CentOS 7 / RHEL 7 – AWS ec2 – how to set hostname persistent across reboots

Issue

• how to set hostname persistent across reboots in CentOS 7 / RHEL 7 on AWS ec2
• CentOS 7 / RHEL 7 Hostname changes after reboots in aws ec2

Solution

• Set the hostname with the below command
  hostnamectl set-hostname hostname.yourdomainname.com
• Now run the below to change the cloud.cfg
  echo "preserve_hostname: true" >> /etc/cloud/cloud.cfg
• Reboot the server with reboot command
  reboot
  Now the server will be running with the persistent hostname after reboots.