Docker Cookbook

The Docker Cookbook provides resources for installing docker as well as building, managing, and running docker containers.

Scope

This cookbook is concerned with the Docker container engine as distributed by Docker, Inc. It does not address Docker ecosystem tooling or prerequisite technology such as cgroups or aufs.

Maintainers

This cookbook is maintained by the Sous Chefs. The Sous Chefs are a community of Chef cookbook maintainers working together to maintain important cookbooks. If you’d like to know more please visit sous-chefs.org or come chat with us on the Chef Community Slack in #sous-chefs.

Requirements

• Chef Infra Client 15 or later
• Network accessible web server hosting the docker binary.
• SELinux permissive/disabled if CentOS Docker Issue #15498

Platform Support

• Amazon Linux 2
• Debian 9/10/11
• Fedora
• Ubuntu 18.04/20.04
• CentOS 7/8

Cookbook Dependencies

This cookbook automatically sets up the upstream Docker package repositories. If you would like to use your own repositories this functionality can be disabled and you can instead setup the repos yourself with yum_repository/apt_repository resources or the chef-apt-docker / chef-yum-docker cookbooks.

Docker Group

If you are not using the official docker repositories you may run into issues with the docker group being different. RHEL is a known issue that defaults to using dockerroot for the service group. Add the group property to the docker_service.

docker_service 'default' do
  group 'dockerroot'
  action [:create, :start]
end

Usage

• Add depends 'docker' to your cookbook's metadata.rb
• Use the resources shipped in cookbook in a recipe, the same way you'd use core Chef resources (file, template, directory, package, etc).

docker_service 'default' do
  action [:create, :start]
end

docker_image 'busybox' do
  action :pull
end

docker_container 'an-echo-server' do
  repo 'busybox'
  port '1234:1234'
  command "nc -ll -p 1234 -e /bin/cat"
end

Test Cookbooks as Examples

The cookbooks ran under test-kitchen make excellent usage examples.

The test recipes are found at:

test/cookbooks/docker_test/

Resources Overview

• docker_service: composite resource that uses docker_installation and docker_service_manager
• docker_installation: automatically select an installation method
• docker_service_manager: automatically selects a service manager
• docker_installation_script: curl | bash
• docker_installation_package: package 'docker-ce'
• docker_service_manager_execute: manage docker daemon with Chef
• docker_service_manager_systemd: manage docker daemon with systemd unit files
• docker_image: image/repository operations
• docker_container: container operations
• docker_tag: image tagging operations
• docker_registry: registry operations
• docker_network: network operations
• docker_volume: volume operations
• docker_plugin: plugin operations

Getting Started

Here's a quick example of pulling the latest image and running a container with exposed ports.

# Pull latest image
docker_image 'nginx' do
  tag 'latest'
  action :pull
  notifies :redeploy, 'docker_container[my_nginx]'
end

# Run container mapping containers port 80 to the host's port 80
docker_container 'my_nginx' do
  repo 'nginx'
  tag 'latest'
  port [ '80:80' ]
  host_name 'www'
  domain_name 'computers.biz'
  env 'FOO=bar'
  volumes [ '/some/local/files/:/etc/nginx/conf.d' ]
end

You might run a private registry and multiple Docker hosts.

# Login to private registry
docker_registry 'https://registry.computers.biz/' do
  username 'shipper'
  password 'iloveshipping'
  email 'shipper@computers.biz'
end

# Pull tagged image
docker_image 'registry.computers.biz:443/my_project/my_container' do
  tag 'latest'
  action :pull
  host 'tcp://host-1.computers.biz:2376'
end

# Run container
docker_container 'crowsnest' do
  repo 'registry.computers.biz:443/my_project/my_container'
  tag 'latest'
  host 'tcp://host-2.computers.biz:2376'
  tls_verify true
  tls_ca_cert "/path/to/ca.pem"
  tls_client_cert "/path/to/cert.pem"
  tls_client_key "/path/to/key.pem"
  action :run
end

You can manipulate Docker volumes and networks

docker_network 'my_network' do
  subnet '10.9.8.0/24'
  gateway '10.9.8.1'
end

docker_volume 'my_volume' do
  action :create
end

docker_container 'my_container' do
  repo 'alpine'
  tag '3.1'
  command "nc -ll -p 1234 -e /bin/cat"
  volumes 'my_volume:/my_data'
  network_mode 'my_network'
  action :run
end

See full documentation for each resource and action below for more information.

Resources

docker_installation

The docker_installation resource auto-selects one of the below resources with the provider resolution system.

Example

docker_installation 'default'

docker_installation_tarball

The docker_installation_tarball resource copies the precompiled Go binary tarball onto the disk. It should not be used in production, especially with devicemapper.

Example

docker_installation_tarball 'default' do
  version '1.11.0'
  source 'https://my.computers.biz/dist/docker.tgz'
  checksum '97a3f5924b0b831a310efa8bf0a4c91956cd6387c4a8667d27e2b2dd3da67e4d'
  action :create
end

Properties

• version - The desired version of docker to fetch.
• channel - The docker channel to fetch the tarball from. Default: stable
• source - Path to network accessible Docker binary tarball. Ignores version when set.
• checksum - SHA-256 checksum of the tarball file.

docker_installation_script

The docker_installation_script resource runs the script hosted by Docker, Inc at http://get.docker.com. It configures package repositories and installs a dynamically compiled binary.

Example

docker_installation_script 'default' do
  repo 'main'
  script_url 'https://my.computers.biz/dist/scripts/docker.sh'
  action :create
end

Properties

• repo - One of 'main', 'test', or 'experimental'. Used to calculate script_url in its absence. Defaults to 'main'
• script_url - 'URL of script to pipe into /bin/sh as root.

docker_installation_package

The docker_installation_package resource uses the system package manager to install Docker. It relies on the pre-configuration of the system's package repositories. The chef-yum-docker and chef-apt-docker Supermarket cookbooks can be used to use Docker's own repositories.

This is the recommended production installation method.

Example

docker_installation_package 'default' do
  version '20.10.11'
  action :create
  package_options %q|--force-yes -o Dpkg::Options::='--force-confold' -o Dpkg::Options::='--force-all'| # if Ubuntu for example
end

Properties

• version - Used to calculate package_version string. This needs to be the complete version (19.03.8).
• package_version - Manually specify the package version string
• package_name - Name of package to install. Defaults to 'docker-ce'
• package_options - Manually specify additional options, like apt-get directives for example
• setup_docker_repo - Setup the download.docker.com repo. If you would like to manage the repo yourself so you can use an internal repo then set this to false. default: true on all platforms except Amazon Linux.
• repo_channel - The channel of docker to setup from download.docker.com. Only used if setup_docker_repo is true. default: 'stable'

docker_service_manager

The docker_service_manager resource auto-selects a strategy from the docker_service_manager_* group of resources based on platform and version. The docker_service family share a common set of properties.

Example

docker_service_manager 'default' do
  action :start
end

docker_service_manager_execute

Example

docker_service_manager_execute 'default' do
  action :start
end

docker_service_manager_systemd

Example

docker_service_manager_systemd 'default' do
  host ['unix:///var/run/docker.sock', 'tcp://127.0.0.1:2376']
  tls_verify true
  tls_ca_cert "/path/to/ca.pem"
  tls_server_cert "/path/to/server.pem"
  tls_server_key "/path/to/server-key.pem"
  tls_client_cert "/path/to/cert.pem"
  tls_client_key "/path/to/key.pem"
  systemd_opts ["TasksMax=infinity","MountFlags=private"]
  systemd_socket_opts ["Accept=yes"]
  action :start
end

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