I want to create a shell script that can change the hostname of my Ubuntu permanently. Whenever I use the hostname New_hostname command, it returns to the original hostname after I restart the machine.
I found out that the only way I can change this permanently is by modifying the file in /etc/hostname and save it. Is there some way I can do this using a shell script only? I also have a password.
The hostnamectl combines setting the hostname via the hostname command and editing /etc/hostname. Unfortunately, editing /etc/hosts still has to be done separately.
hostnamectl set-hostname <new-hostname>
Type
echo "myNewHostName" > /etc/hostname
in any shell with root access near you..
You may also want to take a look at the file /etc/hosts, cf. http://pricklytech.wordpress.com/2013/04/24/ubuntu-change-hostname-permanently-using-the-command-line/.
Hostname changing via SSH is reverted after reboot in Ubuntu 18.04. Make permanent change as following way.
sudo nano /etc/cloud/cloud.cfg
Set preserve_hostname to true
preserve_hostname: true
hostnamectl set-hostname new-host-name
sudo reboot
/etc/hosts
127.0.0.1 persistent_host_name
/etc/hostname
persistent_host_name
Apply changes Immediately
$ sudo hostname persistent_host_name
Check changes
$ hostname
persistent_host_name
A hostname is a label that identifies a machine on the network. You shouldn’t use the same hostname on two different machines on a same network.
Change the hostname using hostnamectl command. If you want to change the hostname to new_hostname
sudo hostnamectl set-hostname new_hostname
It will not change the hostname directly. You want to preserve the changes permanently then you have to edit cloud.cfg file
sudo nano /etc/cloud/cloud.cfg
# This will cause the set+update hostname module to not operate (if true)
preserve_hostname: true
Save the file and close your editor.
You can verify your changes using command hostnamectl it will show new_hostname under Static hostname
PS: Source Link
Typically, you would need to change it in these files:
/etc/hostname
/etc/hosts
If you are using some advanced printers, also here:
/etc/printcap
This is why I would recommend doing it manually - but search the old hostnames first. To find all occurrences in /etc:
sudo grep -iRI "_OLDHOSTNAME_" /etc 2>/dev/null
Then change the _OLDHOSTNAME_ in every occurrence. Done.
To chaneg the Hostname permanet in ubuntu machine
Go to :
#vim /etc/hostname
Type the hostname inside the file you want to set for the machine
Then save and the file
After saving the document run this command
# hostname -F /etc/hostname
Then edit the /etc/hosts file
#vim /etc/hosts
type the ip hostname inside the file
Then Logout of of the machine and relogin into the machine
If you just want to change host name, because its getting displayed as a command prompt in the terminal. Then you can replace \h in PS1 with "desired_host_name" in ~/.bashrc
Like in ~/.bashrc put this line at end of file:
export PS2="continue-> ";
export PS1="\u@3050:~$ ";
