RHCS6: Basic operations on clustered services

RHCS: Basic operations on clustered services

# 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
0 (0)
Article Rating (No Votes)
Rate this article
Attachments
There are no attachments for this article.
Comments
There are no comments for this article. Be the first to post a comment.
Full Name
Email Address
Security Code Security Code
Related Articles RSS Feed
how to list all hard disks in linux from command line
Viewed 438 times since Mon, Jan 28, 2019
Manage Linux Password Expiration and Aging Using chage
Viewed 1168 times since Tue, Sep 11, 2018
Get UUID of Hard Disks [Update]
Viewed 511 times since Tue, Jul 17, 2018
List DNS records, nameservers of a domain from command line
Viewed 455 times since Sun, Sep 30, 2018
RHCS6: Debug and test multicast traffic between two hosts
Viewed 634 times since Sun, Jun 3, 2018
Check a Website Availability from the Linux Command Line
Viewed 434 times since Mon, Feb 18, 2019
How to maximise SSD performance with Linux
Viewed 143 times since Fri, May 15, 2020
RHEL: Resize/disable /dev/shm filesystem
Viewed 1067 times since Sun, May 27, 2018
Linux Find Large Files
Viewed 563 times since Mon, Oct 29, 2018
HP-UX - Stunnel Configuration
Viewed 427 times since Fri, Sep 28, 2018