MRS Cluster Becomes Abnormal After the Hostname of a Node Is Changed

Symptom

After the hostname of a node is changed, the MRS cluster becomes abnormal.

Cause Analysis

Changing the hostname 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 changed to restore the correct hostname.
   

   ${newhostname}: new value of hostname

4. Log in to the node where hostname is changed, and check whether the new hostname takes effect.