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How do you permanently change an Linux server's hostname on EC2 so that it doesn't get reset by package updates?

When I install Ubuntu 16 package updates on an EC2 server with:

sudo apt-get upgrade

I'll notice that often, after I reboot, my hostname will reset to something like:

ip-123-456-789-012

How do I prevent this? I manually set my custom hostname by doing:

sudo hostname myname
sudo bash -c "echo myname > /etc/hostname"
sudo bash -c "echo 127.0.0.1 myname >> /etc/hosts"

and this sticks across reboots, but not across updates.

1

Try using hostnamectl instead:

sudo hostnamectl set-hostname myname

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