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Pre-requisite: EWC - OpenStack Command-Line client |
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Foreword
When Before backing up resources in OpenStack, it's important to understand the difference between two three primary methods:
- VM Images Intance Snapshots (Glance): These capture the entire virtual machine, including the operating system, applications, and configuration. VM images Instance snapshots are useful for cloning VMs, creating templates, or disaster recovery scenarios. They're managed through the Glance service.
- Volume Snapshots (Cinder): These are delta copies of the block storage volumes. Volume snapshots are not full copies and rely on the original volume for restoration, so they are mostly useful for accident recovery. They're managed through the Cinder service.
- Volume Backups (Cinder): These are point-in-time copies of block storage volumes. Volume backups preserve the data within a volume and can be used to restore the volume to the exact state it was in when backed up. They're ideal for data recovery and are managed through the Cinder service.
Choose the appropriate method based on your recovery needs: volume backups for data recovery, VM images for full system recovery or replicationinstance snapshots for full system recovery or replication, volume snapshots for accident prevention and recovery or volume backups for full data recovery.
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Before starting make sure you are in the machine where you configured openstack client and you can run openstack commands as described in EWC - OpenStack Command-Line client |
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Backup
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VMs and volumes
Instance Snapshots
To take a snapshot of a instance for later recovery or replication, one must create an image based on the current VM. The list of VMs/servers than can be used for the snapshot can be found with
List available image
To list all available images:
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openstack imageserver list |
Creating VM Images Snapshots
The following command creates the image SERVER by taking a And, to create the image snapshot of a running server.VM with name or id <server> use the command
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openstack server image create --name IMAGE<image_NAMEname> SERVER<server> |
Wherewhere:
--name IMAGE<image_NAMEname>: The name for the new image snapshotSERVER<server>: The name of your server (as given by openstack server list)./ VM.
Lastly, to see the list of images, including the recent snapshot
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openstack image list |
and the specific details of the created image
```
openstack image show <image_name>
```
Volume Backups
List available backups
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