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Contents 1 Install Ruby from Repos 2 Install Ruby from Source 3 Install Rubygems 4 Install Rails 5 Install SQLite 6 Installing MySQL 7 Install OpenSSL 8 Install thin

This article will cover setting up Ruby on Rails, running with the "thin" server and proxied by Nginx

At the moment, it's more commands than discussion, but that can be edited later.

Install Ruby from Repos

Unfortunately, CentOS doesn't include recent ruby packages. For some applications, an older version of Ruby will work, in which case install from repos (this). Otherwise, you'll need to skip to the next section, Install Ruby from Source.

Installing ruby from the repo is as straight forward as running yum:

$ yum install ruby ruby-devel ruby-libs ruby-irb ruby-rdoc

Verify the ruby version

$ ruby -v
ruby 1.8.5 (2006-08-25) [x86_64-linux]

Install Ruby from Source

If you need a more recent version of Ruby, you'll need to install from source.

$ yum groupinstall 'Development Tools'
$ yum install readline-devel
$ cd ~
$ mkdir ./src
$ cd ./src
$ wget ftp://ftp.ruby-lang.org/pub/ruby/1.9/ruby-1.9.1-p376.tar.gz
$ tar xzvf ruby-1.9.1-p376.tar.gz
$ cd ruby-1.9.1-p376
$ ./configure && make
$ make install

Link to ruby install into /usr/bin

$ ln -s /usr/local/bin/ruby /usr/bin/ruby

And test out the version

$ ruby -v
ruby 1.9.1p376 (2009-12-07 revision 26041) [x86_64-linux]

Install Rubygems

Unfortunately, CentOS doesn't currently have recent rubygems in the repos, so we'll need to install it from source.

Start by creating a source folder:

$ cd ~
$ mkdir ./src
$ cd ./src

Download the most recent version of rubygems. Make sure to replace 1.3.6 with the current version from the rubygems page.

$ wget http://rubyforge.org/frs/download.php/69365/rubygems-1.3.6.tgz

Extract the source, and visit the new rubygems source directory:

$ tar xzvf rubygems-1.3.6.tgz
$ cd rubygems-1.3.6

• Tip you can type cd ruby<TAB>, and the shell will complete the folder name for you.

$ ruby setup.rb

Once rubygems is installed, you can update by running

$ gem update

although it's just been installed, so nothing should be out of date yet.

• Tip: If running the `update` command produces an error, try running `yum groupinstall 'Developemnt Libraries'` and then going back into the ruby folder, running `make clean` and then restarting the install from the `./configure` step (including re-running `ruby setup.rb`).

Install Rails

Rails is easy -- really easy

$ gem install rails

Check the install with

$ gem list

*** LOCAL GEMS ***

actionmailer (2.3.5)
actionpack (2.3.5)
activerecord (2.3.5)
activeresource (2.3.5)
activesupport (2.3.5)
rack (1.0.1)
rails (2.3.5)
rake (0.8.7)

Install SQLite

Rails likes some SQLite. So, first make sure that it's installed on the system

$ yum install sqlite sqlite-devel

Then install the SQLite rubygem

$ gem install sqlite3-ruby

Finally, test it out to make sure that ruby sees SQLite

$ irb
irb(main):001:0> require 'sqlite3'
=> true

Installing MySQL

Get MySQL installed (TODO: Article on MySQL?)

$ gem install mysql -- --with-mysql-config=/usr/lib64/mysql/mysql_config

And that's it

Install OpenSSL

In order to use Ruby on the web, we will need OpenSSL support. Start by installing OpenSSL

$ yum install openssl openssl-devel

Then, build open ssl support into ruby

$ cd ~
$ cd ./src/ruby-1.9.1-p376/ext/openssl
$ ruby extconf.rb
$ make
$ make install

Finally, check to make sure that ruby has OpenSSL support

$ irb
irb(main):001:0> require 'openssl'
=> true

Install thin

After all that setup, installing thin is actually pretty easy

$ gem install thin

To check that thin is properly installed, check the version

$ thin -v
thin 1.2.7 codename No Hup

__Note:__ If thin fails with a message about ssl, see the previous section, Installing OpenSSL.