Hi. On Wed, Feb 24, 2016 at 08:54:50PM +1300, Richard Hector wrote: > Anyone know if/how I can restart dhclient without stopping the network? > > It's the only process left holding open the old libc after the > upgrade, and I'd rather avoid restarting the network (or rebooting), > since I'm working remotely. > > This is on a wheezy box. It shouldn't be using dhcp, really, but > that's an issue for another day ...
Short version (assuming that you're using stock isc-dhcp-client and your network interface is called eth0): pkill -9 -f dhclient ifup --force eth0 Long version: Sending a SIGKILL to dhclient will force it to terminate, but won't leave it time to deconfigure a network interface. Hence your network interface configuration should be leaved as is. Forcing a network interface into UP state with ifupdown(1) will launch a fresh version of dhclient, which should try to reuse existing lease file at /var/lib/dhcp/dhclient.eth0.leases. And by reusing said lease file dhclient should ask DHCP server for the same client IP. Of course, if you're trying to do it over a network connection, it would be a good idea to do the whole sequence in a screen(1) (or tmux), and to add a timed reboot just in case. I.e: pkill -9 -f dhclient ifup --force eth0 sleep 1800 reboot If all goes well you would be able to re-attach to a existing screen session, and cancel the reboot. If anything goes wrong - you'll have your host alive and kicking after 30 minutes of waiting. Reco
