Redirect to www.domain.com with Nginx

July 13th, 2008 — Linux, Nginx

Depending on your requirements you’ll need to redirect your users from domain.com to www.domain.com with a permanent redirect in order to improve your site SEO ranking. We already know how to do it with apache and mod_rewrite, but how do you make it in nginx ? It’s not too hard.

Apache configuration:

#.htaccess
RewriteEngine On
RewriteCond %{HTTP_HOST} !^www\.domain\.com
RewriteRule (.*) http://www.domain.com$1 [R=301,L]

Nginx configuration:

# /etc/nginx/nginx.conf
if ($http_host !~ "^www\.domain\.com$") {
    rewrite  ^(.*)    http://www.domain.com$1 permanent;
}

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Spawning FastCGI php process with custom php.ini file

July 12th, 2008 — Linux

You can specify custom php.ini file with spawn-fcgi using this format:

/usr/bin/spawn-fcgi [options] -- /usr/bin/php-cgi \
  -c /etc/php-fastcgi.ini

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Install RubyGems on CentOS 4

July 11th, 2008 — Linux, Ruby

This post will explain how to install RubyGems 1.2 on the server running CentOS 4.

Following instructions from the install section of the RubyGems User Guide:

http://www.rubygems.org/read/chapter/3

[root@monster tmp]# yum -y install ruby ruby-devel irb
...
[root@monster tmp]# wget http://rubyforge.org/frs/download.php/38646/rubygems-1.2.0.tgz
...
[root@monster tmp]# tar xvfzp rubygems-1.2.0.tgz
...
[root@monster tmp]# cd rubygems-1.2.0
[root@monster rubygems-1.2.0]# ruby setup.rb 
Expected Ruby version > 1.8.3, was 1.8.1

Oops, we’ll need a newer version of ruby, by default CentOS 4 comes with ruby 1.8.1 . To install a newer version of ruby we’ll subscribe to testing repository from CentOS. To do this we’ll create a repo file called CentOS-Testing.repo in /etc/yum.repos.d directory:

CentOS-Testing.repo content

# /etc/yum.repos.d/CentOS-Testing.repo
# packages in testing repository
[testing]
name=CentOS-$releasever - Testing
baseurl=http://dev.centos.org/centos/$releasever/testing/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://dev.centos.org/centos/RPM-GPG-KEY-CentOS-testing

Note the line with enabled=0, we’ll enable the repository only when needed. Install ruby from the testing repository:

[root@monster ~]# yum --enablerepo=testing install ruby ruby-devel ruby-libs ruby-irb ruby-rdoc 
Loading "fastestmirror" plugin
Setting up Install Process
Setting up repositories
Loading mirror speeds from cached hostfile
Reading repository metadata in from local files
Parsing package install arguments
Resolving Dependencies
...
Dependencies Resolved
 
=============================================================================
 Package                 Arch       Version          Repository        Size 
=============================================================================
Installing:
 ruby-irb                i386       1.8.5-5.el4.centos.1  testing            67 k
 ruby-rdoc               i386       1.8.5-5.el4.centos.1  testing           132 k
Updating:
 ruby                    i386       1.8.5-5.el4.centos.1  testing           272 k
 ruby-devel              i386       1.8.5-5.el4.centos.1  testing           503 k
 ruby-libs               i386       1.8.5-5.el4.centos.1  testing           1.5 M
 
Transaction Summary
=============================================================================
Install      2 Package(s)         
Update       3 Package(s)         
Remove       0 Package(s)         
Total download size: 2.5 M
Is this ok [y/N]: y
Downloading Packages:
(1/5): ruby-rdoc-1.8.5-5. 100% |=========================| 132 kB    00:02     
(2/5): ruby-libs-1.8.5-5. 100% |=========================| 1.5 MB    00:14     
(3/5): ruby-devel-1.8.5-5 100% |=========================| 503 kB    00:04     
(4/5): ruby-1.8.5-5.el4.c 100% |=========================| 272 kB    00:03     
(5/5): ruby-irb-1.8.5-5.e 100% |=========================|  67 kB    00:01     
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
  Updating  : ruby-libs                    ######################### [1/9] 
  Updating  : ruby                         ######################### [2/9] 
  Installing: ruby-irb                     ######################### [3/9] 
  Installing: ruby-rdoc                    ######################### [4/9] 
  Updating  : ruby-devel                   ######################### [5/9] 
  Cleanup   : ruby-libs                    ######################### [6/9]
  Cleanup   : ruby-devel                   ######################### [7/9]
  Cleanup   : ruby                         ######################### [8/9]
  Removing  : irb                          ######################### [9/9]
 
Installed: ruby-irb.i386 0:1.8.5-5.el4.centos.1 ruby-rdoc.i386 0:1.8.5-5.el4.centos.1
Updated: ruby.i386 0:1.8.5-5.el4.centos.1 ruby-devel.i386 0:1.8.5-5.el4.centos.1 ruby-libs.i386 0:1.8.5-5.el4.centos.1
Complete!

Now it’s better, we do have ruby 1.8.5 installed on the system. Let’s return to RubyGems install:

[root@monster rubygems-1.2.0]# ruby setup.rb
...
------------------------------------------------------------------------------
 
RubyGems installed the following executables:
        /usr/bin/gem
 
If `gem` was installed by a previous RubyGems installation, you may need
to remove it by hand.

Voila! We have installed RubyGems 1.2 on the CentOS 4 server.

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