dhclient hook not overwritten /etc/resolv.conf

[Zhengyu Pan(联通集团联通云数据有限公司本部)]

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.

> 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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