LXC containers wont start

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1

I am at my wit’s end and do not know why my LXC containers do not want to start. I run it using sudo but this gives the same error.
Do any of you have the same error and could fix it?

Name: mydebianlxc
Status: STOPPED
Type: container
Architecture: x86_64
Created: 2022/08/15 10:55 CEST
Last Used: 2022/08/15 11:07 CEST

Log:

lxc mydebianlxc 20220815090734.607 ERROR    conf - ../src/lxc/conf.c:lxc_map_ids:3672 - newuidmap failed to write mapping "": newuidmap 255943 0 1000000 1000000000
lxc mydebianlxc 20220815090734.607 ERROR    start - ../src/lxc/start.c:lxc_spawn:1788 - Failed to set up id mapping.
lxc mydebianlxc 20220815090734.607 ERROR    lxccontainer - ../src/lxc/lxccontainer.c:wait_on_daemonized_start:877 - Received container state "ABORTING" instead of "RUNNING"
lxc mydebianlxc 20220815090734.608 ERROR    start - ../src/lxc/start.c:__lxc_start:2107 - Failed to spawn container "mydebianlxc"
lxc mydebianlxc 20220815090734.609 WARN     start - ../src/lxc/start.c:lxc_abort:1036 - Kein passender Prozess gefunden - Failed to send SIGKILL via pidfd 17 for process 255943
lxc 20220815090739.640 ERROR    af_unix - ../src/lxc/af_unix.c:lxc_abstract_unix_recv_fds_iov:218 - Die Verbindung wurde vom Kommunikationspartner zurückgesetzt - Failed to receive response
lxc 20220815090739.640 ERROR    commands - ../src/lxc/commands.c:lxc_cmd_rsp_recv_fds:128 - Failed to receive file descriptors for command "get_state"
2

Is it the first time you tried to start LXC containers or did it work before on this system? Did you checked the Arch Wiki on how to set up LXC and did you see the note on how to run unprivileged containers? What command did you used to start the container?

https://wiki.archlinux.org/title/Linux_Containers

3

Some wird stuf going on my machine - I tried the first command on your linked article and this give me this:

ps -ef | head -n 5

UID          PID    PPID  C STIME TTY          TIME CMD
root           1       0  0 08:59 ?        00:00:05 /sbin/init
root           2       0  0 08:59 ?        00:00:00 [kthreadd]
root           3       2  0 08:59 ?        00:00:00 [rcu_gp]
root           4       2  0 08:59 ?        00:00:00 [rcu_par_gp]

I’m a absolute container and network noob but I think this is for many confusing. I don’t know but I think my systemd don’t work proper.

4

The first section describes the difference between unprivileged containers and privileged containers. The commands and output are just to illustrate it. You don’t need to run theses, specially since the first command is run inside a container.

If you are a container noob, are you sure LXC is the correct choice? LXC can be easily used on Ubuntu, since it is developed by Canonical(the company behind Ubuntu). On other distributions, it might require some (a lot) work.

If you want to use LXC start with the setup section. Do not blindly copy, paste and run commands. Read it carefully. If you don’t want to run unprivileged containers you can skip a lot.
If you use AppArmor, you might need to configure it. I don’t use it, so I don’t know if it needs to be configured. Since it is not a Arch Linux default there is no information on LXC and AppArmor in the Arch Wiki. You would need to research this on your own.

You might also want to check out LXD, which is build on top of LXC. This makes a lot of things easier.
https://wiki.archlinux.org/title/LXD

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