[lxc-users] Trying to create a lxc container for running Visual Studio Code

[Peter Carlsson]

On Thu, Feb 11, 2021 at 11:54:05AM -0600, Serge E. Hallyn wrote:
> On Wed, Feb 10, 2021 at 10:49:55PM +0100, Peter Carlsson wrote:
> > On Wed, Feb 10, 2021 at 07:08:09AM -0600, Serge E. Hallyn wrote:
> > 
> > Hello again!
> > 
> > Thanks for your help.
> > 
> > I decided to start fresh and create the container as unprivileged. I
> > therefor deleted the old thread.
> > 
> > Here is basically what I did:
> > 
> > As root:
> > 
> >   usermod -v 100000-200000 -w 100000-200000 peter
> >   cat /etc/subuid
> >     peter:100000:100001
> >   cat /etc/subgid
> >     peter:100000:100001
> > 
> >   nano /etc/sysctl.conf
> >     # Added by Peter Carlsson 2021-02-10 for lxc
> >     kernel.unprivileged_userns_clone=1
> > 
> >   nano /etc/default/lxc-net
> >     #USE_LXC_BRIDGE="true"
> > 
> >   nano /etc/lxc/default.conf
> >     lxc.net.0.type = veth
> >     lxc.net.0.link = lxcbr0
> >     lxc.net.0.flags = up
> > 
> >     lxc.apparmor.profile = generated
> >     lxc.apparmor.allow_nesting = 1
> > 
> > As user peter:
> > 
> >   mkdir /home/peter/.config/lxc
> >   nano /home/peter/.config/lxc/default.conf
> >     lxc.net.0.type = veth
> >     lxc.net.0.link = lxcbr0
> >     lxc.net.0.flags = up
> > 
> >     lxc.apparmor.profile = generated
> >     lxc.apparmor.allow_nesting = 1
> > 
> >     lxc.idmap = u 0 100000 100001
> >     lxc.idmap = g 0 100000 100001
> 
> This all looks good.
> 
> > Don't know if this was necessary but I ran this after reading a link found on Google
> > 
> >   lxc-usernsexec
> 
> Sorry I'm not following here.  lxc-usernsexec without any arguments
> will put you in a shell in a user namespace.  I assume you exited that
> before going on with lxc-create, right?

Never mind. To try to solve my problems I googled and tried out
different advices but this was something I don't think I did anything
successful with.

> >   lxc-create -t download -n VisualStudioCode -- -d debian -r buster -a amd64
> > 
> >   lxc-start -n VisualStudioCode -F
> >  
> >     lxc-start: VisualStudioCode: network.c: lxc_create_network_unpriv_exec: 2178 lxc-user-nic failed to configure requested network: No such file or directory - Failed to open "/etc/lxc/lxc-usernet"
> >     cmd/lxc_user_nic.c: 1296: main: Quota reached
> >     lxc-start: VisualStudioCode: start.c: lxc_spawn: 1777 Failed to create the configured network
> >     lxc-start: VisualStudioCode: start.c: __lxc_start: 1951 Failed to spawn container "VisualStudioCode"
> >     lxc-start: VisualStudioCode: tools/lxc_start.c: main: 330 The container failed to start
> >     lxc-start: VisualStudioCode: tools/lxc_start.c: main: 336 Additional information can be obtained by setting the --logfile and --logpriority options
> > 
> > What should I put in /etc/lxc/lxc-usernet?
> 
> cat << EOF | sudo tee /etc/lxc/lxc-usernet
> # USERNAME TYPE BRIDGE COUNT
> peter veth lxcbr0 10
> 
> > Do you see something else I have missed or should have done differently?
> 
> Not offhand.  But do make sure that lxc-net is running, i.e. make sure
> that 'brctl show' shows lxcbr0
> 
> > Note that I had the network working for the container created by root.
 
Now I have also done these things and had some progress:

  systemctl enable lxc-net
  systemctl start lxc-net

  nano /etc/lxc/lxc-usernet
    # USERNAME TYPE BRIDGE COUNT
    peter veth lxcbr0 10

  chmod 755 /home/peter/.local/share/
  chmod 755 /home/peter/.local/share/lxc/

  lxc-start -n VisualStudioCode -F
    Failed to mount cgroup at /sys/fs/cgroup/systemd: Permission denied
    [!!!!!!] Failed to mount API filesystems.
    Exiting PID 1...

For me it is not obvious what my next step should be. Any help would be
appreciated.

Best regards,
Peter Carlsson