No network in chroot environment

[Ralf Mardorf]

On Sat, 25 Jan 2020 21:54:03 +0100, Ralf Mardorf wrote:
>On Sat, 25 Jan 2020 21:43:53 +0100, Ralf Mardorf wrote:
>>To workaround issues when using systemd-nspawn without the -b option
>>my resolv.conf files are files and not links. IIRC a link does work,
>>when using systemd-nspawn with the -b option. However, while a chroot
>>allows to do some things, that still can't be done by using
>>systemd-nspawn, with or without the -b flag, a chroot might suffer
>>from one or another pitfall (perhaps related to systemd). Perhaps
>>resolv.conf is such a pitfall.
>>
>>There's no issue at all by using a resolv.conf file instead of a link
>>for my Ubuntu 16.04 and Arch Linux installs, at least not when using
>>systemd-nspawn.
>>
>>Sometimes systemd-nspawn can't replace a chroot. However, I didn't
>>remember any issue by using resolv.conf files instead of links, when
>>using a chroot, but maybe resolv.conf wasn't needed at all, when I
>>needed to use a chroot instead of systemd-nspawn.
>>
>>Consider to dally over with the principle of trial and error. IOW for
>>testing purpose replace the links by a file.  
>
>PS:
>
>And the files instead of links are no issue at all, too, when using my
>Ubuntu or Arch install by just booting it from bare metal, instead of
>chrooting or systemd-nspawning it ;).
>
>[rocketmouse at archlinux ~]$ llmount -w moonstudio
>[sudo] password for rocketmouse: 
>[rocketmouse at archlinux ~]$ su
>Password: 
>[root at archlinux rocketmouse]# cd /mnt/moonstudio/
>[root at archlinux moonstudio]# lsb_release -a
>LSB Version:	1.4
>Distributor ID:	Arch
>Description:	Arch Linux
>Release:	rolling
>Codename:	n/a
>[root at archlinux moonstudio]# ls -l /etc/resolv.conf
>-rw-r--r-- 1 root root 94 Jan 22 04:32 /etc/resolv.conf
>[root at archlinux moonstudio]# systemd-nspawn lsb_release -a
>Spawning container moonstudio on /mnt/moonstudio.
>Press ^] three times within 1s to kill container.
>LSB Version:
>core-9.20160110ubuntu0.2-amd64:core-9.20160110ubuntu0.2-noarch:security-9.20160110ubuntu0.2-amd64:security-9.20160110ubuntu0.2-noarch
>Distributor ID:	Ubuntu Description:	Ubuntu 16.04.6 LTS
>Release:	16.04
>Codename:	xenial
>Container moonstudio exited successfully.
>[root at archlinux moonstudio]# systemd-nspawn ls -l /etc/resolv.conf
>Spawning container moonstudio on /mnt/moonstudio.
>Press ^] three times within 1s to kill container.
>-rw-r--r-- 1 root root 94 Jan 22 04:32 /etc/resolv.conf
>Container moonstudio exited successfully.
>[root at archlinux moonstudio]# ls -l /mnt/moonstudio/etc/resolv.conf
>-rw-r--r-- 1 root root 94 Jan 22 04:32 /mnt/moonstudio/etc/resolv.conf
>[root at archlinux moonstudio]#

Oops, I copied and pasted more than I intended to do. Don't worry about
'llmount' it's just a bash alias to mount by label and was pasted by
accident.