Deploying in Java

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Deploying
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The improved README file formatted with Markdown (full size)
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As mentioned above, it s also possible to abandon your topic branch changes, in this case with git branch -D:
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# $ $ $ $ $ $ For illustration only; don't do this unless you mess up a branch git checkout -b topic-branch <really screw up the branch> git add git commit -a -m "Screwed up" git checkout master git branch -D topic-branch
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Unlike the -d flag, the -D flag will delete the branch even though we haven t merged in the changes
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Push Now that we ve updated the README, we can push the changes up to GitHub to see the result:22
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$ git push
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As promised, GitHub nicely formats the new file using Markdown (Figure 110)
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14 Deploying
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Even at this early stage, we re already going to deploy our (still-empty) Rails application to production This step is optional, but deploying early and often allows us to catch any deployment problems early in our development cycle The alternative deploying
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22 When collaborating on a project with other developers, you should run git pull before this step to pull in any remote changes
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1: From Zero to Deploy
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only after laborious effort sealed away in a development environment often leads to terrible integration headaches when launch time comes23 Deploying Rails applications used to be a pain, but the Rails deployment ecosystem has matured rapidly in the past few years, and now there are several great options These include shared hosts or virtual private servers running Phusion Passenger (a module for the Apache and Nginx24 web servers), full-service deployment companies such as Engine Yard and Rails Machine, and cloud deployment services such as Engine Yard Cloud and Heroku My favorite Rails deployment option is Heroku, which is a hosted platform built specifically for deploying Rails and other Ruby web applications25 Heroku makes deploying Rails applications ridiculously easy as long as your source code is under version control with Git (This is yet another reason to follow the Git setup steps in Section 13 if you haven t already) The rest of this section is dedicated to deploying our first application to Heroku
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141 Heroku Setup
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After signing up for a Heroku account, install the Heroku gem:
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$ [sudo] gem install heroku
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As with GitHub (Section 134), when using Heroku you will need to create SSH keys if you haven t already, and then tell Heroku your public key so that you can use Git to push the sample application repository up to their servers:
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$ heroku keys:add
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Finally, use the heroku command to create a place on the Heroku servers for the sample app to live (Listing 17)
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23 Though it shouldn t matter for the example applications in Rails Tutorial, if you re worried about accidentally making your app public too soon there are several options; see Section 144 for one 24 Pronounced Engine X 25 Heroku works with any Ruby web platform that uses Rack middleware, which provides a standard interface between web frameworks and web servers Adoption of the Rack interface has been extraordinarily strong in the Ruby community, including frameworks as varied as Sinatra, Ramaze, Camping, and Rails, which means that Heroku basically supports any Ruby web app
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Deploying
Listing 17 Creating a new application at Heroku
$ heroku create Created http://severe-fire-61herokucom/ | git@herokucom:severe-fire-61git Git remote heroku added
Yes, that s it The heroku command creates a new subdomain just for our application, available for immediate viewing There s nothing there yet, though, so let s get busy deploying
142 Heroku Deployment, Step One
To deploy to Heroku, the first step is to use Git to push the application to Heroku:
$ git push heroku master
(Note: Some readers have reported getting an error in this step related to SQLite:
rake aborted! no such file to load -- sqlite3
The setup described in this chapter works fine on most systems, including mine, but if you encounter this problem you should try updating your Gemfile with the code in Listing 18, which prevents Heroku from trying to load the sqlite3-ruby gem)