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

A sample hahttp.conf file and hamysql.conf changes for the above example is shown

below. For a complete description of all variables listed in the hahttp.conf and

hamysql.conf files and their sample values, please refer to the respective toolkit README

files.

hahttp.conf

SERVER_ROOT="/etc/httpd"

PID_FILE="/var/run/httpd.pid"

HTTP_SERVICE_NAME="http.monitor"

HTTP_SERVICE_CMD="/usr/local/cmcluster/conf/http_pkg/hahttp.mon"

HTTP_SERVICE_RESTART="-r 0"

The HTTP_SERVICE_NAME entry must be the same as the SERVICE_NAME used in the

package configuration file.

hamysql.conf

CONFIGURATION_FILE_PATH="/MySQL_1/my.cnf"

PID_FILE="/var/run/mysqld/mysqld.pid"

Now, copy the package directories to all nodes in the cluster running the respective

packages. All the planned nodes should have identical file paths for all package files.

Apply the Serviceguard for Linux package configuration using the “cmapplyconf”

command with the “ P” flag.

# cmapplyconf –P lamp_single_pkg.config (After the cluster is configured)

In addition to all the preceding steps edit the Apache (httpd.conf) and MySQL (my.cnf)

configuration files according to your particular setup. Follow the instructions in the toolkit

README’s for editing these files. In the Apache toolkit README these instructions are

listed under the section “Setting up the Apache Web Server”. The MySQL toolkit

README lists these instructions under the section “Setting up MySQL with the Toolkit”.

This is further explained under the section Additional configurations. After this step is

completed and the SELinux Considerations are taken care of, the package would be

ready to run.

Additional configuration steps

In addition to the steps mentioned above there are a few more steps that have to be

completed before the packages can be run. These steps are explained in this section and

apply to either case.

The files Apache configuration file “httpd.conf” which exists in the Apache Server Root

directory and MySQL configuration file “my.cnf” need to be edited in accordance to the

shared configuration of the user’s setup. For the example LAMP configuration described

above httpd.conf and my.cnf can have the following entries. Since the Apache Server

Root directory is local in the example configuration, the file httpd.conf must be replicated

across servers.

httpd.conf

ServerRoot "/etc/httpd"

PidFile run/httpd.pid