Re: [ClusterLabs] start one node only?
On 08/24/2017 04:24 PM, Ken Gaillot wrote: > How could it know that, from a cold boot? It doesn't know if the other > node is down, or up but unreachable. wait_for_all is how to keep that > fencing from happening at every cluster start, but the trade-off is you > can't cold-boot a partial cluster. OK, thanks. -- Dimitri Maziuk Programmer/sysadmin BioMagResBank, UW-Madison -- http://www.bmrb.wisc.edu signature.asc Description: OpenPGP digital signature ___ Users mailing list: Users@clusterlabs.org http://lists.clusterlabs.org/mailman/listinfo/users Project Home: http://www.clusterlabs.org Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf Bugs: http://bugs.clusterlabs.org
Re: [ClusterLabs] start one node only?
On Thu, 2017-08-24 at 15:53 -0500, Dimitri Maziuk wrote: > On 08/24/2017 03:40 PM, Ken Gaillot wrote: > > > You could set wait_for_all to 0 in corosync.conf, then boot. The living > > node should try to fence the other one, and proceed if fencing succeeds. > > Didn't I just read a thread that says it won't: the other node is > already down? How could it know that, from a cold boot? It doesn't know if the other node is down, or up but unreachable. wait_for_all is how to keep that fencing from happening at every cluster start, but the trade-off is you can't cold-boot a partial cluster. -- Ken Gaillot ___ Users mailing list: Users@clusterlabs.org http://lists.clusterlabs.org/mailman/listinfo/users Project Home: http://www.clusterlabs.org Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf Bugs: http://bugs.clusterlabs.org
Re: [ClusterLabs] start one node only?
On 08/24/2017 03:40 PM, Ken Gaillot wrote: > You could set wait_for_all to 0 in corosync.conf, then boot. The living > node should try to fence the other one, and proceed if fencing succeeds. Didn't I just read a thread that says it won't: the other node is already down? -- Dimitri Maziuk Programmer/sysadmin BioMagResBank, UW-Madison -- http://www.bmrb.wisc.edu signature.asc Description: OpenPGP digital signature ___ Users mailing list: Users@clusterlabs.org http://lists.clusterlabs.org/mailman/listinfo/users Project Home: http://www.clusterlabs.org Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf Bugs: http://bugs.clusterlabs.org
Re: [ClusterLabs] start one node only?
On Thu, 2017-08-24 at 15:10 -0500, Dimitri Maziuk wrote: > Hi everyone, > > I seem to remember seeing theis once before, but my google-fu is > failing: I've a 2-node active-passive cluster, when I power up one node > only, resources remain stopped. Is there a way to boot a cluster on one > node only? > > -- Note that if I boot up the other node everything starts, and then I > can shut one of them down and it'll keep running. But that doesn't seem > to happen when starting cold. > > What am I missing? > > TIA That's a fail-safe. You're probably using corosync's wait_for_all option (most likely via the two_node option). See the votequorum(5) man page for details. You could set wait_for_all to 0 in corosync.conf, then boot. The living node should try to fence the other one, and proceed if fencing succeeds. You may want to set wait_for_all back to 1 once your cluster is back to normal. -- Ken Gaillot ___ Users mailing list: Users@clusterlabs.org http://lists.clusterlabs.org/mailman/listinfo/users Project Home: http://www.clusterlabs.org Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf Bugs: http://bugs.clusterlabs.org
Re: [ClusterLabs] start one node only?
PS. centos 7.latest w/ the current pcs/corosync/pacemaker rpms as distributed by centos, resources are stonith:fence_scsi, IPaddr2, and ZFS. -- Dimitri Maziuk Programmer/sysadmin BioMagResBank, UW-Madison -- http://www.bmrb.wisc.edu signature.asc Description: OpenPGP digital signature ___ Users mailing list: Users@clusterlabs.org http://lists.clusterlabs.org/mailman/listinfo/users Project Home: http://www.clusterlabs.org Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf Bugs: http://bugs.clusterlabs.org
[ClusterLabs] start one node only?
Hi everyone, I seem to remember seeing theis once before, but my google-fu is failing: I've a 2-node active-passive cluster, when I power up one node only, resources remain stopped. Is there a way to boot a cluster on one node only? -- Note that if I boot up the other node everything starts, and then I can shut one of them down and it'll keep running. But that doesn't seem to happen when starting cold. What am I missing? TIA -- Dimitri Maziuk Programmer/sysadmin BioMagResBank, UW-Madison -- http://www.bmrb.wisc.edu signature.asc Description: OpenPGP digital signature ___ Users mailing list: Users@clusterlabs.org http://lists.clusterlabs.org/mailman/listinfo/users Project Home: http://www.clusterlabs.org Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf Bugs: http://bugs.clusterlabs.org
