Tag: hostname

Set hostname in CentOS 7
Hostname is a sub domain. To set hosting, edit file
```
vi /etc/hosts
```
Add
```
SERVER_IP_HERE HOSTNAME.yourdomain.com HOSTNAME
```
Example
```
72.21.51.194 server32.serverok.in server32
```
Now run
```
echo HOSTNAME.yourdomain.com > /etc/hostname
```
Example
```
echo server32.serverok.in > /etc/hostname
```
Run
```
/bin/hostname -F /etc/hostname
```
Edit file
```
vi /etc/sysconfig/network
```
Edit or add HOSTNAME entry
```
NETWORKING=yes
HOSTNAME=HOSTNAME.yourdomain.com
```
Reboot the server with
```
reboot
```
You can verify hostname with command
```
hostname
```
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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
```
hostnamectl set-hostname --static HOSTNAME_HERE
```
Example
```
hostnamectl set-hostname --static server1.serverok.in
```
To disable change of hostname, run
```
echo "preserve_hostname: true" > /etc/cloud/cloud.cfg.d/99_hostname.cfg
```
Now reboot your server with
```
reboot
```
Back to hostname
March 25, 2019