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Linux-HA

Linux-HA. High-Availability Linux. Concepts of Linux-HA. Reliability Availability Serviceability. HA Clusters. What are HA clusters? High-availability clusters are groups of computers that support sever applications that can be reliably utilized with a minimum of down-time.

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Linux-HA

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  1. Linux-HA High-Availability Linux

  2. Concepts of Linux-HA • Reliability • Availability • Serviceability

  3. HA Clusters • What are HA clusters? • High-availability clusters are groups of computers that support sever applications that can be reliably utilized with a minimum of down-time. • Utilizes redundant computers in clusters that provide service when any system components fail.

  4. HA Clusters (cont.) • Failover – A process by which HA clusters detect hardware or software faults and restart the application on another system without requiring administrative intervention • Emphasis on a layered approach to redundancies

  5. Heartbeat Features • Primary software of Linux-HA is called Heartbeat • No fixed limit on nodes, allowing use with clusters of any size • Parallel resource monitoring – as with normal computing, but can shift resources from one node to another if the initial node fails • Automatically removes failed nodes from the cluster

  6. Heartbeat Features (cont.) • Integrates with many popular software packages, including: Apache, DB2, Oracle, PostgreSQL • GUI included for easier controlling and monitoring of the clusters and relevant resources

  7. Initial Designs • Originally capable of only handling two nodes at a time • Did not include resource monitoring • Would later switch to a layered design implementing n-node clusters

  8. Version 2.1.4 • Project was split into various separate packages • Pacemaker – Cluster resource manager component that handles resource management and node failure • Heartbeat – Now only refers to the layer used for communication between clusters and the individual nodes of the cluster.

  9. Version 2.1.4 • Resource Agents – a standardized interface for a cluster resource, used for translating operations to a cluster and determining success or failure per process • Cluster Glue – a set of libraries, tools, and utilities for use with Heartbeat and Pacemaker; this includes everything not covered by Heartbeat (messaging), Pacemaker (resource management), Resource Agents (cluster operations) • Local Resource Manager – similar to the Pacemaker, but solely exists for one client in the cluster, and is thus not “aware” of the status of the rest of the cluster

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