Database

In order for the new Docker Swarm to serve the Giraf project, the database from the old servers had to be migrated on to the new ones. In the following the old setup will be elaborated and the new setup will be explained.

Old Setup

The old server was configured to use MySQL 5.7.11 as can be seen on the picture below.

MySQL Version

In order to migrate the database without changing the database schema the same version of MySql. Using standard Mysql commands the database was dumped into a sql file using the following command:

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mysqldump -u root -p giraf-dev > giraf-dev-dump.sql

This command will dump the database giraf-dev to a local file giraf-dev-dump which can be exported to the new server and imported as to a new database.

New Setup

The Docker Compose files was updated with the following:

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DB:                     # Database service
    image: mysql:8.0.19 # Database version
    command: --default-authentication-plugin=mysql_native_password
    volumes:            # Mount the mysql folder from NFS to container
        - /swarm-nfs/mysql/:/var/lib/mysql/
    environment:        # Set local root password
        MYSQL_ROOT_PASSWORD: <Some password>
    networks:           # Attached network
        - backend
    deploy:             # Settings for deployment
        restart_policy:
            condition: on-failure

In order to make the MySQL service work inside a Docker Swarm the MySQL database files must be synchronized across all servers inside the Swarm. In order to facilitate this ITS at AAU created an NFS file share that could be mounted in all the servers. The NFS is mounted at /swarm-nfs/ on all the servers hence the mountpoint is the same across all servers.

Once the service is created an empty database will be served by default. The sql dump from the old setup was imported into the database using the following command:

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mysql -u root -p giraf-dev < giraf-dev-dump.sql

By executing this command the data stored in the sql dump will be migrated into the database.

This new setup will enable the database to be served from all the different servers inside the Swarm meaning that any of the servers can be terminated without effecting the overall status of the Giraf project.

Last update: September 18, 2024