Installing, switch and manage Rails2 and Rails3 on Centos 5-6

Before the installation of Rubies on Rails we need
to Prepare our system by installing some prerequisite’s stuff.
All work is supposed to be make by a ordinary $ user…

1. Install Prerequisite stuff

   sudo yum install sqlite-devel

   Prepare for git installation:

   sudo yum install zlib-devel openssl-devel perl cpio expat-devel gettext-devel

   If you haven’t Curl installed follow this:

   wget http://curl.haxx.se/download/curl-7.18.0.tar.gz

   tar xzvf curl-7.18.0.tar.gz

   cd curl-7.18.0

   ./configure

   make

   sudo make install

   Next you need to put a reference of /usr/local/lib on your
   ld.so.conf because Git has to know your Curl’s version…

   sudo nano /etc/ld.so.conf

   Insert the line below:

   /usr/local/lib

   Save your file and then execute:

   sudo /sbin/ldconfig

   Now you can finnaly proceed to set the right repository for the following tasks and to install git:

   sudo rpm -Uvh http://download.fedora.redhat.com/pub/epel/5/x8664/epel-release-latest-5-4.noarch.rpm 

   sudo yum install git

2. Install of rvm

   bash < <( curl -k https://rvm.beginrescueend.com/releases/rvm-install-head )

   Next you need to put the path of rvm in terminal and in your .profile

   source $HOME/.rvm/scripts/rvm

   echo '[[ -s "$HOME/.rvm/scripts/rvm" ]] && source "$HOME/.rvm/scripts/rvm"' >> $HOME/.profile

   Now you provide to close re-open your terminal window or to open a new tab and check that rvm has been correctly installed

   rvm -v

   Next you provide to look for post-installation requirements executing:

   rvm notes

   You should find marked a list of post-install tasks like:
   $ yum install -y gcc-c++ patch readline readline-devel zlib zlib-devel libyaml-devel libffi-devel openssl-devel
   Now you can proceed to add this stuff:

   sudo yum install -y gcc-c++ patch readline-devel zlib-devel libyaml-devel libffi-devel openssl-devel

   After you have accomplished your post-install tasks you are now ready to begin using rvm to install Rubies on Rails :)  

3. Install of Ruby 1.8.7 and Rails 2.3.8

   Use rvm to install ruby 1.8.7 by:

   rvm install 1.8.7

   We select by rvm to use ruby 1.8.7:

   rvm use 1.8.7

   (If your work is almost of time based on Rails2 you can provide to add the option --default) Now you can check your ruby version by

   ruby -v

   Need result --> ruby 1.8.7... After that we will provide to install Rails 2.3.8. Install Rails 2.3.8:

   rvm gem install -v=2.3.8 rails

   Now there will need a little correction of our gem's version if rvm provide to install a set than isn't good for our Rails version... Download, untar and install rubygems 1.5.0:

   wget http://rubyforge.org/frs/download.php/74140/rubygems-1.5.0.tgz

   Untar it:

   tar zxvf rubygems-1.5.0.tgz

   Install it:

   cd rubygems-1.5.0

   ruby setup.rb

   Now check your gem version by:

   gem -v

   Will give you a result of 1.5.0 You can now test than your Rails2 is effectively working by looking than

   rails test

   will generate a rails scheme.

4. Install of Ruby 1.9.2 and Rails 3
    

   rvm install 1.9.2

   rvm use --default 1.9.2

   ruby -v

   Need result --> ruby 1.9.2...

   rvm gem install --pre rails

   rails -v

   Need result --> rails > 3 Finally, provide to test your Rails3 is effectively working

   rails new ./testrails3

   Will give you a default application.

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Tags: CentOS, Command line, Console, Install, Linux, Rails, Shell, Terminal