As a Linux System admin, we always love to work on CentOS and RHEL. In my case i had to launch a CentOS7 instance from the AWS Marketplace again. When we set the hostname with hostnamectl and reboot, yes the Instance comes with the default hostname again. So i have thought of documenting it here, so that it may be helpful for you as well !!
- You have launched a CentOS 7 Instance from AWS Marketplace.
- You have ran hostnamectl and rebooted the instance, but the hostname didnt became persistent.
- Set hostname with hostnamectl command
hostnamectl set-hostname server1.example.com
- Assign the hostname in /etc/sysconfig/network file
vim /etc/sysconfig/network NETWORKING=yes NOZEROCONF=yes HOSTNAME=server1.example.com
- Update the cloud.cfg file and set preserve_hostname to true
vi /etc/cloud/cloud.cfg preserve_hostname: true
- Now reboot the server
- The server will bootup with the new persistent hostname. Please comment, if you have faced any issues with this.