1. MongoDB

To run MongoDB (i.e. the mongod process) as a macOS service, run:

```
brew services start mongodb-community
```

To stop a mongod running as a macOS service, use the following command as needed:

```
brew services stop mongodb-community
```

2. MySQL

After the installation is complete, you can start the MySQL service using the following command:

```
brew services start mysql
```

Open Terminal and use the following command to stop the MySQL service:

```
brew services stop mysql
```

Create database MySQL

```
mysql -u root -p
SHOW DATABASES;
CREATE DATABASE order_service;
```