OpenVZ Commands

openVZ Commands

For OpenVZ refer this URL: (https://openvz.org/User_Guide/Operations_on_Containers)

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vzlist -a   ------ To list all the containers on OpenVZ including running and stopped.

vzlist -a 101  ----- To check specific container is present or not (101 => Container ID)

/vz/template/cache  ------ Contains all the OS templates

/vz/private/  ----- it contains list of all the existing containers.


vzctl create 101 --ostemplate fedora-core-4 -–config vps.basic   ---- First give OS
vzctl create 101   ---- To create new container.
vzctl set 101 --onboot yes --save
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Setting Network Parameters 
====================
# vzctl set 101 --hostname test101.my.org --save 
# vzctl set 101 --ipadd 10.0.186.1 --save 
# vzctl set 101 --nameserver 192.168.1.165 --save 
==================== 


 
Setting root Password for VPS 
# vzctl set 101 --userpasswd root:test 



cat /proc/vz/veinfo   ------- Shows all the VPS containers along with assigned dedicated IP's.
=>  101 0 20 10.0.186.1   ( Where 20 represents no. of active processes running under container ID.)




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vzctl start 101 ----- To start particular container

vzctl stop 101   ----- To stop particular container
 
vzctl status 101  ---- To check the status of  particular container
 
vzctl stop 101 --fast     ----- To forcefully stop particular container by killing all the running processes on it.
 
vzctl restart 101   ----- For restarting specific containter.
 
vzctl destroy 101   ----- To delete container from node.
 
vzctl set 101 --disabled yes --save   ----- Disabling Container (After the Container stopping, the Container user will not be able to start it again until you enable this Container again by passing the --disabled no option to vzctl set. You can also use the --force option to start any disabled Container).

vzctl start 103 --force   ---- To start disabled container.

vzctl chkpnt 101 ---- Suspending Container

vzctl restore 101  ---- Unsuspending Container (You cannot change settings of the suspended Container).


Above command wont work if container is mounted. To destory that container, First stop it 
# vzctl stop 101 
# vzctl destroy 101 
# vzctl status 101 
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# ls /etc/sysconfig/vz-scripts/101.*    ------- it shows the logs for container destoryed
/etc/sysconfig/vz-scripts/101.conf.destroyed 



Use the vzctl exec VPS_ID command for running a command inside the VPS with the given ID. For ex. to restart SSH service for the particular container(Running Commands in Container)
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# vzctl exec 101 service sshd status 
# vzctl exec 101 service sshd start 
# vzctl exec 101 service sshd status

# vzctl exec 101 /etc/init.d/sshd status 
sshd is stopped 
# vzctl exec 101 /etc/init.d/sshd start 
Starting sshd:[ OK ] 
# vzctl exec 101 /etc/init.d/sshd status 
sshd (pid 26187) is running... 
==================================



If you wish to execute a command in all running VPS, you can use the following script: 
# for i in `vzlist –o veid -H`; do \ 
echo "VPS $i"; vzctl exec $i <command>; done





[checking that quota is on] 
# grep DISK_QUOTA /etc/sysconfig/vz 

[checking available space on /vz partition] 
# df /vz 

[editing VPS configuration file to add DISK_QUOTA=no] 
# vi /etc/sysconfig/vz-scripts/101.conf 

[checking that quota is off for VPS 101] 
# grep DISK_QUOTA /etc/sysconfig/vz-scripts/101.conf 

# vzctl exec 101 df 


vzcpucheck  ----- To  check the current  Hardware Node CPU utilization


# vzctl set 102 --cpuunits 1500 --cpulimit 4 --save 




VIMP - To check traffic on the node
====================
yum install iptraf


iptraf   --- To view all things
iptraf -h   ---- For help


-i iface    - start the IP traffic monitor (use "-i all" for all interfaces)
=> iptraf -i all    ------ To monitor all the interfaces of server
    iptraf -i em1  ------ To monitor specific interface on the server (In this case, em1 interface).
	
	
-g          - start the general interface statistics
=> iptraf -g


-d iface    - start the detailed statistics facility on an interface
=> iptraf -d em1


-s iface    - start the TCP and UDP monitor on an interface
=>iptraf -s em1


-z iface    - shows the packet size counts on an interface
=> iptraf -z em1


-l iface    - start the LAN station monitor ("-l all" for all LAN interfaces)
=> iptraf -l em1


-B          - run in background (use only with one of the above parameters)


-t timeout  - when used with one of the above parameters, tells the facility to run only for the specified number of minutes (timeout)
 
 -L logfile  - specifies an alternate log file for any direct invocation of a facility from the command line.  The log is placed in /var/log/iptraf if path is not specified.

-I interval - specifies the log interval for all facilities except the IP traffic monitor.  Value is in minutes.


-f          - clear all locks and counters.  Use with great caution. Normally used to recover from an abnormal termination.
====================




vzlist -o hostname,laverage,veid    -- To check the load on all containers

cat /proc/cpuinfo

/etc/init.d/vz restart

service lighttpd restart




For the iptraf instructions 
===========================
http://iptraf.seul.org/2.7/ifaces.html
http://blog.nexcess.net/2011/10/04/monitoring-linux-bandwidth-utilization-with-iptraf-and-iftop/
===========================