[ClusterLabs] Why my node1 couldn't back to the clustering chain?
kgaillot at redhat.com
Thu Apr 8 10:55:47 EDT 2021
On Thu, 2021-04-08 at 14:32 +0000, Jason Long wrote:
> Why, when node1 is back, then web server still on node2? Why not
By default, there are no preferences as to where a resource should run.
The cluster is free to move or leave resources as needed.
If you want a resource to prefer a particular node, you can use
location constraints to express that. However there is rarely a need to
do so; in most clusters, nodes are equally interchangeable.
> On Thursday, April 8, 2021, 06:49:38 PM GMT+4:30, Ken Gaillot <
> kgaillot at redhat.com> wrote:
> On Thu, 2021-04-08 at 14:14 +0000, Jason Long wrote:
> > Hello,
> > I stopped node1 manually as below:
> > [root at node1 ~]# pcs cluster stop node1
> > node1: Stopping Cluster (pacemaker)...
> > node1: Stopping Cluster (corosync)...
> > [root at node1 ~]#
> > [root at node1 ~]# pcs status
> > Error: error running crm_mon, is pacemaker running?
> > Could not connect to the CIB: Transport endpoint is not connected
> > crm_mon: Error: cluster is not available on this node
> > And after it, I checked my cluster logs:
> > https://paste.ubuntu.com/p/9KNyt5nB79/
> > Then, I started node1:
> > [root at node1 ~]# pcs cluster start node1
> > node1: Starting Cluster...
> > [root at node1 ~]#
> > And checked my cluster logs again:
> > https://paste.ubuntu.com/p/GQFbdhMvV3/
> > The status of my cluster is:
> > # pcs status
> > Cluster name: mycluster
> > Cluster Summary:
> > * Stack: corosync
> > * Current DC: node2 (version 2.0.5-10.fc33-ba59be7122) -
> > partition
> > with quorum
> > * Last updated: Thu Apr 8 18:33:49 2021
> > * Last change: Thu Apr 8 17:18:49 2021 by root via cibadmin on
> > node1
> > * 2 nodes configured
> > * 3 resource instances configured
> > Node List:
> > * Online: [ node1 node2 ]
> > Full List of Resources:
> > * Resource Group: apache:
> > * httpd_fs (ocf::heartbeat:Filesystem): Started node2
> > * httpd_vip (ocf::heartbeat:IPaddr2): Started node2
> > * httpd_ser (ocf::heartbeat:apache): Started node2
> > Daemon Status:
> > corosync: active/enabled
> > pacemaker: active/enabled
> > pcsd: active/enabled
> > But, I can't browse the Apache web server? Why?
> > Thanks.
> Based on the above status output, the web server is running on node2,
> using the IP address specified by the httpd_vip resource. Are you
> trying to contact the web server at a name corresponding to that IP?
Ken Gaillot <kgaillot at redhat.com>
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