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CentOS High Availability

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CentOS High Availability

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CentOS High Availability
Apr, 2015 | 174 pages
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Table of Contents (21 chapters)
CentOS High Availability
CentOS High Availability
Credits
Credits
About the Author
About the Author
About the Reviewers
About the Reviewers
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
Getting Started with High Availability
Getting Started with High Availability
What is high availability?
System design
Computer clusters
High-availability solutions
Summary
2
Meet the Cluster Stack on CentOS
Meet the Cluster Stack on CentOS
Cluster stack software
The cluster communication layer
The cluster resource management layer
A theoretical cluster service example
Cluster stack on CentOS Linux
Preparing for cluster stack software installation
Summary
3
Cluster Stack Software on CentOS 6
Cluster Stack Software on CentOS 6
Cluster infrastructure
Cluster operating system preparation
Installing and configuring Corosync
Installing and configuring CMAN
Summary
4
Resource Manager on CentOS 6
Resource Manager on CentOS 6
Working with RGManager
Configuring failover domains
Adding cluster resources and services
Managing cluster services
Removing cluster resources and services
Summary
5
Playing with Cluster Nodes on CentOS 6
Playing with Cluster Nodes on CentOS 6
Adding a new cluster node
Removing a cluster node
Summary
6
Fencing on CentOS 6
Fencing on CentOS 6
Fencing
Fencing configuration
IPMI management board fencing
HP iLO management board fencing
Fencing test
Summary
7
Testing Failover on CentOS 6
Testing Failover on CentOS 6
Hardware failure
Network failure
Summary
8
Two-node Cluster Considerations on CentOS 6
Two-node Cluster Considerations on CentOS 6
Quorum in a two-node cluster
Two-node cluster configuration
Quorum disk
Summary
9
Cluster Stack Software on CentOS 7
Cluster Stack Software on CentOS 7
Cluster infrastructure
Installing and configuring Corosync
Summary
10
Resource Manager on CentOS 7
Resource Manager on CentOS 7
Working with pcs
Adding cluster resources, constraints, and resource groups
Managing resources
Removing cluster constraints, resource groups, and resources
Summary
11
Playing with Cluster Nodes on CentOS 7
Playing with Cluster Nodes on CentOS 7
Adding a new cluster node
Cluster node standby mode
Removing a cluster node
Summary
12
STONITH on CentOS 7
STONITH on CentOS 7
Fencing
Configuring fence devices
IPMI management board fencing
HP iLO management board fencing
Fence test
Summary
13
Testing Failover on CentOS 7
Testing Failover on CentOS 7
Hardware failure
Network failure
Summary
14
Two-node Cluster Considerations on CentOS 7
Two-node Cluster Considerations on CentOS 7
Quorum in a two-node cluster
Two-node cluster configuration
Summary
Index
Index

Adding a new cluster node

Adding a new cluster node to an existing cluster configuration does not require any cluster service downtime. By this point, you should be familiar with the process of installing and configuring cluster stack software on a new CentOS 6 cluster node, so the steps for adding a new cluster node are not covered in detail.

To add a new cluster node to the existing cluster configuration, follow these steps:

  1. Operating system preparation:

    • Configure network interfaces and networking

    • Configure NTP time synchronization

    • Configure DNS resolving

    • Check the network connectivity between the cluster nodes

    Note

    For a detailed procedure on operating system preparation on CentOS 6, refer to Chapter 3, Cluster Stack Software on CentOS 6.

  2. Install and configure Corosync:

    • Install Corosync on the new cluster node and configure iptables rules to allow Corosync cluster communication.

    • Transfer the corosync.conf configuration file and the authkey authentication key from one of the preexisting cluster nodes...

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