Today we will learn about OpenVZ commands. Here is a list of some useful OpenVZ commands that should be run from the master node:
– To fetch the disk cost with the hostname and ctid of each container on the node.
vzlist -H -o veid,hostname,diskspace | awk '{ printf("%d\t%s\t%.2f GB\n", $1, $2, $3/(1024*1024))}'– To find the load average of each container on a node. A pretty useful command to find criminals.
vzlist -o ctid,laverage,hostname
-Using the PLOOP container? Use this command to clear some space.
vzctl compact [ctid]
-Change the number of CPUs allocated to a container by the following command
vzctl set [ctid] --cpus 4 --save
-This Commands to change the disk space allocated to a container.
vzctl set [ctid] --diskspace 480G:500G --save
-Commands to change the password of a container (including the root user)
vzctl set [ctid] --userpasswd [username]:[password]
-Commands to change/set the hostname of a container.
vzctl set [ctid] --hostname server.hostname.com --save
-Order to adjust/allocate RAM for containers.
vzctl set [ctid] --ram 1G --swap 2G --vm_overcommit 2 --save
[ctid] with 1 GB RAM, 2 GB swap, and (1+2)*2, i.e. 6 GB virtual memory. That means this container can allocate up to 6 GB of memory, but cannot use more than 3 GB.
You can also set vm_overcommit manually using the following commands:
64MB Guaranteed, 128MB Burstable
vzctl set [ctid] --vmguarpages 64M --save vzctl set [ctid] --oomguarpages 64M --save vzctl set [ctid] --privvmpages 64M:128M --save
1024MB Guaranteed, 2048MB Burstable
vzctl set [ctid] --vmguarpages 1024M --save vzctl set [ctid] --oomguarpages 1024M --save vzctl set [ctid] --privvmpages 1024M:2048M --save
-Starting, stopping, restarting, and querying the status of the container
Start a Container
vzctl start [ctid]
Stop a Container
vzctl stop [ctid]
Restart a Container
vzctl restart [ctid]
Status of a Container
vzctl status [ctid]
Listing Containers
vzlist -a
Deleting Container
vzctl stop [ctid] vzctl destroy [ctid]
Disabling Container
vzctl set [ctid] --disabled yes --save
Suspending Container
vzctl chkpnt [ctid]
Executing commands in the container
vzctl exec [ctid] /etc/init.d/sshd status
openssh-daemon is stopped
vzctl exec [ctid] /etc/init.d/sshd start
Starting sshd: [ OK ]
vzctl exec [ctid] /etc/init.d/sshd status
openssh-daemon (pid 9899) is running…
-Setting up SWAP space for containers
4GB SWAP Space
vzctl set [ctid] --swappages 4G:4G --save
Buy a dedicated server from Oudel Inc.
