Backup and restore a database

You can use Database services to backup a database and store the backup artifact in the Object Storage service. Later on, if the original database is damaged, you can use the backup artifact to restore the database. The restore process creates a database instance.

This example shows you how to back up and restore a MySQL database.

  1. Backup the database instance

    As background, assume that you have created a database instance with the following characteristics:

    • Name of the database instance: guest1

    • Flavor ID: 10

    • Root volume size: 2

    • Databases: db1 and db2

    • Users: The user1 user with the password password

    First, get the ID of the guest1 database instance by using the openstack database instance list command:

    $ openstack database instance list

+--------------------------------------+--------+-----------+-------------------+--------+-----------+------+
|                  id                  |  name  | datastore | datastore_version | status | flavor_id | size |
+--------------------------------------+--------+-----------+-------------------+--------+-----------+------+
| 97b4b853-80f6-414f-ba6f-c6f455a79ae6 | guest1 |   mysql   |     mysql-5.5     | ACTIVE |     10    |  2   |
+--------------------------------------+--------+-----------+-------------------+--------+-----------+------+

    Back up the database instance by using the openstack database backup create command. In this example, the backup is called backup1. In this example, replace INSTANCE_ID with 97b4b853-80f6-414f-ba6f-c6f455a79ae6:

    Note

    This command syntax pertains only to python-troveclient version 1.0.6 and later. Earlier versions require you to pass in the backup name as the first argument.

    $ openstack database backup create INSTANCE_ID backup1

+-------------+--------------------------------------+
|   Property  |                Value                 |
+-------------+--------------------------------------+
|   created   |         2014-03-18T17:09:07          |
| description |                 None                 |
|      id     | 8af30763-61fd-4aab-8fe8-57d528911138 |
| instance_id | 97b4b853-80f6-414f-ba6f-c6f455a79ae6 |
| locationRef |                 None                 |
|     name    |               backup1                |
|  parent_id  |                 None                 |
|     size    |                 None                 |
|    status   |                 NEW                  |
|   updated   |         2014-03-18T17:09:07          |
+-------------+--------------------------------------+

    Note that the command returns both the ID of the original instance (instance_id) and the ID of the backup artifact (id).

    Later on, use the openstack database backup list command to get this information:

    $ openstack database backup list
+--------------------------------------+--------------------------------------+---------+-----------+-----------+---------------------+
|                  id                  |             instance_id              |   name  |   status  | parent_id |       updated       |
+--------------------------------------+--------------------------------------+---------+-----------+-----------+---------------------+
| 8af30763-61fd-4aab-8fe8-57d528911138 | 97b4b853-80f6-414f-ba6f-c6f455a79ae6 | backup1 | COMPLETED |    None   | 2014-03-18T17:09:11 |
+--------------------------------------+--------------------------------------+---------+-----------+-----------+---------------------+

    You can get additional information about the backup by using the openstack database backup show command and passing in the BACKUP_ID, which is 8af30763-61fd-4aab-8fe8-57d528911138.

    $ openstack database backup show BACKUP_ID

+-------------+----------------------------------------------------+
|   Property  |                   Value                            |
+-------------+----------------------------------------------------+
|   created   |              2014-03-18T17:09:07                   |
| description |                   None                             |
|      id     |                 8af...138                          |
| instance_id |                 97b...ae6                          |
| locationRef | http://10.0.0.1:.../.../8af...138.xbstream.gz.enc  |
|     name    |                 backup1                            |
|  parent_id  |                  None                              |
|     size    |                  0.17                              |
|    status   |               COMPLETED                            |
|   updated   |           2014-03-18T17:09:11                      |
+-------------+----------------------------------------------------+

  2. Restore a database instance

    Now assume that your guest1 database instance is damaged and you need to restore it. In this example, you use the openstack database instance create command to create a new database instance called guest2.

    • You specify that the new guest2 instance has the same flavor (10) and the same root volume size (2) as the original guest1 instance.

    • You use the --backup argument to indicate that this new instance is based on the backup artifact identified by BACKUP_ID. In this example, replace BACKUP_ID with 8af30763-61fd-4aab-8fe8-57d528911138.

    $ openstack database instance create guest2 10 --size 2 --backup BACKUP_ID

+-------------------+----------------------------------------------+
|      Property     |                Value                         |
+-------------------+----------------------------------------------+
|      created      |         2014-03-18T17:12:03                  |
|     datastore     | {u'version': u'mysql-5.5', u'type': u'mysql'}|
|datastore_version  |                mysql-5.5                     |
|       flavor      | {u'id': u'10', u'links': [{u'href': ...]}    |
|         id        |  ac7a2b35-a9b4-4ff6-beac-a1bcee86d04b        |
|        name       |                guest2                        |
|       status      |                 BUILD                        |
|      updated      |          2014-03-18T17:12:03                 |
|       volume      |             {u'size': 2}                     |
+-------------------+----------------------------------------------+

  3. Verify backup

    Now check that the new guest2 instance has the same characteristics as the original guest1 instance.

    Start by getting the ID of the new guest2 instance.

    $ openstack database instance list

+-----------+--------+-----------+-------------------+--------+-----------+------+
|     id    |  name  | datastore | datastore_version | status | flavor_id | size |
+-----------+--------+-----------+-------------------+--------+-----------+------+
| 97b...ae6 | guest1 |   mysql   |     mysql-5.5     | ACTIVE |     10    |  2   |
| ac7...04b | guest2 |   mysql   |     mysql-5.5     | ACTIVE |     10    |  2   |
+-----------+--------+-----------+-------------------+--------+-----------+------+

    Use the openstack database instance show command to display information about the new guest2 instance. Pass in guest2’s INSTANCE_ID, which is ac7a2b35-a9b4-4ff6-beac-a1bcee86d04b.

    $ openstack database instance show INSTANCE_ID

+-------------------+--------------------------------------+
|      Property     |                Value                 |
+-------------------+--------------------------------------+
|      created      |         2014-03-18T17:12:03          |
|     datastore     |                mysql                 |
| datastore_version |              mysql-5.5               |
|       flavor      |                  10                  |
|         id        | ac7a2b35-a9b4-4ff6-beac-a1bcee86d04b |
|         ip        |               10.0.0.3               |
|        name       |                guest2                |
|       status      |                ACTIVE                |
|      updated      |         2014-03-18T17:12:06          |
|       volume      |                  2                   |
|    volume_used    |                 0.18                 |
+-------------------+--------------------------------------+

    Note that the data store, flavor ID, and volume size have the same values as in the original guest1 instance.

    Use the openstack database db list command to check that the original databases (db1 and db2) are present on the restored instance.

    $ openstack database db list INSTANCE_ID

+--------------------+
|        name        |
+--------------------+
|        db1         |
|        db2         |
| performance_schema |
|        test        |
+--------------------+

    Use the openstack database user list command to check that the original user (user1) is present on the restored instance.

    $ openstack database user list INSTANCE_ID

+--------+------+-----------+
|  name  | host | databases |
+--------+------+-----------+
| user1  |  %   |  db1, db2 |
+--------+------+-----------+

  4. Notify users

    Tell the users who were accessing the now-disabled guest1 database instance that they can now access guest2. Provide them with guest2’s name, IP address, and any other information they might need. (You can get this information by using the openstack database instance show command.)

  5. Clean up

    At this point, you might want to delete the disabled guest1 instance, by using the openstack database instance delete command.

    $ openstack database instance delete INSTANCE_ID