Difference between revisions of "Qemu-img"

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**<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>
+
* <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: [[virsh blockresize]])
  
  

Revision as of 11:53, 8 January 2020

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


  • qemu-img create
    • qemu-img create -f qcow2 MY_IMAGE_NAME.img 3G
    • qemu-img create -f qcow2 -o preallocation=metadata,compat=1.1,lazy_refcounts=on MY_IMAGE_NAME.img
lazy_refcounts=on Reference count updates are postponed with the goal of avoiding metadata I/O and improving performance. Particularly interesting with cache=writethrough.
  • 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

See also

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