Apache

Running a redundant apache server does not require much from apache itself, but rather the underlying filesystem and a proxy in front of it. The filesystem is important, so the website and its php sessions can be shared between the servers. For this we will use GlusterFS. The proxy in front of apache will be a combination of HA-proxy and Corosync.

In this setup we will configure 2 apache servers. None of these will be master/slave/primary/secondary. They will just be running with the same configuration. Since the servers are configured the same way it makes sense to share some files.

192.168.1.50 www01
192.168.1.51 www02

Software

apt-get install apache2 php php-mysql

Filesystem

Configure your system as a GlusterFS client, so you have the following in your fstab.

/etc/glusterfs/www.vol /var/www glusterfs defaults,_netdev,rw 0 0

Testpage

Make a simple webpage, that shows something unique about the system. This is usefull when debugging. index.php

   1 <?php
   2         echo "client: " . $_SERVER['REMOTE_ADDR'] . "\n";
   3         echo "server: " . $_SERVER['SERVER_ADDR'] . "\n";
   4         echo "hostname: " . gethostname() . "\n";
   5 ?>

-  ⇤ ← Revision 3 as of 2017-12-24 21:27:10 → 
  Size: 406
  Editor: Kristian Kallenberg
  Comment:
+   ← Revision 24 as of 2018-01-20 22:11:40 → ⇥
  Size: 1336
  Editor: Kristian Kallenberg
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 1:
+incomplete, do not use!
-Line 2:
+Line 3:
+Running a redundant apache server does not require much from apache itself, but rather the underlying filesystem and a proxy in front of it. The filesystem is important, so the website and its php sessions can be shared between the servers. For this we will use [[GlusterFS|GlusterFS]]. The proxy in front of apache will be a combination of [[HA-proxy|HA-proxy]] and [[Corosync|Corosync]].

In this setup we will configure 2 apache servers. None of these will be master/slave/primary/secondary. They will just be running with the same configuration. Since the servers are configured the same way it makes sense to share some files.

 * 192.168.1.50 www01
 * 192.168.1.51 www02
-Line 6:
+Line 14:
-apt-get install apache2
+apt-get install apache2 php php-mysql
-Line 9:
+Line 17:
-=== GlusterFS ===
==== Backup ====
Make a backup of `/var/www`
+== Filesystem ==

Configure your system as a [[GlusterFS Client|GlusterFS client]], so you have the following in your fstab.
-Line 13:
+Line 21:
-cd /var
tar cfvzp www.tar.gz www/
+/etc/glusterfs/www.vol /var/www glusterfs defaults,_netdev,rw 0 0
-Line 17:
+Line 24:
-==== GlusterFS Client ====
Install the glusterfs client and mount the glusterfs volume.

==== Restore ====
Restore the backup
{{{
tar xfvzp www.tar
rm www.tar.gz
+== Testpage ==
Make a simple webpage, that shows something unique about the system. This is usefull when debugging.
`index.php`
{{{#!highlight php
<?php
        echo "client: " . $_SERVER['REMOTE_ADDR'] . "\n";
        echo "server: " . $_SERVER['SERVER_ADDR'] . "\n";
        echo "hostname: " . gethostname() . "\n";
?>
-Line 26:
+Line 34:
-{{{
apt-get install glusterfs-client
}}}