Using HP Serviceguard for Linux to Provide High Availability for LAMP, December 2005

High availability for Separate LAMP configuration

Figure 2: Apache and MySQL running as separate packages in a Separate LAMP configuration

In this configuration, the MySQL database and Apache Web server (with PHP) can run

on separate machines. Failure of one application or node results in a restart of only that

application on its adoptive node.

Here Apache and MySQL would run as separate Serviceguard packages. This would

mean that with this configuration in a production environment, one can do rolling

upgrades of the database or web server independently. This configuration offers more

flexibility.

Configuring LAMP for high availability

This section details the procedure for deploying the LAMP stack in a high availability

environment. The setup described below makes a few assumptions. It assumes that

Serviceguard for Linux is installed on all the nodes of the cluster and that both Apache

and MySQL as well as their toolkit binaries are installed on all target nodes.

Separate LAMP configuration

Apache and MySQL in this configuration will run as separate Serviceguard for Linux

packages. Both Apache and MySQL will have a separate set of package configuration

and package control files.

Please follow the instructions in the Apache and MySQL toolkit READMEs and the steps

listed in the section “Additional Configuration Steps” to install and configure Apache and

MySQL as separate Serviceguard for Linux packages. In addition, the procedures

described in the sections “SELinux Considerations” and “Toolkit Script Modifications” of

this whitepaper must be completed before the packages can be run.

The PHP pages served by the Apache web server reside in Apache’s Document Root

directory. If the Document Root is local then synchronization across servers should be

maintained by replicating the PHP files on all target nodes. In case of a shared Document

root, synchronization across servers is automatically taken care of.

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MySQL data