With the immense growth of internet and its users, cloud computing, with its incredible possibilities in ease, quality of service and on-interest administrations has turned into a guaranteeing figuring stage for both business and non-business computation customers. It is an adoptable technology as it provides integration of software and resources which are dynamically scalable. The dynamic environment of cloud results in various unexpected faults and failures. The ability of a system to react gracefully to an unexpected equipment or programming malfunction is known as fault tolerance.