Qemu-img: Difference between revisions
Jump to navigation
Jump to search
(→check) |
|||
Line 44: | Line 44: | ||
qemu-img check <filename> | qemu-img check <filename> | ||
</pre> | </pre> | ||
==create== | |||
==snapshot== | ==snapshot== |
Revision as of 17:43, 4 July 2017
External
Internal
Overview
qemu-img is a command-line tool used to create, format, convert, modify and verify virtual machine images offline. It can handle all image formats supported by QEMU.
qemu-img must not be used to modify images in use by a running virtual machine or any other process - this may destroy the image. If an image is queried while it is modified by another process may result in an inconsistent state.
Sub-Commands
info
qemu info <filename>
qemu-img info /main-storage-pool/testvm-01.img
image: /main-storage-pool/testvm-01.img file format: qcow2 virtual size: 4.0G (4294967296 bytes) disk size: 1.3G cluster_size: 65536 Format specific information: compat: 1.1 lazy refcounts: true
check
Performs a consistency check of the virtual machine image file, if the format is "qcow2", "qed" or "vdi". The command output can be in either "human" or "json" format.
qemu-img check <filename>
create
snapshot
List the Existent Snapshots
All snapshots present in a disk image can be listed with:
qemu-img snapshot -l <volume-name>
Snapshot list: ID TAG VM SIZE DATE VM CLOCK 1 appproxy-test-snapshot.qcow2 0 2017-07-04 10:20:45 00:00:00.000
Revert the Disk to a Saved State
The following command applies the snapshot specified by the tag, which means the disk will be reverted to the state specified by the snapshot.
qemu-img snapshot -a <snapshot-tag> <volume-name>
Example:
qemu-img snapshot -a before_the_installation /main-storage-pool/appproxy.qcow2
Delete the Snapshot=
qemu-img snapshot -d <snapshot-tag> <volume-name>