How to change the hostname of your Virtual Compute Nodes

How to change the hostname of your Virtual Compute Nodes

Change Virtual Compute Nodes Hostname
Please follow the below steps to change the hostname of your Virtual Compute Node.
Step 1: Login
Login to your Virtual Compute Node as a root user.
Step 2: Check Hostname
To check the current hostname of your server, run the command 
hostname
To change the hostname of your server, type new name followed by hostname 
hostname new-name
Step 3: Edit the network configuration file
For CentOS Change the hostname under the path /etc/sysconfig/network 
vi /etc/sysconfig/network
Edit the content of the file so that it looks like this 
HOSTNAME=new-name
Ubuntu/Debian Next, edit the /etc/hostname file and update hostname: 
vi /etc/hostname
Step 4: Edit the hosts file
Edit the /etc/hosts file and update your old-host-name: 
vi /etc/hosts
Now save and exit the file.
Step 5: Save Hostname permanently
Immediately after executing the previous command, the hostname is changed, but the change will last only until the next reboot. To permanently change the hostname, the next step is to run the following command in your terminal 
cd /etc/one-context.d/
This will take you inside the directory one-context.d List the contents of the directory by running the following command, 
ls -la
You will see the following result 
drwxr-xr-x  2 root root 4096 Oct 26 19:48 .
drwxr-xr-x 72 root root 4096 Jan 21 15:04 ..
-rwxr-xr-x  1 root root 4433 Jan 15  2015 00-network
-rwxr-xr-x  1 root root 1991 Jan 15  2015 01-dns
-rwxr-xr-x  1 root root 1720 Jul 12  2016 02-ssh_public_key
-rwxr-xr-x  1 root root   28 Jan 15  2015 03-selinux-ssh
-rwxr-xr-x  1 root root   15 Jan 15  2015 04-mount-swap
-rwxr-xr-x  1 root root  614 Jan 15  2015 05-hostname
-rwxr-xr-x  1 root root  297 Jan 15  2015 99-execute-scripts
We need to move the directory 05-hostname to root folder. To execute this run the following command in the terminal. 
mv 05-hostname /root/
Now your hostname is changed permanently.

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