Shulou(Shulou.com)06/02 Report--

KVM Management of KVM Virtualization (2)

KVM management operation

Virsh is a common management tool for kvm virtual machines.

1. Virsh command format:

Virsh parameter kvm virtual machine name

2. Common parameters of virsh:

View running KVM virtual machines

Virsh list

View all KVM virtual machines

Virsh list-all

Turn on the KVM virtual machine

Virsh start centos7

Shut down the KVM virtual machine

Virsh shutdown centos7

Unplug the power supply and turn it off (forced shutdown)

Virsh destroy centos7

Export configuration

Virsh dumpxml centos7

# Delete configuration

Virsh undefine centos7

Import configuration

Virsh define centos7

Modify configuration

Virsh edit centos7

Rename the KVM virtual machine (not supported in earlier versions)

Virsh dormrename centos7

Suspend KVM virtual machine

Virsh suspend centos7

Restore (unsuspend) the KVM virtual machine

Virsh resume centos7

Boot the KVM virtual machine automatically

Virsh autostart centos7

Turn off the boot and automatically start the KVM virtual machine

Virsh autostart-disable centos7

Query the KVM port number of the VNC virtual machine

Virsh vncdisplay centos7

View CPU information of a virtual machine

Virsh nodeinfo

Start the default network

Virsh net-start default

Self-starting the default network

Virsh net-autostart default

Disk format conversion of KVM virtual machine

Two commonly used disk formats for KVM virtual machines

Raw: bare format, takes up a lot of space (directly takes up physical hard disk), is not suitable for remote transmission, does not support snapshot function, but has fast writing and good performance.

Qcow2:cow (copy on write) takes up less space (how many disks are used), is suitable for transmission, supports compression, snapshots, mirroring, and has a slightly worse performance than raw.

Disk format conversion

Common commands of qemu-img

/ / create a virtual disk

Qemu-img create test.raw 10G

Qemu-img create-f qcow2 test.qcow2 10G

/ / View virtual disk information

Qemu-img info test.raw

/ / resize the capacity of virtual disk

Qemu-img resize test.raw + 5G

/ / disk format conversion (convert test.raw to centos7.qcow2)

Qemu-img convert-f raw-O qcow2 test.raw centos7.qcow2

Note: the virtual machine must be turned off for further disk conversion

Parameter description:

Convert converts disk files to files in the specified format

-f specifies the file format of the file to be converted

-O specify the target format to be converted after the conversion is completed, a new target image file will be produced and the original file will still be saved.

Snapshot Management of KVM Virtual Machine

1. Check the disk format, if the raw format needs to be converted to qcow2 format

/ / create a snapshot

Virsh snapshot-create centos7

/ / check the latest snapshot version of the current virtual machine

[root@kvm-node1 ~] # virsh snapshot-current centos7 | less

/ / Snapshot xml file storage path

[root@kvm-node1 ~] # ls / var/lib/libvirt/qemu/snapshot/centos7/

/ / View snapshots (can view a series of numbers, restore and delete by numbers)

Virsh snapshot-list centos7

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