Redhat ha cluster with pacemaker
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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.
Redhat ha cluster with pacemaker
- 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
- 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