Heroku is a PaaS(Platform as a Service) for running web apps that makes it as simple as a git push to deploy. They offer a free tier that is great for demos or quick testing environments and services such as redis, postgres, and many others.
There are a few minor changes from the default heroku gradle build pack to get your Grails 4 app run.
By default heroku will run the task stage to get your app ready. You could add a gradle task named stage or change the default task by running:
$ heroku config:set GRADLE_TASK="assemble"
The Procfile is used to tell heroku how to start your app, in this case, we need to pass the dynamically assigned port to our app, along with heroku's JAVA_OPTS. Lastly, tell it where gradle put our war/jar.
Procfile
web: java -Dserver.port=$PORT $JAVA_OPTS -jar build/libs/*.war
If you'd like to run on OpenJDK 11 - create a system.properties file with the following:
system.properties
java.runtime.version=11
And thats it. Push to Heroku and your app will build and deploy in about a minute.
$ git push heroku master
Enumerating objects: 3, done.
Counting objects: 100% (3/3), done.
Delta compression using up to 8 threads
Compressing objects: 100% (2/2), done.
Writing objects: 100% (2/2), 227 bytes | 227.00 KiB/s, done.
Total 2 (delta 1), reused 0 (delta 0)
remote: Compressing source files... done.
remote: Building source:
remote:
remote: -----> Gradle app detected
remote: -----> Installing JDK 11... done
remote: -----> Building Gradle app...
remote: -----> executing ./gradlew assemble
remote: > Task :compileJava NO-SOURCE
remote: > Task :compileGroovy
remote: > Task :buildProperties
remote: > Task :processResources
remote: > Task :classes
remote: > Task :compileGsonViews
remote: > Task :findMainClass
remote: > Task :bootWar
remote: > Task :war SKIPPED
remote: > Task :assemble
remote:
remote: BUILD SUCCESSFUL in 25s
remote: 6 actionable tasks: 6 executed
remote: -----> Discovering process types
remote: Procfile declares types -> (none)
remote:
remote: -----> Compressing...
remote: Done: 117.2M
remote: -----> Launching...
remote: Released v21
remote: https://my-app.herokuapp.com/ deployed to Heroku
remote:
remote: Verifying deploy... done.
To https://git.heroku.com/my-app.git
905744b..b239ff4 master -> master
See also:
https://devcenter.heroku.com/categories/java-support
https://devcenter.heroku.com/articles/deploying-gradle-apps-on-heroku
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