swarm.pp
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	# == Define: docker::swarm
	#
	# A define that managers a Docker Swarm Mode cluster
	#
	# == Paramaters
	#
	# [ensure]
	# This ensures that the cluster is present or not.
	# Defaults to present
	# Note this forcefully removes a node from the cluster. Make sure all worker nodes
	# have been removed before managers
	#
	# [init]
	# This creates the first worker node for a new cluster.
	# Set init to true to create a new cluster
	# Defaults to false
	#
	# [join]
	# This adds either a worker or manger node to the cluster.
	# The role of the node is defined by the join token.
	# Set to true to join the cluster
	# Defaults to false
	#
	# [advertise_addr]
	# The address that your node will advertise to the cluster for raft.
	# On multihomed servers this flag must be passed
	# Defaults to undef
	#
	# [autolock]
	# Enable manager autolocking (requiring an unlock key to start a stopped manager)
	# Defaults to undef
	#
	# [cert_expiry]
	# Validity period for node certificates (ns\|us\|ms\|s\|m\|h) (default 2160h0m0s)
	# defaults to undef
	#
	# [dispatcher_heartbeat]
	# Dispatcher heartbeat period (ns\|us\|ms\|s\|m\|h) (default 5s)
	# Defaults to undef
	#
	# [external_ca]
	# Specifications of one or more certificate signing endpoints
	# Defaults to undef
	#
	# [force_new_cluster]
	# Force create a new cluster from current state
	# Defaults to false
	#
	# [listen_addr]
	# The address that your node will listen to the cluster for raft.
	# On multihomed servers this flag must be passed
	# Defaults to undef
	#
	# [max_snapshots]
	# Number of additional Raft snapshots to retain
	# Defaults to undef
	#
	# [snapshot_interval]
	# Number of log entries between Raft snapshots (default 10000)
	# Defaults to undef
	#
	# [token]
	# The authentication token to join the cluster. The token also defines the type of
	# node (worker or manager)
	# Defaults to undef
	#
	# [manager_ip]
	# The ip address of a manager node to join the cluster.
	# Defaults to undef
	#


	define docker::swarm(

	$ensure = 'present',
	$init = false,
	$join = false,
	$advertise_addr = undef,
	$autolock = false,
	$cert_expiry = undef,
	$dispatcher_heartbeat = undef,
	$external_ca = undef,
	$force_new_cluster = false,
	$listen_addr = undef,
	$max_snapshots = undef,
	$snapshot_interval = undef,
	$token = undef,
	$manager_ip = undef,
	){

	include docker::params

	$docker_command = "${docker::params::docker_command} swarm"
	validate_re($ensure, '^(present\|absent)$')
	validate_string($docker_command)
	validate_string($cert_expiry)
	validate_string($dispatcher_heartbeat)
	validate_string($external_ca)
	validate_string($max_snapshots)
	validate_string($snapshot_interval)
	validate_string($token)
	validate_ip_address($advertise_addr)
	validate_ip_address($listen_addr)
	validate_bool($init)
	validate_bool($join)
	validate_bool($autolock)
	validate_bool($force_new_cluster)

	if $init {
	$docker_swarm_init_flags = docker_swarm_init_flags({
	init => $init,
	advertise_addr => $advertise_addr,
	autolock => $autolock,
	cert_expiry => $cert_expiry,
	dispatcher_heartbeat => $dispatcher_heartbeat,
	external_ca => $external_ca,
	force_new_cluster => $force_new_cluster,
	listen_addr => $listen_addr,
	max_snapshots => $max_snapshots,
	snapshot_interval => $snapshot_interval,
	})

	$exec_init = "${docker_command} ${docker_swarm_init_flags}"
	$unless_init = 'docker info \| grep -w "Swarm: active"'

	exec { 'Swarm init':
	command => $exec_init,
	environment => 'HOME=/root',
	path => ['/bin', '/usr/bin'],
	timeout => 0,
	unless => $unless_init,
	}
	}

	if $join {
	$docker_swarm_join_flags = docker_swarm_join_flags({
	join => $join,
	advertise_addr => $advertise_addr,
	listen_addr => $listen_addr,
	token => $token,
	})

	$exec_join = "${docker_command} ${docker_swarm_join_flags} ${manager_ip}"
	$unless_join = 'docker info \| grep -w "Swarm: active"'

	exec { 'Swarm join':
	command => $exec_join,
	environment => 'HOME=/root',
	path => ['/bin', '/usr/bin'],
	timeout => 0,
	unless => $unless_join,
	}
	}

	if $ensure == 'absent' {
	exec { 'Leave swarm':
	command => 'docker swarm leave --force',
	onlyif => 'docker info \| grep -w "Swarm: active"',
	path => ['/bin', '/usr/bin'],
	}
	}
	}

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