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Merge pull request #2357 from abulimov/lvg-module
lvg module for managing LVM volume groups
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Michael DeHaan
commit
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1 changed files with 215 additions and 0 deletions
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library/lvg
Executable file
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library/lvg
Executable file
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#!/usr/bin/python
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# -*- coding: utf-8 -*-
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# (c) 2013, Alexander Bulimov <lazywolf0@gmail.com>
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# based on lvol module by Jeroen Hoekx <jeroen.hoekx@dsquare.be>
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#
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# This file is part of Ansible
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#
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# Ansible 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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# Ansible 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 Ansible. If not, see <http://www.gnu.org/licenses/>.
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DOCUMENTATION = '''
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---
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author: Alexander Bulimov
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module: lvg
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short_description: Configure LVM volume groups
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description:
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- This module creates, removes or resizes volume groups.
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version_added: "1.1"
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options:
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vg:
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description:
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- The name of the volume group.
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required: true
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pvs:
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description:
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- List of comma-separated devices to use as physical devices in this volume group.
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required: true
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pesize:
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description:
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- The size of the physical extent in megabytes.
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default: 4
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required: false
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state:
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choices: [ "present", "absent" ]
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default: present
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description:
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- Control if the volume group exists.
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required: false
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force:
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choices: [ "yes", "no" ]
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default: "no"
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description:
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- If yes, allows to remove or reduce volume group with logical volumes.
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required: false
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examples:
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- description: Create a volume group on top of /dev/sda1 with physical extent size = 32MB.
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code: lvg vg=vg.services pvs=/dev/sda1 pesize=32
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- description: Create a volume group on top of /dev/sdb1 and /dev/sdc5.
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code: lvg vg=vg.services pvs=/dev/sdb1,/dev/sdc5
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- description: Remove a volume group with name vg.services.
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code: lvg vg=vg.services state=absent
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notes:
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- module does not modify PE size for already present volume group
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'''
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def parse_vgs(data):
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vgs = []
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for line in data.splitlines():
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parts = line.strip().split(';')
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vgs.append({
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'name': parts[0],
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'pv_count': int(parts[1]),
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'lv_count': int(parts[2]),
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})
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return vgs
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def parse_pvs(data):
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pvs = []
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for line in data.splitlines():
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parts = line.strip().split(';')
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pvs.append({
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'name': parts[0],
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'vg_name': parts[1],
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})
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return pvs
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def main():
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module = AnsibleModule(
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argument_spec = dict(
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vg=dict(required=True),
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pvs=dict(type='list'),
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pesize=dict(type='int', default=4),
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state=dict(choices=["absent", "present"], default='present'),
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force=dict(type='bool', default='no'),
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),
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supports_check_mode=True,
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)
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vg = module.params['vg']
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state = module.params['state']
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force = module.boolean(module.params['force'])
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pesize = module.params['pesize']
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if module.params['pvs']:
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dev_string = ' '.join(module.params['pvs'])
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dev_list = module.params['pvs']
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elif state == 'present':
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module.fail_json(msg="No physical volumes given.")
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if state=='present':
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### check given devices
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for test_dev in dev_list:
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if not os.path.exists(test_dev):
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module.fail_json(msg="Device %s not found."%test_dev)
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### get pv list
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rc,current_pvs,err = module.run_command("pvs --noheadings -o pv_name,vg_name --separator ';'")
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if rc != 0:
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module.fail_json(msg="Failed executing pvs command.",rc=rc, err=err)
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### check pv for devices
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pvs = parse_pvs(current_pvs)
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used_pvs = [ pv for pv in pvs if pv['name'] in dev_list and pv['vg_name'] and pv['vg_name'] != vg ]
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if used_pvs:
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module.fail_json(msg="Device %s is already in %s volume group."%(used_pvs[0]['name'],used_pvs[0]['vg_name']))
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rc,current_vgs,err = module.run_command("vgs --noheadings -o vg_name,pv_count,lv_count --separator ';'")
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if rc != 0:
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module.fail_json(msg="Failed executing vgs command.",rc=rc, err=err)
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changed = False
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vgs = parse_vgs(current_vgs)
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for test_vg in vgs:
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if test_vg['name'] == vg:
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this_vg = test_vg
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break
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else:
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this_vg = None
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if this_vg is None:
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if state == 'present':
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### create VG
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if module.check_mode:
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changed = True
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else:
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### create PV
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for current_dev in dev_list:
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rc,_,err = module.run_command("pvcreate %s"%current_dev)
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if rc == 0:
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changed = True
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else:
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module.fail_json(msg="Creating physical volume '%s' failed"%current_dev, rc=rc, err=err)
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rc,_,err = module.run_command("vgcreate -s %s %s %s"%(pesize, vg, dev_string))
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if rc == 0:
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changed = True
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else:
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module.fail_json(msg="Creating volume group '%s' failed"%vg, rc=rc, err=err)
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else:
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if state == 'absent':
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if module.check_mode:
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module.exit_json(changed=True)
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else:
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if this_vg['lv_count'] == 0 or force:
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### remove VG
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rc,_,err = module.run_command("vgremove --force %s"%(vg))
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if rc == 0:
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module.exit_json(changed=True)
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else:
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module.fail_json(msg="Failed to remove volume group %s"%(vg),rc=rc, err=err)
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else:
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module.fail_json(msg="Refuse to remove non-empty volume group %s without force=yes"%(vg))
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### resize VG
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current_devs = [ pv['name'] for pv in pvs if pv['vg_name'] == vg ]
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devs_to_remove = list(set(current_devs) - set(dev_list))
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devs_to_add = list(set(dev_list) - set(current_devs))
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if devs_to_add or devs_to_remove:
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if module.check_mode:
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changed = True
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else:
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if devs_to_add:
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devs_to_add_string = ' '.join(devs_to_add)
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### create PV
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for current_dev in devs_to_add:
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rc,_,err = module.run_command("pvcreate %s"%current_dev)
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if rc == 0:
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changed = True
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else:
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module.fail_json(msg="Creating physical volume '%s' failed"%current_dev, rc=rc, err=err)
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### add PV to our VG
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rc,_,err = module.run_command("vgextend %s %s"%(vg, devs_to_add_string))
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if rc == 0:
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changed = True
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else:
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module.fail_json(msg="Unable to extend %s by %s."%(vg, devs_to_add_string),rc=rc,err=err)
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### remove some PV from our VG
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if devs_to_remove:
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devs_to_remove_string = ' '.join(devs_to_remove)
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rc,_,err = module.run_command("vgreduce --force %s %s"%(vg, devs_to_remove_string))
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if rc == 0:
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changed = True
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else:
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module.fail_json(msg="Unable to reduce %s by %s."%(vg, devs_to_remove_string),rc=rc,err=err)
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module.exit_json(changed=changed)
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# this is magic, see lib/ansible/module_common.py
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#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
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main()
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