GSTN - ZIMBRA MAILBOX CLUSTER

Pacemaker: Install

Install and Configure Linux High-Availability Cluster tool "Pacemaker".

mailbox.gstn.org.in

172.18.101.20

|

+----------------------+ | +----------------------+

| [ Node01 ] |172.18.101.18 |172.18.101.19 | [ Node02 ] |

| gd9109.gstn.org.in +----------+----------+ gd9109.gstn.org.in |

| | | |

+----------------------+ +----------------------+

Install Pacemaker like follows on all Nodes.

[root@gd9109 ~]# yum -y install pacemaker pcs

[root@gd9109 ~]# systemctl start pcsd

[root@gd9109 ~]# systemctl enable pcsd

Set password for cluster admin user

[root@gd9109 ~]# passwd hacluster

Changing password for user hacluster.

New password:

Retype new password:

passwd: all authentication tokens updated successfully.

Configure like follows on a Node.

Establish authorization

[root@gd9109 ~]# pcs cluster auth gd9109.gstn.org.in gd9110.gstn.org.in

Username: hacluster

Password:

gd9109.gstn.org.in: Authorized

gd9110.gstn.org.in: Authorized

Configure cluster

[root@gd9109 ~]# pcs cluster setup --name Mailbox-Cluster gd9109.gstn.org.in gd9110.gstn.org.in

Shutting down pacemaker/corosync services...

Redirecting to /bin/systemctl stop pacemaker.service

Redirecting to /bin/systemctl stop corosync.service

Killing any remaining services...

Removing all cluster configuration files...

gd9109.gstn.org.in: Succeeded

gd9110.gstn.org.in: Succeeded

Start services for cluster

[root@gd9109 ~]# pcs cluster start --all

gd9109.gstn.org.in: Starting Cluster...

gd9110.gstn.org.in: Starting Cluster...

Enable cluster

[root@gd9109 ~]# pcs cluster enable --all

gd9109.gstn.org.in: Cluster Enabled

gd9110.gstn.org.in: Cluster Enabled

Show status

[root@gd9109 ~]# pcs status corosync

Membership information

----------------------

Nodeid Votes Name

1 1 gd9109 (local)

2 1 gd9110

Show settings

[root@gd9109 ~]# pcs property list

Cluster Properties:

cluster-infrastructure: corosync

cluster-name: Mailbox-Cluster

dc-version: 1.1.13-10.el7-44eb2dd

have-watchdog: false

last-lrm-refresh: 1471967184

stonith-action: reboot

symmetric-cluster: on

Pacemaker: Add Resource

Set virtual IP address

IPv4 Resource:

[root@gd9109 ~]# pcs resource create ClusterIP ocf:heartbeat:IPaddr2 ip=172.18.101.20 cidr_netmask=24 op monitor interval=30s

IPv6 Resource:

[root@gd9109 ~]# pcs resource create ClusterIPv6 ocf:heartbeat:IPaddr2 ip=2404:a800:1000:d:7800::14 cidr_netmask=69 op monitor interval=30s

Install required packages on all Nodes.

[root@gd9109 ~]# yum -y install fence-agents-all lvm2-cluster gfs2-utils

Add required resources. It's OK to set on a node.

[root@gd9109 ~]# pcs resource create dlm ocf:pacemaker:controld op monitor interval=30s on-fail=fence clone interleave=true ordered=true

[root@gd9109 ~]# pcs resource create clvmd ocf:heartbeat:clvm op monitor interval=30s on-fail=fence clone interleave=true ordered=true

[root@gd9109 ~]# pcs constraint order start dlm-clone then clvmd-clone

[root@gd9109 ~]# pcs constraint colocation add clvmd-clone with dlm-clone

Pacemaker: CLVM + GFS2

Create volumes on shared storage and format with GFS2. It's OK to set on a node. On this example, it is set on sdb and create partitions on it and set LVM type with fdisk.

[root@gd9109 ~]# pvcreate /dev/vdb1

[root@gd9109 ~]# vgcreate -cy vg_cluster /dev/vdb1

[root@gd9109 ~]# lvcreate -l100%FREE -n lv_cluster vg_cluster

[root@gd9109 ~]# mkfs.gfs2 -p lock_dlm -t ha_cluster:gfs2 -j 2 /dev/vg_cluster/lv_cluster

Add shared storage to cluster resource. It's OK to set on a node.

[root@gd9109 ~]# pcs resource create fs_gfs2 Filesystem device="/dev/vg_cluster/lv_cluster" directory="/opt/zimbra" fstype="gfs2" options="noatime,nodiratime" op monitor interval=10s on-fail=fence clone interleave=true

[root@gd9109 ~]# pcs constraint order start clvmd-clone then fs_gfs2-clone

[root@gd9109 ~]# pcs constraint colocation add fs_gfs2-clone with clvmd-clone

[root@gd9109 ~]# pcs constraint show

Location Constraints:

Ordering Constraints:

start dlm-clone then start clvmd-clone (kind:Mandatory)

start clvmd-clone then start fs_gfs2-clone (kind:Mandatory)

start fs_gfs2-clone then start fs_bkp (kind:Mandatory)

start fs_gfs2-clone then start Zimbra_Service (kind:Mandatory)

Colocation Constraints:

clvmd-clone with dlm-clone (score:INFINITY)

fs_gfs2-clone with clvmd-clone (score:INFINITY)

Create Fence through rhev manager:

[root@gd9109 ~]# pcs stonith create rhevfence fence_rhevm stonith-timeout=120 pcmk_host_map="GD9109.gstn.org.in:GD9109 GD9110.gstn.org.in:GD9110" ipaddr=172.18.102.22 ssl=1 login=cluster_admin passwd=XXXXXXX