FS_TYPE: ext3
- name: ubuntu-xenial
pause: True
rebuild-age: 86400
formats:
- raw
- tar
elements:
- ubuntu-minimal
- vm
- simple-init
- openstack-repos
- nodepool-base
- cache-devstack
- cache-bindep
- growroot
- infra-package-needs
release: precise
username: ubuntu
env-vars:
TMPDIR: /opt/dib_tmp
DIB_CHECKSUM: '1'
DIB_IMAGE_CACHE: /opt/dib_cache
DIB_APT_LOCAL_CACHE: '0'
DIB_DISABLE_APT_CLEANUP: '1'
FS_TYPE: ext3
**required**
``name``
Identifier to reference the disk image in :ref:`provider_diskimages`
and :ref:`labels`.
**optional**
``formats`` (list)
The list of formats to build is normally automatically created based on the
needs of the providers to which the image is uploaded. To build images even
when no providers are configured or to build additional formats which you
know you may need in the future, list those formats here.
``rebuild-age``
If the current diskimage is older than this value (in seconds),
then nodepool will attempt to rebuild it. Defaults to 86400 (24
hours).
``release``
Specifies the distro to be used as a base image to build the image using
diskimage-builder.
``elements`` (list)
Enumerates all the elements that will be included when building the image,
and will point to the :ref:`elements-dir` path referenced in the same
config file.
``env-vars`` (dict)
Arbitrary environment variables that will be available in the spawned
diskimage-builder child process.
``pause`` (bool)
When set to True, nodepool-builder will not build the diskimage.
``username`` (string)
The username that a consumer should use when connecting onto the node. Defaults
to ``zuul``.
.. _provider:
providers
---------
Lists the providers Nodepool should use. Each provider is associated to
a driver listed below.
**required**
``name``
**optional**
``driver``
Default to *openstack*
``max-concurrency``
Maximum number of node requests that this provider is allowed to handle
concurrently. The default, if not specified, is to have no maximum. Since
each node request is handled by a separate thread, this can be useful for
limiting the number of threads used by the nodepool-launcher daemon.
OpenStack driver
^^^^^^^^^^^^^^^^
Within each OpenStack provider the available Nodepool image types are defined
(see :ref:`provider_diskimages`).
An OpenStack provider's resources are partitioned into groups called "pools"
(see :ref:`pools` for details), and within a pool, the node types which are
to be made available are listed (see :ref:`pool_labels` for
details).
Example::
providers:
- name: provider1
driver: openstack
cloud: example
region-name: 'region1'
rate: 1.0
boot-timeout: 120
launch-timeout: 900
launch-retries: 3
image-name-format: '{image_name}-{timestamp}'
hostname-format: '{label.name}-{provider.name}-{node.id}'
diskimages:
- name: trusty
meta:
key: value
key2: value
- name: precise
- name: devstack-trusty
pools:
- name: main
max-servers: 96
availability-zones:
- az1
networks:
- some-network-name
labels:
- name: trusty
min-ram: 8192
diskimage: trusty
console-log: True
- name: precise
min-ram: 8192
diskimage: precise
- name: devstack-trusty
min-ram: 8192
diskimage: devstack-trusty
- name: provider2
driver: openstack
cloud: example2
region-name: 'region1'
rate: 1.0
image-name-format: '{image_name}-{timestamp}'
hostname-format: '{label.name}-{provider.name}-{node.id}'
diskimages:
- name: precise
meta:
key: value
key2: value
pools:
- name: main
max-servers: 96
labels:
- name: trusty
min-ram: 8192
diskimage: trusty
- name: precise
min-ram: 8192
diskimage: precise
- name: devstack-trusty
min-ram: 8192
diskimage: devstack-trusty
**required**
``cloud``
Name of a cloud configured in ``clouds.yaml``.
The instances spawned by nodepool will inherit the default security group
of the project specified in the cloud definition in `clouds.yaml`. This means
that when working with Zuul, for example, SSH traffic (TCP/22) must be allowed
in the project's default security group for Zuul to be able to reach instances.
More information about the contents of `clouds.yaml` can be found in
`the os-client-config documentation <http://docs.openstack.org/developer/os-client-config/>`_.
**optional**
``boot-timeout``
Once an instance is active, how long to try connecting to the
image via SSH. If the timeout is exceeded, the node launch is
aborted and the instance deleted.
In seconds. Default 60.
``launch-timeout``
The time to wait from issuing the command to create a new instance
until that instance is reported as "active". If the timeout is
exceeded, the node launch is aborted and the instance deleted.
In seconds. Default 3600.
``nodepool-id`` (deprecated)
A unique string to identify which nodepool instances is using a provider.
This is useful if you want to configure production and development instances
of nodepool but share the same provider.
Default None
``launch-retries``
The number of times to retry launching a server before considering the job
failed.
Default 3.
``region-name``
``hostname-format``
Hostname template to use for the spawned instance.
Default ``{label.name}-{provider.name}-{node.id}``
``image-name-format``
Format for image names that are uploaded to providers.
Default ``{image_name}-{timestamp}``
``rate``
In seconds, amount to wait between operations on the provider.
Defaults to ``1.0``.
``clean-floating-ips``
If it is set to True, nodepool will assume it is the only user of the
OpenStack project and will attempt to clean unattached floating ips that
may have leaked around restarts.
.. _pools:
pools
~~~~~
A pool defines a group of resources from an OpenStack provider. Each pool has a
maximum number of nodes which can be launched from it, along with a
number of cloud-related attributes used when launching nodes.
Example::
pools:
- name: main
max-servers: 96
availability-zones:
- az1
networks:
- some-network-name
auto-floating-ip: False
labels:
- name: trusty
min-ram: 8192
diskimage: trusty
console-log: True
- name: precise
min-ram: 8192
diskimage: precise
- name: devstack-trusty
min-ram: 8192
diskimage: devstack-trusty
**required**
``name``
**optional**
``max-cores``
Maximum number of cores usable from this pool. This can be used to limit
usage of the tenant. If not defined nodepool can use all cores up to the
quota of the tenant.
``max-servers``
Maximum number of servers spawnable from this pool. This can be used to
limit the number of servers. If not defined nodepool can create as many
servers the tenant allows.
``max-ram``
Maximum ram usable from this pool. This can be used to limit the amount of
ram allocated by nodepool. If not defined nodepool can use as much ram as
the tenant allows.
``availability-zones`` (list)
A list of availability zones to use.
If this setting is omitted, nodepool will fetch the list of all
availability zones from nova. To restrict nodepool to a subset
of availability zones, supply a list of availability zone names
in this setting.
Nodepool chooses an availability zone from the list at random
when creating nodes but ensures that all nodes for a given
request are placed in the same availability zone.
``networks`` (list)
Specify custom Neutron networks that get attached to each
node. Specify the name or id of the network as a string.
``auto-floating-ip`` (bool)
Specify custom behavior of allocating floating ip for each node.
When set to False, nodepool-launcher will not apply floating ip
for nodes. When zuul instances and nodes are deployed in the same
internal private network, set the option to False to save floating ip
for cloud provider. The default value is True.
.. _provider_diskimages:
diskimages
~~~~~~~~~~
Each entry in a provider's `diskimages` section must correspond to an
entry in :ref:`diskimages`. Such an entry indicates that the
corresponding diskimage should be uploaded for use in this provider.
Additionally, any nodes that are created using the uploaded image will
have the associated attributes (such as flavor or metadata).
If an image is removed from this section, any previously uploaded
images will be deleted from the provider.
Example configuration::
diskimages:
- name: precise
pause: False
meta:
key: value
key2: value
- name: windows
connection-type: winrm
**required**
``name``
Identifier to refer this image from :ref:`labels` and :ref:`diskimages`
sections.
**optional**
``pause`` (bool)
When set to True, nodepool-builder will not upload the image to the
provider.
``config-drive`` (boolean)
Whether config drive should be used for the image. Defaults to unset which
will use the cloud's default behavior.
``meta`` (dict)
Arbitrary key/value metadata to store for this server using the Nova
metadata service. A maximum of five entries is allowed, and both keys and
values must be 255 characters or less.
``connection-type`` (string)
The connection type that a consumer should use when connecting onto the
node. For most diskimages this is not necessary. However when creating
Windows images this could be 'winrm' to enable access via ansible.
.. _provider_cloud_images:
cloud-images
~~~~~~~~~~~~
Each cloud-image entry in :ref:`labels` refers to an entry in this section.
This is a way for modifying launch parameters of the nodes (currently only
config-drive).
Example configuration::
cloud-images:
- name: trusty-external
config-drive: False
- name: windows-external
connection-type: winrm
**required**
``name``
Identifier to refer this cloud-image from :ref:`labels` section.
Since this name appears elsewhere in the nodepool configuration
file, you may want to use your own descriptive name here and use
one of ``image-id`` or ``image-name`` to specify the cloud image
so that if the image name or id changes on the cloud, the impact
to your Nodepool configuration will be minimal. However, if
neither of those attributes are provided, this is also assumed to
be the image name or ID in the cloud.
**optional**
``config-drive`` (boolean)
Whether config drive should be used for the cloud image. Defaults to
unset which will use the cloud's default behavior.
``image-id`` (str)
If this is provided, it is used to select the image from the cloud
provider by ID, rather than name. Mutually exclusive with ``image-name``.
``image-name`` (str)
If this is provided, it is used to select the image from the cloud
provider by this name or ID. Mutually exclusive with ``image-id``.
``username`` (str)
The username that a consumer should use when connecting onto the node.
``connection-type`` (str)
The connection type that a consumer should use when connecting onto the
node. For most diskimages this is not necessary. However when creating
Windows images this could be 'winrm' to enable access via ansible.
.. _pool_labels:
labels
~~~~~~
Each entry in a pool`s `labels` section indicates that the
corresponding label is available for use in this pool. When creating
nodes for a label, the flavor-related attributes in that label's
section will be used.
Example configuration::
labels:
- name: precise
min-ram: 8192
flavor-name: 'something to match'
console-log: True
**required**
``name``
Identifier to refer this image from :ref:`labels` and :ref:`diskimages`
sections.
**one of**
``diskimage``
Refers to provider's diskimages, see :ref:`provider_diskimages`.
``cloud-image``
Refers to the name of an externally managed image in the cloud that already
exists on the provider. The value of ``cloud-image`` should match the
``name`` of a previously configured entry from the ``cloud-images`` section
of the provider. See :ref:`provider_cloud_images`.
**at least one of**
``flavor-name``
Name or id of the flavor to use. If ``min-ram`` is omitted, it
must be an exact match. If ``min-ram`` is given, ``flavor-name`` will
be used to find flavor names that meet ``min-ram`` and also contain
``flavor-name``.
``min-ram``
Determine the flavor to use (e.g. ``m1.medium``, ``m1.large``,
etc). The smallest flavor that meets the ``min-ram`` requirements
will be chosen.
**optional**
``boot-from-volume`` (bool)
If given, the label for use in this pool will create a volume from the
image and boot the node from it.
Default: False
``key-name``
If given, is the name of a keypair that will be used when booting each
server.
``console-log`` (default: False)
On the failure of the ssh ready check, download the server console log to
aid in debuging the problem.
``volume-size``
When booting an image from volume, how big should the created volume be.
In gigabytes. Default 50.
Static driver
^^^^^^^^^^^^^
The static provider driver is used to define static nodes. Nodes are also
partitioned into groups called "pools" (see :ref:`static_nodes` for details).
Example::
providers:
- name: static-rack
driver: static
pools:
- name: main
nodes:
- name: trusty.example.com
labels: trusty-static
host-key: fake-key
timeout: 13
ssh-port: 22022
username: zuul
max-parallel-jobs: 1
.. _static_nodes:
static nodes
~~~~~~~~~~~~
Each entry in a pool`s nodes section indicates a static node and it's
corresponding label.
**required**
``name``
The hostname or ip address of the static node.
``labels`` (list)
The list of labels associated with the node.
**optional**
``username``
The username nodepool will use to validate it can connect to the node.
Default to *zuul*
``timeout``
The timeout in second before the ssh ping is considered failed.
Default to *5* seconds
``host-key``
The ssh host key of the node.
``ssh-port``
The ssh port, default to *22*
``max-parallel-jobs``
The number of jobs that can run in parallel on this node, default to *1*.
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