Do:
vzctl set 101 --userpasswd root:password
where 101 is the container id
Notes from the manual:
–userpasswd user:password
Sets password for the given user in a container, creating the user if it does not exists. Note that this option is not saved in configuraâ€
tion file at all (so –save flag is useless), it is applied to the container (by modifying its /etc/passwd and /etc/shadow files).In case container root filesystem is not mounted, it is automatically mounted, then all the appropriate file changes are applied, then it is
unmounted.Note that container should be created before using this option.
Joel G Mathew, known in tech circles by the pseudonym Droidzone, is an opensource and programming enthusiast.
He is a full stack developer, whose favorite languages are currently Python and Vue.js. He is also fluent in Javascript, Flutter/Dart, Perl, PHP, SQL, C and bash shell scripting. He loves Linux, and can often be found tinkering with linux kernel code, and source code for GNU applications. He used to be an active developer on XDA forums, and his tinkered ROMS used to be very popular in the early 2000s.
His favorite pastime is grappling with GNU compilers, discovering newer Linux secrets, writing scripts, hacking roms, and programs (nothing illegal), reading, blogging. and testing out the latest gadgets.
When away from the tech world, Dr Joel G. Mathew is a practising ENT Surgeon, busy with surgeries and clinical practise.