Corosync and Pacemaker
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This document discusses Corosync and Pacemaker, which are open source cluster management and resource management tools. Corosync provides messaging, membership, and quorum services, while Pacemaker acts as a cluster resource manager that can monitor resources and move them between nodes as needed. Resources can be configured as clones, which have multiple instances across nodes, or as master-slave, where one node is active and others are backups. Pacemaker uses resource agents to monitor specific services and resources. The document provides examples of configuring and clustering an Apache web server and IP address.
Corosync and Pacemaker
- 8. ArchitectureArchitecture ➢ Corosync ➢ A messaging and membership layer ➢ Quorum information (odd number of nodes) ➢ Pacemaker ➢ Cluster Resource Manager ➢ resource-agents
- 9. ManagementManagement ➢ crmsh ➢ Cluster Resource Manager shell ➢ pcs ➢ Pacemaker configuration system
- 10. Easy clusterEasy cluster node tom node jerry primitive apache lsb:apache op monitor interval=2s target-role=Started primitive ip-10 IPaddr2 params ip=122.12.31.10 cidr_netmask=24 nic=bond0 On tom: # iptables -t nat -I PREROUTING -j DNAT -d 122.12.31.10 -p tcp --dport 80 --to 10.0.0.1:80 On jerry: # iptables -t nat -I PREROUTING -j DNAT -d 122.12.31.10 -p tcp --dport 80 --to 10.0.0.2:80
- 11. Config 1Config 1 node luke attributes standby=off node leia attributes standby=off node han attributes standby=off primitive apache lsb:apache op monitor interval=2s target-role=Started primitive bind lsb:named op monitor interval=5s target-role=Started primitive cron-migrate lsb:cron-migrate op monitor interval=15s target-role=Started meta is-managed=true target-role=Started primitive ip-10 IPaddr2 params ip=122.12.31.10 cidr_netmask=24 nic=bond0 primitive ip-11 IPaddr2 params ip=122.12.31.11 cidr_netmask=24 nic=bond0
- 12. Config 2Config 2 clone apache-clone apache meta clone-max=3 clone-node-max=1 globally-unique=false ordered=false interleave=false target-role=Started clone bind-clone bind meta clone-max=3 clone-node-max=1 globally-unique=false ordered=false interleave=false target-role=Started
- 13. Config 3Config 3 location cli-prefer-cron-migrate cron-migrate role=Started inf: luke colocation dont-put-cron-with-webs -100: cron-migrate ( ip-10 ip-11 ) property cib-bootstrap-options: dc-version=1.1.10-14.el6_5.2-368c726 cluster-infrastructure="classic openais (with plugin)" expected-quorum-votes=3 stonith-enabled=false is-managed-default=true maintenance-mode=false no-quorum-policy=ignore rsc_defaults rsc-options: resource-stickiness=100
- 14. ConceptsConcepts ➢ Resource = service ➢ clone = multiple instances of a resource ➢ ms = master-slave instances of a resource
- 15. Types of servicesTypes of services ➢ LSB - linux standard base ➢ can be used for basic stuff ➢ /etc/init.d/resource ➢ OCF - Open Cluster Framework ➢ required for ms resources ➢ /usr/lib/ocf/resource.d/heartbeat
- 16. LogicLogic ➢ ordering ➢ location constrains ➢ co-location constrains
- 17. AlternativesAlternatives ➢ Nomad - www.nomadproject.io ➢ VRRP ➢ vrrpd - github.com/fredbcode/Vrrpd ➢ keepalived - www.keepalived.org All of the above lack the resource agent scripts and notion for MS and Cloned resources
- 18. Thank YouThank You IRC: irc.freenode.net hackman ICQ: 7556201 Jabber: hackman@jabber.com E-Mail: mm@1h.com