[SOLVED] Privileged LXC with Arch fails to start network and systemd-nspawn


New Member
Dec 1, 2018
First off, I know that AppArmor is horribly broken right now. But if I understood that correctly this issue only affects unprivileged containers. Correct me if I'm wrong.

I created a privileged container with archlinux-base_20190124. Config:
arch: amd64
cores: 2
hostname: repo
memory: 2048
net0: name=eth0,bridge=vmbr0,gw=,hwaddr=E6:87:AE:D7:3B:99,ip=,type=veth
ostype: archlinux
rootfs: local-lvm:vm-103-disk-0,size=20G
swap: 512

Due to AppArmor (I think) I have to bring up the interface manually. But it least it works afterwards.
However, I want to use this container to host my own repository for Arch and build packages in a chroot. Arch uses systemd-nspawn for that purpose.
When running mkarchroot it builds the chroot, installs all the packages, but then fails with this error:

Failed to mount n/a (type n/a) on / (MS_REC|MS_SLAVE ""): Permission denied
Short read while reading cgroup mode (0 bytes). The child is most likely dead.

Trying to build a package in a chroot based on the newly created one fails with the same error.
Any ideas what I could do here? Other than just switching off AppArmor completely for this container?
In the Container Option Tab on our web GUI there's a Feature entry, which is only editable as root@pam at the time of writing, there you can enable nesting (translates to lxc.apparmor.allow_nesting=1).
pct set VMID -features 'nesting=1'
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Reactions: Chais
Hi Thomas,

that did it. Oddly enough it also seems to have helped getting the interface up and connected when the container starts. Perhaps due to systemd's extensive use of containerisation.


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