dhclient hook not overwritten /etc/resolv.conf

[Ondřej Surý]

You need to ask on your distro user support forum and not here.  This topic is beyond
the subject of this list as it could include all kinds of integrations that your distribution
provides.

This is not a bind-users topic.

Ondrej
--
Ondřej Surý
ondrej at isc.org

> On 19 Dec 2019, at 11:41, Zhengyu Pan(联通集团联通云数据有限公司本部) <panzy16 at chinaunicom.cn> wrote:
> 
> I  only want to prepend only a IPv6 nameserver. Other ns are added by users.
> 
> Zhengyu
> Thanks.
> 
>> 2019年12月19日 下午6:32，Reindl Harald <h.reindl at thelounge.net> 写道：
>> 
>> 
>> 
>> Am 19.12.19 um 10:58 schrieb Zhengyu Pan:
>>> Sorry. I sent wrong mailing group.
>>> chattr not worked.  It prompted:
>>> Shutting down inteface eth0: chattr:Operation not permitted while setting flags on /etc/resolv.conf.
>> 
>> the opposite is true
>> 
>> it proves *that* it worked but waht can#t wrk i when you for whatever
>> reason need or believe to ned the dynamic nameservers
>> 
>> but that don't make sense anyways
>> 
>> having dozens of namservers in /etc/resolv.conf with your wished ones at
>> the bottom is useless because it won't be questioned at all as long the
>> first in teh list are responding
>> 
>>>> 2019年12月19日 下午5:28，Reindl Harald <h.reindl at thelounge.net> 写道：
>>>> Am 19.12.19 um 10:01 schrieb Zhengyu Pan:
>>>>> My OS is Centos7. I add a bash script dns.sh in
>>>>> /etc/dhcp/dhclient-exit-hooks.d . The script content is
>>>>> 
>>>>> #!/bin/bash
>>>>> echo“nameserver1.1.1.1”>>/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?
>>>> 
>>>> not a named qurstion at all, however
>>>> 
>>>> becasue something overwrote /etc/resolv.conf after your script which
>>>> maybe means your script runs way too early
>>>> 
>>>> chattr +i /etc/resove.conf under normal conditions
>>>> 
>>>> chattr -i /etc/resove.conf at the start of your script
>>>> chattr +i /etc/resove.conf at the end of your script
>>>> 
>>>> https://www.tecmint.com/chattr-command-examples/
>>>> 
>>>> this is a supported way to prevent resolv.conf overwritten by whatever
>>>> stuff running on the system, be it dhclient, networkmanager or another
>>>> smartass stuff which lives in a authistic world pretend to know what my
>>>> nameservers are
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