Reco wrote: > > On Wed, Aug 26, 2020 at 10:56:30AM +0700, Victor Sudakov wrote: > > There seems to be no dhclient service in systemd, and I don't find > > any info about signalling dhclient with "kill -HUP" etc. > > There is no need for "dhclient" service in systemd, as there's > "networking" service for that. Restarting the latter is probably a bad > idea in your case.
Not that bad, and actually thank you for this idea. I've just tried `systemctl restart networking` on a host I have emergency console access to, and it went well: the host became inaccessible for 4-5 seconds and then got back online, and even TCP connections (including my ssh session) were not dropped. > > > > "dhclient -x" or "dhclient -r" bring the network down (I've actually > > confirmed that on a test host), and I loathe to risk it on a remote box. > > As they should. Both "-x" and "-r" run dhclient scripts before dhclient > exists, and this involves deconfiguring an appropriate network > interface. > > > > A reboot seems too radical. > > > > Any ideas please? > > Try this (note to the certain list readers - it's dangerous, do not try > it at home unless you have a console access): > > # ip -o a l dev eth0 > 2: eth0 inet 10.0.2.15/24 brd 10.0.2.255 scope global dynamic eth0... > ... > # pgrep -fa dhc > 355 /sbin/dhclient -4 -v -i -pf /run/dhclient.eth0.pid ... > # pkill -9 -f dhclient > # ip -o a l dev eth0 # note that the IPs stay > 2: eth0 inet 10.0.2.15/24 brd 10.0.2.255 scope global dynamic eth0... > ... > # ifup --force eth0 > Internet Systems Consortium DHCP Client 4.4.1 ... > > Basically, by sending SIGKILL to dhclient you leave your current > interface configuration as is, and by running dhclient again (via ifup > in this case) you apply your dhclient.conf changes. Thanks, Reco, if ever `systemctl restart networking` fails me, I'll do this manual thing. -- Victor Sudakov, VAS4-RIPE, VAS47-RIPN 2:5005/49@fidonet http://vas.tomsk.ru/
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