Clojure on Google App Engine: Hello World

This is a sample project that showcases how to deploy a Clojure web application into Google App Engine.

For a Leiningen version of this project, see the lein branch of this repository.

NOTE: See all the files in this repository for comments regarding the various fiddly bits (app.yaml in particular).

Prerequisites

You must have these command-line tools installed:

• Clojure command-line tool
• gcloud command-line tool

Additionally, before continuing, you must authorize Google Cloud SDK Tools.

Steps

These steps assume the project ID of your GCP project is foo-bar-123456. Replace the ID with your own project ID when running these commands.

There are other ways of specifying the project ID. See the gcloud CLI docs.

1. Create a new Google Cloud Platform project:

   $ gcloud projects create foo-bar-123456

2. Create a new App Engine app:

   $ gcloud app create --project=foo-bar-123456

   In the prompt that appears, select the region where you want to deploy the app.

3. Create an uberjar:

   $ clj -A:uberjar

4. Copy app.yaml into the target directory:

   $ cp app.yaml target
   # This seems a bit inelegant, but I haven't figured out a better way.
   #
   # This is necessary because app.yaml and the deployable artifact need
   # to be in the same directory.

5. Deploy the application:

   $ gcloud app deploy --project=foo-bar-123456 target

6. Open the app in your browser:

   $ gcloud app browse --project=foo-bar-123456

   The first request's gonna take a while.