Running the PoC on Docker Desktop + WSL

[frankcorneliusmartin]

I needed to make a few changes to run the demo on Docker desktop on Windows.

1. Enable Kubernetes in the settings of Docker desktop / install kubectl
2. To get the Kubernetes Dashboard (requires cert-manager and nginx-ingress-controller):

kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v1.8.2/deploy/static/provider/cloud/deploy.yaml
kubectl apply -f https://github.com/cert-manager/cert-manager/releases/download/v1.14.1/cert-manager.yaml 
kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/v3.0.0-alpha0/charts/kubernetes-dashboard.yaml

3. Bind the dashboard to localhost:

kubectl -n ingress-nginx port-forward svc/ingress-nginx-controller 8443:443

4. Generate access token

kubectl get secret admin-user -n kubernetes-dashboard -o jsonpath={".data.token"} | base64 -d

Now you can login at https://localhost with this token.

5. Change the mount paths. In order to access the files in the hostmachine you have to use the /run/desktop/mnt/host/c path. (see stack overflow for more details)

   • I moved the v6-node-config-file (node_config.yaml) and kube-config-file (config) to my c:/data/k8s folder so I would be able to mount them. The node_pod_config then becomes:

apiVersion: v1
kind: Pod
metadata:
 name: poc-node-pod
spec:
 containers:
 ...

 volumes:
 - name: task-files-root
   hostPath:
     path: /home/frank/tmp/tasks
 - name: kube-config-file
   hostPath:
     path: /run/desktop/mnt/host/c/data/k8s/config
 - name: v6-node-config-file
   hostPath:
     path: /run/desktop/mnt/host/c/data/k8s/node_config.yaml

6. I had difficulties finding the right IP settings as the routing was a bit unclear to me (because my lack of Kubernetes/windows experience), therefore I changed that the server listens to interface 0.0.0.0. Thus server_config.yaml becomes:

# IP address of the adapter where the server will be listening to
server_ip: 0.0.0.0

# port
port: 5000

7. Run the server on the windows machine (not in the WSL instance): python simple_sio_server.py
8. I had to change the host IP in the node config to host.docker.internal in order to reach my simple server in my windows system:

apiVersion: v1
kind: Pod
metadata:
 name: poc-node-pod
spec:
 containers:
 - name: dummy-node-server
   image: docker.io/hectorcadavid/dummy-node-x86:latest
   tty: true
   env:
   - name: HOST_IP
     value: host.docker.internal
   command: ["python", "node.py"]
   volumeMounts:
   - name: task-files-root
     mountPath: /app/tasks
   - name: kube-config-file
     mountPath: /app/.kube/config
   - name: v6-node-config-file
     mountPath: /app/.v6node/node_config.yaml
volumes: 
  ...

9. Change the IP in the command_emmiter.py to the IP the server listens on. From windows localhost should do, if you want to run it from your WSL instance you need to use the WSL interface at your hostmachine. In powershell: ipconfig and look for the WSL adapter.