How to set FQDN in Ubuntu

June 1, 2013 91.1k views
jr5689
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jr5689
Hi all, I want to set my FQDN in the format myhostname.mydomain.com I thought I only had to edit /etc/hosts: $ cat /etc/hosts 127.0.0.1 localhost apple # 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 $ I added just this line: 12.345.6.78 apple.example.com apple and then $ reboot and in Domains added an A record for apple.example.com but it does not seem to have any effect - I still get: $ hostname --fqdn localhost $ Any ideas please what I am doing wrong? Thanks...
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7 Answers
kamaln7 MOD June 3, 2013
Great! :]
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rahul.bansal April 18, 2014
Got it. Providing details for others.

I set hostname in web-interface as `do.rtcamp.com` for new droplet.

It added line in `/etc/hosts` file as:

127.0.0.1 localhost do.rtcamp.com do

I changed it to
127.0.0.1 localhost
188.226.169.135 do.rtcamp.com do

188.226.169.135 is IP of my new droplet.

Now hostname -f work as expected.
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kamaln7 MOD June 1, 2013
What do you have in /etc/hostname?
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jr5689 June 1, 2013
@ Kamal Nasser

$ cat /etc/hostname
apple
$

Thanks...
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kamaln7 MOD June 1, 2013
Edit /etc/hostname and put apple.example.com in it. Run hostname -F /etc/hostname and try hostname --fqdn again.
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jr5689 June 2, 2013
@ Kamal Nasser - ok it works now, thank you :)
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rahul.bansal April 18, 2014
@Kamal I am facing same issue but given solution is not working for me.

# cat /etc/hosts
127.0.0.1 localhost do.rtcamp.com do

# cat /etc/hostname
do.rtcamp.com

# hostname -F /etc/hostname

# hostname
do.rtcamp.com

#hostname --fqdn
localhost

I am on Ubuntu 12.04 :|
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