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Re: [Linux-cluster] What is the proper procedure to reboot a node in acluster?

Thank you all.
The problem I have is that I don't seem to be able to get out of the cluster gracefully, even if I stop the services manually in the right order.
For example, I joined the cluster manually by starting cman, clvmd and gfs2 in the order and everything is working just fine.

Then I wanted to reboot. This time, I want to do it manually so I went to stop the services in order.
[root test2 ~]# service gfs2 stop
Unmounting GFS2 filesystem (/vrstorm):                     [  OK  ]
[root test2 ~]# service clvmd stop
Signaling clvmd to exit                                    [  OK  ]
Waiting for clvmd to exit:                                 [FAILED]
clvmd failed to exit                                       [FAILED]

Somehow clvmd cannot be stopped. I still have the process running
root      2646  0.0  0.5 194476 45016 ?        SLsl 02:18   0:00 clvmd -T30

How do I stop clvmd gracefully? I am running RHEL-6.
[root test2 ~]# uname -a
Linux test2 2.6.32-71.18.2.el6.x86_64 #1 SMP Wed Mar 2 14:17:40 EST 2011 x86_64 x86_64 x86_64 GNU/Linux
[root test2 ~]# cat /etc/redhat-release 
Red Hat Enterprise Linux Server release 6.0 (Santiago)

Thank you very much.


On Thu, Mar 10, 2011 at 1:41 PM, Alvaro Jose Fernandez <alvaro fernandez sivsa com> wrote:



Given fencing is properly configured, I think the default boot/sshutdown RHCS scripts should work. I too use two_node (but no clvmd) in RHEL5.5 with latest updates to cman and rgmanager, and a shutdown -r works well (and a shutdown -h too). The other node cluster daemon should log this as a node shutdown in /var/log/messages, and it should adjust quorum, and not trigger a fencing action over the other node.


If one halts and poweroff via shutdown -h one of the two nodes, and then reboots (via shutdown -r) the surviving node, the surviving node will fence the other. We have power switch fencing, and it should simply suceed (making a power  off then a power on on the other node's outlets). Once this fencing suceeds, the boot sequence continues and the node assumes quorum.


If later the other node is powered on, it should join the cluster without problems.




Hi there,


I've setup a two-node cluster with cman, clvmd and gfs2. I don't use qdisk but had

<cman expected_votes="1" two_node="1"/>


I would like to know what is the proper procedure to reboot a node in the two-node cluster (maybe this applies for all size?) when both nodes are functioning fine but I just want to reboot one for some reason (for example, upgrade kernel). Is there a preferred/better way to reboot the machine rather than just running the "reboot" command as root. I have been doing the "reboot" command so far and it sometimes creates problems for us, including  making the other node to fail. 


Thank you very much.
Shi Jin, Ph.D.

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Linux-cluster redhat com

Shi Jin, Ph.D.

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