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Dummy HTTP app for a Sensu demo.

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v## What is this?

A simple Golang web app that demonstrates the HTTP GET /healthz endpoint pattern for Kubernetes readinessProbe and livenessProbe checks.

How do I use it?

  1. Clone this repo

    $ git clone git@github.com:portertech/demo-app.git demo-app
    
  2. Compile a statically linked binary of the demo-app app

    $ cd demo-app
    $ CGO_ENABLED=0 GOOS=linux go build -a -ldflags '-extldflags "-static"' .
    

    NOTE: Installing golang is left as an exercise for the reader.

  3. Build a Docker image

    $ docker build -t demo-app:latest .
    

    NOTE: Installing docker and general help around building Docker containers is left as an exercise for the reader.

  4. Run the container

    $ docker run -p 8080:8080 -t demo-app:latest
    
  5. Query the web app using curl to observe it running:

    $ curl -XGET -I http://127.0.0.1:8080/healthz
    HTTP/1.1 200 OK
    Date: Wed, 18 Oct 2017 15:57:03 GMT
    Content-Length: 7
    Content-Type: text/plain; charset=utf-8
    
    

    NOTE: determining the IP address of your running container is left as an exercise for the reader; hint: run docker ps for clues.

  6. Toggle the status of the running app by posting to the /healthz endpoint:

    $ curl -XPOST -I http://127.0.0.1:8080/healthz
    HTTP/1.1 200 OK
    Date: Wed, 18 Oct 2017 15:58:21 GMT
    Content-Length: 0
    Content-Type: text/plain; charset=utf-8
    
    
  7. Query the web app again using curl to observe the "unhealthy" status:

    $ curl -XGET -I http://127.0.0.1:8080/healthz
    HTTP/1.1 500 Internal Server Error
    Content-Type: text/plain; charset=utf-8
    X-Content-Type-Options: nosniff
    Date: Wed, 18 Oct 2017 15:58:24 GMT
    Content-Length: 10
    
    

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