various fixes in lvg module, added ability to reduce and extend VG, added Physical Extent parameter, added explicit creation of physical volumes
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Alexander Bulimov
parent
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1 changed files with 100 additions and 14 deletions
114
lvg
114
lvg
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@ -25,7 +25,7 @@ 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 or removes volume groups.
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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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@ -36,6 +36,11 @@ options:
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description:
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- List of comma-separated devices to use 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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@ -44,19 +49,19 @@ options:
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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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default: "no"
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description:
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- If yes, allows to remove 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.
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code: lvg vg=vg.services dev=/dev/sda1
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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 dev=/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 dev=/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 check device list for already present volume group
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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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@ -70,36 +75,63 @@ def parse_vgs(data):
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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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dev=dict(),
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pesize=dict(),
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state=dict(choices=["absent", "present"], default='present'),
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force=dict(choices=["yes", "no"], default='no'),
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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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if module.params['pesize']:
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pesize = int(module.params['pesize'])
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else:
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pesize = 4
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if module.params['dev']:
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dev = module.params['dev'].replace(',',' ')
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dev_list = module.params['dev'].split(',')
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state = module.params['state']
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force = module.params['force']
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if state=='present' and not dev:
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elif state == 'present':
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module.fail_json(msg="No dev 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="No dev %s 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 = filter(lambda pv: pv['name'] in dev_list and pv['vg_name'] and pv['vg_name'] != vg, pvs)
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if used_pvs:
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module.fail_json(msg="dev %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 creating volume group %s."%vg, rc=rc, err=err)
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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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@ -118,17 +150,24 @@ def main():
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if module.check_mode:
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changed = True
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else:
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rc,_,err = module.run_command("vgcreate %s %s"%(vg, dev))
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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))
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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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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 == "yes":
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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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@ -138,6 +177,53 @@ def main():
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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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action = None
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current_devs = map(lambda x: x['name'], filter(lambda pv: pv['vg_name'] == vg, pvs))
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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_remove and devs_to_add:
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devs_string = ' '.join([`dev` for dev in devs_to_add])
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devs_to_remove_string = ' '.join([`dev` for dev in devs_to_remove])
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action = 'modify'
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elif devs_to_remove:
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devs_string = ' '.join([`dev` for dev in devs_to_remove])
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action = 'reduce'
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elif devs_to_add:
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devs_string = ' '.join([`dev` for dev in devs_to_add])
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action = 'extend'
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if action:
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if module.check_mode:
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changed = True
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else:
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if action == 'extend' or action == 'modify':
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tool = 'vgextend'
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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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else:
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tool = 'vgreduce --force'
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### first we add or remove PV
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rc,_,err = module.run_command("%s %s %s"%(tool, vg, devs_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 %s %s by %s."%(action, vg, devs_string),rc=rc,err=err)
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### then if we need - remove some PV
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if action == 'modify':
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tool = 'vgreduce --force'
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rc,_,err = module.run_command("%s %s %s"%(tool, 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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