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Add pacemaker cluster module for being managable with ansible (#19594)
* Add pacemaker cluster module for being managable with ansible * fix yaml syntax in documentation * Remove useless dependency * Import AnsibleModule instead of import *
This commit is contained in:
mathieu bultel
John R Barker
parent
2c17f9becd
commit
962a592628
1 changed files with 225 additions and 0 deletions
225
lib/ansible/modules/clustering/pacemaker_cluster.py
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225
lib/ansible/modules/clustering/pacemaker_cluster.py
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#!/usr/bin/python
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#coding: utf-8 -*-
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# (c) 2016, Mathieu Bultel <mbultel@redhat.com>
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#
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# This module is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This software is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this software. If not, see <http://www.gnu.org/licenses/>.
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import time
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from distutils.version import StrictVersion
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DOCUMENTATION = '''
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---
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module: pacemaker_cluster
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short_description: Manage a pacemaker cluster
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version_added: "2.3"
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author: "Mathieu Bultel (matbu)"
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description:
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- This module can manage a pacemaker cluster and nodes from Ansible using
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the pacemaker cli.
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options:
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state:
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description:
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- Indicate desired state of the cluster
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choices: ['online', 'offline', 'restart', 'cleanup']
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required: true
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node:
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description:
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- Specify which node of the cluster you want to manage. None == the
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cluster status itself, 'all' == check the status of all nodes.
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required: false
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default: None
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timeout:
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description:
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- Timeout when the module should considered that the action has failed
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required: false
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default: 300
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force:
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description:
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- Force the change of the cluster state
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required: false
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default: true
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requirements:
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- "python >= 2.6"
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'''
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EXAMPLES = '''
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---
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- name: Set cluster Online
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hosts: localhost
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gather_facts: no
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tasks:
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- name: get cluster state
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pacemaker_cluster: state=online
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'''
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RETURN = '''
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change:
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description: True if the cluster state has changed
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type: bool
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out:
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description: The output of the current state of the cluster. It return a
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list of the nodes state.
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type: string
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sample: 'out: [[" overcloud-controller-0", " Online"]]}'
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rc:
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description: exit code of the module
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type: bool
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'''
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_PCS_CLUSTER_DOWN="Error: cluster is not currently running on this node"
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def get_cluster_status(module):
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cmd = "pcs cluster status"
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rc, out, err = module.run_command(cmd)
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if out in _PCS_CLUSTER_DOWN:
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return 'offline'
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else:
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return 'online'
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def get_node_status(module, node='all'):
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if node == 'all':
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cmd = "pcs cluster pcsd-status %s" % node
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else:
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cmd = "pcs cluster pcsd-status"
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rc, out, err = module.run_command(cmd)
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if rc is 1:
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module.fail_json(msg="Command execution failed.\nCommand: `%s`\nError: %s" % (cmd, err))
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status = []
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for o in out.splitlines():
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status.append(o.split(':'))
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return status
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def clean_cluster(module, timeout):
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cmd = "pcs resource cleanup"
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rc, out, err = module.run_command(cmd)
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if rc is 1:
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module.fail_json(msg="Command execution failed.\nCommand: `%s`\nError: %s" % (cmd, err))
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def set_cluster(module, state, timeout, force):
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if state == 'online':
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cmd = "pcs cluster start"
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if state == 'offline':
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cmd = "pcs cluster stop"
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if force:
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cmd = "%s --force" % cmd
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rc, out, err = module.run_command(cmd)
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if rc is 1:
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module.fail_json(msg="Command execution failed.\nCommand: `%s`\nError: %s" % (cmd, err))
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t = time.time()
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ready = False
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while time.time() < t+timeout:
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cluster_state = get_cluster_status(module)
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if cluster_state == state:
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ready = True
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break
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if not ready:
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module.fail_json(msg="Failed to set the state `%s` on the cluster\n" % (state))
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def set_node(module, state, timeout, force, node='all'):
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# map states
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if state == 'online':
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cmd = "pcs cluster start"
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if state == 'offline':
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cmd = "pcs cluster stop"
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if force:
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cmd = "%s --force" % cmd
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nodes_state = get_node_status(module, node)
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for node in nodes_state:
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if node[1].strip().lower() != state:
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cmd = "%s %s" % (cmd, node[0].strip())
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rc, out, err = module.run_command(cmd)
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if rc is 1:
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module.fail_json(msg="Command execution failed.\nCommand: `%s`\nError: %s" % (cmd, err))
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t = time.time()
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ready = False
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while time.time() < t+timeout:
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nodes_state = get_node_status(module)
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for node in nodes_state:
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if node[1].strip().lower() == state:
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ready = True
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break
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if not ready:
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module.fail_json(msg="Failed to set the state `%s` on the cluster\n" % (state))
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def main():
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argument_spec = dict(
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state = dict(choices=['online', 'offline', 'restart', 'cleanup']),
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node = dict(default=None),
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timeout=dict(default=300, type='int'),
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force=dict(default=True, type='bool'),
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)
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module = AnsibleModule(argument_spec,
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supports_check_mode=True,
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)
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changed = False
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state = module.params['state']
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node = module.params['node']
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force = module.params['force']
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timeout = module.params['timeout']
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if state in ['online', 'offline']:
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# Get cluster status
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if node is None:
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cluster_state = get_cluster_status(module)
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if cluster_state == state:
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module.exit_json(changed=changed,
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out=cluster_state)
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else:
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set_cluster(module, state, timeout, force)
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cluster_state = get_cluster_status(module)
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if cluster_state == state:
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module.exit_json(changed=True,
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out=cluster_state)
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else:
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module.fail_json(msg="Fail to bring the cluster %s" % state)
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else:
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cluster_state = get_node_status(module, node)
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# Check cluster state
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for node_state in cluster_state:
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if node_state[1].strip().lower() == state:
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module.exit_json(changed=changed,
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out=cluster_state)
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else:
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# Set cluster status if needed
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set_cluster(module, state, timeout, force)
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cluster_state = get_node_status(module, node)
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module.exit_json(changed=True,
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out=cluster_state)
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if state in ['restart']:
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set_cluster(module, 'offline', timeout, force)
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cluster_state = get_cluster_status(module)
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if cluster_state == 'offline':
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set_cluster(module, 'online', timeout, force)
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cluster_state = get_cluster_status(module)
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if cluster_state == 'online':
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module.exit_json(changed=True,
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out=cluster_state)
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else:
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module.fail_json(msg="Failed during the restart of the cluster, the cluster can't be started")
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else:
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module.fail_json(msg="Failed during the restart of the cluster, the cluster can't be stopped")
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if state in ['cleanup']:
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set_cluster(module, state, timeout, force)
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module.exit_json(changed=True,
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out=cluster_state)
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from ansible.module_utils.basic import AnsibleModule
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if __name__ == '__main__':
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main()
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