Linux High Availability Clustering

Design and deploy a high availability cluster to provide active/passive or active/active services using HA Pacemaker

This course helps you to understand high availability clustering by providing a strong concept and hands-on experience with Pacemaker and Corosync components of Red Hat / CentOS Enterprise High Availability Cluster.

Lab Design : KVM based lab setup in this course module.

Subtitle is not added in this course module.

Course Content:

Introduction

• What is clustering & cluster types?

• Advantages of Clustering Servers

• Concepts and techniques

• Resource and resource groups

• Failover, Fencing, Shared Storage, Quorum

• Cluster Architecture

• Lab Setup using KVM Environment

• Configuring a Basic Cluster

• Configuring a fencing agent using KVM host mahcine

• Troubleshooting fencing device

Managing Cluster Nodes

• Starting & Stopping Cluster Services

• Enabling & Disabling the Cluster Services

• Adding & Removing A Cluster Node

• The Standby & unstandby Nodes

• Quorum Operations

• Lab Session on quorum

• Managing Quorum Calculations

• Cluster Setup Switches

  1) wait_for_all

  2) auto_tie_breaker

Creating and Configuring Resources

• Create and configure high-availability resources.

• Creating a clustered Apache service

• Managing Resources

Troubleshooting High-Availability Cluster

• Inspect and configure cluster logging

• Troubleshooting resource failures

• Troubleshooting cluster network issues

  
  

Complex Resource Group

• Configuring an Active/Passive NFS Resource Group

• Lab Session

  
  

Managing Constraints

• Types of constraints:

• Order, Location & Colocation Constraint

• Practice Lab Session

  
  

Two Node Cluster Issues

• No room for node failure

• Split Brain

• Fence death/fence racing

• The cluster does not start until both nodes have started.

• Practice Lab Session

  
  

Managing iSCSI Initiators

• iSCSI fundamentals

• Configuring an iSCSI Server

• Several types of backing Storage

• block, fileio, pscsi & ramdisk

• Creating iSCSI Target

• Lab Session to create a block backstore from the targetcli shell

Managing High Availability Logical Volumes

• Clustered LVM & HA-LVM

• Lab Session to shared a disk (lun) to all cluster nodes

• Practice Lab Session on HA-LVM

Managing Clustered Logical Volumes

• Active/Active configuration of logical volumes

• Distributed Lock Manager (DLM) for lock management

• clvmd daemon

• Practice Lab Session

Global File System 2 (GFS2)

• GFS2 concepts

• Creating a GFS2 formatted Cluster File Systems

• Managing a GFS2 File System

• Managing a GFS2 Resource in the cluster

• Growing & Repairing a GFS2 File System