无论出于何种原因，每当我尝试将 MongoDB 作为服务启动 (sudo service mongod start) 时，我都会收到以下错误：
启动 mongod.service 失败：未找到单元 mongod.service。我按照安装步骤提到以下链接 mongo db安装 失败
system> sudo systemctl start mongodb
Failed to start mongodb.service: Unknown unit: mongodb.service
当我尝试sudo mongod：
MongoDB shell version: 3.2.13 connecting to: -
2017-06-03T16:19:28.513+0530 W NETWORK [thread1]
Failed to connect to 127.0.0.1:27017, in(checking socket for error after poll), reason: errno:111 Connection refused
2017-06-03T16:19:28.514+0530 E QUERY [thread1]
Error: couldn't connect to server 127.0.0.1:27017, connection attempt failed : connect@src/mongo/shell/mongo.js:229:14 @(connect):1:6 exception: connect failed
当我尝试mongod --repair： …