Dne 17.4.2017 v 17:28 Ken Gaillot napsal(a):
On 04/13/2017 01:11 PM, Scott Greenlese wrote:
Hi,
I need to remove some nodes from my existing pacemaker cluster which are
currently unbootable / unreachable.
Referenced
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/High_Availability_Add-On_Reference/s1-clusternodemanage-HAAR.html#s2-noderemove-HAAR
*4.4.4. Removing Cluster Nodes*
The following command shuts down the specified node and removes it from
the cluster configuration file, corosync.conf, on all of the other nodes
in the cluster. For information on removing all information about the
cluster from the cluster nodes entirely, thereby destroying the cluster
permanently, refer to _Section 4.6, “Removing the Cluster
Configuration”_
<https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/High_Availability_Add-On_Reference/s1-clusterremove-HAAR.html#s2-noderemove-HAAR>.
pcs cluster node remove /node/
I ran the command with the cluster active on 3 of the 5 available
cluster nodes (with quorum). The command fails with:
[root@zs90KP VD]# date;*pcs cluster node remove zs93kjpcs1*
Thu Apr 13 13:40:59 EDT 2017
*Error: pcsd is not running on zs93kjpcs1*
The node was not removed:
[root@zs90KP VD]# pcs status |less
Cluster name: test_cluster_2
Last updated: Thu Apr 13 14:08:15 2017 Last change: Wed Apr 12 16:40:26
2017 by root via cibadmin on zs93KLpcs1
Stack: corosync
Current DC: zs90kppcs1 (version 1.1.13-10.el7_2.ibm.1-44eb2dd) -
partition with quorum
45 nodes and 180 resources configured
Node zs95KLpcs1: UNCLEAN (offline)
Online: [ zs90kppcs1 zs93KLpcs1 zs95kjpcs1 ]
*OFFLINE: [ zs93kjpcs1 ]*
Is there a way to force remove a node that's no longer bootable? If not,
what's the procedure for removing a rogue cluster node?
Thank you...
Scott Greenlese ... KVM on System Z - Solutions Test, IBM Poughkeepsie, N.Y.
INTERNET: swgre...@us.ibm.com
Yes, the pcs command is just a convenient shorthand for a series of
commands. You want to ensure pacemaker and corosync are stopped on the
node to be removed (in the general case, obviously already done in this
case), remove the node from corosync.conf and restart corosync on all
other nodes, then run "crm_node -R <nodename>" on any one active node.
Hi Scott,
It is possible to remove an offline node from a cluster with upstream
pcs 0.9.154 or RHEL pcs-0.9.152-5 (available in RHEL7.3) or newer.
If you have an older version, here's a workaround:
1. run 'pcs cluster localnode remove <nodename>' on all remaining nodes
2. run 'pcs cluster reload corosync' on one node
3. run 'crm_node -R <nodename> --force' on one node
It's basically the same procedure Ken described.
See https://bugzilla.redhat.com/show_bug.cgi?id=1225423 for more details.
Regards,
Tomas
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