Ruby on Rails + PostgreSQL app fails to start on AWS EC2. Error is: "cannot load such file -- pg_ext (LoadError)"

Question

I began by installing all these dependencies:

sudo yum install ruby19 ruby19-devel gem rubygems19-devel make gcc postgresql9 postgresql9-devel postgresql9-server

Then I switch to the root user and I run

bundle install

and I get the green success message:

Your bundle is complete! Use `bundle show [gemname]` to see where a bundled gem is installed.

However, when I cd to the dir and run

rails s -p80

it I get all this and it fails to start (I'm still root because bind won't work to port 80 if I'm not root):

/usr/local/share/gems/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in `require': cannot load such file -- pg_ext (LoadError)
    from /usr/local/share/gems/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in `block in require'
    from /usr/local/share/gems/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:236:in `load_dependency'
    from /usr/local/share/gems/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in `require'
    from /usr/local/share/gems/gems/pg-0.14.0/lib/pg.rb:4:in `<top (required)>'
    from /usr/local/share/gems/gems/bundler-1.2.0/lib/bundler/runtime.rb:68:in `require'
    from /usr/local/share/gems/gems/bundler-1.2.0/lib/bundler/runtime.rb:68:in `block (2 levels) in require'
    from /usr/local/share/gems/gems/bundler-1.2.0/lib/bundler/runtime.rb:66:in `each'
    from /usr/local/share/gems/gems/bundler-1.2.0/lib/bundler/runtime.rb:66:in `block in require'
    from /usr/local/share/gems/gems/bundler-1.2.0/lib/bundler/runtime.rb:55:in `each'
    from /usr/local/share/gems/gems/bundler-1.2.0/lib/bundler/runtime.rb:55:in `require'
    from /usr/local/share/gems/gems/bundler-1.2.0/lib/bundler.rb:128:in `require'
    from /home/user/TransForm/config/application.rb:7:in `<top (required)>'
    from /usr/local/share/gems/gems/railties-3.2.8/lib/rails/commands.rb:53:in `require'
    from /usr/local/share/gems/gems/railties-3.2.8/lib/rails/commands.rb:53:in `block in <top (required)>'
    from /usr/local/share/gems/gems/railties-3.2.8/lib/rails/commands.rb:50:in `tap'
    from /usr/local/share/gems/gems/railties-3.2.8/lib/rails/commands.rb:50:in `<top (required)>'
    from script/rails:6:in `require'
    from script/rails:6:in `<main>'

Perhaps there is an easy way to just deploy it correctly from the begining instead of messing around with error craps? I need PostgreSQL. This app works everywhere except this AWS EC2 instance, so I know my Gemfile is correct. Any clues would help.

I've got almost the exact same problem. :(

Aaron Fi
– Aaron Fi

2012-09-19 06:11:58 +00:00
Commented Sep 19, 2012 at 6:11 — Aaron Fi
– Aaron Fi, Commented Sep 19, 2012 at 6:11

CuriousMind · Accepted Answer · 2012-09-20 02:43:17Z

1

open irb & type require "pg" does it work? if not, then check that pg_ext exists in /usr/local/share/gems/gems/pg-0.14.0/lib/ directory. you can install manually postgresql gem manually, using

gem install pg

If this still doesn't work, ensure that you are using latest version of ruby & latest version of rubygems using gem environment command.if its the older version, you can install latest ones using rvm

answered Sep 20, 2012 at 2:43

CuriousMind

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Mukesh · Accepted Answer · 2014-09-19 09:39:45Z

0

        use gem pg 
            than 
             bundle install
             bundle update
               please not use any version of pg 
       I face this error and solved by this

answered Sep 19, 2014 at 9:39

Mukesh

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1 Comment

Marcus Rickert Over a year ago

I assume that this is a valid answer. Try to rephrase and reformat it to make it more understandable.

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