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Docker

Formulas for working with Docker

Available states

docker

Install and run Docker daemon

Note

On Ubuntu 12.04 state will also update kernel if needeed (as mentioned in docker installation docs). You should manually reboot minions for kernel update to take affect.

You can override the default docker daemon options by setting each line in the "docker-pkg:lookup:config" pillar. This effectively writes the config in /etc/default/docker. See pillar.example

docker.containers

Pulls and runs a number of docker containers with arbitrary run options all configurable via pillars. Salt includes dockerio and dockerng states, but both depend on docker-py library, which not always implements the latest docker run options. This gives the user more control over the docker run options, but it doesn't try to implement all the other docker commands, such as build, ps, inspect, etc. It just pulls an image and runs it.

To use it, just include docker.containers in your top.sls, and configure it using pillars:

docker-containers:
  lookup:
    mycontainer:
      image: "my_image"
      cmd:
      runoptions:
        - "-e MY_ENV=warn"
        - "--log-driver=syslog"
        - "-p 2345:2345"
        - "--rm"
    myapp:
      image: "myregistry.com:5000/training/app:3.0"
      cmd:  python app.py
      runoptions:
        - "--log-driver=syslog"
        - "-v /mnt/myapp:/myapp"
        - "-p 80:80"
        - "--rm"
      stopoptions:
        - -t 60

In the example pillar above:

  • mycontainer and myapp are the container names (ie --name option).
  • Upstart files are created for each container, so service <container_name> stop|start|status should just work
  • service <container_name> stop will wipeout the container completely (ie docker stop <container_name> + docker rm <container_name>)

docker.compose

Add support for using Docker Compose (previously fig) to define groups of containers and their relationships with one another.

docker.compose-ng

The intent is to provide an interface similar to the specification provided by docker-compose. The hope is that you may provide pillar data similar to that which you would use to define services with docker-compose. The assumption is that you are already using pillar data and salt formulae to represent the state of your existing infrastructure.

No real effort had been made to support every possible feature of docker-compose. Rather, we prefer the syntax provided by the docker-compose whenever it is reasonable for the sake of simplicity.

It is worth noting that we have added one attribute which is decidedly absent from the docker-compose specification. That attribute is dvc. This is a boolean attribute which allows us to define data only volume containers which can not be represented with the docker.running state interface since they are not intended to include a long living service inside the container.

See the included pillar.example for a representative pillar data block.

To use this formula, you might target a host with the following pillar:

docker:
  compose:
    registry-data:
      dvc: True
      image: &registry_image 'library/registry:0.9.1'
      container_name: &dvc 'registry-999-99-data'
      command: echo *dvc data volume container
      volumes:
        - &datapath '/registry'
    registry-service:
      image: *registry_image
      container_name: 'registry-999-99-service'
      restart: 'always'
      volumes_from:
        - *dvc
      environment:
        SETTINGS_FLAVOR: 'local'
        STORAGE_PATH: *datapath
        SEARCH_BACKEND: 'sqlalchemy'
    nginx:
      image: 'library/nginx:1.9.0'
      container_name: 'nginx-999-99'
      restart: 'always'
      links:
        - 'registry-999-99-service:registry'
      ports:
        - '80:80'
        - '443:443'

Then you would target a host with the following states:

include:
  - base: docker
  - base: docker.compose-ng

docker.registry (DEPRECATED)

NEW:

Since the more generic docker-container above has been implemented, the docker-registry state can now be deprecated. The registry is just another docker image, we can use docker-container with a pillar similar to this:

docker-containers:
  lookup:
    registry:
      image: "registry:2"
      cmd:
      runoptions:
        - "-e REGISTRY_STORAGE=s3"
        - "-e REGISTRY_STORAGE_S3_REGION=us-west-1"
        - "-e REGISTRY_STORAGE_S3_BUCKET=my-bucket"
        - "-e REGISTRY_STORAGE_S3_ROOTDIRECTORY=my_registry/folder"
        - "--log-driver=syslog"
        - "-p 5000:5000"
        - "--rm"

OLD:

IMPORTANT: docker.registry will eventually be removed.

Run a Docker container to start the registry service.

If "registry:lookup:version" pillar is either the string "latest" or not specified at all, it defaults to the "latest" image tag, which at the time of this writing is still pointing to 0.9.1, even though 2.x is out for a while. It still uses the old registry pillar configuration for backwards compatibility. See the commented out block in pillar.example

If "registry:lookup:version" is set to any other version, e.g. 2, an image with that tag will be downloaded and the new pillar configuation should be used. See pillar.example.

In this case, extra docker run options can be provided in your "registry:lookup:runoptions" pillar to provide environment variables, volumes, or log configuration to the container.

By default, the storage backend used by the registry is "filesystem". Use environment variables to override that, for example to use S3 as backend storage.

Testing

Testing is done with Test Kitchen for machine setup and testinfra for integration tests.

Requirements

  • Python
  • Ruby
  • Docker
gem install bundler
bundle install
kitchen test