How to install MongoDB on amazone linux and connect it to Laravel-jenssegers MongoDB?

I followed this for installing mongodb on Amazon Linux. I have a laravel project to host on my amazon Linux server. Jenssegers mongoDB is already installed in the framework while developing the web app (in Ubuntu).

The web app was developed in Ubuntu 12.04 LTS, and it was working properly.

When I hosted it on the server I am getting error:

Class 'MongoClient' not found

My questions are 1. How can I configure mongodb on amazone linux?

(now when i do sudo service mongod restart it is showing FAILED)

2.What all are the configurations that must be changed in the web app(which is done in Ubuntu) in order to use mongodb?

I am using PHP54

httpd 24

Laravel 4.2