How to Install Rails on CentOS 7

Install prerequisite dependencies

$ sudo yum install -y git-core zlib zlib-devel gcc-c++ patch readline readline-devel libyaml-devel libffi-devel openssl-devel make bzip2 autoconf automake libtool bison curl sqlite-devel

Install rbenv

$ git clone https://github.com/rbenv/rbenv.git ~/.rbenv
$ cd ~/.rbenv && src/configure && make -C src
$ echo 'export PATH=$HOME/.rbenv/bin:$PATH' >> ~/.bash_profile

Run rbenv init, and follow the instructions.

$ rbenv init
# Load rbenv automatically by appending
# the following to ~/.bash_profile:

eval "$(rbenv init -)"

Restart your shell.

Install ruby-build plugin to get access to rbenv install.

$ git clone https://github.com/rbenv/ruby-build.git ~/.rbenv/plugins/ruby-build

Finally, install ruby, and confirm version.

$ rbenv install 2.2.2
...
$ ruby -v
ruby 2.2.2p95 (2015-04-13 revision 50295) [x86_64-linux]

Confirm sqlite3 is installed

$ sqlite3 --version
3.7.17 2013-05-20 00:56:22 118a3b35693b134d56ebd780123b7fd6f1497668

Install rails using gem.
NOTE: I originally had some trouble running this command because the version of ruby kept going back to 2.0.0, which is the default version for my installation of CentOS. I had to manually add a .ruby-version file into my working directory with the contents 2.2.2 in order for the gem command to proceed with the rails installation. I don’t know if this is the correct way of doing this.

$ gem install rails
...
$ rails --version
Rails 5.0.0.1

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