how to change FQDN in ubuntu

linux networking ubuntu dns

9,530

Edit /etc/hostname and put ubuntu

echo "ubuntu" > /etc/hostname

Put hostname entry as well in following format in /etc/hosts

IP  fqdn   hostname

Your /etc/hosts should look like

  127.0.0.1   localhost
  127.0.1.1   ubuntu.example.com  ubuntu
  192.168.217.129 ubuntu.example.com  ubuntu 
# The following lines are desirable for IPv6 capable hosts

9,530

THARAKA SANDARUWAN

Updated on September 18, 2022

Comments

THARAKA SANDARUWAN over 1 year
I tried to change the FQDN in Ubuntu using sudo -i gedit /etc/hosts and change as shown below:
```
127.0.0.1   localhost
127.0.1.1   ubuntu.example.com
192.168.217.129 ubuntu.example.com

# The following lines are desirable for IPv6 capable hosts
::1     ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
```
after that I tried:
```
hostname -f 
```
which shows:
```
hostname: Name or service not known
```
How can I change the FQDN?
- Hussain7 over 8 years
  
  The below link will help you. askubuntu.com/questions/158957/…
- Kinnectus over 8 years
  
  Try the most popular answer here: askubuntu.com/questions/158957/…
- Kinnectus over 8 years
  
  Well what'ya know!
- Thufir over 7 years
  
  rather than using sudo with gedit, might I suggest nano? It's quite easy. Occasionaly, vi is the only real option -- but I think that's realistically only for visudo. I wouldn't mix gedit and sudo, myself.