CentOS - installing Apache and PHP5
(from slicehost.com)

CentOS comes with Apache v.2.2.3 and PHP v.5.1.6 and they are easily installed via the default CentOS Package Manager 'yum'.

The advantage of using yum (as opposed to installing via source code) is that you will get any security updates (if and when distributed) and dependencies are automatically taken care of.

Apache Install

A basic Apache install is very easy:

sudo yum install httpd mod_ssl

ServerName

Oddly, the server does not start automatically when you install it so you have to do this by hand:

sudo /etc/init.d/httpd start

The first thing you will see is this error:

Starting httpd: httpd: Could not reliably determine the server's fully qualified domain name,
using xxxxxx for ServerName

The xxxxxx will be your Slice hostname. It's a good idea to set the ServerName for the next time the server is started.

Open the main apache config:

sudo nano /etc/httpd/conf/httpd.conf

Towards the end of the file you will find a section that starts with 'ServerName' and gives the example:

#ServerName www.example.com:80

All you need to do is enter your Slice hostname or a FQDN:

ServerName demo

Note that my Slice hostname is 'demo'.

Reload Apache:

sudo /etc/init.d/httpd reload

Now the warning has gone. Nice.

Default Page

If you navigate to your Slice IP address:

http://123.45.67.890

You will see the default CentOS Apache welcome screen:

I think that's a good start.

PHP5 Install

Let's move on to the PHP5 install. I'm not going to install all the modules available. Just a few common ones so you get the idea.

As before, due to using yum to install PHP5, any dependencies are taken care of:

sudo yum install php-common php-gd php-mcrypt php-memchache php-mhash php-mysql php-xml

Once done, do a quick Apache reload:

sudo /etc/init.d/httpd reload

Done.

Almost

Well, almost done.

We do need to configure Apache for our setup so we can host multiple sites and so on.

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