mongdb添加用户（使用密码登录）

1. 

user admin

db.createUser({user:"admin", pwd:"password", roles:[{role: "userAdminAnyDatabase", db: "admin"}]})

2. 使用权限启动MongoDB

./mongod --dbpath /path/to/ --logpath /path/to/ --auth

3. 创建用户

use admin

db.auth("admin", "password")

use mydb

db.createUser({user: "root", pwd: "password", roles: [ {role: "readWrite", db: "mydb"} ]})