Configuring a MySQL Datasource in Apache Tomcat
This page tells you how to set up a MySQL datasource connection for Confluence.
Step 1. Shut down Confluence
bin/stop-confluence.batto bring down Confluence while you are making these changes.
- Make a backup of your
<CONFLUENCE_HOME>/confluence.cfg.xmlfile and your
<CONFLUENCE_INSTALLATION>/conf/server.xmlfile, so that you can easily revert if you have a problem.
Step 2. Install the MySQL database driver
- Download the MySQL JDBC driver. See Database JDBC Drivers for links.
- Unpack the archive file you have downloaded, and find the JAR file called something like
mysql-connector-java-x.x.x-bin.jar, where x.
x.xis a version number.
- Copy the driver JAR file to the
/libdirectory of your Confluence installation directory.
Step 3. Configure Tomcat
- Edit the
conf/server.xmlfile in your Confluence installation directory.
Find the following lines:
<Context path="" docBase="../confluence" debug="0" reloadable="true"> <!-- Logger is deprecated in Tomcat 5.5. Logging configuration for Confluence is specified in confluence/WEB-INF/classes/log4j.properties -->
Insert the following DataSource
Resourceelement directly after the lines above (inside the
Contextelement, directly after the opening
<!-- If you're using Confluence 5.7 or below; change maxTotal to maxActive --> <Resource name="jdbc/confluence" auth="Container" type="javax.sql.DataSource" username="yourusername" password="yourpassword" driverClassName="com.mysql.jdbc.Driver" url="jdbc:mysql://localhost:3306/confluence?useUnicode=true&characterEncoding=utf8" maxTotal="60" maxIdle="20" defaultTransactionIsolation="READ_COMMITTED" validationQuery="Select 1" />
yourpasswordwith the actual credentials for your database.
- In the
urlparameter, replace '
confluence' with the name of the database your Confluence data will be stored in.
maxIdledefine the number of database connections that will be allowed at one time, and the number that will be kept open when there is no database activity. These can be adjusted based on your requirements. See the Apache Tomcat 8 Datasource documentation for more information.
- If switching from a direct JDBC connection to a datasource connection, you can find the above details in your
- The configuration properties for Tomcat's standard datasource resource factory (
org.apache.tomcat.dbcp.dbcp.BasicDataSourceFactory) are as follows:
driverClassName– Fully qualified Java class name of the JDBC driver to be used.
maxTotal– The maximum number of database connections in the pool at the same time.
maxIdle– The maximum number of connections that can sit idle in this pool at the same time.
maxWaitMillis– The maximum number of milliseconds that the pool will wait (when there are no available connections) for a connection to be returned before throwing an exception.
password– Database password to be passed to your JDBC driver.
url– Connection URL to be passed to your JDBC driver. (For backwards compatibility, the property
driverNameis also recognized.)
user– Database username to be passed to your JDBC driver.
validationQuery– SQL query that can be used by the pool to validate connections before they are returned to the application. If specified, this query must be an SQL SELECT statement that returns at least one row.
- Why is the
validationQueryelement needed? When a database server reboots, or there is a network failure, all the connections in the connection pool are broken and this normally requires an application server reboot. However, the Commons DBCP (Database Connection Pool) which is used by the Tomcat application server can validate connections before issuing them by running a simple SQL query, and if a broken connection is detected, a new one is created to replace it. To do this, you will need to set the
validationQueryoption on the database connection pool.
Step 4. Configure the Confluence web application
- Edit the
confluence/WEB-INF/web.xmlfile in your Confluence installation directory.
Insert the following element just before
</web-app>near the end of the file:
<resource-ref> <description>Connection Pool</description> <res-ref-name>jdbc/confluence</res-ref-name> <res-type>javax.sql.DataSource</res-type> <res-auth>Container</res-auth> </resource-ref>
If you are changing an existing Confluence installation over to using a Tomcat datasource:
- Edit the
- Delete any line that contains a property that begins with
Insert the following at the start of the
<property name="hibernate.setup"><![CDATA[true]]></property> <property name="hibernate.dialect"><![CDATA[com.atlassian.hibernate.dialect.MySQLDialect]]></property> <property name="hibernate.connection.datasource"><![CDATA[java:comp/env/jdbc/confluence]]></property>
Step 5. Restart Confluence
bin/start-confluence.bat to start Confluence with the new settings.