Ubuntu 20.04 LTS change hostname permanently

栏目: IT技术 · 发布时间: 6年前

内容简介：file. Open the Terminal application and type the following commands to set or change the hostname or computer name on Ubuntu.The procedure to change the computer name on Ubuntu 20.04 LTS:

I am a brand-new Ubuntu Linux 20.04 LTS VM user. By default, my server name to ‘localhost’ during cloud installation, but now I would like to change the computer name to ‘ubuntu-2004-nixcraft’. Can you tell me how do I remove the localhost and set it to ubuntu-2004-nixcraft on Ubuntu 20.04 Linux? How do I change the Ubuntu computer name from ‘localhost’ to ‘ubuntu-2004-nixcraft’? Can you tell me more about Ubuntu Linux change hostname command?

One can use the hostnamectl command to view or set the Ubuntu 20.04 LTS server’s host name. The host name or computer name is usually at system startup in /etc/hostname

file. Open the Terminal application and type the following commands to set or change the hostname or computer name on Ubuntu.

How to display the current Ubuntu hostname

Run the following command:

hostnamectl

Of course, you can use the echo command/printf command to print hostname too:

echo "$HOSTNAME"
printf "%s\n" $HOSTNAME
hostname

Ubuntu 20.04 LTS change hostname permanently

Finally, try thecat command on /etc/hostname

cat /etc/hostname

Ubuntu 20.04 LTS change hostname permanently

The procedure to change the computer name on Ubuntu 20.04 LTS:

Type the hostnamectl command :
sudo hostnamectl set-hostname newNameHere
Delete the old name and setup new name.
Next Edit the /etc/hosts file:
sudo nano /etc/hosts
Replace any occurrence of the existing computer name with your new hostname.
Reboot the system to changes take effect:
sudo reboot

How to change hostname on Ubuntu 20.04 without a system restart

Let us view current computer name setting, just type the following command:

hostnamectl

Next change hostname from localhost to ubuntu-2004-nixcraft, enter:

sudo hostnamectl set-hostname ubuntu-2004-nixcraft

Verify new changes:

hostnamectl
Ubuntu 20.04 LTS change hostname permanently

Find your public or private IP address by running theip command:

ip a

ip a s eth0

12: eth0@if13: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 00:16:3e:24:b3:08 brd ff:ff:ff:ff:ff:ff link-netnsid 0
    inet 10.105.28.43/24 brd 10.105.28.255 scope global eth0
       valid_lft forever preferred_lft forever
    inet6 fe80::216:3eff:fe24:b308/64 scope link 
       valid_lft forever preferred_lft forever

Update /etc/hosts file with that IP address such as 10.105.28.43 using a text editor such as vim command/nano command:

$ sudo vi /etc/hosts

$ sudo nano /etc/hosts

Update/append:

10.105.28.43 ubuntu-2004-nixcraft

Make sure you replace all occurrence of the old computer name with your new one too. Save and close the file in vim .

Conclusion

You learned how to change hostname permanently when using Ubuntu 20.04 LTS server or desktop computer as per your project needs.

This entry is 17 of 17 in the Linux/Unix Set hostname Tutorial series. Keep reading the rest of the series:

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