From HiPBX Wiki

Contents 1 Clustering 1.1 List of Clustered Services 2 DHCP Service 3 MySQL Database 4 Asterisk VoIP Server 5 Apache/FreePBX 6 Spare service

Clustering

HiPBX uses the Linux-HA recommended and supplied Clustering services. This is built from two major components:

• Corosync - The cluster communications engine
• Pacemaker - The cluster resource manager.

The major sub-item is DRBD, which acts as a RAID-1 disk mirror, but between different machines.

List of Clustered Services

• DHCP
• MySQL
• Asterisk
• FreePBX or Apache
• Spare - a spare resource for utilization by the end user

No documentation for this service at the moment.

There are no changes to MySQL in HiPBX. As part of the installer, the first machine you install HiPBX on becomes authoritative for any existing database on the machine. The data, if any, is moved to the new filesystem, at a temporary mount point of /drbd/mysql. After the data move is complete, it is then remounted under /var/lib/mysql, which is the default location in CentOS for MySQL databases. This filesystem is then replicated with DRBD between both machines.

All of the Asterisk data is stored under /drbd/asterisk , and is symlinked from its origin. These specific symlinks are:

Original	Destination	Description
/etc/amportal.conf	/drbd/asterisk/amportal.conf	FreePBX Configuration file (sh/bash)
/etc/freepbx.conf	/drbd/asterisk/freepbx.conf	FreePBX Configuration file (php)
/etc/asterisk/	/drbd/asterisk/etc	Main Asterisk directory
/etc/dahdi/	/drbd/asterisk/dahdi	Main DAHDI Directory
/var/lib/asterisk/	/drbd/asterisk/lib	Various Asterisk and FreePBX binaries
/var/log/asterisk/	/drbd/asterisk/log	All Asterisk Logfiles
/usr/lib64/asterisk/modules/	/drbd/asterisk/modules	Asterisk loadable modules
/usr/share/asterisk/	/drbd/asterisk/share	Sound files, provisioning, etc
/var/spool/asterisk/	/drbd/asterisk/spool	Voicemail, Recordings, astdb

All of the Apache configuration and data is stored under /drbd/httpd, and is symlinked from its origin. These specific symlinks are:

Original	Destination	Description
/var/www/	/drbd/httpd/www	All web pages and FreePBX pages
/var/log/httpd/	/drbd/http/logs	Apache logs
/etc/php.d/	/drbd/http/php	PHP modules and configuration
/etc/php.ini	/drbd/http/php.ini	PHP Configuration file

This service is specifically left unconfigured, but disk space and an IP Address is allocated, and a cluster group is created. If you need an extra high-av service, this resource can be added to and configured using CRM.