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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
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, root volume size, and so on. The default nova flavors are not sufficient to create database instances. You might need to create or obtain some new nova flavors that work for databases.
The first step is to list flavors by using the
nova flavor-listcommand.Here are the default flavors, although you may have additional custom flavors in your environment:
$ nova flavor-list +-----+-----------+-----------+------+-----------+------+-------+-------------+-----------+ | ID | Name | Memory_MB | Disk | Ephemeral | Swap | VCPUs | RXTX_Factor | Is_Public | +-----+-----------+-----------+------+-----------+------+-------+-------------+-----------+ | 1 | m1.tiny | 512 | 1 | 0 | | 1 | 1.0 | True | | 2 | m1.small | 2048 | 20 | 0 | | 1 | 1.0 | True | | 3 | m1.medium | 4096 | 40 | 0 | | 2 | 1.0 | True | | 4 | m1.large | 8192 | 80 | 0 | | 4 | 1.0 | True | | 5 | m1.xlarge | 16384 | 160 | 0 | | 8 | 1.0 | True | +-----+-----------+-----------+------+-----------+------+-------+-------------+-----------+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 <create-database-instance>and use that flavor. - If your environment does not have a suitable flavor, an
administrative user must create a custom flavor by using the
nova flavor-createcommand.
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
$ nova flavor-create mysql-minimum 6 512 5 1 +----+---------------+-----------+------+-----------+------+-------+-------------+-----------+ | ID | Name | Memory_MB | Disk | Ephemeral | Swap | VCPUs | RXTX_Factor | Is_Public | +----+---------------+-----------+------+-----------+------+-------+-------------+-----------+ | 6 | mysql-minimum | 512 | 5 | 0 | | 1 | 1.0 | True | +----+---------------+-----------+------+-----------+------+-------+-------------+-----------+- If you have a custom flavor that meets the needs of the database
that you want to create, proceed to
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
myDBdatabase. - The database is based on the
mysqldata store and themysql-5.5datastore_version. - The
userAuser with thepasswordpassword.
$ trove 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} | +-------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+- Name of the instance:
Get the IP address of the database instance
First, use the
trove listcommand to list all instances and their IDs:$ trove 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
trove showcommand to get the IP address of the instance. In this example, replaceINSTANCE_IDwith5599dad6-731e-44df-bb60-488da3da9cfe.$ trove 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.
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_ADDRESSwith172.16.200.2.$ mysql -u userA -p password -h IP_ADDRESS myDB