Pacemaker : Set LVM Shared Storage2022/09/15

Configure Active/Passive HA-LVM (High Availability LVM) volume in Cluster.

This example is based on the environment like follows.
Before this setting, Configure basic settings of Cluster and Configure Fence device first.

                        +--------------------+
                        | [  ISCSI Target  ] |
                        |    dlp.srv.world   |
                        +---------+----------+
                         10.0.0.30|
                                  |
+----------------------+          |          +----------------------+
| [  Cluster Node#1  ] |10.0.0.51 | 10.0.0.52| [  Cluster Node#2  ] |
|   node01.srv.world   +----------+----------+   node02.srv.world   |
|                      |                     |                      |
+----------------------+                     +----------------------+

[1]	Create a storage for share on ISCSI Target, refer to here. On this example, it created ISCSI storage as IQN [iqn.2022-01.world.srv:dlp.target02] with [10G] size.
[2]	On all Cluster Nodes, Change LVM System ID.

root@node01:~#

vi /etc/lvm/lvm.conf

# line 1227 : uncomment and change

system_id_source = "

uname

[3]	On a Node in Cluster, Set LVM on shared storage. [sdb] on the example below is shared storage from ISCSI Target.

# current session

root@node01:~#

iscsiadm -m session -o show

tcp: [1] 10.0.0.30:3260,1 iqn.2022-01.world.srv:dlp.target01 (non-flash)

# discover

root@node01:~#

iscsiadm -m discovery -t sendtargets -p 10.0.0.30

10.0.0.30:3260,1 iqn.2022-01.world.srv:dlp.target01
10.0.0.30:3260,1 iqn.2022-01.world.srv:dlp.target02

# login

root@node01:~#

iscsiadm -m node --login --target iqn.2022-01.world.srv:dlp.target02

root@node01:~#

iscsiadm -m session -o show

tcp: [1] 10.0.0.30:3260,1 iqn.2022-01.world.srv:dlp.target01 (non-flash)
tcp: [2] 10.0.0.30:3260,1 iqn.2022-01.world.srv:dlp.target02 (non-flash)

# set LVM

root@node01:~#

parted --script /dev/sdb "mklabel gpt"

root@node01:~#

parted --script /dev/sdb "mkpart primary 0% 100%"

root@node01:~#

parted --script /dev/sdb "set 1 lvm on"

# create physical volume

root@node01:~#

pvcreate /dev/sdb1

  Physical volume "/dev/sdb1" successfully created.

# create volume group

root@node01:~#

vgcreate vg_ha /dev/sdb1

  Volume group "vg_ha" successfully created with system ID node01.srv.world

# confirm the value of [System ID] equals the value of [$ uname -n]

root@node01:~#

vgs -o+systemid

  VG              #PV #LV #SN Attr   VSize    VFree    System ID
  ubuntu-vg         1   1   0 wz--n-  <28.00g 1020.00m
  vg_ha             1   0   0 wz--n-   <9.98g   <9.98g node01.srv.world

# create logical volume

root@node01:~#

lvcreate -l 100%FREE -n lv_ha vg_ha

  Logical volume "lv_ha" created.

# format with ext4

root@node01:~#

mkfs.ext4 /dev/vg_ha/lv_ha

[4]	On other Nodes except a Node of [3], Scan LVM volumes to find new volume.

root@node02:~#

iscsiadm -m session -o show

tcp: [1] 10.0.0.30:3260,1 iqn.2022-01.world.srv:dlp.target01 (non-flash)

root@node02:~#

iscsiadm -m discovery -t sendtargets -p 10.0.0.30

10.0.0.30:3260,1 iqn.2022-01.world.srv:dlp.target01
10.0.0.30:3260,1 iqn.2022-01.world.srv:dlp.target02

root@node02:~#

iscsiadm -m node --login --target iqn.2022-01.world.srv:dlp.target02

root@node02:~#

iscsiadm -m session -o show

tcp: [1] 10.0.0.30:3260,1 iqn.2022-01.world.srv:dlp.target01 (non-flash)
tcp: [2] 10.0.0.30:3260,1 iqn.2022-01.world.srv:dlp.target02 (non-flash)

root@node02:~#

lvm pvscan --cache --activate ay

  pvscan[1150] PV /dev/sda1 ignore foreign VG.
  pvscan[1150] PV /dev/vda3 online, VG ubuntu-vg is complete.
  pvscan[1150] PV /dev/vdb1 online, VG ceph-5464aa8c-7249-47e7-a37b-d24e10457f0f is complete.
  pvscan[1150] VG ubuntu-vg run autoactivation.

[5]	On a Node of [3], Set shared storage as a Cluster resource.

# [lvm_ha] : any name
# [vgname=***] : volume group name
# [--group] : any name

root@node01:~#

pcs resource create lvm_ha ocf:heartbeat:LVM-activate vgname=vg_ha vg_access_mode=system_id --group ha_group

# confirm status
# OK if LVM resource is [Started]

root@node01:~#

pcs status

Cluster name: ha_cluster
Cluster Summary:
  * Stack: corosync
  * Current DC: node01.srv.world (version 2.1.2-ada5c3b36e2) - partition with quorum
  * Last updated: Thu Sep 15 01:30:33 2022
  * Last change:  Thu Sep 15 01:30:21 2022 by root via cibadmin on node01.srv.world
  * 2 nodes configured
  * 2 resource instances configured

Node List:
  * Online: [ node01.srv.world node02.srv.world ]

Full List of Resources:
  * scsi-shooter        (stonith:fence_scsi):    Started node01.srv.world
  * Resource Group: ha_group:
    * lvm_ha    (ocf:heartbeat:LVM-activate):    Started node02.srv.world

Daemon Status:
  corosync: active/enabled
  pacemaker: active/enabled
  pcsd: active/enabled

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