KVM command set management virtual machine

One ,KVM Basic commands  

 1. View command help

virsh -h

2. see KVM The directory where the configuration files are stored

ls /etc/libvirt/qemu/

3. View virtual machine status

virsh list --all

4. Shut down and power on the virtual machine

virsh shutdown centos7
virsh destroy centos7

5. Force the instance system to power off

virsh destroy centos7

6. Start the virtual machine system instance through the configuration file

virsh create /etc/libvirt/qemu/contos7.xml
virsh list --all

7. Suspend virtual machine

virsh suspend centos7
virsh list --all

8. Restore virtual machine

virsh resume centos7
virsh list --all

9. Configure the virtual machine to start automatically with the host

virsh autostart centos7

10. Export virtual machine configuration

virsh dumpxml centos7 > /etc/libvirt/qemu/centos7-2.xml

11. Delete and add virtual machine

virsh shutdown centos7
virsh undefine centos7

 Redefining virtual machines 
cd /etc/libvirt/qemu
mv centos7-2.xml centos7.xml
virsh define centos7.xml
virsh list --all

12. Modify virtual machine configuration information

vim /etc/libvirt/qemu/centos7.xml

virsh edit centos7

Two ,KVM file management

1. View the current disk format

qemu-img info /data_kvm/store/centos7.qcow2

2. adopt qemu-img Command to convert disk file format , take centos7 The virtual machine raw Format disk conversion to qcow2 Format

virsh shutdown centos7
qemu-img convert -f raw -O qcow2 /data_kvm/store/centos7.img /data_kvm/store/centos7.qcow2

 modify centos7 Of xml Disk type and disk file name in the configuration file 
virsh edit centos7

3. virt-cat, similar cat command

vist-cat -a /data_kvm/store/centos7.qcow2 /etc/sysconfig/grub

4.virt-edit, Edit the file , Usage and vim Agreement

virt-edit -a /data_kvm/store/centos7.qcow2 /etc/resolv.conf

5.virt-df The command is used to view virtual machine disk information

vist -df -h centos7

3、 ... and , Clone virtual machine

1. View virtual machine status  

virsh list --all

 2. from centos7 clone centos7-2

virt-clon -o centos7 -n centos7-2 -f /data_kvm/store/centos7.qcown2

3. View virtual machine status

virsh list --all

4. Start virtual machine

virsh start centos7

Four , Virtual machine snapshot

1. Yes centos7 Create a snapshot

virsh snapshot-create centos7

2. View virtual machine snapshot version information

virsh snapshot-current centos7

3. View snapshot information

virsh snapshot-list centos7

4. Restore the virtual machine state to { Number }

virsh snapshot-revert centos7  code 

5. Delete snapshot

virs snapshot-delete centos7  code