[lxc-users] [Unable to start using lvm backend]

[Xavier Gendre]

Hello Fajar,

>> It may be useful to give more details about what i am trying to do ;-) I
>> work with a Debian Jessie and LXC 1.0.6 from the Debian repository.
>
> You should realy use at least 1.0.7 from experimental, or better yet, 1.1.1.

That was a good advice... with 1.0.7 from experimental, everything works 
like a charm. I can create root owned unprivileged containers with lvm 
backend and start them without any tweak (no chmod, ...).

Thank you for spending some time on my problem and giving me hope with a 
working example ;-)

Xavier

>
>> Finally, i try to start this container but it miserably fails,
>>
>> root # lxc-start -n test --logfile test.log --logpriority DEBUG
>> lxc-start: failed to determine fs type for '/dev/Pool/test'
>> lxc-start: failed to determine fs type for '/dev/dm-7'
>> lxc-start: failed to mount rootfs
>
>
> Works for me, just needed a chmod (which is shown on the helpful error
> message that I get). This is lxc 1.1.1+master~20150407-0 from ubuntu
> daily ppa.
>
> # cat /etc/subuid
> lxc-dnsmasq:100000:10000
> user:100000:65537
> root:1000000:100000
>
> # cat /etc/subgid
> lxc-dnsmasq:100000:10000
> user:100000:65537
> root:1000000:100000
>
> # cat << END > /tmp/test.conf
>> lxc.id_map = u 0 1000000 100000
>> lxc.id_map = g 0 1000000 100000
>> lxc.network.type = empty
>> END
>
> # lxc-create -n test -f /tmp/test.conf -t download -B lvm --vgname lxc
> -- -d ubuntu -r utopic -a amd64
> File descriptor 3 (/var/lib/lxc/test/partial) leaked on lvcreate
> invocation. Parent PID 24304: lxc-create
>    Logical volume "test" created
> Using image from local cache
> Unpacking the rootfs
>
> ---
> You just created an Ubuntu container (release=utopic, arch=amd64,
> variant=default)
>
> To enable sshd, run: apt-get install openssh-server
>
> For security reason, container images ship without user accounts
> and without a root password.
>
> Use lxc-attach or chroot directly into the rootfs to set a root password
> or create user accounts.
>
> # lxc-start -n test
> lxc-start: lxc_start.c: main: 344 The container failed to start.
> lxc-start: lxc_start.c: main: 346 To get more details, run the
> container in foreground mode.
> lxc-start: lxc_start.c: main: 348 Additional information can be
> obtained by setting the --logfile and --logpriority options.
>
> # lxc-start -F -n test
> lxc-start: start.c: print_top_failing_dir: 102 Permission denied -
> could not access /var/lib/lxc.  Please grant it 'x' access, or add an
> ACL for the container root.
> lxc-start: sync.c: __sync_wait: 51 invalid sequence number 1. expected 2
> lxc-start: start.c: __lxc_start: 1157 failed to spawn 'test'
> lxc-start: lxc_start.c: main: 344 The container failed to start.
> lxc-start: lxc_start.c: main: 348 Additional information can be
> obtained by setting the --logfile and --logpriority options.
>
> # chmod o+x /var/lib/lxc
>
> # lxc-start -n test
>
> # lxc-ls -f --running
> NAME  STATE    IPV4  IPV6  GROUPS  AUTOSTART
> --------------------------------------------
> test  RUNNING  -     -     -       NO
>
> # lxc-attach -n test -- cat /proc/1/uid_map
>           0    1000000     100000
>