dhclient hook not overwritten /etc/resolv.conf

Philippe Maechler pmaechler-ml at glattnet.ch
Thu Dec 19 10:16:08 UTC 2019

Hi Zhengyu Pan


Have you tried to put this nameserver address in dhclient.conf? 


>From man dhclient.conf

     append { [option declaration] [, ... option declaration] }

             If for some set of options the client should first use the values

             supplied by the server, if any, and then use values you supply,

             these values can be defined in the append statement.  The append

             statement can only be used for options which allow more than one

             value to be given.  This restriction is not enforced - if you

             ignore it, the behaviour will be unpredictable.


I haven’t use the ap- or prepend options, but the supersede option work like a charm (at least on FreeBSD)





From: bind-users <bind-users-bounces at lists.isc.org> On Behalf Of Zhengyu Pan(???????????????)
Sent: Thursday, December 19, 2019 10:01 AM
To: bind-users at lists.isc.org
Subject: dhclient hook not overwritten /etc/resolv.conf



My OS is Centos7. I add a bash script dns.sh in /etc/dhcp/dhclient-exit-hooks.d . The script content is


echo “nameserver” >> /etc/resolv.conf 

I want to append a nameserver in /etc/resove.conf.

However, when I restart network. /etc/resove.conf not changed.

/etc/resove.conf.save append this line. 

Why happens that? How can I append a nameserver in /etc/resove.conf?


Best Wishes

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