AdminSysGNULinux

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{{tag>Brouillon Ansible LVM Script Bash}}

# Ansible script shell command exemple pvresize idempotent

Voir :
  * ''M(community.general.lvg)''

''ansible/playbook.yml''

~~~yaml
#! /usr/bin/env ansible-playbook
---

- name: exemple
  hosts: all
  become: True
  
  vars:
    lvmconfig: [ { lv: root, sz: '40g' },
                { lv: var,  sz: '10g' },
                { lv: log,  sz: '100g' },
                { lv: opt,  sz:  '10g' } ]

  roles:
    - lvm-resize

~~~


''ansible/roles/lvm-resize/tasks/main.yml''

~~~yaml
---
# tasks file for roles/lvm-resize

- name: pvresize needed ?
  script: files/pvresize_check.sh /dev/xvdk
  changed_when: false
  check_mode: false
  failed_when:
    - pvresize_check.rc != 0      # OK
    - pvresize_check.rc != 101    # Change to do
  register: pvresize_check

- name: pvresize
  command: pvresize /dev/xvdk
  when: pvresize_check.rc == 101

- name: resize volume group
  lvg:
    vg: vg_os
    pvs: /dev/xvdk

- name: configure sizes for each LVM partition
  lvol: vg=vg_os  lv={{ item.lv }}  size={{ item.sz }} state=present shrink=no resizefs=yes
  with_items: "{{ lvmconfig }}"
~~~


''ansible/roles/lvm-resize/files/pvresize_check.sh''

~~~bash
#!/bin/bash

set -e
set -o nounset

DEV=$(basename "$(readlink -f "$1")")

isNonEmptyStr () {
  echo "$@" | grep -q -v "^$"
}

# SIZE IN GB
BLKDEV_SIZE=$(($(cat /sys/class/block/"$DEV"/size) * 512 / 1024 / 1024 / 1024))
PV_SIZE=$(pvs --noheadings /dev/"$DEV" |awk '{print $5}' |sed 's/^[^0-9]\+//' |sed 's/[^0-9].*//g')

isNonEmptyStr "$BLKDEV_SIZE" ||exit 3
isNonEmptyStr "$PV_SIZE"     ||exit 4

if [ "$BLKDEV_SIZE" -eq "$PV_SIZE" ]
then
        exit 0
else
        exit 101
fi
~~~


## Notes

Voir également
~~~bash
parted -s /dev/xvdk print free
~~~

~~~bash
pvs --noheadings -o pv_size --units b --nosuffix /dev/sdb
vgs --noheadings -o pv_size --units b --nosuffix vg_data
~~~