... > I still wonder why it also works if hostname is only set in /etc/hosts like: > > 127.0.0.1 localhost > 10.0.0.50 myserver.domain.example myserver > > and $HOSTNAME is undefined. Ah, got it: /etc/sysconfig/network-scripts/ifup-post ... if need_hostname; then IPADDR=`LANG= LC_ALL= ifconfig ${DEVICE} | grep 'inet addr' | awk -F: '{ print $2 } ' | awk '{ print $1 }'` eval `/bin/ipcalc --silent --hostname ${IPADDR}` if [ "$?" = "0" ]; the set_hostname $HOSTNAME fi fi ... So the conclusion seems to be: If you have a local interface only you should just set: 127.0.0.1 localhost ::1 localhost6 in /etc/hosts and HOSTNAME=localhost in /etc/sysconfig/network This means it is not suggested to have a hostname other than localhost on a loopback only box. If you have an network interface configured /etc/hosts may look like: 127.0.0.1 localhost ::1 localhost6 10.0.0.50 host.domain.example host and HOSTNAME=host.domain.example in /etc/sysconfig/network Best Regards Marcus _______________________________________________ CentOS mailing list CentOS@xxxxxxxxxx http://lists.centos.org/mailman/listinfo/centos