Published on 14/04/2015 Visit Us: http://kerneltraining.com/linux-cluster/ Email Us: sales@kerneltraining.com Phone: 91 8099 77 6681 Red Hat Cluster suite is a package that enables users to deploy its high available services on Red Hat Linux-based servers. And, the suite as three main features that are a cluster management and service failover, network load-balancing, and global read-write file system (GFS). You can understand clearly what are the essentials to run a cluster, and what actually cluster comprises in it. Certain terms are like fencing, cluster services / resource group, cluster resources, failover domains, Red Hat components, CLVM clustered LVM, and more about Global File System, GFS. When you enroll for Red Hat Linux Cluster in Kernel Training, it is easy to learn Red Hat cluster suite that can enable you in building a Linux cluster, and it can also be learnt when you follow a Linux cluster tutorial hosted online. Course participants can understand everything about Linux cluster configuration, Linux cluster architecture, and also about Linux cluster management console in detail. After completion of the Red Hat Linux Cluster course, you will learn as RedHat Linux cluster configuration. You can also learn about Linux Clustering building and maintaining Linux clusters. The built-in features do allow Linux cluster on Centos 6 &7 and also Linux clustering and storage management. Course Curriculum Module 1 Red Hat Cluster Suite Introduction Topics: Introduction: Red Hat Cluster Suite Module 2 Cluster Infrastructure Topics: Cluster Infrastructure Module 3 Shared Storage configuration using ISCSI SERVE Topics: Shared Storage configuration using ISCSI SERVE Module 4 Cluster Administration Tools Topics: Concepts: Cluster Administration Tools Module 5 Cluster Components Topics: Cluster Components Module 6 Agent/Server Architecture Topics: Conga, luci, ricci Module 7 Cluster Administration GUI Topics: Cluster Administration GUI Module 8 Command Line Administration Tools Topics: Cluster Administration GUI Module 9 Cluster Management Topics: Cluster management. Module 10 Lock Management Topics: Lock management Module 11 Fencing Topics: Fencing Module 12 Cluster Configuration System Topics: Cluster Configuration System Module 13 High-availability Service Management Topics: High-availability Service Management Module 14 Clustered LVM (CLVM) Topics: Clustered LVM (CLVM) Module 15 Red Hat Global File System Topics: Red Hat Global File System Module 16 Installing Red Hat High Availability Add-On software Topics: Installing Red Hat High Availability Add-On software Module 17 Configure and Deploy Apache Cluster services Topics: Configure and Deploy Apache Cluster services Module 18, 19, 20, 21 Configure and Deploy MYSQL Cluster services Configure and Deploy SAMBA services on Cluster Configure and Deploy NFS services on Cluster How to Deploy Oracle DB as a clu

1. RED HAT CLUSTER
SUITE
.

2. RED HAT CLUSTER SUITE
OVERVIEW

3. What is Red Hat Cluster Suite
• Red Hat server is a suite of packages that
can be used to deploy highly available
services on Red Hat Linux-based servers
• Provides three main features:
• – Cluster management and service failover
• – Network load-balancing (LVS)
• – Global read-write file system (GFS) (HPC)

4. What is required to run a
cluster?
• Two or more Servers either physical or
Virtual.
• Two or more bonded NICs to send cluster
heartbeat messages over (this is optional,
but highly recommended!)
• Two or more bonded NICs dedicated to
public network traffic
• Supported fencing solution
• Shared storage

5. What does a cluster consist of?
An HA cluster typically consists of the following items:
• Two or more nodes
• One or more fence devices
• Shared storage
• Public and private network interfaces
• One or more resources
• One or more services
• Quorum devices
• Failover Domains

6. Quorum devices
• Quorum is used to ensure that a majority of nodes are
available in the cluster
• Needed to avoid split-brain conditions
• Works by assigning one or more votes to each server and
quorum device in the cluster
• To ensure quorum, a cluster needs to have 51% of the
available votes to form or continue running an
operational cluster

7. Fencing devices
• Fencing devices provide a way for the cluster to remove
an unresponsive node from the cluster
• Nodes are typically fenced when they are unresponsive,
and fencing is done to prevent split brain configurations
• Several supported ways to fence nodes:
• – IPMI (Intelligent Platform Management Interface)
• – Power Fencing
• – SAN fencing
• – VMware virtual centre fencing, RHEVM, KVM fencing etc.
• – Vendor specific methods
• – HP –ILO (Integrated Lights Out)
• – Dell – DRAC ( Dell Remote Access Control)
• – IBM Blade Centres

8. Cluster resources
• Cluster resources provide the basic unit of configuration in a
cluster
• Several types of resources exist by default:
• – Apache
• – GFS
• – MYSQL
• – Oracle
• – Samba
• – NFS
• – Tomcat
• – IP Address
• – Start/Stop Scripts
• – Services

9. Cluster Services/ Resource
Group
• Services are collections of resources that serve a specific
purpose
• An example of this would be an HA APACHE service that
contains three resources:
• – An IP address resource that is tied to the APACHE
webpage database instance
• – File system resources that contain the web page ex:
/var/www/html
• – httpd services that starts, stops and verifies that http is
running (script: /etc/init.d/httpd)

10. Failover domains
• Failover domains allow you to define where services
should go when a service faults and is migrated to
another node
• Each failover domain can have a unique list of nodes, and
each node can be assigned a priority to tell the cluster it
is a better candidate to run the service

11. Red Hat Cluster Components
• Luci
• Ricci
• Conga
• CMAN (Cluster Manager)
• RGManager (Resource Group Manager)
• CLVM ( Clustered LVM)
• GFS (Global File System)

12. CLVM – OVERVIEW

13. CLVM – Clustered LVMClvm:
• Provides volume management of cluster storage.
• A cluster-wide version of LVM2
• CLVM provides the same capabilities as LVM2 on a single node, but
makes the logical volumes created with CLVM available to all nodes
in a cluster.
• CLVM uses the lock-management service provided by the cluster
infrastructure.
• Using CLVM requires minor changes to /etc/lvm/lvm.conf for cluster
wide locking.
clvmd:
• – A daemon that provides clustering extensions to the standard
LVM2 tool
• set and allows LVM2 commands to manage shared storage.
• – Runs on each cluster node.
• – Distributes LVM metadata updates in a cluster, thereby presenting
each cluster node with the same view of the logical volumes

14. GFS – Global File system Overview
Pictorial Representation of GFS cluster

15. GFS- Global File System
• The Red Hat GFS file system is a native file system that interfaces
directly with the Linux kernel file system interface (VFS layer). A GFS file
system can be implemented in a standalone system or as part of a
cluster configuration. When implemented as a cluster file system, GFS
employs distributed metadata and multiple journals.
• A GFS file system can be created on an LVM logical volume. A logical
volume is an aggregation of underlying block devices that appears as a
single logical device
• GFS is based on a 64-bit architecture, which can theoretically
accommodate an 8 EB file system. However, the current supported
maximum size of a GFS file system is 25 TB.
• GFS supports up to 125 GFS nodes.