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

Symptom

Cause Analysis

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.
   Note

   ${newhostname}: new value of hostname

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