Is AWS EC2 change hostname Ubuntu giving you trouble? Our Support Engineers are here with an easy solution.

At Bobcares, we come across several similar queries each day as a part of our AWS Support Services.

Our Support Team is dedicated to finding a solution to each query every single time.

All about AWS EC2 change hostname Ubuntu

You have the option of changing the hostname of your Amazon EC2 instance. However, sometimes you may notice that the hostname changes back after a reboot and restarting the instance. Our Support Engineers have come up with a solution to resolve this issue.

How to resolve AWS EC2 change hostname in Ubuntu

1. First, open /etc/hosts file via vim.

   sudo vim /etc/hosts

2. Then, update the /etc/hosts file and include the persistent hostname for localhost as seen below:

   127.0.0.1 localhost persistant-hostname

   Sometimes, you may have to create an entry for local host in case it is not present in the /etc/hosts file on the EC2 instance.
3. Next, add the following configuration data in case the EC2 instance uses IPV6:

   ::1 ip6-localhost ip6-loopback 
   fe00::0 ip6-localnet 
   ff00::0 ip6-mcastprefix 
   ff02::1 ip6-allnodes 
   ff02::2 ip6-allrouters 
   ff02::3 ip6-allhosts

4. After that, save the changes and exit the vim editor.
5. Next, run the hostnamectl command with the new hostname.

   sudo hostnamectl set-hostname persistent-hostname

6. Then, reboot or start the EC2 instance and run the hostname command without any parameters. This will verify whether we have been successful in ensuring the hostname change persisted.

After this procedure is completed successfully, the hostname command will return the new hostname you had specified in step 2.

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Conclusion

At the end of the day, we learned from our Skilled Engineers how to ensure that the new hostname remains consistent even after you reboot or restart the instance.