What is the process for establishing connections to multiple databases using Laravel Sail?

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The process for establishing connections to multiple databases using Laravel Sail involves the following steps:

1. Create multiple database containers in Docker Compose file by specifying the required environment variables for each database service.

2. Configure the config/database.php file in your Laravel application with the new connections for each database.

3. Use the DB_CONNECTION environment variable to specify which connection to use for a given query. You can switch connections by updating the environment variable before running the query.

4. To migrate multiple databases, use the sail art migrate --database=CONNECTION_NAME command. You can replace CONNECTION_NAME with the actual name of the connection you want to migrate.

5. You can also run commands on a specific connection by prefixing the command with the CONNECTION_NAME parameter, for example sail exec mysql2 mysqldump ....

6. When performing migrations or running queries on a different connection than the default, you should specify the other connection's name either using the $onConnection property in your migration files, or the on() method when querying.

By following the above steps, you can easily establish multiple database connections in Laravel Sail.