Hello,
If you receive this message when you try to stop/start the container:
[root@server ~]# vzctl start 302
Container already locked
To fix the issue delete the lock file of the container.
[root@server ~]# rm /vz/lock/302.lck
rm: remove regular file `/vz/lock/302.lck'? y
After that start the container:
[root@server ~]# vzctl start 302
Starting container...
Container is mounted
Container start in progress...
That's it