Autenticathion issue

[valots12]

Hi everyone,
I'm trying to getting familiar with the kwok tool. After installing it and switching the context to kwok-demo I receive a message error for every command, like getting nodes:

error: You must be logged in to the server (Unauthorized)

Can someone help me to solve this?
Thanks in advance, I'm sorry but I'm very new in this env

[wzshiming]

Looks like a problem with the kubeconfig settings, Can you provide the steps to reproduce it?

[valots12]

Yeah sure. I followed the instruction for the installation of minikube and kwok and executed these commands:

minikube start
kwokctl --name demo create cluster
kwokctl get clusters
kubectl config use-context kwok-demo
kubectl get nodes

[wzshiming]

Why do you need to start minikube first?

https://kwok.sigs.k8s.io/docs/user/kwokctl-manage-cluster/
https://kwok.sigs.k8s.io/docs/user/kwok-manage-nodes-and-pods/

[valots12]

I would like to simulate a Argo workflow pipeline using fake nodes, don't I need to start minikube before?

[wzshiming]

The main job of Kwok is a behavioral simulation, which is mainly Node and Pod. so a controller deployed on a kwok node won't really work and won't be able to handle CRD. this requires a way to run the controller, and Kind is a great addition.

[valots12]

and it's not possible to simulate resources just using Kind, is it correct?

[wzshiming]

You can install a Kwok controller in a Kind cluster or run a Kwok controller outside the cluster to simulate resources.

https://kwok.sigs.k8s.io/docs/user/kwok-in-cluster/
https://kwok.sigs.k8s.io/docs/user/kwok-out-cluster/

[valots12]

ok, thanks a lot

[valots12]

I made some progress, but I still have some doubts about kwok. After creating a kind cluster and installing argo workflows, it's easy to submit a pipeline using the argo controller. In order to use fake resources, is it correct if I install kwok in the cluster and create a fake node in the argo namespace? Then the missing step would be the integration between argo and kwok controllers.

[wzshiming]

Follow the steps below and I guess it should be what you want

Set up cluster

wget https://github.com/kubernetes-sigs/kwok/raw/main/stages/pod-fast.yaml
sed 's/Job/Workflow/g' pod-fast.yaml > workflow-fast.yaml
kwokctl create cluster --runtime kind -c workflow-fast.yaml

Deploy argo

kubectl create namespace argo
kubectl apply -n argo -f https://github.com/argoproj/argo-workflows/releases/download/v3.4.8/install.yaml
kubectl patch deploy argo-server -n argo --type=json -p='[{"op":"add","path":"/spec/template/spec/nodeName","value":"kwok-kwok-control-plane"}]'
kubectl patch deploy workflow-controller -n argo --type=json -p='[{"op":"add","path":"/spec/template/spec/nodeName","value":"kwok-kwok-control-plane"}]'

Create node

kubectl apply -f - <<EOF
apiVersion: v1
kind: Node
metadata:
  annotations:
    node.alpha.kubernetes.io/ttl: "0"
    kwok.x-k8s.io/node: fake
  labels:
    beta.kubernetes.io/arch: amd64
    beta.kubernetes.io/os: linux
    kubernetes.io/arch: amd64
    kubernetes.io/hostname: kwok-node-0
    kubernetes.io/os: linux
    kubernetes.io/role: agent
    node-role.kubernetes.io/agent: ""
    type: kwok
  name: kwok-node-0
status:
  allocatable:
    cpu: 32
    memory: 256Gi
    pods: 110
  capacity:
    cpu: 32
    memory: 256Gi
    pods: 110
EOF

Test

argo submit -n argo --watch https://raw.githubusercontent.com/argoproj/argo-workflows/master/examples/hello-world.yaml

Name:                hello-world-p9g6d
Namespace:           argo
ServiceAccount:      unset (will run with the default ServiceAccount)
Status:              Succeeded
Conditions:          
 PodRunning          False
 Completed           True
Created:             Wed Jun 14 12:02:21 +0800 (10 seconds ago)
Started:             Wed Jun 14 12:02:21 +0800 (10 seconds ago)
Finished:            Wed Jun 14 12:02:31 +0800 (now)
Duration:            10 seconds
Progress:            1/1
ResourcesDuration:   0s*(100Mi memory),0s*(1 cpu)

STEP                  TEMPLATE  PODNAME            DURATION  MESSAGE
 ✔ hello-world-p9g6d  whalesay  hello-world-p9g6d  1s       

kubectl get pod -n argo -o wide
NAME                                   READY   STATUS      RESTARTS      AGE     IP           NODE                      NOMINATED NODE   READINESS GATES
argo-server-74988d78f-5mvls            1/1     Running     0             16m     10.244.0.6   kwok-kwok-control-plane   <none>           <none>
hello-world-lsznk                      0/2     Completed   0             10m     10.244.1.0   kwok-node-0               <none>           <none>
workflow-controller-786dc8cdb6-7g56s   1/1     Running     2 (12m ago)   16m     10.244.0.5   kwok-kwok-control-plane   <none>           <none>

[valots12]

thanks, it is working now. can I ask you how the artifacts are handled with this optional command?

[wzshiming]

There are no artifacts, all are fake. 😄

[valots12]

Yes of course 😄 but how can the workflow be simulated then?

[valots12]

is it the same of running a yaml without artifacts?

[wzshiming]

Hmmm, I'm not sure about the details of argo, maybe you need to ask in their community.