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POIs it a good idea to use a different gemset for staging and production environments?
 

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  1. POIs it a good idea to use a different gemset for staging and production environments?
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    <p>I have the idea to configure my app to use a different gemset for staging and production. My thought process is that by splitting the environments into separate gemsets, I'd have more freedom down the line when/if I need to update gems/ruby/rails. I'd be able to make that change, and test the whole thing out on staging without disturbing the production app/gemset.</p> <p>To accomplish this, I would have two files on the server, one in each environment's shared directory, named rvmrc. This contains <code>rvm use ree-1.8.7-2012.02@appname-production --create</code> for production and <code>rvm use ree-1.8.7-2012.02@appname-staging --create</code> for staging.</p> <p>I would include a task in the deploy script to link the corresponding <code>shared/rvmrc</code> file into the app as <code>.rvmrc</code>:</p> <pre><code>namespace :deploy do task :rvmrc do run "rm #{latest_release}/.rvmrc; ln -s #{shared_path}/rvmrc #{latest_release}/.rvmrc" end end before "bundle:install", "deploy:rvmrc" </code></pre> <p>Is this actually a good idea, or am I over-complicating things?</p>
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    1. USJames Chevalier
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    1. COTypically your staging is going to be running on a different server than your production, so I am not sure if you get much benefit from using a different gemset? Also I am pretty sure 'bundler/capistrano' will install all of the gems to shared/bundle under the install directory, your install directories would need to be different if running staging and production on the same machine, so I think you get gem isolation by default?
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      1. UShouse9
    2. COTrue, separate servers might actually make this part a bit easier for me, but this app's use of staging is so lightweight that I can run both apps on the same server. You're right about the `shared/bundle` directory, too. I hadn't noticed that. I wonder what the 'GEM_PATH' environment variable is, then. I ran a script that just does `puts ENV['GEM_PATH']`, and it reported `/usr/local/rvm/gems/ree-1.8.7-2012.02@appname-staging:/usr/local/rvm/gems/ree-1.8.7-2012.02@global`. Maybe bundler alone uses `GEM_PATH`, but 'bundler/capistrano' uses the `shared/bundle` directory (?).
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      1. USJames Chevalier
    3. COi am assuming you have different Gemfiles between production and staging right now? `cd staging_dir; bundle list` and `cd production_dir; bundle list` - now just make sure everything you do uses `bundle exec` when running from either staging or production, rake tasks, boot your server (passenger, unicorn, thin etc...)
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