Tuesday, April 10, 2007

Deployment Using Apache 2.2.4

Couple of weeks ago I found a new respect for Apache. I was installing a new VPS and I needed to deploy ruby on rails applications, Java applications and PHP side by side. As the site is for mostly internal use, the traffic was originally quite low, but due to some problems with one of my other hosting providers I was forced to move there some of our external applications with considerably higher traffic. As soon as the traffic grew beyond the resources of this server I realized how easy it was to scale out and instead of moving some of the applications away I was able to retain this server as the main balancer that is sending traffic to servers around.

Here's a simple walk through for installing Apache 2.2.4 on Ubuntu. It's compiled from various sources – they are listed below – of course, they did the tough job :-). I just put everything in one place to provide a complete example.

Prerequisites

As the Apache 2.2.4 is not yet in Ubuntu repositories you will need to do manual installation (i.e. compile from source). Before that you have to make sure that whatever apache installed using apt-get is removed from the system:

sudo dpkg --purge apache apache2

Install the GCC compilers and developer tools:

sudo apt-get install build-essential

Some extra libraries needed for Ruby/Apache to work:

Install zlib:

wget http://www.zlib.net/zlib-1.2.3.tar.gz
tar xvfz zlib-1.2.3.tar.gz
cd zlib-1.2.3/
./configure
make
sudo make install
alternatively you can use:
sudo apt-get install zlib1g zlib1g-dev
Install openssl:
sudo apt-get install openssl libssl-dev
Install Readline:
apt-get install libreadline5 libreadline5-dev

If you haven't done so already install ruby:

sudo apt-get install ruby1.8-dev ruby1.8 ri1.8 rdoc1.8 irb1.8 libreadline-ruby1.8 libruby1.8

ONLY FOR 64-bit processors you will need to use Ruby 1.8.5 or higher to make postresql gem work, which means, you will need to compile it from source. In this case download the latest Ruby source:

wget http://ftp.ruby-lang.org/pub/ruby/1.8/ruby-1.8.6.tar.gz
tar -xzf ruby-1.8.6.tar.gz
cd ruby-1.8.6
./configure
make
sudo make install
Now create a few links to ruby that will be used later (this may or may not be necessary - but no hurt doing it :-):
sudo ln -s /usr/bin/ruby1.8 /usr/local/bin/ruby
sudo ln -s /usr/bin/ri1.8 /usr/local/bin/ri
sudo ln -s /usr/bin/rdoc1.8 /usr/local/bin/rdoc
sudo ln -s /usr/bin/irb1.8 /usr/local/bin/irb
Install readline support for ruby:
cd ext/readline
ruby extconf.rb
make
sudo make install
cd ../../../

Apache Installation

Download and compile Apache 2.2:
wget http://apache.rmplc.co.uk/httpd/httpd-2.2.4.tar.gz
tar -xvf httpd-2.2.4.tar.gz
cd httpd-2.2.4
./configure --prefix=/usr/local/apache --enable-proxy   --enable-proxy-http \
--enable-proxy-balancer --enable-dav --enable-rewrite    --enable-so \
--enable-http   --enable-ssl    --enable-expires  --enable-headers  \
--enable-mods=deflate_module --with-php \
--with-mysql --with-susexec --disable-info  \
--without-berkeley-db --enable-dav=shared \
--enable-dav-lock=shared --with-included-apr
make
sudo make install

ln -s /usr/local/apache/bin/apachectl /usr/sbin/

Apache at start-up

It's a good idea to have Apache start at boot time automatically:

sudo cp /usr/local/apache/bin/apachectl /etc/init.d/apachectl
sudo chmod +x /etc/init.d/apachectl
sudo vim /etc/init.d/apachectl

Add the followinig, so the top of the file looks like:

#!/bin/sh
#
# chkconfig: - 85 15
# description: Apache is a web server.

Now we need to register it with the start-up manager:

sudo /usr/sbin/update-rc.d apachectl defaults

Securing Apache

It's also a good idea to create a dedicate Apache system user account. It'll make your install more secure.

sudo adduser --system apache

To make apache actually use it edit the configuration file:

sudo vim /usr/local/apache/conf/httpd.conf

You need to find the lines that say:

User daemon
Group daemon

And change them so they look like:

User apache
Group nogroup

Install PHP

While you're at it install the PHP as well... You may need to install bison and flex first:

sudo apt-get install bison
sudo apt-get install flex

Download the php from www.php.net. In my case it was PHP4:

wget http://sg.php.net/distributions/php-4.4.6.tar.gz
tar -xzf php-4.4.6.tar.gz
cd php-4.4.6
./configure --with-apxs2=/usr/local/apache/bin/apxs --with-mysql

make
sudo make install

sudo cp php.ini-dist /usr/local/lib/php.ini

Add the following to httpd.conf (sudo vim /usr/local/apache/conf/httpd.conf) - put it somewhere around the other AddType definitions:

AddType application/x-httpd-php .php .phtml

Update line

DirectoryIndex index.html
to
DirectoryIndex index.html index.php

Restart apache and you're done

sudo apachectl restart

Wow! We're done with the first part. Once you're done here you're able to add the actual deployment servers. Here are some of my favorite:

  • Mongrel Cluster to deploy Ruby on Rails applications
  • Tomcat to deploy Java applications

References

1 comment:

  1. Thanks for sharing your info. I really appreciate your efforts and I will be waiting for your further write ups thanks once again.
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