This document discusses Red Hat HA cluster configuration with Pacemaker. It describes the core components of Red Hat clusters including the cluster infrastructure, high availability service management, administration tools, and third party components. It also covers key aspects of cluster configuration like cluster management, lock management, fencing, and using Pacemaker to create the cluster, add fencing devices, and define resources.

1. REDHAT HA CLUSTER WITH
PACEMAKER
Indika Dias

2. REDHAT CLUSTER MODE
 Storage
 High Availability
 Load Balancing
 High Performance

3. REDHAT CLUSTER SUIT COMPONENTS
 Cluster infrastructure
Basic functions to work as a cluster
 High-availability Service Management
Provide failover services from one node to other
 Cluster administration tools
Setting up ,configuring, Management cluster
 Linux Virtual Server (LVS)
For IP Load Balancing
3rd Party components
GFS/GFS2 -Cluster file system used with RHCS
CLVM -Cluster logical volume manager –Volume management with
RHCS
GNBD -Global Network Block Device – making available of block
storage to GFS

5. CLUSTER INFRASTRUCTURE
 Cluster Management
 Lock Management
 Fencing
 Cluster configuration Management

6. CLUSTER MANAGEMENT
 Manage cluster quorum & cluster management
 CMAN distributed in all nodes
 Cluster quorum prevent stopping of services if half
or fewer nodes are active by allowing cluster
instances to access resources without other
instances involvement

7. LOCK MANAGEMENT
 To synchronize cluster nodes access to shared
resources.
GFS - synchronize access to file meta data
CLVM- synchronize update to LVM

8. FENCING
 Disconnection of node from cluster’s shared
storage
o Power fencing
integrate
HP ilo,DRAC/MC,Blade centers
external
WTI power controllers
o SCSI3 Persistent Reservation Fencing
o Fiber Channel switch fencing
o GNBD Fencing

9. POWER FENCING

12. CLUSTER CONFIGURATION SYSTEM
 Make sure cluster configuration up to date in every
node

13. CLUSTER CREATION WITH PCS
 Pacemaker is cluster resource manager
detection of services-level or node failure &
recovery
No requirement of shared storage
Support quorate & resource driven clusters
support service types
Clones : service should up in multiple
nodes
Multi-state service with multi-mode

16. #yum install pcs fence-agents
#pcs cluster auth node1 node2 -u hacluster –p
password
#pcs cluster --start –name clustername node1 node2
#pcs cluster enable –all

17. CREATE FENCING DEVICE
#pcs stonith list
#pcs create vmstonth fence_hpblade auth=password
ipaddr=192.168.0.1 login=Administrator
passwd=password

18. CREATE CLUSTER RESOURCES
#pcs resource create virtualip IPaddr2
ip=192.168.100.20 cidr_netmask=24 monitor
interval=30s
#pcs resource create web apache
configfile=/etc/httpd/conf/httpd.conf –group apache

19. MONITOR CLUSTER
#pcs status
#pcs cluster status
#pcs cluster stop –all
#pcs cluster kill