788b49f554
This patch: - renames all the RST files in the ops-guide folder to use a hyphen instead of underscore; - adds redirects to the renamed files to .htacces; - removes /([a-z-]+) from Admin Guide redirects in .htacces. Change-Id: I4c35a4c89ae9900a2e9bfe1a7a3bcb94ab72454b Implements: blueprint consistency-file-rename
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Databases
Almost all OpenStack components have an underlying database to store persistent information. Usually this database is MySQL. Normal MySQL administration is applicable to these databases. OpenStack does not configure the databases out of the ordinary. Basic administration includes performance tweaking, high availability, backup, recovery, and repairing. For more information, see a standard MySQL administration guide.
You can perform a couple of tricks with the database to either more quickly retrieve information or fix a data inconsistency error—for example, an instance was terminated, but the status was not updated in the database. These tricks are discussed throughout this book.
Database Connectivity
Review the component's configuration file to see how each OpenStack
component accesses its corresponding database. Look for either
sql_connection or simply connection. The
following command uses grep to display the SQL connection
string for nova, glance, cinder, and keystone:
# grep -hE "connection ?=" /etc/nova/nova.conf /etc/glance/glance-*.conf \
/etc/cinder/cinder.conf /etc/keystone/keystone.conf
sql_connection = mysql+pymysql://nova:nova@cloud.alberta.sandbox.cybera.ca/nova
sql_connection = mysql+pymysql://glance:password@cloud.example.com/glance
sql_connection = mysql+pymysql://glance:password@cloud.example.com/glance
sql_connection = mysql+pymysql://cinder:password@cloud.example.com/cinder
connection = mysql+pymysql://keystone_admin:password@cloud.example.com/keystoneThe connection strings take this format:
mysql+pymysql:// <username> : <password> @ <hostname> / <database name>Performance and Optimizing
As your cloud grows, MySQL is utilized more and more. If you suspect that MySQL might be becoming a bottleneck, you should start researching MySQL optimization. The MySQL manual has an entire section dedicated to this topic: Optimization Overview.