Setting up a multi-tiered log infrastructure Part 10 -- HA Cluster Setup

Linux, Logging, Security, Sys Admin

Setup HA Cluster Services on CentOS 7

Install HA Cluster components

Install pacemaker and the cluster control software on both nodes that will be part of the cluster(corosync is pulled in as a dependency)

yum install pacemaker pcs

Enable and start the cluster management service

  • systemctl enable pcsd.service
  • systemctl start pcsd.service

Enable corosync and pacemaker to start on boot on all nodes

  • systemctl enable corosync.service
  • systemctl enable pacemaker.service

Set the hacluster user’s password

set hacluster password

Pa$$w0rd

Configure firewalld rules for HA Cluster

Now that the config file is edited, let’s make some firewall rule changes. If for some reason you aren’t using a firewall then you can skip this.

Configure a default zone with firewalld (The default zone is assumed to already be set as “Internal”)

Add services (or ports) to allowed rules

firewall-cmd --permanent --zone=internal --add-service=high-availability

You can just define ports if you like

  • firewall-cmd --zone=internal --add-port=2224/tcp
  • firewall-cmd --zone=internal --add-port=3121/tcp
  • firewall-cmd --zone=internal --add-port=5404/udp
  • firewall-cmd --zone=internal --add-port=5405/udp
  • firewall-cmd --zone=internal --add-port=21064/udp

Finalize cluster configuration

Setup cluster auth (use hacluster and the pass that was set)

pcs cluster auth

Setup cluster (select the appropriate names and nodes)

pcs cluster setup --name lognode-ha lognode01 lognode02

Start the cluster from a single node

pcs cluster start --all

or run this on all nodes

  • systemctl start corosync.service
  • systemctl start pacemaker.service

Check cluster status (next three commands)

  • pcs status cluster
  • pcs status nodes
  • pcs status corosync

Disable “Shoot The Other Node In the Head” (STONITH) functionality

pcs property set stonith-enabled=false

Disable quorum policy because we only have two nodes

pcs property set no-quorum-policy=ignore

Display list of cluster properties

pcs property

Create a resource for the shared IP

pcs resource create SharedIP ocf:heartbeat:IPaddr2 ip=xxx.xxx.xxx.xxx cidr_netmask=32 op monitor interval=10s

Verify cluster functionality

pcs status resources