Editing Qemu-img

<code>qemu-img</code><ref>https://manpages.debian.org/testing/qemu-utils/qemu-img.1.en.html</ref> allows you to create, convert and modify images offline, It can handle all image formats supported by [[KVM/qemu|QEMU]].


* <code>[[/qemu-img info/]]</code><ref>https://manpages.debian.org/testing/qemu-utils/qemu-img.1.en.html</ref> 
* <code>[[/qemu-img bench/]]</code>

* <code>[[/qemu-img create/]]</code>
** <code>qemu-img create -f qcow2 MY_IMAGE_NAME.img 3G</code>
** <code>qemu-img create -f qcow2 -o preallocation=metadata,compat=1.1,lazy_refcounts=on MY_IMAGE_NAME.img</code>
:::<code>lazy_refcounts=on</code> Reference count updates are postponed with the goal of avoiding metadata I/O and improving performance. Particularly interesting with cache=writethrough.
* Create a snapshot: <code> qemu-img create -f qcow2 -o backing_file=original snapshot.qcow</code><ref>http://libguestfs.org/virt-sysprep.1.html#copying-and-cloning</ref>


* <code>qemu-img convert</code>
* <code>qemu-img check</code>
**<code>qemu-img check -r all</code>

* <code>qemu-img resize YOUR_IMAGE.qcow2 +SIZE</code><ref>https://maunium.net/blog/resizing-qcow2-images/</ref> ([[KVM/Extend LVM on qcow2 images]])<ref>https://serverfault.com/questions/324281/how-do-you-increase-a-kvm-guests-disk-space</ref>

* <code>[[qemu-img snapshot]]</code> (See also: <code>[[linux Administration/Devices and Filesystems/LVM/lvcreate|lvcreate]] --snapshot</code> for LVM snapshots)

== Activities ==
* [[KVM/Extend LVM on qcow2 images]]


== See also ==
* <code>virt-install</code> python script
* [[virt-manager]]
* https://en.wikibooks.org/w/index.php?title=QEMU/Images

{{CC License}}
Source: wikiversity
@@ Line 1: / Line 1: @@
-<code>qemu-img</code><ref>https://manpages.debian.org/testing/qemu-utils/qemu-img.1.en.html</ref> allows you to create, convert and modify images offline include in <code>[[qemu-utils]]</code> package. It can handle all image formats supported by [[QEMU]].
+<code>qemu-img</code><ref>https://manpages.debian.org/testing/qemu-utils/qemu-img.1.en.html</ref> allows you to create, convert and modify images offline, It can handle all image formats supported by [[KVM/qemu|QEMU]].
-* <code>[[qemu-img info]] MY_image-qcow.qcow2</code><ref>https://manpages.debian.org/testing/qemu-utils/qemu-img.1.en.html</ref>
+* <code>[[/qemu-img info/]]</code><ref>https://manpages.debian.org/testing/qemu-utils/qemu-img.1.en.html</ref>
-** <code>[[qemu-img info]] --backing-chain MY_image-qcow.qcow2</code>
+* <code>[[/qemu-img bench/]]</code>
-* <code>[[qemu-img bench]]</code>
-* <code>[[qemu-img create]]</code>
+* <code>[[/qemu-img create/]]</code>
+** <code>qemu-img create -f qcow2 MY_IMAGE_NAME.img 3G</code>
+** <code>qemu-img create -f qcow2 -o preallocation=metadata,compat=1.1,lazy_refcounts=on MY_IMAGE_NAME.img</code>
+:::<code>lazy_refcounts=on</code> Reference count updates are postponed with the goal of avoiding metadata I/O and improving performance. Particularly interesting with cache=writethrough.
 * Create a snapshot: <code> qemu-img create -f qcow2 -o backing_file=original snapshot.qcow</code><ref>http://libguestfs.org/virt-sysprep.1.html#copying-and-cloning</ref>
-* <code>[[qemu-img snapshot]]</code> (See also: <code>[[lvcreate]] --snapshot</code> for LVM snapshots)
-* <code>[[qemu-img convert]]</code> (Related commands: <code>[[virt-clone]]</code>)
-* <code>[[qemu-img check]]</code>
+* <code>qemu-img convert</code>
+* <code>qemu-img check</code>
 **<code>qemu-img check -r all</code>
-* <code>[[qemu-img resize]] YOUR_IMAGE.qcow2 +SIZE</code><ref>https://maunium.net/blog/resizing-qcow2-images/</ref> ([[Extend LVM on qcow2 images]])<ref>https://serverfault.com/questions/324281/how-do-you-increase-a-kvm-guests-disk-space</ref> (See also: <code>[[virsh blockresize]]</code> and <code>[[virt-filesystems]]</code>)
+* <code>qemu-img resize YOUR_IMAGE.qcow2 +SIZE</code><ref>https://maunium.net/blog/resizing-qcow2-images/</ref> ([[KVM/Extend LVM on qcow2 images]])<ref>https://serverfault.com/questions/324281/how-do-you-increase-a-kvm-guests-disk-space</ref>
-* <code>[[qemu-img commit]]</code>
-* <code>[[qemu-img compare]]</code>
+* <code>[[qemu-img snapshot]]</code> (See also: <code>[[linux Administration/Devices and Filesystems/LVM/lvcreate|lvcreate]] --snapshot</code> for LVM snapshots)
 == Activities ==
-* [[Extend LVM on qcow2 images]]
+* [[KVM/Extend LVM on qcow2 images]]
-* Read qemu-img superuser questions: https://superuser.com/questions/tagged/qemu?tab=Votes
-== Related commands ==
-* <code>[[virt-builder]]</code>
-* <code>[[virt-install]]</code>
-* <code>[[guestfish]]</code>
-* <code>[[virt-rescue]]</code>
-* [[Images]]
 == See also ==
-* {{qemu-img}}
+* <code>virt-install</code> python script
-* {{virtinst}}
+* [[virt-manager]]
-* {{QEMU}}
 * https://en.wikibooks.org/w/index.php?title=QEMU/Images
-* {{KVM}}
-{{CC license}}
+{{CC License}}
 Source: wikiversity
-[[Category:Virtualization]]