Step 1, enter the MongoDB with admin privilege
$ mongo
$ use admin
MongoDB Enterprise > db.auth("admin","wysheid") # provide admin user and password
Step2, create a user with only Read privilege
MongoDB Enterprise > db.createUser({user: "user1",pwd: "test", roles: [{role:"read", db: "school"}]})
Step3, enter the MongoDB with the new user to test
$ mongo
MongoDB Enterprise > db.auth("user1","test")
MongoDB Enterprise > use school
MongoDB Enterprise > show collections
MongoDB Enterprise > db.class.find()