Docker

Table of Contents

1. Description
2. Usage - Configuration options and additional functionality
3. Reference - An under-the-hood peek at what the module is doing and how
4. Limitations - OS compatibility, etc.
5. Development - Guide for contributing to the module

Overview

The Puppet docker module installs, configures, and manages Docker from the Docker repository. It supports the latest Docker CE (Community Edition) as well legacy releases.

With new naming convention of the Docker packages, this module now differentiates between by prefacing any params referring to the release with _ce or _engine. There are examples of this through the README.

Description

This module installs, configures, and manages Docker.

• Debian 8.0
• Debian 9.0
• Ubuntu 14.04
• Ubuntu 16.04
• Centos 7.0

Usage

To create the Docker hosted repository and install the Docker package, add a single class to the manifest file:

include 'docker'

To configure package sources independently and disable automatically including sources, add the following code to the manifest file:

class { 'docker':
  use_upstream_package_source => false,
}

The latest Docker repositories are now the default repositories for version 17.06 and above. If you are using a version prior to this, the old repositories will still be configured based on the version number passed into the module.

The following example will ensure the modules configures the latest repositories

class { 'docker':
  version => '17.09.0~ce-0~debian',
}

Using a version prior to 17.06 will configure and install from the old repositories

class { 'docker':
  version => '1.12.0-0~wheezy',
}

Docker provides a enterprise addition of the Docker Engine, called Docker EE. To install Docker EE on Debian systems, add the following code to the manifest file:

class { 'docker':
  docker_ee => true,
  docker_ee_source_location => 'https://<docker_ee_repo_url',
  docker_ee_key_source => 'https://<docker_ee_key_source_url',
  docker_ee_key_id => '<key id>',
}

To install Docker EE on RHEL/CentOS:

class { 'docker':
  docker_ee => true,
  docker_ee_source_location => 'https://<docker_ee_repo_url',
  docker_ee_key_source => 'https://<docker_ee_key_source_url',
}

For CentOS distributions, the docker module requires packages from the extras repo. This repo is enabled by default on CentOS. For more information see the official CentOS documentation here and the official Docker documentation here

For Red Hat Enterprise Linux (RHEL) based distributions, the docker module uses the upstream repositories. To continue using the legacy distribution packages in the CentOS Extras repo, add the following code to the manifest file:

class { 'docker':
  use_upstream_package_source => false,
  service_overrides_template  => false,
  docker_ce_package_name      => 'docker',
}

To use the CE packages

class { 'docker':
  use_upstream_package_source => false,
  repo_opt => '',  
}

By default, the Docker daemon binds to a unix socket at /var/run/docker.sock. To change this parameter and to update the binding parameter to a tcp socket, add the following code to the manifest file:

class { 'docker':
  tcp_bind        => ['tcp://127.0.0.1:4243','tcp://10.0.0.1:4243'],
  socket_bind     => 'unix:///var/run/docker.sock',
  ip_forward      => true,
  iptables        => true,
  ip_masq         => true,
  bridge          => br0,
  fixed_cidr      => '10.20.1.0/24',
  default_gateway => '10.20.0.1',
}

If setting up TLS, upload the related files (such as CA certificate, server certificate, and key) and include their paths in the manifest file:

class { 'docker':
  tcp_bind        => ['tcp://0.0.0.0:2376'],
  tls_enable      => true,
  tls_cacert      => '/etc/docker/tls/ca.pem',
  tls_cert        => '/etc/docker/tls/cert.pem',
  tls_key         => '/etc/docker/tls/key.pem',
}

To specify which Docker rpm package to install, add the following code to the manifest file:

class { 'docker' :
  manage_package              => true,
  use_upstream_package_source => false,
  package_engine_name         => 'docker-engine'
  package_source_location     => 'https://get.docker.com/rpm/1.7.0/centos-6/RPMS/x86_64/docker-engine-1.7.0-1.el6.x86_64.rpm',
  prerequired_packages        => [ 'glibc.i686', 'glibc.x86_64', 'sqlite.i686', 'sqlite.x86_64', 'device-mapper', 'device-mapper-libs', 'device-mapper-event-libs', 'device-mapper-event' ]
}

To track the latest version of Docker, add the following code to the manifest file:

class { 'docker':
  version => 'latest',
}

To install docker from a test or edge channel, add the following code to the manifest file:

class { 'docker':
  docker_ce_channel => 'test'
}

To allocate a dns server to the Docker daemon, add the following code to the manifest file:

class { 'docker':
  dns => '8.8.8.8',
}

To add users to the Docker group, add the following array to the manifest file:

class { 'docker':
  docker_users => ['user1', 'user2'],
}

To add daemon labels, add the following array to the manifest file:

class { 'docker':
  labels => ['storage=ssd','stage=production'],
}

Images

Each image name must be unique, otherwise the installation fails when a duplicate name is detected.

To install a Docker image, add the docker::image defined type to the manifest file:

docker::image { 'base': }

The code above is equivalent to running the docker pull base command. However, it removes the default five minute execution timeout.

To include an optional parameter for installing image tags that is the equivalent to running docker pull -t="precise" ubuntu, add the following code to the manifest file:

docker::image { 'ubuntu':
  image_tag => 'precise'
}

Including the docker_file parameter is equivalent to running the docker build -t ubuntu - < /tmp/Dockerfile command. To add or build an image from a dockerfile that includes the docker_file parameter, add the following code to the manifest file:

docker::image { 'ubuntu':
  docker_file => '/tmp/Dockerfile'
}

Including the docker_dir parameter is equivalent to running the docker build -t ubuntu /tmp/ubuntu_image command. To add or build an image from a dockerfile that includes the docker_dir parameter, add the following code to the manifest file:

docker::image { 'ubuntu':
  docker_dir => '/tmp/ubuntu_image'
}

To rebuild an image, subscribe to external events such as Dockerfile changes by adding the following code to the manifest file:

docker::image { 'ubuntu':
  docker_file => '/tmp/Dockerfile'
  subscribe => File['/tmp/Dockerfile'],
}

file { '/tmp/Dockerfile':
  ensure => file,
  source => 'puppet:///modules/someModule/Dockerfile',
}

To remove an image, add the following code to the manifest file:

docker::image { 'base':
  ensure => 'absent'
}

docker::image { 'ubuntu':
  ensure    => 'absent',
  image_tag => 'precise'
}

To configure the docker::images class when using Hiera, add the following code to the manifest file:

---
  classes:
    - docker::images

docker::images::images:
  ubuntu:
    image_tag: 'precise'

Containers

To launch containers, add the following code to the manifest file:

docker::run { 'helloworld':
  image   => 'base',
  command => '/bin/sh -c "while true; do echo hello world; sleep 1; done"',
}

This is equivalent to running the docker run -d base /bin/sh -c "while true; do echo hello world; sleep 1; done" command to launch a Docker container managed by the local init system.

run includes a number of optional parameters:

docker::run { 'helloworld':
  image            => 'base',
  detach           => true,
  service_prefix   => 'docker-',
  command          => '/bin/sh -c "while true; do echo hello world; sleep 1; done"',
  ports            => ['4444', '4555'],
  expose           => ['4666', '4777'],
  links            => ['mysql:db'],
  net              => 'my-user-def-net',
  disable_network  => false,
  volumes          => ['/var/lib/couchdb', '/var/log'],
  volumes_from     => '6446ea52fbc9',
  memory_limit     => '10m', # (format: '<number><unit>', where unit = b, k, m or g)
  cpuset           => ['0', '3'],
  username         => 'example',
  hostname         => 'example.com',
  env              => ['FOO=BAR', 'FOO2=BAR2'],
  env_file         => ['/etc/foo', '/etc/bar'],
  labels           => ['com.example.foo="true"', 'com.example.bar="false"'],
  dns              => ['8.8.8.8', '8.8.4.4'],
  restart_service  => true,
  privileged       => false,
  pull_on_start    => false,
  before_stop      => 'echo "So Long, and Thanks for All the Fish"',
  before_start     => 'echo "Run this on the host before starting the Docker container"',
  after            => [ 'container_b', 'mysql' ],
  depends          => [ 'container_a', 'postgres' ],
  stop_wait_time   => 0,
  read_only        => false,
  extra_parameters => [ '--restart=always' ],
}

You can specify the ports, expose, env, dns, and volumes values with a single string or an array.

To pull the image before it starts, specify the pull_on_start parameter.

To execute a command before the container stops, specify the before_stop parameter.

Add the container name to the after parameter to specify which containers start first. This affects the generation of the init.d/systemd script.

Add container dependencies to the depends parameter. The container starts before this container and stops before the depended container. This affects the generation of the init.d/systemd script. Use the depend_services parameter to specify dependencies for generic services, which are not Docker related, that start before this container.

The extra_parameters parameter contains an array of command line arguments to pass to the docker run command. This parameter is useful for adding additional or experimental options that the docker module currently does not support.

By default, automatic restarting of the service on failure is enabled by the service file for systemd based systems.

To use an image tag, add the following code to the manifest file:

docker::run { 'helloworld':
  image   => 'ubuntu:precise',
  command => '/bin/sh -c "while true; do echo hello world; sleep 1; done"',
}

By default, when the service is stopped or started the generated init scripts remove the container, but not the associated volumes. To change this behaviour, add the following code to the manifest file:

docker::run { 'helloworld':
  remove_container_on_start => true,
  remove_volume_on_start    => false,
  remove_container_on_stop  => true,
  remove_volume_on_stop     => false,
}

If using Hiera, you can configure the docker::run_instance class:

---
  classes:
    - docker::run_instance

  docker::run_instance::instance:
    helloworld:
      image: 'ubuntu:precise'
      command: '/bin/sh -c "while true; do echo hello world; sleep 1; done"'

To remove a running container, add the following code to the manifest file. This will also remove the systemd service file associated with the container.

'''puppet docker::run { 'helloworld': ensure => absent, } '''

Networks

Docker 1.9.x officially supports networks. To expose the docker_network type, which is used to manage networks, add the following code to the manifest file:

docker_network { 'my-net':
  ensure   => present,
  driver   => 'overlay',
  subnet   => '192.168.1.0/24',
  gateway  => '192.168.1.1',
  ip_range => '192.168.1.4/32',
}

The name value and the ensure parameter are required. If you do not include the driver value, the default bridge is used. The Docker daemon must be configured for some networks and an example would be configuring the cluster store for the overlay network.

To configure the cluster store, update the docker class in the manifest file:

extra_parameters => '--cluster-store=<backend>://172.17.8.101:<port> --cluster-advertise=<interface>:2376'

If using Hiera, configure the docker::networks class in the manifest file:

---
  classes:
    - docker::networks

docker::networks::networks:
  local-docker:
    ensure: 'present'
    subnet: '192.168.1.0/24'
    gateway: '192.168.1.1'

A defined network can be used on a docker::run resource with the net parameter.

Volumes

Docker 1.9.x added support for Volumes. These are NOT to be confused with the legacy volumes, now known as bind mounts. To expose the docker_volume type, which is used to manage volumes, add the following code to the manifest file:

docker_volume { 'my-volume':
  ensure => present,
}

The name value and the ensure parameter are required. If you do not include the driver value, the default local is used.

Some of the key advantages for using volumes over bind mounts are:

• Easier to back up or migrate than bind mounts (legacy volumes).
• Managed with Docker CLI or API (Puppet type uses the CLI commands).
• Work on both Windows and Linux.
• More easily shared between containers.
• Allows for the store volumes on remote hosts or cloud providers.
• Encrypt contents of volumes.
• Add other functionality
• New volume's contents can be pre-populated by a container.

When using the volumes array with docker::run, the command on the backend will know if it needs to use bind mounts or volumes based off the data passed to the -v option.

Running docker::run with native volumes:

docker::run { 'helloworld':
  image   => 'ubuntu:precise',
  command => '/bin/sh -c "while true; do echo hello world; sleep 1; done"',
  volumes => ['my-volume:/var/log'],
}

For more information on volumes see the Docker Volumes documentation

Compose

Docker Compose describes a set of containers in YAML format and runs a command to build and run those containers. Included in the docker module is the docker_compose type. This enables Puppet to run Compose and remediate any issues to ensure reality matches the model in your Compose file.

You must install the Docker Compose utility, before you use the docker_compose type.

To install Docker Compose, add the following code to the manifest file:

class {'docker::compose':
  ensure => present,
  version => '1.9.0',
  
}

The param version can be set to any version that you need to install.

This is a example of a Compose file:

compose_test:
  image: ubuntu:14.04
  command: /bin/sh -c "while true; do echo hello world; sleep 1; done"

Specify the file resource to add a Compose file to the machine you have Puppet running on. To define a docker_compose resource pointing to the Compose file, add the following code to the manifest file:

docker_compose { '/tmp/docker-compose.yml':
  ensure  => present,
}

Puppet automatically runs Compose, because the relevant Compose services aren't running. You can include additional options, such as enabling experimental features, as well as including scaling rules.

In the example below, Puppet runs Compose when the number of containers specified for a service don't match the scale values.

docker_compose { '/tmp/docker-compose.yml':
  ensure  => present,
  scale   => {
    'compose_test' => 2,
  },
  options => '--x-networking'
}

You can also give options to the docker-compose up command, such as --remove-orphans``, by using the up_args``` option.

If you are using a v3.2 compose file or above on a Docker Swarm cluster, you must use the docker::stack class. Include the file resource before you run the stack command.

To deploy the stack, add the following code to the manifest file:

 docker::stack { 'yourapp':
   ensure  => present,
   stack_name => 'yourapp',
   compose_file => '/tmp/docker-compose.yaml',
   require => [Class['docker'], File['/tmp/docker-compose.yaml']],
}

To remove the stack set ensure => absent.

If you are using a compose file v3.2 or above on a Docker Swarm cluster, include the docker::stack class. Like with older versions of Docker, compose the file resource needs before you run the stack command. To deploy the stack, add the following code to the manifest file.

docker::stack { 'yourapp':
  ensure  => present,
  stack_name => 'yourapp',
  compose_file => '/tmp/docker-compose.yaml',
  require => [Class['docker'], File['/tmp/docker-compose.yaml']],
}

To remove the stack, set ensure => absent.

Swarm mode

To natively manage a cluster of Docker Engines known as a swarm, Docker Engine 1.12 includes a swarm mode.

To cluster your Docker engines, use one of the following Puppet resources:

• Swarm manager
• Swarm worker

Swarm manager

To configure the swarm manager, add the following code to the manifest file:

docker::swarm {'cluster_manager':
  init           => true,
  advertise_addr => '192.168.1.1',
  listen_addr    => '192.168.1.1',
}

For a multihomed server and to enable cluster communications between the node, include the advertise_addr and listen_addr parameters.

Swarm worker

To configure the swarm worker, add the following code to the manifest file:

docker::swarm {'cluster_worker':
join           => true,
advertise_addr => '192.168.1.2',
listen_addr    => '192.168.1.2,
manager_ip     => '192.168.1.1',
token          => 'SWMTKN-1-2lw8bnr57qsu74d6iq2q1wr2wq2i334g7425dfr3zucimvh4bl-2vwn6gysbdj605l37c61iixie'
}

To configure a worker node or a second manager, include the swarm manager IP address in the manager_ip parameter. To define the role of the node in the cluster, include the token parameter. When creating another swarm manager and a worker node, separate tokens are required.

To remove a node from a cluster, add the following code to the manifest file:

docker::swarm {'cluster_worker':
ensure => absent
}

Docker services

Docker services create distributed applications across multiple swarm nodes. Each Docker service contains a set of containers which are replicated across the swarm.

To create a Docker service, add the following code to the manifest file:

docker::services {'redis':
    create => true,
    service_name => 'redis',
    image => 'redis:latest',
    publish => '6379:639',
    replicas => '5',
    extra_params => ['--update-delay 1m', '--restart-window 30s']
  }

To base the service off an image, include the image parameter and include the publish parameter to expose the service ports. To set the amount of containers running in the service, include the replicas parameter. For information regarding the extra_params parameter, see docker service create --help.

To update the service, add the following code to the manifest file:

docker::services {'redis_update':
  create => false,
  update => true,
  service_name => 'redis',
  replicas => '3',
}

To update a service without creating a new one, include the the update => true parameter and the create => false parameter.

To scale a service, add the following code to the manifest file:

docker::services {'redis_scale':
  create => false,
  scale => true,
  service_name => 'redis',
  replicas => '10',
}

To scale the service without creating a new one, include the the scale => true parameter and the create => false parameter. In the example above, the service is scaled to 10.

To remove a service, add the following code to the manifest file:

docker::services {'redis':
  create => false,
  ensure => 'absent',
  service_name => 'redis',
}

To remove the service from a swarm, include the ensure => absent parameter and the service_name parameter.

Private registries

If a server is not specified, images are pushed and pulled from index.docker.io. To qualify your image name, create a private repository without authentication.

To configure authentication for a private registry, add the following code to the manifest file , depending on what version of Docker you are running. If you are using Docker V1.10 or earlier add the following code to the manifest file ensuring that you specify the docker version:

docker::registry { 'example.docker.io:5000':
  username => 'user',
  password => 'secret',
  email    => 'user@example.com',
  version  => '<docker_version>'
}

If using hiera, configure the docker::registry_auth class:

docker::registry_auth::registries:
  'example.docker.io:5000':
    username: 'user1'
    password: 'secret'
    email: 'user1@example.io'
    version: '<docker_version>'

If using Docker V1.11 or later the docker login e-mail flag has been deprecated docker_change_log. Add the following code to the manifest file:

docker::registry { 'example.docker.io:5000'}
  username => 'user',
  password => 'secret',
}

If using hiera, configure the 'docker::registry_auth' class:

docker::registry_auth::registries:
  'example.docker.io:5000':
    username: 'user1'
    password: 'secret'

To log out of a registry, add the following code to the manifest file:

docker::registry { 'example.docker.io:5000':
  ensure => 'absent',
}

To set a preferred registry mirror, add the following code to the manifest file:

class { 'docker':
  registry_mirror => 'http://testmirror.io'
}

Exec

Within the context of a running container, the docker module supports arbitrary commands:

docker::exec { 'cron_allow_root':
  detach       => true,
  container    => 'mycontainer',
  command      => '/bin/echo root >> /usr/lib/cron/cron.allow',
  tty          => true,
  unless       => 'grep root /usr/lib/cron/cron.allow 2>/dev/null',
}

Plugin

The module supports the installation of docker plugins:

docker::plugin {'foo/fooplugin:latest':
  settings => ['VAR1=test','VAR2=value']
}

To disable an active plugin:

docker::plugin {'foo/fooplugin:latest':
  enaled => false,
}

To remove an active plugin:

docker::plugin {'foo/fooplugin:latest'
  ensure => 'absent',
  force_remove => true,
}

Reference

Parameters

version

The version of the package to install.

Defaults to undefined.

ensure

Passed to the docker package.

Defaults to present.

prerequired_packages

An array of packages that are required to support Docker.

tcp_bind

The tcp socket to bind to. The format is tcp://127.0.0.1:4243.

Defaults to undefined.

tls_enable

Specifies whether to enable TLS.

Values 'true','false'.

Defaults to false.

tls_verify

Specifies whether to use TLS and verify the remote.

Values 'true','false'.

Defaults to true.

tls_cacert

The directory for the TLS CA certificate.

Defaults to '/etc/docker/ca.pem'.

tls_cert

The directory for the TLS certificate file.

Defaults to '/etc/docker/cert.pem'.

tls_key

The directory for the TLS key file.

Defaults to '/etc/docker/cert.key'.

ip_forward

Specifies whether to enable IP forwarding on the Docker host.

Values 'true','false'.

Defaults to true.

iptables

Specifies whether to enable Docker's addition of iptables rules.

Values 'true','false'.

Defaults to true.

ip_masq

Specifies whether to enable IP masquerading for the bridge's IP range.

Values 'true','false'.

Defaults to true.

icc

Enable the Docker unrestricted inter-container and the daemon host communication.

To disable, it requires iptables=true.

Defaults to undef. The default value for the Docker daemon is true.

bip

Specifies the Docker network bridge IP in CIDR notation.

Defaults to undefined.

mtu

Docker network MTU.

Defaults to undefined.

bridge

Attach containers to a pre-existing network bridge. To disable container networking, include none.

Defaults to undefined.

fixed_cidr

IPv4 subnet for fixed IPs 10.20.0.0/16.

Defaults to undefined.

default_gateway

IPv4 address for the container default gateway. This address must be part of the bridge subnet (which is defined by bridge).

Defaults to undefined.

ipv6

Enables ipv6 support for the docker daemon

Defaults to false

ipv6_cidr

IPv6 subnet for fixed IPs

Defaults to undefined

default_gateway_ipv6

IPv6 address of the container default gateway:

Defaults to undefined

socket_bind

The unix socket to bind to.

Defaults to unix:///var/run/docker.sock.

log_level

Sets the logging level.

Defaults to undef. If no value is specified, Docker defaults to info.

Valid values: debug, info, warn, error, and fatal.

log_driver

Sets the log driver.

Defaults to undef.

Docker default is json-file.

Valid values:

• none: disables logging for the container. Docker logs are not available with this driver.
• json-file: the default Docker logging driver that writes JSON messages to file.
• syslog: syslog logging driver that writes log messages to syslog.
• journald: journald logging driver that writes log messages to journald.
• gelf: Graylog Extended Log Format (GELF) logging driver that writes log messages to a GELF endpoint: Graylog or Logstash.
• fluentd: fluentd logging driver that writes log messages to fluentd (forward input).
• splunk: Splunk logging driver that writes log messages to Splunk (HTTP Event Collector).

log_opt

Define the log driver option.

Defaults to undef.

Valid values:

• none: undef
• json-file: max-size=[0-9+][k|m|g] max-file=[0-9+]
• syslog: syslog-address=[tcp|udp]://host:port, syslog-address=unix://path, syslog-facility=daemon|kern|user|mail|auth, syslog|lpr|news|uucp|cron, authpriv|ftp, local0|local1|local2|local3, local4|local5|local6|local7, syslog-tag="some_tag"
• journald: undef
• gelf: gelf-address=udp://host:port, gelf-tag="some_tag"
• fluentd: fluentd-address=host:port, fluentd-tag={{.ID}} - short container id (12 characters), {{.FullID}} - full container id, {{.Name}} - container name
• splunk: splunk-token=<splunk_http_event_collector_token>, splunk-url=https://your_splunk_instance:8088|

selinux_enabled

Specifies whether to enable selinux support. SELinux supports the BTRFS storage driver.

Valid values are true, false.

Defaults to false.

use_upstream_package_source

Specifies whether to use the upstream package source.

Valid values are true, false.

When you run your own package mirror, set the value to false.

pin_upstream_package_source

Specifies whether to use the pin upstream package source. This option relates to apt-based distributions.

Valid values are true, false.

Defaults to true.

Set to false to remove pinning on the upstream package repository. See also apt_source_pin_level.

apt_source_pin_level

The level to pin your source package repository to. This relates to an apt-based system (such as Debian, Ubuntu, etc). Include $use_upstream_package_source and set the value to true.

To disable pinning, set the value to false.

Defaults to 10.

package_source_location

Specifies the location of the package source.

For Debian, the value defaults to http://get.docker.com/ubuntu.

service_state

Specifies whether to start the Docker daemon.

Defaults to running.

service_enable

Specifies whether the Docker daemon starts up at boot.

Valid values are true, false.

Defaults to true.

manage_service

Specifies whether the service should be managed.

Valid values are true, `false'.

Defaults to `true'.

root_dir

The custom root directory for the containers.

Defaults to undefined.

dns

The custom dns server address.

Defaults to undefined.

dns_search

The custom dns search domains.

Defaults to undefined.

socket_group

Group ownership of the unix control socket.

Default is OS and package specific.

extra_parameters

Extra parameters that should be passed to the Docker daemon.

Defaults to undefined.

shell_values

The array of shell values to pass into the init script config files.

proxy

Defines the http_proxy and https_proxy env variables in /etc/sysconfig/docker (redhat/centos) or /etc/default/docker (debian).

no_proxy

Sets the no_proxy variable in /etc/sysconfig/docker (redhat/centos) or /etc/default/docker (debian).

storage_driver

Defines the storage driver to use.

Default is undef: let docker choose the correct one.

Valid values: aufs, devicemapper, btrfs, overlay, overlay2, vfs, and zfs.

dm_basesize

The size to use when creating the base device, which limits the size of images and containers.

Default value is 10G.

dm_fs

The filesystem to use for the base image (xfs or ext4).

Defaults to ext4.

dm_mkfsarg

Specifies extra mkfs arguments to be used when creating the base device.

dm_mountopt

Specifies extra mount options used when mounting the thin devices.

dm_blocksize

A custom blocksize for the thin pool.

Default blocksize is 64K.

Do not change this parameter after the lvm devices initialize.

dm_loopdatasize

Specifies the size to use when creating the loopback file for the data device which is used for the thin pool.

Default size is 100G.

dm_loopmetadatasize

Specifies the size to use when creating the loopback file for the metadata device which is used for the thin pool.

Default size is 2G.

dm_datadev

This is deprecated. Use dm_thinpooldev.

A custom blockdevice to use for data for the thin pool.

dm_metadatadev

This is deprecated. Use dm_thinpooldev.

A custom blockdevice to use for metadata for the thin pool.

dm_thinpooldev

Specifies a custom block storage device to use for the thin pool.

dm_use_deferred_removal

Enables the use of deferred device removal if libdm and the kernel driver support the mechanism.

dm_use_deferred_deletion

Enables the use of deferred device deletion if libdm and the kernel driver support the mechanism.

dm_blkdiscard

Enables the use of blkdiscard when removing devicemapper devices.

Valid values are true, false.

Defaults to false.

dm_override_udev_sync_check

Specifies whether to disable the devicemapper backend synchronizing with the udev device manager for the Linux kernel.

Valid values are true, false.

Defaults to true.

manage_package

Specifies whether to install or define the docker package. This is useful if you want to use your own package.

Valid values are true, false.

Defaults to true.

package_name

Specifies the custom package name.

Default is set on a per system basis in docker::params.

service_name

Specifies the custom service name.

Default is set on a per system basis in docker::params.

docker_command

Specifies a custom docker command name.

Default is set on a per system basis in docker::params.

daemon_subcommand

Specifies a subcommand for running docker as daemon.

Default is set on a per system basis in docker::params.

docker_users

Specifies an array of users to add to the docker group.

Default is empty.

docker_group

Specifies a string for the docker group.

Default is OS and package specific.

daemon_environment_files

Specifies additional environment files to add to the service-overrides.conf file.

repo_opt

Specifies a string to pass as repository options. This is for RedHat.

storage_devs

A quoted, space-separated list of devices to be used.

storage_vg

The volume group to use for docker storage.

storage_root_size

The maximum size of the root filesystem.

storage_data_size

The desired size for the docker data LV.

storage_min_data_size

Specifies the minimum size of data volume, otherwise the pool creation fails.

storage_chunk_size

Controls the chunk size/block size of the thin pool.

storage_growpart

Enables resizing the partition table backing root volume group.

storage_auto_extend_pool

Enables automatic pool extension using lvm.

storage_pool_autoextend_threshold

Auto pool extension threshold (in % of pool size).

storage_pool_autoextend_percent

Extends the pool by the specified percentage when the threshold is passed.

Tasks

The docker module has an example task that allows a user to initialize, join and leave a swarm.

bolt task run docker::swarm_init listen_addr=172.17.10.101 adverstise_addr=172.17.10.101 ---nodes swarm-master --user <user> --password <password> --modulepath <module_path>

docker swarm init --advertise-addr=172.17.10.101 --listen-addr=172.17.10.101
Swarm initialized: current node (w8syk0g286vd7d9kwzt7jl44z) is now a manager.

To add a worker to this swarm, run the following command:

    docker swarm join --token SWMTKN-1-317gw63odq6w1foaw0xkibzqy34lga55aa5nbjlqekcrhg8utl-08vrg0913zken8h9vfo4t6k0t 172.17.10.101:2377

To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.


Ran on 1 node in 4.04 seconds

bolt task run docker::swarm_token node_role=worker ---nodes swarm-master --user <user> --password <password> --modulepath <module_path>

SWMTKN-1-317gw63odq6w1foaw0xkibzqy34lga55aa5nbjlqekcrhg8utl-08vrg0913zken8h9vfo4t6k0t


Ran on 1 node in 4.02 seconds

bolt task run docker::swarm_join listen_addr=172.17.10.102 adverstise_addr=172.17.10.102 token=<swarm_token> manager_ip=172.17.10.101:2377 --nodes swarm-02 --user root --password puppet --modulepath /tmp/modules


This node joined a swarm as a worker.


Ran on 1 node in 4.68 seconds

bolt task run docker::swarm_leave --nodes swarm-02 --user root --password puppet --modulepath --modulepath <module_path>

Node left the swarm.


Ran on 1 node in 6.16 seconds

For further explanation please refer to thePE documentation or Bolt documentation on how to execute a task.

Limitations

This module supports:

• Debian 8.0
• Debian 9.0
• Ubuntu 14.04
• Ubuntu 16.04
• Centos 7.0

Development

If you would like to contribute to this module, see the guidelines in CONTRIBUTING.MD.