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→MySQL
MySQL is used to allow storage and retrieval of structured data. SQL is used by countless services for all kinds of use cases. Again we won't spend much time learning the details of MySQL configuration but you need a basic server set up. You may remember setting up MySQL from OPS235 - we're doing the nearly identical thing here.
Install MySQL. You may notice that it's actually called MariaDB now. They are two separate projects run by different stakeholders groups but they are compatible so you can use documentation from one to configure the other. Make sure you have not just the client but also the server software. When you start the service - you'll get some instructions in the log file about setting a root password. Even though we won't configure our service to be accessible over the network - you should get into the habit of doing this with every MySQL installation you ever make.