This runs a new container using version 0.8 of the debezium/example-mysql image, which is based on the mysql:5.7 image, defines and populate a sample "inventory" database, and creates a debezium user with password dbz that has the minimum privileges required by Debezium’s MySQL connector. The command assigns the name mysql to the container so that it can be easily referenced later. The -it flag makes the container interactive, meaning it attaches the terminal’s standard input and output to the container so that you can see what is going on in the container. The --rm flag instructs Docker to remove the container when it is stopped. The command maps port 3036 (the default MySQL port) in the container to the same port on the Docker host so that software outside of the container can connect to the database server. And finally, it also uses the -e option three times to set the MYSQL_ROOT_PASSWORD, MYSQL_USER, and MYSQL_PASSWORD environment variables to specific values.