Download e-book for iPad: CentOS High Availability by Mitja Resman

By Mitja Resman

ISBN-10: 1785285327

ISBN-13: 9781785285325

The excessive functionality and balance of CentOS Linux are the major components that make CentOS Linux definitely the right Linux distribution to construct excessive availability options on. This ebook introduces you to excessive availability ahead of in short jogging you thru the cluster stack and its layers. The booklet is then divided into elements, half A and half B, according to CentOS models 6 and seven respectively. every one half starts with the set up and configuration of the Corosync cluster messaging software program with CMAN or with the Pacemaker cluster source administration software.

You can be brought to cluster carrier configuration and cluster provider administration earlier than you configure fencing or STONITH on CentOS 6 and CentOS 7. through the top of this ebook, you might have the talents required to independently layout, enforce, and continue a CentOS excessive availability multinode cluster environment.

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The cluster nodes must be configured to communicate via an IP address and also the Fully Qualified Domain Name (FQDN) domain names, which requires proper configuration of DNS servers. It is also highly recommended to configure NTP date and time synchronization for all the cluster nodes. In this way, you can be sure that all the cluster members are synchronized to the same NTP servers and are therefore sharing the same date and time settings. It is known to be good practice that the DNS and NTP servers are in the same local network area as the cluster nodes, thus reducing the possibility of network failure causing problems in the DNS resolution or NTP synchronization.

Metadata metadata file. [ 44 ] Chapter 4 The syntax used to define an Apache web server cluster resource is as follows: We can configure a simple Apache web server cluster resource by adding the following line to the CMAN configuration file: The name parameter is the unique name provided for the apache cluster resource. The server_root option provides the Apache installation location.

The services and applications the cluster resource manager provides are called cluster resources. These resources can be anything such as an IP address, web server, database server, or any other application available on the operating system. The cluster resource manager is required to manage and, more importantly, monitor the cluster resources. This is achievable through specific cluster resource agents provided by the cluster resource manager or also through so-called Linux init scripts—start and stop scripts provided by the applications.

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CentOS High Availability by Mitja Resman

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