Hostnamectl

External

• http://man7.org/linux/man-pages/man1/hostnamectl.1.html
• http://man7.org/linux/man-pages/man8/systemd-hostnamed.8.html

Internal

• Linux
• Linux Hostname
• hostname command
• systemd-hostnamed

Change the Host Name

The preferred way to change a host name is with hostnamectl as follows:

hostnamectl set-hostname <name>

Example:

hostnamectl set-hostname docker-server.local

This commands changes all the hostnames (static, pretty and transient) of the system.

hostnamectl set-hostname and /etc/hosts

Note that changing the host name with hostnamectl set-hostname does not update /etc/hosts so you may want to review /etc/hosts and change the mapping of the host's network interface addresses to the new name.

Add or edit HOSTNAME in /etc/sysconfig/network:

NETWORKING=yes
GATEWAY=192.168.0.1
...
HOSTNAME=not500.localdomain

Update /etc/hosts as follows:

127.0.0.1   not500.localdomain not500 localhost localhost.localdomain ...
::1         not500.localdomain not500 localhost localhost.localdomain ...

Optionally you could resolve the name to the IP address of the primary network interface.

Run hostname to set the name for the current session. You may also want to run hostnamectl to update /etc/hostname.

If the Name is Publicly Resolved by DNS

TODO http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/set-hostname.html

Setting the Name

hostnamectl [--static|--pretty|--transient] set-hostname blah