Re: How to make dhclient reread its config? (Debian 10)
Hi.
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.
> "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.
Reco
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