This cookbook contains two components: a Packer template to build a Docker-capable Ubuntu 13.04 AMI & a cookbook that creates Docker images & containers for memcached

This cookbook looks for an encrypted data bag named docker with a data bag item named auth. This holds your password for logging into https://index.docker.io. The format of the data bag item should look something like this:

{
  "id" : "auth",
  "registry_pwd": "super_secret_password"
}

Once the encrypted data bag has been uploaded to a Chef server, you should download the encrypted JSON to a local data_bags directory in your chef-repo. You can do this easily by running knife download /data_bags/docker from the root of your chef-repo.

In order to provision the created AMI, it is highly recommended that you use knife-ec2. As part of the setup of this knife plugin, you should set some local environment variables to avoid passing credentials over the command line:

export AWS_ACCESS_KEY='myamazonaccesskey'
export AWS_SECRET_KEY='myamazonsecretkey'

The first step is to put the packer-ubuntu-amazon.json file in the root of your chef-repo and create an AMI that is enabled with Docker provisioning bits:

mv packer-ubuntu-amazon.json ../../packer-ubuntu-amazon.json
packer build packer-ubuntu-amazon.json

Once the AMI is completed, you can bootstrap an EC2 server using this new AMI with knife ec2:

knife ec2 server create -I ami-XXXXXX -f m3.medium --aws-access-key-id $AWS_ACCESS_KEY --aws-secret-access-key $AWS_SECRET_KEY --ssh-key my_keypair --ssh-user ubuntu --identity-file ~/.ssh/my_keypair.pem --ebs-size 40 --run-list 'recipe[dockworker::provisioner], recipe[dockworker::base_image], recipe[dockworker::run_containers]'

You should be able to verify that memcached is running by logging into the newly created instance and testing the status of the Docker container and the memcached process:

sudo docker ps

CONTAINER ID        IMAGE                  COMMAND                CREATED             STATUS              PORTS                      NAMES
f3c333f82ca2        memcached_img:latest   /bin/sh -c memcached   19 minutes ago      Up 19 minutes       0.0.0.0:45001->11211/tcp   memcached_img

telnet localhost 45001

Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
stats
STAT pid 7
STAT uptime 802
STAT time 1399123034
STAT version 1.4.14 (Ubuntu)
...