In this guide, I'll be installing `mod_pagespeed` on a 64-bit CentOS 5.5
system. The host is `example.com`.
Installation
------------
Grab [the most appropriate RPM](http://code.google.com/speed/page-speed/download.html)
and install it.
rpm -ivh https://dl-ssl.google.com/dl/linux/direct/mod-pagespeed-beta_current_x86_64.rpm
This is the RPM manifest on a 64-bit system:
/etc/cron.daily/mod-pagespeed
/etc/httpd/conf.d/pagespeed.conf
/usr/lib64/httpd/modules/mod_pagespeed.so
/var/www/mod_pagespeed/cache
/var/www/mod_pagespeed/files
Testing
-------
To check for a proper install, you can do two things:
* Check if the `/var/www/mod_pagespeed` directories are populated, or
* Use `curl` or `wget` to check for the appropriate header.
### Checking headers
Let's use `wget`:
wget -O - --server-response http://example.com/home/index.php > /dev/null
Here's the response:
--2011-01-05 09:01:36-- http://example.com/home/index.php
Resolving example.com... 128.255.22.132
Connecting to example.com|128.255.22.132|:80... connected.
HTTP request sent, awaiting response...
HTTP/1.1 200 OK
Date: Wed, 05 Jan 2011 15:01:36 GMT
Server: Apache/2.2.3 (CentOS)
X-Powered-By: PHP/5.2.10
X-Mod-Pagespeed: 0.9.11.5-293
Vary: Accept-Encoding
Content-Length: 4657
Connection: close
Content-Type: text/html; charset=UTF-8
Length: 4657 (4.5K) [text/html]
Saving to: `STDOUT'
100%[========================================>] 4,657 --.-K/s in 0s
2011-01-05 09:01:36 (211 MB/s) - `-' saved [4657/4657]
The `X-Mod-Pagespeed` header should tell you that pagespeed is in
action.
Tweaking Pagespeed
------------------
Pagespeed has 18 'filters' with which you can tweak for performance. For
example, I can remove all HTML comments with this filter in
`/etc/httpd/conf.d/pagespeed.conf`
ModPagespeedEnableFilters remove_comments
To see a "before-and-after", append `?ModPagespeed=off` to any page
served up. [This page](http://www.modpagespeed.com/) does a good job of
explaining other filters. You can also check the documentation.
### Viewing statistics
The `/etc/httpd/conf.d/pagespeed.conf` config defines
`/mod_pagespeed_statistics` as a page where you can take a look at
pagspeed's statistics.
Sources
-------
* [Installing mod\_pagespeed on CentOS (cPanel/WHM)](https://fusi0n.org/linux/installing-googles-mod_pagespeed-on-centos-with-cpanel-and-whm)