Puppet Docker Creating a Docker service using a Puppet manifest

Question

I want to create a distributed application across multiple swarm nodes for which i need to create a docker service. How can i achieve this objective using puppet?

Answer 1

• Docker services are used to create distributed applications across multiple swarm nodes. 

• Each Docker service replicates a set of containers 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',
    mounts => ['type=bind,source=/etc/my-redis.conf,target=/etc/redis/redis.conf,readonly'],
    extra_params => ['--update-delay 1m', '--restart-window 30s'],
    command => ['redis-server', '--appendonly', 'yes'],
  }

• To base the service off an image, include the image parameter and include the publish parameter to expose the service port (use an array to specify multiple published ports). 

• To set the amount of containers running in the service, include the replicas parameter. 

• To attach one or multiple filesystems to the service, use the mounts parameter. 

• For information regarding the extra_params parameter, see docker service create --help. 

• The command parameter can either be specified as an array or a string.