随风飞行

1. Login to your server: ssh user@server-name

2. Become a root user using either sudo -s or su -

3. To set the hostname to server1, run: hostnamectl set-hostname server1

4. Edit the file /etc/hosts and update entries: vi /etc/hosts

5. Verify it by running the hostnamectl command again.

hostnamectl set-hostname server1