Common Used OpenVZ Commands:

Hello Everyone,

This article covers most commonly used OpenVZ commands that can be useful for system administrator who are using OpenVZ:

1. To list running VPSs on the node:
[Command ]# vzlist

[B]Example:[/B]
# vzlist
      CTID      NPROC STATUS    IP_ADDR         HOSTNAME
       101        112 running   xx.xx.xx.xx  server1.24x7.com    
       102         54 running   xx.xx.xx.xx  server2.24x7.com

2. To list all running as well as stopped VPSs on the node:
[Command ]# vzlist -a

[B]Example:[/B]
# vzlist -a
        CTID      NPROC STATUS    IP_ADDR         HOSTNAME
      CTID      NPROC STATUS    IP_ADDR         HOSTNAME
       101        112 running   xx.xx.xx.xx  server1.24x7.com    
       102         54 running   xx.xx.xx.xx  server2.24x7.com    
       103          - stopped   xx.xx.xx.xx  server3.24x7.com

3. To start a VPS
[Command ]# vzctl start CTID

[B]Example:[/B]
# vzctl start 110

4. To stop or shutdown a VPS
[Command ]# vzctl stop CTID

[B]Example:[/B]
# vzctl stop 110

5. To view the status of a VPS
[Command ]# vzctl status CTID

[B]Example:[/B]
# vzctl status 110
CTID 116 exist unmounted down

6. To restart a VPS
[Command ]# vzctl restart CTID

[B]Example:[/B]
# vzctl restart 110
Logging into a container

7. To enter a VPS
[Command ]# vzctl enter CTID

[B]Example:[/B]
# vzctl enter 106
entered into CT 106
Suspend and delete a container

8. To delete a container:
[Command ]# vzctl destroy CTID

9. To suspending a container:
[Command ]# vzctl suspend CTID

10. To set hostname for a Server:
[Command ]# vzctl set CTID --hostname New_hostname --save

11. To add new IP to VPS:
[Command ]# vzctl set CTID --ipadd xx.xx.xx.xx --save

12. To delete IP from the VPS
[Command ]# vzctl set CTID --ipdel xx.xx.xx.xx --save

13. To reset root password of the VPS:
[Command ]# vzctl set CTID --userpasswd root:new_password --save

14. To add nameserver IP to VPS:
[Command ]# vzctl set CTID --nameserver xx.xx.xx.xx --save

15. To executes command inside container from the node:
[Command ]# vzctl exec CTID command

[B]Example:[/B]
# vzctl exec 101 df -h
Filesystem Size Used Avail Use% Mounted on
/dev/simfs 130G 89G 27G 78% /
none 8.0G 4.0K 8.0G 1% /dev
none 8.0G 0 8.0G 0% /dev/shm

16. To check the VPS resource usages:
[Command ]# vzcalc -v CTID

[B]Example:[/B]
# vzcalc -v 101
Resource     Current(%)  Promised(%)  Max(%)
Low Mem          1.32 343754532205.77 343754532205.77
Total RAM       16.50        n/a        n/a
Mem + Swap       5.61 75011961258353.81        n/a
Alloc. Mem      28.13 75011961258353.81 75011961258353.81
Num. Proc        0.08        n/a 3607713474246657.00
--------------------------------------------
Memory          28.13 75011961258353.81 3607713474246657.00

17. To Synchronize time between OpenVZ host and guest containers:
[Command ]# vzctl set CTID --capacity sys_timen --save






I hope this has been informative for you and I would like to thank you for reading it.