Task: Add and configure HyperDB plugin to work with master and slave MySQL databases.
Configure MySQL master and slave from instructions in this post: http://scalan.com/docker-setup-mysql-master-slave/.
Add WordPress container to docker-compose file:
... wordpress: image: wordpress:php7.2 depends_on: - mysqldb-master - mysqldb-slave ports: - "80:80" restart: always environment: WORDPRESS_DB_HOST: mysqldb-master:3306 WORDPRESS_DB_USER: testuser WORDPRESS_DB_PASSWORD: testuser WORDPRESS_DB_NAME: testdb volumes: - ./app:/var/www/html - ./logs:/var/log
Build docker environment… Wait till MySQL master and slave will be created and configured…
Open http://localhost and setup WordPress:
Download HyperDB plugin from WP site and put it into: db.php to wp-content db-config to root WP directory
Configure db-config.php: (find and set two database objects. First to work with master (writer) and second to work with slave (reader) )
/** * This is the most basic way to add a server to HyperDB using only the * required parameters: host, user, password, name. * This adds the DB defined in wp-config.php as a read/write server for * the 'global' dataset. (Every table is in 'global' by default.) */ $wpdb->add_database(array( 'host' => 'mysqldb-master', // If port is other than 3306, use host:port. 'user' => DB_USER, 'password' => DB_PASSWORD, 'name' => DB_NAME, 'write' => 1, 'read' => 1, )); /** * This adds the same server again, only this time it is configured as a slave. * The last three parameters are set to the defaults but are shown for clarity. */ $wpdb->add_database(array( 'host' => 'mysqldb-slave', // If port is other than 3306, use host:port. 'user' => DB_USER, 'password' => DB_PASSWORD, 'name' => DB_NAME, 'write' => 0, 'read' => 1, ));
Check site working… Open http://localhost:
To be sure that configuration is correct create test post and check it on the home page.