README2.md

hello-app

The app used in this tutorial is a simple application that returns "Hello world!" and a counter of requests.

The message "world" can be configured in two ways:

• at startup using environment variable HELLO_MSG
• dynamically using the request path (e.g. curl localhost:8080/sunshine)

The counter tracks requests per message (world, sunshine, etc) and is stored in Redis. A sample response looks like this:

<h1>Hello sunshine 6!</h1>

You can view the source code here: src/hello-app.go.

Run locally

Start redis

docker run -d --rm --name hello-redis -p 6379:6379 redis

Start app

(cd src && go run hello-app.go)

or:

(cd src && HELLO_MSG=friend go run hello-app.go)

Send requests

Use a browser or separate terminal window:

curl localhost:8080            # returns world (or value of HELLO_MSG) and counter
curl localhost:8080/sunshine   # returns sunshine and counter

Stop

Stop app with <Ctrl+C>

Stop redis with:

docker stop hello-redis