安装 MongoDB 数据库
通过 HomeBrew 安装 MongoDB 数据库：
brew install mongodb/brew/mongodb-community
MongoDB 配置文件路径：/usr/local/etc/mongod.conf
在前台运行 MongoDB
mongod --config /usr/local/etc/mongod.conf
在后台运行 MongoDB
brew services start mongodb/brew/mongodb-community
停止运行 MongoDB
brew services stop mongodb-community
mongodb-community 成功运行但是无法连接问题
问题记录：
$ mongo
MongoDB shell version v4.2.1
connecting to: mongodb://127.0.0.1:27017/?compressors=disabled&gssapiServiceName=mongodb
2019-12-06T13:51:26.558+0800 E QUERY [js] Error: couldn't connect to server 127.0.0.1:27017, connection attempt failed: SocketException: Error connecting to 127.0.0.1:27017 :: caused by :: Connection refused :
connect@src/mongo/shell/mongo.js:341:17
@(connect):2:6
2019-12-06T13:51:26.563+0800 F - [main] exception: connect failed
2019-12-06T13:51:26.563+0800 E - [main] exiting with code 1
这个问题通常是因为 Mac 系统的数据卷权限导致的，终端下执行以下命令，更改 MongoDB 数据库目录即可：
mongod --dbpath /usr/local/var/
参考：MongoDB can't find data directory after upgrading to Mac OS 10.15 (Catalina)
