One step deployment of rails applications with git and passenger

I developed this pattern with mercurial, and have recently adapted it to work with git

Assumed

  • You want your production application to be deployed at /data/site/myrailssite on your remote system
  • You are running passenger for your rails applications (if you aren’t you should really take a look)

Setting up the production target

First, create a rails user on your production system.  This lets your rails app run under a different id than you, or your webserver.  Privilege isolation is a good thing.

Next, mkdir /data/site/myrailssite and chown rails /data/site/myrailssite.

Next, su – rails, and cd /data/site/myrailssite && git init

Next, chmod 755 .git/hooks/post-receive

And finally add the following lines to .git/hooks/post-receive.

export RAILS_ENV=production

DIR=`pwd | sed s/.git$//`

cd $DIR && git –git-dir=$DIR/.git –work-tree=$DIR reset –hard && rake db:migrate && touch tmp/restart.txt

Setting your source repo to push to production

On your source repository git remote add production ssh://rails@yourhostname/data/site/myrailssite.

Then, finally git push production master, and you are off.  On any future change the push to production will roll the git tree to the newest revision on master, kick off the migrations, and trigger a passenger restart.  This is a really handy pattern for making life really easy for deployment, and I’m rolling this through all my project sites as I slowly convert them from mercurial to git.

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