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I know that to update the hostname of an AWS EC2 instance, I have to update /etc/sysconfig/network and then do a reboot.

But I need to do it without the reboot, is there a way to do this? I know that in some Linux distributions, you just need to source certain files to do this, but I cannot find what needs to be sourced in case of Amazon Linux.

Also, the updated hostname should be persistent, as in it should stay after restarts.

Thanks.

Bhushan
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2 Answers2

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You can also edit /etc/hostname to have the desired hostname, and then run 

hostname -F /etc/hostname

to apply the hostname from that file to the system.

See hostname --help for more options.

zymhan
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    There's no `/etc/hostname` file in Amazon Linux AMI. You need to create it manually. But still, your command ran successfully. Upvoted as well – Hussain7 Jun 13 '18 at 08:25
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you can run hostname foo.bar.com then relogin and it'll be set to foo.bar.com

Mike
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