mongodb 添加用户 权限 设置

[root@localhost]# mongo
MongoDB shell version: 2.4.6
connecting to: tank

 > use admin                    //切换到admin数据库
   switched to db admin
 > show collections;
   system.indexes
   system.users                   //用户表
> db.system.users.find();      //用户表没有数据
> db.addUser('tank','test');   //添加一个管理员账号
{
  "user" : "tank",
  "readOnly" : false,
  "pwd" : "988432606980d0695e4f668f6bbc643a",
  "_id" : ObjectId("529e5d543b6a4608ac833429")
}