The Hot Potato Challenge - A Go and Kubernetes Hacknight

You're invited to come hack together a network of micro-services. We will:

• Build a micro-service from scratch, however you want.
  • Push it to Docker hub (create an account if needed)
• You'll be given keys to a Kubernetes cluster (install kubectl from here).
  • Deploy to Kubernetes (using the sample service.yaml and deployment.yaml in this repo).
    • Use kubectl create -f service.yaml -f deployment.yaml
• We'll network all our micro-services:
  • Your service will call other folks's services (implementing the API below) creating a ginormous pipeline of text processing.
    • Ex: my process upper-cases its inputs, your process maps each word to a Tweet, etc..
• We'll see what gets created by calling each service.

API to implement

POST /process

{"text": "text",
 "history": [
    {"node": "user1", "text": "hello-world", "desc": "We upper-cased the hell out of it"},
  ]
}

Should output:

{"text": "new_text",
 "history": [
    {"node": "user1", "text": "hello-world"},
    {"node": "latest-call", "text": "new_text"},
 ]}

Always add your "text" reply to the history before returning, along with your hostname (or some other debug messages, for tracing).

Golang base code

type Potato struct {
    Text    string  `json:"text"`
    History []Entry `json:"history"`
}

type Entry struct {
    Node string `json:"node"`
    Text string `json:"text"`
    Desc string `json:"desc"`
}

Kubernetes configuration

Download the kube-potato file from the organizer. Place it somewhere safe. Run:

curl -O http://[organizer's-ip]:8000/kube-potato
export KUBECONFIG=`pwd`/kube-potato

You're all set.

To the organizer

Start a GCP Kubernetes cluster, the size you want.

Then:

export CLOUDSDK_CONTAINER_USE_CLIENT_CERTIFICATE=True
KUBECONFIG=/tmp/kube-potato gcloud container clusters get-credentials [NAME OF YOUR CLUSTER] --zone [ZONE] --project [PROJECT NAME]

(just prefix KUBECONFIG=/tmp/kube-potato to the command GCP gives you).

Share the /tmp/kube-potato file with participants.

You can share your local directory with:

python3 -m http.server

Find your IP and ask people to:

curl -O http://[your-ip]:8000/kube-potato