Set hostname in CentOS 7

Hostname is a sub domain. To set hosting, edit file

Add

Example

Now run

Example

Run

Edit file

Edit or add HOSTNAME entry

Reboot the server with

You can verify hostname with command

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Set Permanant hostname on AWS EC2 CentOS 7 server

On AWS EC2 when you boot, hostname set something like ip-172-31-41-172.eu-central-1.compute.internal

To chaneg this, run

Example

To disable change of hostname, run

Now reboot your server with