--需要授权

mongod --logpath "D:\data\log\mongodb.log" --logappend --dbpath "D:\data\db" --auth --serviceName 

"MongoDBService" --serviceDisplayName "MongoDBService" --install

--不需要授权

mongod --logpath "D:\data\log\mongodb.log" --logappend --dbpath "D:\data\db" --serviceName 

"MongoDBServiceNoAuth" --serviceDisplayName "MongoDBServiceNoAuth" --install 

> use admin

switched to db admin

> db.system.version.find()

{ "_id" : "featureCompatibilityVersion", "version" : "3.4" }

{ "_id" : "authSchema", "currentVersion" : 5 } 

>db.dropUser('admin')

>db.dropUser('root')

>db.dropUser('dba')

>db.system.version.update({"_id":"authSchema"},{$set:{"currentVersion":3}}) 

> db.createUser({user:"admin",pwd:"********",roles:[{"role":"userAdminAnyDataba

se","db":"admin"},{"role":"readWrite","db":"qxkf"}]})

Successfully added user: {

  "user" : "admin",

  "roles" : [

    {

      "role" : "userAdminAnyDatabase",

      "db" : "admin"

    },

    {

      "role" : "readWrite",

      "db" : "qxkf"

    }

  ]

}