Setting hostname in CentOS 7 and RHEL7

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Setting the hostname in CentOS 6 used to done with:

$ hostname foobar.example.com

This would only set the hostname until server restart though. To get the hostname to stick, the file: /etc/sysconfig/network would need to be edited. The line HOSTNAME= needs to be updated from (localhost.localdomain is the default value):

HOSTNAME=localhost.localdomain

to:

HOSTNAME=foobar.example.com

In CentOS 7 everything is done with the command line command hostnamectl.

For a temporary setting of the hostname

hostnamectl set-hostname foobar.example.com

And to make it stick, use the flag --static:

hostnamectl set-hostname --static foobar.example.com

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