MRS Becomes Abnormal After hostname Modification

Issue

What should I do if MRS becomes abnormal after hostname is modified?

Symptom

MRS becomes abnormal after hostname is modified.

Possible Cause

The hostname modification causes compatibility problems and faults.

Procedure

1. Log in to any node in the cluster as user root.
2. Run the cat /etc/hosts command on the node to check the value of hostname of each node and set the newhostname variable based on the value.
3. Run the sudo hostnamectl set-hostname ${newhostname} command on the node where hostname is modified to restore the correct hostname.
   

   ${newhostname}: new value of hostname

4. After the modification, log in to the node where hostname is modified, and check whether the new hostname takes effect.