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#!/usr/bin/python
#coding: utf-8 -*-
# (c) 2016, Mathieu Bultel <mbultel@redhat.com>
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
from __future__ import absolute_import, division, print_function
__metaclass__ = type
ANSIBLE_METADATA = {'metadata_version': '1.1',
'status': ['preview'],
'supported_by': 'community'}
DOCUMENTATION = '''
---
module: pacemaker_cluster
short_description: Manage a pacemaker cluster
version_added: "2.3"
author: "Mathieu Bultel (matbu)"
description:
- This module can manage a pacemaker cluster and nodes from Ansible using
the pacemaker cli.
options:
state:
description:
- Indicate desired state of the cluster
choices: ['online', 'offline', 'restart', 'cleanup']
required: true
node:
description:
- Specify which node of the cluster you want to manage. None == the
cluster status itself, 'all' == check the status of all nodes.
required: false
default: None
timeout:
description:
- Timeout when the module should considered that the action has failed
required: false
default: 300
force:
description:
- Force the change of the cluster state
required: false
default: true
requirements:
- "python >= 2.6"
'''
EXAMPLES = '''
---
- name: Set cluster Online
hosts: localhost
gather_facts: no
tasks:
- name: get cluster state
pacemaker_cluster: state=online
'''
RETURN = '''
changed:
description: True if the cluster state has changed
type: bool
returned: always
out:
description: The output of the current state of the cluster. It return a
list of the nodes state.
type: string
sample: 'out: [[" overcloud-controller-0", " Online"]]}'
returned: always
rc:
description: exit code of the module
type: bool
returned: always
'''
import time
from ansible.module_utils.basic import AnsibleModule
_PCS_CLUSTER_DOWN="Error: cluster is not currently running on this node"
def get_cluster_status(module):
cmd = "pcs cluster status"
rc, out, err = module.run_command(cmd)
if out in _PCS_CLUSTER_DOWN:
return 'offline'
else:
return 'online'
def get_node_status(module, node='all'):
if node == 'all':
cmd = "pcs cluster pcsd-status %s" % node
else:
cmd = "pcs cluster pcsd-status"
rc, out, err = module.run_command(cmd)
if rc is 1:
module.fail_json(msg="Command execution failed.\nCommand: `%s`\nError: %s" % (cmd, err))
status = []
for o in out.splitlines():
status.append(o.split(':'))
return status
def clean_cluster(module, timeout):
cmd = "pcs resource cleanup"
rc, out, err = module.run_command(cmd)
if rc is 1:
module.fail_json(msg="Command execution failed.\nCommand: `%s`\nError: %s" % (cmd, err))
def set_cluster(module, state, timeout, force):
if state == 'online':
cmd = "pcs cluster start"
if state == 'offline':
cmd = "pcs cluster stop"
if force:
cmd = "%s --force" % cmd
rc, out, err = module.run_command(cmd)
if rc is 1:
module.fail_json(msg="Command execution failed.\nCommand: `%s`\nError: %s" % (cmd, err))
t = time.time()
ready = False
while time.time() < t+timeout:
cluster_state = get_cluster_status(module)
if cluster_state == state:
ready = True
break
if not ready:
module.fail_json(msg="Failed to set the state `%s` on the cluster\n" % (state))
def set_node(module, state, timeout, force, node='all'):
# map states
if state == 'online':
cmd = "pcs cluster start"
if state == 'offline':
cmd = "pcs cluster stop"
if force:
cmd = "%s --force" % cmd
nodes_state = get_node_status(module, node)
for node in nodes_state:
if node[1].strip().lower() != state:
cmd = "%s %s" % (cmd, node[0].strip())
rc, out, err = module.run_command(cmd)
if rc is 1:
module.fail_json(msg="Command execution failed.\nCommand: `%s`\nError: %s" % (cmd, err))
t = time.time()
ready = False
while time.time() < t+timeout:
nodes_state = get_node_status(module)
for node in nodes_state:
if node[1].strip().lower() == state:
ready = True
break
if not ready:
module.fail_json(msg="Failed to set the state `%s` on the cluster\n" % (state))
def main():
argument_spec = dict(
state = dict(choices=['online', 'offline', 'restart', 'cleanup']),
node = dict(default=None),
timeout=dict(default=300, type='int'),
force=dict(default=True, type='bool'),
)
module = AnsibleModule(argument_spec,
supports_check_mode=True,
)
changed = False
state = module.params['state']
node = module.params['node']
force = module.params['force']
timeout = module.params['timeout']
if state in ['online', 'offline']:
# Get cluster status
if node is None:
cluster_state = get_cluster_status(module)
if cluster_state == state:
module.exit_json(changed=changed,
out=cluster_state)
else:
set_cluster(module, state, timeout, force)
cluster_state = get_cluster_status(module)
if cluster_state == state:
module.exit_json(changed=True,
out=cluster_state)
else:
module.fail_json(msg="Fail to bring the cluster %s" % state)
else:
cluster_state = get_node_status(module, node)
# Check cluster state
for node_state in cluster_state:
if node_state[1].strip().lower() == state:
module.exit_json(changed=changed,
out=cluster_state)
else:
# Set cluster status if needed
set_cluster(module, state, timeout, force)
cluster_state = get_node_status(module, node)
module.exit_json(changed=True,
out=cluster_state)
if state in ['restart']:
set_cluster(module, 'offline', timeout, force)
cluster_state = get_cluster_status(module)
if cluster_state == 'offline':
set_cluster(module, 'online', timeout, force)
cluster_state = get_cluster_status(module)
if cluster_state == 'online':
module.exit_json(changed=True,
out=cluster_state)
else:
module.fail_json(msg="Failed during the restart of the cluster, the cluster can't be started")
else:
module.fail_json(msg="Failed during the restart of the cluster, the cluster can't be stopped")
if state in ['cleanup']:
clean_cluster(module, timeout)
cluster_state = get_cluster_status(module)
module.exit_json(changed=True,
out=cluster_state)
if __name__ == '__main__':
main()
|
