Pacemaker is an advanced, scalable high-availability cluster resource manager.
It supports "N-node" clusters with significant capabilities for managing resources and dependencies.
It will run scripts at initialization, when machines go up or down, when related resources fail and can be configured to periodically check resource health.

The world's most advanced open-source database cluster.
Galera Cluster for MySQL is a true Multi-Master Cluster based on synchronous replication. It’s an easy-to-use, high-availability solution, which provides high system up-time, no data loss and scalability for future growth.

Production-Grade Container Orchestration.
Kubernetes is an open-source system for automating deployment, scaling, and management of containerized applications.

BeeGFS (formerly FhGFS) is the leading parallel cluster file system, developed with a strong focus on performance and designed for very easy installation and management. If I/O intensive workloads are your problem, BeeGFS is the solution.