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Pierre Blanc 8549e3358a Docs: Add guide to migrate instance with snapshot

Import the user guide cli-use-snapshots-to-migrate-instances
available on the old openstack-manuals repository.

This user guide describe how to migrate an instance based on a cloud
to another.

It is updated with openstack cli commands.

Change-Id: I17c87ee90b3d271a54026b8bdbad066bdc750c38

2018-08-08 22:50:05 +00:00

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Use snapshots to migrate instances

This guide can be used to migrate an instance between different clouds.

To use snapshots to migrate instances from OpenStack projects to clouds, complete these steps.

In the source project:

Create_a_snapshot_of_the_instance
Download_the_snapshot_as_an_image

In the destination project:

Import_the_snapshot_to_the_new_environment
Boot_a_new_instance_from_the_snapshot

Note

Some cloud providers allow only administrators to perform this task.

Create a snapshot of the instance

Shut down the source VM before you take the snapshot to ensure that all data is flushed to disk. If necessary, list the instances to view the instance name:

$ openstack server list
+--------------------------------------+------------+--------+------------------+--------------------+-------------------------+
| ID                                   | Name       | Status | Networks         | Image              | Flavor                  |
+--------------------------------------+------------+--------+------------------+--------------------+-------------------------+
| d0d1b7d9-a6a5-41d3-96ab-07975aadd7fb | myInstance | ACTIVE | private=10.0.0.3 | ubuntu-16.04-amd64 | general.micro.tmp.linux |
+--------------------------------------+------------+--------+------------------+--------------------+-------------------------+

Use the openstack server stop command to shut down the instance:
```
$ openstack server stop myInstance
```

Use the openstack server list command to confirm that the instance shows a SHUTOFF status:

$ openstack server list
+--------------------------------------+------------+---------+------------------+--------------------+-------------------------+
| ID                                   | Name       | Status  | Networks         | Image              | Flavor                  |
+--------------------------------------+------------+---------+------------------+--------------------+-------------------------+
| d0d1b7d9-a6a5-41d3-96ab-07975aadd7fb | myInstance | SHUTOFF | private=10.0.0.3 | ubuntu-16.04-amd64 | general.micro.tmp.linux |
+--------------------------------------+------------+---------+------------------+--------------------+-------------------------+

Use the openstack server image create command to take a snapshot:

$ openstack server image create --name myInstanceSnapshot myInstance

Use the openstack image list command to check the status until the status is ACTIVE:

$ openstack image list
+--------------------------------------+---------------------------+--------+
| ID                                   | Name                      | Status |
+--------------------------------------+---------------------------+--------+
| ab567a44-b670-4d22-8ead-80050dfcd280 | myInstanceSnapshot        | active |
+--------------------------------------+---------------------------+--------+

Download the snapshot as an image

Get the image ID:

$ openstack image list
+--------------------------------------+---------------------------+--------+
| ID                                   | Name                      | Status |
+--------------------------------------+---------------------------+--------+
| ab567a44-b670-4d22-8ead-80050dfcd280 | myInstanceSnapshot        | active |
+--------------------------------------+---------------------------+--------+

Download the snapshot by using the image ID that was returned in the previous step:
```
$ openstack image save --file snapshot.raw ab567a44-b670-4d22-8ead-80050dfcd280
```
Note

The openstack image save command requires the image ID and cannot use the image name. Check there is sufficient space on the destination file system for the image file.
Make the image available to the new environment, either through HTTP or direct upload to a machine (scp).

Import the snapshot to the new environment

In the new project or cloud environment, import the snapshot:

$ openstack image create --container-format bare --disk-format qcow2 \
  --file snapshot.raw myInstanceSnapshot

Boot a new instance from the snapshot

In the new project or cloud environment, use the snapshot to create the new instance:

$ openstack server create --flavor m1.tiny --image myInstanceSnapshot myNewInstance

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