argocon-21-demo

Demo for my talk at ArgoCon '21 showing how to use Go to create and submit dynamic Argo Workflows. This repo implements a Go-based CLI called "feedme" that will accept one or more of the following meals to prepare using Argo Workflows:

omelette
egg-sandwich
turkey-sandwich
pasta
steak
cake

Usage:

./feedme --omelette --egg-sandwich --turkey-sandwich --pasta --steak --cake

Should create a workflow that looks like:

If you leave out any of the meals, the DAG will omit those branches. Running:

./feedme --steak --cake

Will produce:

Setup

1. Have a Kubernetes cluster available, I used Docker for Mac's.
2. Install Argo:

   kubectl create namespace argo
   kubectl apply -n argo -f https://github.com/argoproj/argo-workflows/releases/download/v3.2.4/install.yaml

3. Disable Argo Auth (for local installs only!):

   kubectl patch deployment -n argo argo-server -p '{"spec":{"template":{"spec":{"containers":[{"name":"argo-server","args":["server", "--auth-mode", "server"]}]}}}}'

4. Make Argo accessible outside the cluster (may differ depending on your K8s setup):

   kubectl patch service -n argo argo-server -p '{"spec":{"type":"NodePort"}}'
   # Get the Argo UI port:
   kubectl get service -n argo argo-server -oyaml | grep nodePort:
   # open the UI
   open https://localhost:<PORT>

5. Build this program (tested using Go 1.17 originally)

   go build -o feedme ./cmd

6. Run

   ./feedme omlette steak cake