Editing Virsh snapshot-create-as
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:<code>--disk-only</code> Do not save memory information | :<code>--disk-only</code> Do not save memory information | ||
:<code>--atomic</code> | :<code>--atomic</code> | ||
| − | :<code>--no-metadata</code> snapshot data is created, but any metadata is discarded (so libvirt does not treat the snapshot as current, and cannot revert to the snapshot unless <code>[[virsh snapshot-create]]</code> is used to teach [[libvirt]] about discarded metadata information). Useful if you plan to | + | :<code>--no-metadata</code> snapshot data is created, but any metadata is discarded (so libvirt does not treat the snapshot as current, and cannot revert to the snapshot unless <code>[[virsh snapshot-create]]</code> is used to teach [[libvirt]] about discarded metadata information). Useful if you plan to merge snapshots otherwise at a later point you have to explicitly clean the libvirt metadata (by invoking: <code>[[virsh snapshot-delete]] vm1 --metadata [name|--current]</code>)<ref>https://wiki.libvirt.org/page/Live-disk-backup-with-active-blockcommit</ref> (See also: <code>[[virsh snapshot-list]]</code>) |
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== Examples == | == Examples == | ||
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<pre> virsh snapshot-create-as --domain MY_VM --name "Snapshot_disk_only_2019_08_MY_VM" --description "Disk snapshot only to disk" --disk-only --live --atomic </pre> <ref>https://www.cyberciti.biz/faq/how-to-create-create-snapshot-in-linux-kvm-vmdomain/</ref> | <pre> virsh snapshot-create-as --domain MY_VM --name "Snapshot_disk_only_2019_08_MY_VM" --description "Disk snapshot only to disk" --disk-only --live --atomic </pre> <ref>https://www.cyberciti.biz/faq/how-to-create-create-snapshot-in-linux-kvm-vmdomain/</ref> | ||
| − | * Create a '''external''' snapshot <code> | + | * Create a '''external''' snapshot <code>--diskspec</code> option, also using <code>--no-metadata</code> |
<pre>virsh snapshot-create-as --domain MY_VM --name "napshot_disk_only_2019_08_MY_VM" --description "Disk snapshot only to disk" --disk-only --no-metadata --atomic --diskspec $TARGET,snapshot=external</pre> | <pre>virsh snapshot-create-as --domain MY_VM --name "napshot_disk_only_2019_08_MY_VM" --description "Disk snapshot only to disk" --disk-only --no-metadata --atomic --diskspec $TARGET,snapshot=external</pre> | ||
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: <code>--quiesce</code> Libvirt will try to use guest agent to freeze and unfreeze domain’s mounted file systems. However, if domain has no guest agent, snapshot creation will fail. <ref>https://blog.devzero.be/post/kvm-live-vm-backup/</ref> | : <code>--quiesce</code> Libvirt will try to use guest agent to freeze and unfreeze domain’s mounted file systems. However, if domain has no guest agent, snapshot creation will fail. <ref>https://blog.devzero.be/post/kvm-live-vm-backup/</ref> | ||
:: <code>error: argument unsupported: [[QEMU guest agent]] is not configured</code><ref>https://www.redhat.com/archives/libvirt-users/2015-December/msg00009.html</ref> (See: <code>[[virsh edit]]</code>) | :: <code>error: argument unsupported: [[QEMU guest agent]] is not configured</code><ref>https://www.redhat.com/archives/libvirt-users/2015-December/msg00009.html</ref> (See: <code>[[virsh edit]]</code>) | ||
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== Activities == | == Activities == | ||
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# [[Virsh create live backups]] using <code>[[virsh snapshot-create-as]]</code> and <code>[[virsh blockcommit]]</code> | # [[Virsh create live backups]] using <code>[[virsh snapshot-create-as]]</code> and <code>[[virsh blockcommit]]</code> | ||
| − | * Related commands: | + | * Related commands: [[virsh snapshot-info]] (Allows for example to verify if snapshot is internal or external) |
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== Related commands == | == Related commands == | ||
* <code>[[virsh blockcommit]]</code> | * <code>[[virsh blockcommit]]</code> | ||
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== See also == | == See also == | ||
* {{virsh snapshot}} | * {{virsh snapshot}} | ||
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* {{QEMU}} | * {{QEMU}} | ||
[[Category:KVM]] | [[Category:KVM]] | ||
[[Category:Linux]] | [[Category:Linux]] | ||
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