Create and access a database

Create and access a database

Assume that you have installed the Database service and populated your data store with images for the type and versions of databases that you want, and that you can create and access a database.

This example shows you how to create and access a MySQL 5.5 database.

Create and access a database

  1. Determine which flavor to use for your database

    When you create a database instance, you must specify a nova flavor. The flavor indicates various characteristics of the instance, such as RAM and root volume size. You will need to create or obtain new nova flavors that work for databases.

    The first step is to list flavors by using the openstack flavor list command.

    $ openstack flavor list
    

    Now take a look at the minimum requirements for various database instances:

    Database

    RAM (MB)

    Disk (GB)

    VCPUs

    MySQL

    512

    5

    1

    Cassandra

    2048

    5

    1

    MongoDB

    1024

    5

    1

    Redis

    512

    5

    1

    • If you have a custom flavor that meets the needs of the database that you want to create, proceed to Step 2 and use that flavor.

    • If your environment does not have a suitable flavor, an administrative user must create a custom flavor by using the openstack flavor create command.

    MySQL example. This example creates a flavor that you can use with a MySQL database. This example has the following attributes:

    • Flavor name: mysql_minimum

    • Flavor ID: You must use an ID that is not already in use. In this example, IDs 1 through 5 are in use, so use ID 6.

    • RAM: 512

    • Root volume size in GB: 5

    • Virtual CPUs: 1

    $ openstack flavor create mysql-minimum --id 6 --ram 512 --disk 5 --vcpus 1
    +----------------------------+---------------+
    | Field                      | Value         |
    +----------------------------+---------------+
    | OS-FLV-DISABLED:disabled   | False         |
    | OS-FLV-EXT-DATA:ephemeral  | 0             |
    | disk                       | 5             |
    | id                         | 6             |
    | name                       | mysql-minimum |
    | os-flavor-access:is_public | True          |
    | properties                 |               |
    | ram                        | 512           |
    | rxtx_factor                | 1.0           |
    | swap                       |               |
    | vcpus                      | 1             |
    +----------------------------+---------------+
    
  2. Create a database instance

    This example creates a database instance with the following characteristics:

    • Name of the instance: mysql_instance_1

    • Database flavor: 6

    In addition, this command specifies these options for the instance:

    • A volume size of 5 (5 GB).

    • The myDB database.

    • The database is based on the mysql data store and the mysql-5.5 datastore_version.

    • The userA user with the password password.

    $ openstack database instance create mysql_instance_1 6 --size 5 --databases myDB \
        --users userA:password --datastore_version mysql-5.5 \
        --datastore mysql
    +-------------------+---------------------------------------------------------------------------------------t-----------------------------------------------------------------------------------------------------------------+
    |      Property     |                                                                                                  Value                                                                                                  |
    +-------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
    |      created      |                                                                                           2014-05-29T21:26:21                                                                                           |
    |     datastore     |                                                                              {u'version': u'mysql-5.5', u'type': u'mysql'}                                                                              |
    | datastore_version |                                                                                                mysql-5.5                                                                                                |
    |       flavor      | {u'id': u'6', u'links': [{u'href': u'https://controller:8779/v1.0/46d0bc4fc32e4b9e8520f8fc62199f58/flavors/6', u'rel': u'self'}, {u'href': u'https://controller:8779/flavors/6', u'rel': u'bookmark'}]} |
    |         id        |                                                                                   5599dad6-731e-44df-bb60-488da3da9cfe                                                                                  |
    |        name       |                                                                                             mysql_instance_1                                                                                            |
    |       status      |                                                                                                  BUILD                                                                                                  |
    |      updated      |                                                                                           2014-05-29T21:26:21                                                                                           |
    |       volume      |                                                                                               {u'size': 5}                                                                                              |
    +-------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
    
  3. Get the IP address of the database instance

    First, use the openstack database instance list command to list all instances and their IDs:

    $ openstack database instance list
    +--------------------------------------+------------------+-----------+-------------------+--------+-----------+------+
    |                  id                  |       name       | datastore | datastore_version | status | flavor_id | size |
    +--------------------------------------+------------------+-----------+-------------------+--------+-----------+------+
    | 5599dad6-731e-44df-bb60-488da3da9cfe | mysql_instance_1 |   mysql   |     mysql-5.5     | BUILD  |     6     |  5   |
    +--------------------------------------+------------------+-----------+-------------------+--------+-----------+------+
    

    This command returns the instance ID of your new instance.

    You can now pass in the instance ID with the openstack database instance show command to get the IP address of the instance. In this example, replace INSTANCE_ID with 5599dad6-731e-44df-bb60-488da3da9cfe.

    $ openstack database instance show INSTANCE_ID
    
    +-------------------+--------------------------------------+
    |      Property     |                Value                 |
    +-------------------+--------------------------------------+
    |      created      |         2014-05-29T21:26:21          |
    |     datastore     |                mysql                 |
    | datastore_version |              mysql-5.5               |
    |       flavor      |                  6                   |
    |         id        | 5599dad6-731e-44df-bb60-488da3da9cfe |
    |         ip        |             172.16.200.2             |
    |        name       |           mysql_instance_1           |
    |       status      |                BUILD                 |
    |      updated      |         2014-05-29T21:26:54          |
    |       volume      |                  5                   |
    +-------------------+--------------------------------------+
    

    This command returns the IP address of the database instance.

  4. Access the new database

    You can now access the new database you just created (myDB) by using typical database access commands. In this MySQL example, replace IP_ADDRESS with 172.16.200.2.

    $ mysql -u userA -p password -h IP_ADDRESS myDB
    
Creative Commons Attribution 3.0 License

Except where otherwise noted, this document is licensed under Creative Commons Attribution 3.0 License. See all OpenStack Legal Documents.