resolv.conf questions

[Mike Marchywka]

On Tue, Aug 06, 2019 at 04:15:01PM +0200, Ralf Mardorf via ubuntu-users wrote:
> On Tue, 6 Aug 2019 13:22:19 +0000, Mike Marchywka wrote:
> >I think there are comment somewhere that you can replcae that( IIRC 
> >a symbolic link, [snip] with an actual file
> 
> IIRC I needed to do this, to use systemd-nspawn without the '--boot'
> option [1], but apart from such an unusual case the link against run/
> shouldn't matter and the content of the file likely gets automatically
> overwritten [2], if it's a link to a file or a file.
> 
> [1]
> [rocketmouse at archlinux ~]$ head -2 /mnt/moonstudio/etc/os-release
> NAME="Ubuntu"
> VERSION="16.04.6 LTS (Xenial Xerus)"
> [rocketmouse at archlinux ~]$ ls -l /mnt/moonstudio/etc/resolv.conf
> -rw-r--r-- 1 root root 94 Aug  5 23:08 /mnt/moonstudio/etc/resolv.conf
> [rocketmouse at archlinux ~]$ cat /mnt/moonstudio/etc/resolv.conf
> # Generated by resolvconf
> domain localdomain
> nameserver 192.168.1.1
> nameserver fe80::1%enp3s0
> [rocketmouse at archlinux ~]$ head -2 /etc/os-release
> NAME="Arch Linux"
> PRETTY_NAME="Arch Linux"
> [rocketmouse at archlinux ~]$ ls -l /etc/resolv.conf
> -rw-r--r-- 1 root root 94 Aug  5 23:08 /etc/resolv.conf
> [rocketmouse at archlinux ~]$ cat /etc/resolv.conf
> # Generated by resolvconf
> domain localdomain
> nameserver 192.168.1.1
> nameserver fe80::1%enp3s0
> 
> [2]
> "Normally  the  resolvconf  program is run only by network interface
> configuration programs such as ifup(8),  ifdown,  NetworkManager(8),
> dhclient(8),  and  pppd(8);  and  by  local nameservers  such  as
> dnsmasq(8).  These programs obtain nameserver information from some
> source and push it to resolvconf."
> - http://manpages.ubuntu.com/manpages/xenial/man8/resolvconf.8.html
> 
> Let alone that Colin already posted
> "# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
>  #     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN"
> 
> So even if it's not in run/, a tmpfs that gets deleted at shutdown, the
> content will be overwritten.

It sounds liks this changed alot from 16 to 18 and can't remember which I saw
where :) Your illustration also appears to include IPV6. Given how fast
this stuff is changing it may be worthwhile to consult reference works
or release notes or something if you have to dig into it.

> 
> 
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mike marchywka
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