RHCS6: Basic operations on clustered services
Article Number: 197 | Rating: Unrated | Last Updated: Sun, Jun 3, 2018 9:36 AM
RHCS: Basic operations on clustered services
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# Tested on RHEL 6
# On a cluster like following one: root@mynodeA:/#> clustat Cluster Status for mycluster @ Thu Sep 25 21:39:54 2014 Member Status: Quorate Member Name ID Status ------ ---- ---- ------ mynodeA 1 Online, Local, rgmanager mynodeB 2 Online, rgmanager Service Name Owner (Last) State ------- ---- ----- ------ ----- service:myservice-1 mynodeA started service:myservice-2 mynodeA started service:myservice-3 mynodeB started # Stop a service ('-d' for "disable") # ------------------------------------------------------------------------------------------ root@mynodeA:/#> clusvcadm -d myservice-2 root@mynodeA:/#> clustat Cluster Status for mycluster @ Thu Sep 25 21:40:22 2014 Member Status: Quorate Member Name ID Status ------ ---- ---- ------ mynodeA 1 Online, Local, rgmanager mynodeB 2 Online, rgmanager Service Name Owner (Last) State ------- ---- ----- ------ ----- service:myservice-1 mynodeA started service:myservice-2 (mynodeA) disabled service:myservice-3 mynodeB started # Start a stopped service ('-e' for "enable") # ------------------------------------------------------------------------------------------ # To be able to start a service it has to be in 'disabled' status. Sometimes the service # may be in 'failed' status (neither 'started' nor 'disabled'), what means that there has # been a problem with the service. In those cases, after solving the problems that # potentially prevent the service from starting, we should run once again stop command, # "clusvcadm -d" on the service in order to pass it to 'disabled' status. # Obviously, when starting a service, we have to indicate on which node we want to start # it ('-m' parameter) root@mynodeA:/#> clusvcadm -e myservice-2 -m mynodeB root@mynodeA:/#> clustat Cluster Status for mycluster @ Thu Sep 25 21:45:17 2014 Member Status: Quorate Member Name ID Status ------ ---- ---- ------ mynodeA 1 Online, Local, rgmanager mynodeB 2 Online, rgmanager Service Name Owner (Last) State ------- ---- ----- ------ ----- service:myservice-1 mynodeA started service:myservice-2 mynodeB started service:myservice-3 mynodeB started # If service was in 'failed' status, first pass it to 'disabled' root@mynodeA:/#> clustat Cluster Status for mycluster @ Thu Sep 25 21:43:21 2014 Member Status: Quorate Member Name ID Status ------ ---- ---- ------ mynodeA 1 Online, Local, rgmanager mynodeB 2 Online, rgmanager Service Name Owner (Last) State ------- ---- ----- ------ ----- service:myservice-1 mynodeA started service:myservice-2 (mynodeA) failed service:myservice-3 mynodeB started root@mynodeA:/#> clusvcadm -d myservice-2 root@mynodeA:/#> clustat Cluster Status for mycluster @ Thu Sep 25 21:44:01 2014 Member Status: Quorate Member Name ID Status ------ ---- ---- ------ mynodeA 1 Online, Local, rgmanager mynodeB 2 Online, rgmanager Service Name Owner (Last) State ------- ---- ----- ------ ----- service:myservice-1 mynodeA started service:myservice-2 (mynodeA) disabled service:myservice-3 mynodeB started # Switch a service to a different node ('-r' for "relocate") # ------------------------------------------------------------------------------------------ # When starting a service, we have to indicate on which node we want to start # it ('-r' parameter) root@mynodeA:/#> clustat Cluster Status for mycluster @ Thu Sep 25 21:45:17 2014 Member Status: Quorate Member Name ID Status ------ ---- ---- ------ mynodeA 1 Online, Local, rgmanager mynodeB 2 Online, rgmanager Service Name Owner (Last) State ------- ---- ----- ------ ----- service:myservice-1 mynodeA started service:myservice-2 mynodeB started service:myservice-3 mynodeB started root@mynodeA:/#> clusvcadm -r myservice-2 -m mynodeA root@mynodeA:/#> clustat Cluster Status for mycluster @ Thu Sep 25 21:49:29 2014 Member Status: Quorate Member Name ID Status ------ ---- ---- ------ mynodeA 1 Online, Local, rgmanager mynodeB 2 Online, rgmanager Service Name Owner (Last) State ------- ---- ----- ------ ----- service:myservice-1 mynodeA started service:myservice-2 mynodeA started service:myservice-3 mynodeB started |
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