Hello,
Following are some important commands which are normally used while working on a Hardware Node.

1) vzlist -a : Shows list of all the VPS's hosted on the Node.
2) vzctl start VPS_ID: To start the VPS.
3) vzctl stop VPS_ID : To stop (Shut Down) the VPS
4) vzctl status VPS_ID : To view the status of the particular VPS
5) vzctl stop VPS_ID --fast : to stop the VPS quickly and forcefully
6) vzctl enter VPS_ID : To enter in a particular VPS

Configuration Commands

1) vzctl set VPS_ID --hostname vps.domain.com --save: To set the Hostname of a VPS.
2) vzctl set VPS_ID --ipadd 1.2.3.4 --save : To add a new IP to the VPS.
3) vzctl set VPS_ID --ipdel 1.2.3.4 --save : To delete the IP from VPS.
4) vzctl set VPS_ID --userpasswd root:new_password --save : to reset root password of a VPS.
5) vzctl set VPS_ID --nameserver 1.2.3.4 --save : To add the nameserver IP's to the VPS.
6) vzctl exec VPS_ID command : To run any command on a VPS from Node.
6) vzyum VPS_ID install package_name : To install any package/Software on a VPS from Node.

Here VPS_ID refers to the ID of the Particular VPS.

Best Regards,
Milind M. Koyande.