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recreating-an-instance-from-volume.rst

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Recreating an instance from volume

Note

This assumes that you have booted your instance from a volume and not using local storage such as with the NVME flavors <flavors>.

You can recreate an instance that is spawned from a volume by creating a snapshot on the volume, creating a new volume from that snapshot and then spawn a new instance from that volume.

Caution

Do not delete anything before first verifying that it works.

Note

The below instructions walkthrough how this is done when using /getting-started/managing-your-cloud/openstack-horizon.

Note

The new instance will have a new IP address, you need to update any internal DNS or configuration where this address might be referenced.

  • Shutdown the instance, perferably by logging into the instance and doing a clean shutdown from the operating system.
  • Create a snapshot </storage/snapshots/create-snapshot> of the volume the instance is booted from (also called root volume).
  • Create a new volume from the snapshot </storage/snapshots/create-volume-from-snapshot>.
  • Create a new instance </storage/persistent-block-storage/creating-an-instance-from-a-volume> from the new volume.
  • Detach </storage/persistent-block-storage/detach-volume> any additional volumes from the original instance and attach them to the new instance, refer to the documentation here </storage/persistent-block-storage/create-volume>.
  • If you have a floating IP assigned to the original instance move it to the new instance.
    • Under Project, click Compute and then Instances in the sidebar menu.
    • In the dropdown menu next to the old instance, press the small arrow and select Disassociate floating IP.
    • Select the floating IP (if you have several, repeat these steps for all).
    • Do not check Release Floating IP as this will release the floating IP from your project.
    • Click Disassociate.
    • Add the floating IP(s) to the new instance by following the instructions here </networking/floating-ips>.
  • You are now ready to start your new instance.

Caution

When deleting the old instance, please first verify that it has no extra volumes attached (only the root volume).

  • When you have verified that it works you can proceed to delete the old instance.