181 lines
10 KiB
ReStructuredText
181 lines
10 KiB
ReStructuredText
.. _create_db:
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============================
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Create and access a database
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============================
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Assume that you have installed the Database service and populated your
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data store with images for the type and versions of databases that you
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want, and that you can create and access a database.
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This example shows you how to create and access a MySQL 5.5 database.
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Create and access a database
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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#. **Determine which flavor to use for your database**
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When you create a database instance, you must specify a nova flavor.
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The flavor indicates various characteristics of the instance, such as
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RAM, root volume size, and so on. The default nova flavors are not
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sufficient to create database instances. You might need to create or
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obtain some new nova flavors that work for databases.
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The first step is to list flavors by using the :command:`nova flavor-list`
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command.
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Here are the default flavors, although you may have additional custom
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flavors in your environment:
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.. code-block:: console
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$ nova flavor-list
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+-----+-----------+-----------+------+-----------+------+-------+-------------+-----------+
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| ID | Name | Memory_MB | Disk | Ephemeral | Swap | VCPUs | RXTX_Factor | Is_Public |
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+-----+-----------+-----------+------+-----------+------+-------+-------------+-----------+
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| 1 | m1.tiny | 512 | 1 | 0 | | 1 | 1.0 | True |
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| 2 | m1.small | 2048 | 20 | 0 | | 1 | 1.0 | True |
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| 3 | m1.medium | 4096 | 40 | 0 | | 2 | 1.0 | True |
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| 4 | m1.large | 8192 | 80 | 0 | | 4 | 1.0 | True |
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| 5 | m1.xlarge | 16384 | 160 | 0 | | 8 | 1.0 | True |
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+-----+-----------+-----------+------+-----------+------+-------+-------------+-----------+
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Now take a look at the minimum requirements for various database
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instances:
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+--------------------+--------------------+--------------------+--------------------+
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| Database | RAM (MB) | Disk (GB) | VCPUs |
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+====================+====================+====================+====================+
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| MySQL | 512 | 5 | 1 |
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+--------------------+--------------------+--------------------+--------------------+
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| Cassandra | 2048 | 5 | 1 |
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+--------------------+--------------------+--------------------+--------------------+
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| MongoDB | 1024 | 5 | 1 |
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+--------------------+--------------------+--------------------+--------------------+
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| Redis | 512 | 5 | 1 |
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+--------------------+--------------------+--------------------+--------------------+
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- If you have a custom flavor that meets the needs of the database
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that you want to create, proceed to
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:ref:`Step 2 <create-database-instance>` and use that flavor.
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- If your environment does not have a suitable flavor, an
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administrative user must create a custom flavor by using the
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:command:`nova flavor-create` command.
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**MySQL example.** This example creates a flavor that you can use
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with a MySQL database. This example has the following attributes:
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- Flavor name: ``mysql_minimum``
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- Flavor ID: You must use an ID that is not already in use. In this
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example, IDs 1 through 5 are in use, so use ID ``6``.
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- RAM: ``512``
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- Root volume size in GB: ``5``
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- Virtual CPUs: ``1``
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.. code-block:: console
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$ nova flavor-create mysql-minimum 6 512 5 1
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+----+---------------+-----------+------+-----------+------+-------+-------------+-----------+
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| ID | Name | Memory_MB | Disk | Ephemeral | Swap | VCPUs | RXTX_Factor | Is_Public |
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+----+---------------+-----------+------+-----------+------+-------+-------------+-----------+
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| 6 | mysql-minimum | 512 | 5 | 0 | | 1 | 1.0 | True |
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+----+---------------+-----------+------+-----------+------+-------+-------------+-----------+
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.. _create-database-instance:
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#. **Create a database instance**
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This example creates a database instance with the following
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characteristics:
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- Name of the instance: ``mysql_instance_1``
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- Database flavor: ``6``
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In addition, this command specifies these options for the instance:
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- A volume size of ``5`` (5 GB).
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- The ``myDB`` database.
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- The database is based on the ``mysql`` data store and the
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``mysql-5.5`` datastore\_version.
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- The ``userA`` user with the ``password`` password.
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.. code-block:: console
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$ trove create mysql_instance_1 6 --size 5 --databases myDB \
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--users userA:password --datastore_version mysql-5.5 \
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--datastore mysql
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+-------------------+---------------------------------------------------------------------------------------t------------------------------------------------------------------------------------------------------------------+
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| Property | Value |
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+-------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| created | 2014-05-29T21:26:21 |
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| datastore | {u'version': u'mysql-5.5', u'type': u'mysql'} |
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| datastore_version | mysql-5.5 |
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| 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'}]} |
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| id | 5599dad6-731e-44df-bb60-488da3da9cfe |
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| name | mysql_instance_1 |
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| status | BUILD |
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| updated | 2014-05-29T21:26:21 |
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| volume | {u'size': 5} |
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+-------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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#. **Get the IP address of the database instance**
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First, use the :command:`trove list` command to list all instances and
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their IDs:
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.. code-block:: console
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$ trove list
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+--------------------------------------+------------------+-----------+-------------------+--------+-----------+------+
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| id | name | datastore | datastore_version | status | flavor_id | size |
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+--------------------------------------+------------------+-----------+-------------------+--------+-----------+------+
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| 5599dad6-731e-44df-bb60-488da3da9cfe | mysql_instance_1 | mysql | mysql-5.5 | BUILD | 6 | 5 |
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+--------------------------------------+------------------+-----------+-------------------+--------+-----------+------+
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This command returns the instance ID of your new instance.
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You can now pass in the instance ID with the :command:`trove show` command
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to get the IP address of the instance. In this example, replace
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``INSTANCE_ID`` with ``5599dad6-731e-44df-bb60-488da3da9cfe``.
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.. code-block:: console
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$ trove show INSTANCE_ID
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+-------------------+--------------------------------------+
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| Property | Value |
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+-------------------+--------------------------------------+
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| created | 2014-05-29T21:26:21 |
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| datastore | mysql |
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| datastore_version | mysql-5.5 |
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| flavor | 6 |
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| id | 5599dad6-731e-44df-bb60-488da3da9cfe |
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| ip | 172.16.200.2 |
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| name | mysql_instance_1 |
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| status | BUILD |
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| updated | 2014-05-29T21:26:54 |
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| volume | 5 |
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+-------------------+--------------------------------------+
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This command returns the IP address of the database instance.
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#. **Access the new database**
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You can now access the new database you just created (myDB) by using
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typical database access commands. In this MySQL example, replace
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``IP_ADDRESS`` with ``172.16.200.2``.
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.. code-block:: console
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$ mysql -u userA -ppassword -h IP_ADDRESS myDB
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