Difference between revisions of "Qemu-img"

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<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]].
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<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 info]] MY_image-qcow.qcow2</code><ref>https://manpages.debian.org/testing/qemu-utils/qemu-img.1.en.html</ref>  
 
* <code>[[qemu-img info]] MY_image-qcow.qcow2</code><ref>https://manpages.debian.org/testing/qemu-utils/qemu-img.1.en.html</ref>  
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** <code>[[qemu-img info]] --backing-chain MY_image-qcow.qcow2</code>
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* <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>
 
* 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 snapshot]]</code> (See also: <code>[[lvcreate]] --snapshot</code> for LVM snapshots)
  
* <code>qemu-img convert</code>
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* <code>[[qemu-img convert]]</code> (Related commands: <code>[[virt-clone]]</code>)
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* <code>[[qemu-img check]]</code>
 
* <code>[[qemu-img check]]</code>
 
**<code>qemu-img check -r all</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>)
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* <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>)
  
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* <code>[[qemu-img commit]]</code>
  
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* <code>[[qemu-img compare]]</code>
  
 
== Activities ==
 
== Activities ==
 
* [[Extend LVM on qcow2 images]]
 
* [[Extend LVM on qcow2 images]]
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* Read qemu-img superuser questions: https://superuser.com/questions/tagged/qemu?tab=Votes
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== Related commands ==
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* <code>[[virt-builder]]</code>
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* <code>[[virt-install]]</code>
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* <code>[[guestfish]]</code>
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* <code>[[virt-rescue]]</code>
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* [[Images]]
  
 
== See also ==
 
== See also ==

Latest revision as of 19:04, 30 August 2021

qemu-img[1] allows you to create, convert and modify images offline include in qemu-utils package. It can handle all image formats supported by QEMU.



  • Create a snapshot: qemu-img create -f qcow2 -o backing_file=original snapshot.qcow[3]
  • qemu-img snapshot (See also: lvcreate --snapshot for LVM snapshots)

Activities[edit]

Related commands[edit]

See also[edit]

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