Udemy Linux High Availability Clustering

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

What you'll learn

• Students should understand HA cluster concepts and how to manage different nodes, start/stop services
• Creating High-Availability Clusters
• Managing Cluster Nodes and Quorum
• Managing Fencing
• Creating and Configuring Resources
• Managing Constraints
• About Order, Location & Colocation Constraints
• Troubleshooting High-Availability Clusters
• Controlling Complex Resource groups
• Managing Two Node Clusters
• Concept about Split Brain, Fence death/fence racing
• Managing iSCSI Initiators
• Configuring & Managing High-Availability Logical Volumes
• Managing Clustered Logical Volumes
• GFS2 Concepts
• Creating a GFS2 formatted Cluster File Systems
• Growing & Repairing a GFS2 File System

Requirements

• PC or Laptop with internet Connection
• Red Hat Certified Engineer (RHCE) certification or equivalent experience.
• CentOS 7, RHEL7 ISO Image
• Vmware workstation

Description
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

Who this course is for:

• Linux High Availability Clustering course is aimed at senior system administrators responsible for maximizing resiliency though high availability clustering services