How to print a sentence when users on the server run mongo shell?

For DBAs to limit some dangerous functionalities like dropping a database or it can be a helpful message. Or a greeting message. Or even printing the default database that he is already connected to.

By default mongoDB looks for a file named .mongorc.js in your home directory. So create a file ~/.mongorc.js and put a content like below inside of it:

print("Hello! Welcome to Alireza company :)");
 print("Your database is set to: " + db);

That's it! Save the file and run mongo in your terminal, the output should be similar to the following:

$ mongo
 MongoDB shell version v3.6.2
 connecting to: mongodb://127.0.0.1:27017
 MongoDB server version: 3.6.2
 Your database is set to: test
 Hello! Welcome to Alireza company :)
 >

In order to disable dangerous functionalities:

var no = function() { print("oops! You are not allowed to drop anything!!");};

 // Prevent dropping databases
 db.dropDatabase = DB.prototype.dropDatabase = no;

 // Prevent dropping collections
 DBCollection.prototype.drop =no;

 // Prevent dropping indexes
 DBCollection.prototype.dropIndex = no;

Sample output:

> db.dropDatabase('bi')
 oops! You are not allowed to drop anything!!.

NOTE: You can disable loading your .mongorc.js by using the --norc option when starting the shell.

#mongodb #mongo #shell #mongorc