http://serverfault.com – On CentOS (5.x) I have a VPS that has hostname set to "olddomain.com", at least this is the domain I am getting when typing "hostname" command. I want to change it to 'localhost.localdomain' because I think it is more generic and reliable. localhost.localdomain already exists in these files: /etc/sysconfig/network AND /etc/hosts NETWORKING=yes NETWORKING_IPV6=no HOSTNAME=localhost.localdomain GATEWAY=95.xx.xx.xx AND # Do not remove the following line, or various programs # that require network functionality will fail. 127.0.0.1 localhost.localdomain localhost ::1 (HowTos)