test>use admin

switched to db admin

admin>db.addUser('yshy','yshy')

{

        "user" : "yshy",

        "readOnly" : false,

        "pwd" : "2059c25b25df531ec5652d3eba0dc175",

        "_id" : ObjectId("5556a6da70d9c8c0f6a120ab")

}

admin>db.auth('yshy','yshy')

admin>db.system.users.find()

{ "_id" : ObjectId("545ab87bdc558a6592571d5b"), "user" : "yanshiying", "readOnly" : false, "pwd" : "044f63528e7807275411c4731052fe36" }

{ "_id" : ObjectId("5556a6da70d9c8c0f6a120ab"), "user" : "yshy", "readOnly" : false, "pwd" : "2059c25b25df531ec5652d3eba0dc175" }

admin>