Difference between revisions of "Qemu-img"
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** <code>qemu-img create -f qcow2 -o preallocation=metadata,compat=1.1,lazy_refcounts=on MY_IMAGE_NAME.img</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. | :::<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. | ||
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* 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 convert</code> | * <code>qemu-img convert</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> | * <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> | ||
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== Activities == | == Activities == | ||
Revision as of 16:31, 6 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 createqemu-img create -f qcow2 MY_IMAGE_NAME.img 3Gqemu-img create -f qcow2 -o preallocation=metadata,compat=1.1,lazy_refcounts=on MY_IMAGE_NAME.img
lazy_refcounts=onReference 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 --snapshotfor LVM snapshots)
qemu-img convertqemu-img checkqemu-img check -r all
qemu-img resize YOUR_IMAGE.qcow2 +SIZE[4] (Extend LVM on qcow2 images)[5]
Activities
See also
virtinst(package):virt-install,virt-clone,virt-convertandvirt-xml- QEMU:
qemu-img,qemu-ga,qemu.conf,virsh qemu, QEMU guest agent (qemu-ga), qcow2,qemu-nbd, qemu-img map,qemu-io,/etc/libvirt/qemu.conf, QEMU releases, VENOM,qemu-nbd --help, qemu-system - https://en.wikibooks.org/w/index.php?title=QEMU/Images
- KVM, Installation, QEMU,
virsh,virtinst,libguestfs-tools, libvirt, qemu, Red Hat Virtualization (RHV), MacVTap, Virtio, oVirt, KVM services, KVM networking, KVM graphics, CPU, KVM on ARM
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Source: wikiversity
- ↑ https://manpages.debian.org/testing/qemu-utils/qemu-img.1.en.html
- ↑ https://manpages.debian.org/testing/qemu-utils/qemu-img.1.en.html
- ↑ http://libguestfs.org/virt-sysprep.1.html#copying-and-cloning
- ↑ https://maunium.net/blog/resizing-qcow2-images/
- ↑ https://serverfault.com/questions/324281/how-do-you-increase-a-kvm-guests-disk-space
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