296 lines
10 KiB
Python
296 lines
10 KiB
Python
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#!/usr/bin/python
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# -*- coding: utf-8 -*-
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# Copyright: (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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# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
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from __future__ import absolute_import, division, print_function
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__metaclass__ = type
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ANSIBLE_METADATA = {'metadata_version': '1.1',
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'status': ['preview'],
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'supported_by': 'community'}
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DOCUMENTATION = r'''
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---
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author:
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- Alexander Bulimov (@abulimov)
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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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type: str
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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 when creating or resizing volume group.
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- The module will take care of running pvcreate if needed.
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type: list
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pesize:
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description:
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- "The size of the physical extent. I(pesize) must be a power of 2 of at least 1 sector
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(where the sector size is the largest sector size of the PVs currently used in the VG),
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or at least 128KiB."
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- Since Ansible 2.6, pesize can be optionally suffixed by a UNIT (k/K/m/M/g/G), default unit is megabyte.
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type: str
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default: "4"
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pv_options:
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description:
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- Additional options to pass to C(pvcreate) when creating the volume group.
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type: str
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version_added: "2.4"
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vg_options:
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description:
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- Additional options to pass to C(vgcreate) when creating the volume group.
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type: str
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version_added: "1.6"
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state:
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description:
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- Control if the volume group exists.
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type: str
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choices: [ absent, present ]
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default: present
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force:
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description:
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- If C(yes), allows to remove volume group with logical volumes.
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type: bool
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default: no
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seealso:
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- module: filesystem
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- module: lvol
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- module: parted
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notes:
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- This module does not modify PE size for already present volume group.
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'''
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EXAMPLES = r'''
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- name: Create a volume group on top of /dev/sda1 with physical extent size = 32MB
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lvg:
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vg: vg.services
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pvs: /dev/sda1
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pesize: 32
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- name: Create a volume group on top of /dev/sdb with physical extent size = 128KiB
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lvg:
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vg: vg.services
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pvs: /dev/sdb
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pesize: 128K
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# If, for example, we already have VG vg.services on top of /dev/sdb1,
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# this VG will be extended by /dev/sdc5. Or if vg.services was created on
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# top of /dev/sda5, we first extend it with /dev/sdb1 and /dev/sdc5,
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# and then reduce by /dev/sda5.
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- name: Create or resize a volume group on top of /dev/sdb1 and /dev/sdc5.
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lvg:
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vg: vg.services
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pvs: /dev/sdb1,/dev/sdc5
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- name: Remove a volume group with name vg.services
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lvg:
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vg: vg.services
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state: absent
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'''
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import itertools
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import os
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from ansible.module_utils.basic import AnsibleModule
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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 find_mapper_device_name(module, dm_device):
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dmsetup_cmd = module.get_bin_path('dmsetup', True)
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mapper_prefix = '/dev/mapper/'
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rc, dm_name, err = module.run_command("%s info -C --noheadings -o name %s" % (dmsetup_cmd, dm_device))
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if rc != 0:
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module.fail_json(msg="Failed executing dmsetup command.", rc=rc, err=err)
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mapper_device = mapper_prefix + dm_name.rstrip()
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return mapper_device
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def parse_pvs(module, data):
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pvs = []
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dm_prefix = '/dev/dm-'
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for line in data.splitlines():
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parts = line.strip().split(';')
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if parts[0].startswith(dm_prefix):
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parts[0] = find_mapper_device_name(module, parts[0])
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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(type='str', required=True),
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pvs=dict(type='list'),
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pesize=dict(type='str', default='4'),
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pv_options=dict(type='str', default=''),
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vg_options=dict(type='str', default=''),
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state=dict(type='str', default='present', choices=['absent', 'present']),
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force=dict(type='bool', default=False),
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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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pvoptions = module.params['pv_options'].split()
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vgoptions = module.params['vg_options'].split()
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dev_list = []
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if module.params['pvs']:
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dev_list = 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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# LVM always uses real paths not symlinks so replace symlinks with actual path
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for idx, dev in enumerate(dev_list):
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dev_list[idx] = os.path.realpath(dev)
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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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pvs_cmd = module.get_bin_path('pvs', True)
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if dev_list:
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pvs_filter_pv_name = ' || '.join(
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'pv_name = {0}'.format(x)
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for x in itertools.chain(dev_list, module.params['pvs'])
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)
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pvs_filter_vg_name = 'vg_name = {0}'.format(vg)
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pvs_filter = "--select '{0} || {1}' ".format(pvs_filter_pv_name, pvs_filter_vg_name)
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else:
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pvs_filter = ''
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rc, current_pvs, err = module.run_command("%s --noheadings -o pv_name,vg_name --separator ';' %s" % (pvs_cmd, pvs_filter))
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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(module, 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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vgs_cmd = module.get_bin_path('vgs', True)
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rc, current_vgs, err = module.run_command("%s --noheadings -o vg_name,pv_count,lv_count --separator ';'" % vgs_cmd)
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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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pvcreate_cmd = module.get_bin_path('pvcreate', True)
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for current_dev in dev_list:
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rc, _, err = module.run_command([pvcreate_cmd] + pvoptions + ['-f', str(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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vgcreate_cmd = module.get_bin_path('vgcreate')
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rc, _, err = module.run_command([vgcreate_cmd] + vgoptions + ['-s', pesize, vg] + dev_list)
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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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vgremove_cmd = module.get_bin_path('vgremove', True)
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rc, _, err = module.run_command("%s --force %s" % (vgremove_cmd, 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 = [os.path.realpath(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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pvcreate_cmd = module.get_bin_path('pvcreate', True)
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for current_dev in devs_to_add:
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rc, _, err = module.run_command([pvcreate_cmd] + pvoptions + ['-f', str(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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vgextend_cmd = module.get_bin_path('vgextend', True)
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rc, _, err = module.run_command("%s %s %s" % (vgextend_cmd, 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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vgreduce_cmd = module.get_bin_path('vgreduce', True)
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rc, _, err = module.run_command("%s --force %s %s" % (vgreduce_cmd, 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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if __name__ == '__main__':
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main()
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