HN# vzctl set 700 --userpasswd root:qwe
Starting VE ...
VE is mounted
VE start in progress...
Changing password for user root.
passwd: all authentication tokens updated successfully.
Stopping VE ...
VE was stopped
VE is unmounted
HN# vzctl enter 700
VE is not running
HN# vzctl start 700
Starting VE ...
VE is mounted
Setting CPU units: 1000
VE start in progress...
HN# vzctl enter 700
entered into VE 700
VE# su     
VE# exit
exit
VE# passwd root
Changing password for user root.
New UNIX password: 
Retype new UNIX password: 
passwd: all authentication tokens updated successfully.