METHOD FOR HIGH AVAILABILITY OF SERVICES IN CLOUD COMPUTING SYSTEMS

System for providing a high availability (HA) of services, includes a plurality of nodes forming a cluster. Some nodes have services running on them such that the cluster has only a single instance of that service; node locks active while accessing the active nodes; a router providing access to services hosted on the nodes. Services utilize the resources subject to the node locks. An HA master daemon running on one of the nodes. HA daemons on each node track availability of services hosted on the nodes and generate requests to HA master daemon to restore failed services and redirect the router to live services. The HA daemons activate node locks. Master daemon re-launches services on another node and updates the router. A target node executes a lock revoke to acquire the node lock from the source node when the services of the source node are live-migrated from the source node.