Linux High Availability Cluster — part 1
3 min readOct 18, 2022
step-by-step guide to building a simple high-availability cluster using Pacemaker
in this part of HA cluster will learn:
- Setup cluster on RHEL/CentOS Stream 9 as the host operating system
- Configure storage based fencing by using SCSI storage
- Access to Web GUI
Architecture
we will work with 2 nodes, and will Configure storage based fencing by using SCSI storage like the bellow diagram.
+-----------------+
| |
| ISCSI Target |
| |
+--------|--------+
|
+------------+ | +------------+
| | | | |
| Node-1 <--------v--------> Node-2 |
| | | |
+------------+ +------------+Installing cluster software
do the following command with both nodes
enable the repository for high availability
# on rhel-9
subscription-manager repos --enable=rhel-9-for-x86_64-highavailability-rpms# on centos Stream 9
dnf config-manager --set-enabled highavailability
