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KVM cheatsheet

Virtual machines are a great way to run multiple operating systems on one computer without having to deal with the hassle of dual-booting your computer and managing multiple bootloaders. Not to mention it also protects your hardware against unwanted failure and changes made by different operating systems.

That said, different types of virtual machines are managed differently and sometimes can be a bit too much for new users. To help you out, here’s a KVM cheatsheet with every Virsh command you need to know to manage KVM guest virtual machines.

Also read: ADB Commands Cheatsheet


Virsh Commands for KVM machines

Virsh is a management user interface for Virsh guest domains and can be used to create, pause, restart and shut down domains. The basic syntax for most Virsh commands is as follows.

virsh [option] [command] [domain] [arguements] 
CommandDescription
virsh nodeinfoDisplays the host node information and the machines that support virtualisation.
virsh list –allLists all (inactive and active) domains.
virsh listLists only active domains.
virsh domrename (current name) (new name)Renames the specified domain with the given new name.
virsh edit domainEdits the source file for the specific domain.
virsh start (machine name)Starts the specified virtual machine.
virsh autostart (machine name)Automatically starts the specified virtual machine on system boot.
virsh autostart –disable (machine name)Disables the autostart option for the specified virtual machine.
virsh stop (machine name)
virsh shutdown (machine name)
Shuts down the specified virtual machine.
virsh destroy (machine name)Forcefully shuts down the specified virtual machine.
for i in `sudo virsh list | grep running | awk ‘{print $2}’` do sudo virsh shutdown $iStops all running virtual machines.
virsh reboot (machine name)Restarts the specified virtual machine.
virsh undefine (machine name) –remove-all-storageRemoves the specified virtual machine along with its storage columns.
virsh install (machine name)Installs a new virtual machine.
The command also accepts additional arguments to specify the name, OS, hardware and so on.
virsh console (machine name)Connects to the specified machine’s console.
Use –force flag if an active session for the machine’s console already exists.
export EDITOR=nano/vim
virsh edit (machine name)
The first command specifies the editor and the virsh command opens the specified machine’s XML file for edits.
virsh suspend (machine name)Suspends the specified virtual machine.
virsh resume (machine name)Resumes the specified virtual machine.
virsh save (machine name) filename.savedSaves the current state of the specified machine to the specified file.
virsh restore filename.saveRestores a machine from the saved file state.
virsh vol-create-as (pool name) (volume name).qcow2 (size)Creates a volume of the specified size in the default storage pool.
virsh vol-list –pool default
virsh vol-list –pool (pool name)
Lists all volumes according to the specified pool.
virsh attach-disk –domain (machine name) \
–source (enter source) \
–persistent \
–target (target name)
Attaches a volume to the virtual machine.
Source determines the volume path.
Persistent makes live change persistent.
Target specifies the disk device target,
virsh detach-disk –domain (machine name) \
–persistent \
–target (target name)
Detaches a volume from the specified machine.
virsh pool-listLists storage pools.
virsh vol-delete (volume name).qcow2 –pool defaultDeletes the specified volume from the default pool.
virsh snapshot-create-as \
–domain (machine name)\
–name “Snapshot name” \
–description “Enter description”
Creates a snapshot of the specified machine.
virsh snapshot-revert
–domain (machine name)
–snapshotname (Snapshot name)
–running
Reverts the currently running snapshot.
virsh snapshot-revert
–domain (machine name)
–snapshotname (Snapshot name)
Deletes the specified snapshot.
virt-clone –connect qemu:///system \
–original (machine name)\
–name (clone machine name) \
–file path/to/filename.qcow2
Clones the specified machine.
virsh setvcpus
–domain (machine name)
–count (number of CPUs)
–config
Adds additional CPUs to the specified machine.
virsh setmaxmem (machine name) (memory size) –configSets the maximum memory of the specified machine.
virt-ls -l -d (machine name)  (drive directory)Moves to the specified directory in the machine.
virt-cat -d (machine name)  (drive directory)Uses Cat to open the specified file in the machine.
virt-edit -d (machine name)  (drive directory)Edits the specified file in the machine.
virt-df -d (machine name)Displays the specified machine’s disk usage.
sudo virt-filesystems -l -h -d (machine name)Shows the file systems on the specified machine.
Add –partition to see the partitions as well.
virt-topShows stats of virtualised machines.
sudo virt-log -d (machine name)Shows system logs of the specified machine.

Also read: Every Crosh command you need to know

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