[ClusterLabs] Why my node1 couldn't back to the clustering chain?

[Jason Long]

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.