Pacemaker
Pacemaker is an open-source, high-availability cluster resource manager that ensures services remain available even in the event of node failures. It monitors and manages resources (like IP addresses, applications, and storage) across a cluster of servers, automatically restarting or relocating them if issues are detected. It is commonly used in Linux-based environments to provide fault tolerance for critical infrastructure.
Developers should learn Pacemaker when building or maintaining high-availability systems, such as web servers, databases, or enterprise applications that require minimal downtime. It is particularly useful in scenarios like disaster recovery, load balancing, and ensuring continuous service availability in cloud or on-premise clusters, often integrated with tools like Corosync for cluster communication.