Mauricio Tavares wrote:
On Wed, Jul 23, 2014 at 2:01 PM, m.roth@5-cent.us wrote:
I've a 7 box (actually, it's RHEL, but the general list there is moribund), and I'm trying to configure it "correctly" so that it gets its hostname from the DHCP server. All I've found so far is a script to use from hooks of some kind. *Surely* there's just a configuration file option somewhere....
Best I found using network manager is writing a script,dhclient-exit-hooks.d/hostname (http://askubuntu.com/questions/104918/how-to-get-hostname-from-dhcp-server). There is also a way to do that using systemd-networkd; I am not very proud to say I know how to do so though.
I've been digging, and found something a) confusing and b) disturbing. But first, *does* NM use any of the /etc/sysconfig/network-scripts *other* than the ifcfg-<interface>? Specifically, does it use ifup, ifdown, and esp. ifup-post?
Here's the reason: in ifup-post is the following code: # don't set hostname on ppp/slip connections if [ "$2" = "boot" -a \ "${DEVICE}" != lo -a \ "${DEVICETYPE}" != "ppp" -a \ "${DEVICETYPE}" != "slip" ]; then if need_hostname; then IPADDR=$(LANG=C ip -o -4 addr ls dev ${DEVICE} | awk '{ print $4 ; exit }') eval $(/bin/ipcalc --silent --hostname ${IPADDR} ; echo "status=$?") if [ "$status" = "0" ]; then set_hostname $HOSTNAME fi fi fi
Now, that function, need_hostname, is in network-functions, and reads: need_hostname () { CHECK_HOSTNAME=$(hostname) if [ "$CHECK_HOSTNAME" = "(none)" -o "$CHECK_HOSTNAME" = "localhost" -o \ "$CHECK_HOSTNAME" = "localhost.localdomain" ]; then return 0 else return 1 fi }
So it *should* be setting it... if it's called.
mark