App Engine Flex :: Ruby WEBrick Hello World :: cloud.google.com/ruby

App Engine Flex :: WEBrick Hello World.md

App Engine Flex : Hello World!

Run a simple Ruby app! Just using WEBrick, no dependencies! Ruby standard library only!

Run locally

$ ruby app.rb

Deploy

Install the Google Cloud SDK.

See the Ruby App Engine Quickstart or Ruby Flex docs for more.

$ gcloud app deploy

Debug (SSH into container)

If you want to SSH into the container, just cuz...

Follow the documented steps for Debugging an Instance:

To SSH into a container, the following steps can all be run via gcloud... but, via the UI:

1. Go to the App Engine Instances page

2. Click SSH on any one of the instances

3. Confirm

4. (Optional) Print out the containers with docker ps

5. Run BASH in the app container

Notice that, by default, ruby is not in the PATH.

To see how this is confired by a running session, look at the base Dockerfile for the Ruby Runtime

Notice that we use rbenv and (1) setup RBENV_ROOT (2) add the rbenv bin and shims to PATH

Once that's done, you can use Ruby as usual!

See DEFAULT_RUBY_VERSION in the Dockerfile for the current default version used by the container. If your application has a .ruby-version file, that will be the version used. If you run your Ruby commands from your application directory /app then .ruby-version will be automatically used to choose your Ruby version appropriately.

app.rb

require "webrick"

server = WEBrick::HTTPServer.new Port: ENV["PORT"]
server.mount_proc("/") {|req,res| res.body = "Hi there!" }
server.start

app.yaml

env: flex
runtime: ruby
entrypoint: ruby app.rb

Thanks @remi, these instructions worked perfectly and the environment allowed me to run acceptance tests for google-cloud-ruby! Much appreciated!