I'm trying to setup OpenVPN in an unprivileged container. The host and
container are both Debian Jessie on LXC version 1.1.5. When I try to start
OpenVPN I get:
Sat May 28 20:55:57 2016 us=360137 ERROR: Cannot open TUN/TAP dev /dev/net/tun:
No such file or directory (errno=2)
So it makes sense that the container can't create the tun device so I looked
around and found suggestions to add an autodev hook:
lxc.cgroup.devices.deny = a
lxc.cgroup.devices.allow = c 10:200 rwm
lxc.hook.autodev = sh -c "modprobe tun; cd ${LXC_ROOTFS_MOUNT}/dev; mkdir net; mknod
net/tun c 10 200; chmod 0666 net/tun"
However when I try to start the container I get an error:
lxc-start -n vpn_barracks --logpriority=DEBUG
...
lxc-start 1464541270.246 INFO lxc_conf -
conf.c:mount_file_entries:2150 - mount points have been setup
lxc-start 1464541270.247 INFO lxc_conf - conf.c:run_script_argv:362 -
Executing script '/usr/share/lxcfs/lxc.mount.hook' for container
'vpn_barracks', config section 'lxc'
lxc-start 1464541270.332 INFO lxc_conf - conf.c:run_script_argv:362 - Executing
script 'sh -c "modprobe tun; cd ${LXC_ROOTFS_MOUNT}/dev; mkdir net; mknod net/tun c
10 200; chmod 0666 net/tun"' for container 'vpn_barracks', config section 'lxc'
lxc-start 1464541270.338 ERROR lxc_conf - conf.c:run_buffer:342 -
Script exited with status 1
lxc-start 1464541270.338 ERROR lxc_conf - conf.c:lxc_setup:3947 -
failed to run autodev hooks for container 'vpn_barracks'.
lxc-start 1464541270.338 ERROR lxc_start - start.c:do_start:717 -
failed to setup the container
lxc-start 1464541270.338 ERROR lxc_sync - sync.c:__sync_wait:51 -
invalid sequence number 1. expected 2
lxc-start 1464541270.374 ERROR lxc_start - start.c:__lxc_start:1192 -
failed to spawn 'vpn_barracks'
lxc-start 1464541270.430 WARN lxc_commands -
commands.c:lxc_cmd_rsp_recv:172 - command get_init_pid failed to receive
response
lxc-start 1464541270.431 WARN lxc_cgmanager - cgmanager.c:cgm_get:994
- do_cgm_get exited with error
lxc-start 1464541275.436 ERROR lxc_start_ui - lxc_start.c:main:344 -
The container failed to start.
lxc-start 1464541275.436 ERROR lxc_start_ui - lxc_start.c:main:346 -
To get more details, run the container in foreground mode.
lxc-start 1464541275.436 ERROR lxc_start_ui - lxc_start.c:main:348 -
Additional information can be obtained by setting the --logfile and
--logpriority options.
I'd appreciate any pointers.
Thanks,
Joshua
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