Argo Workflow distribution on KOPS cluster

Question

Using KOPS tool, I deployed a cluster with:

• 1 Master
• 2 slaves
• 1 Load Balancer

Now, I am trying to deploy an Argo Workflow, but I don't know the process. Will it install on Node or Master of the k8s cluster I built? How does it work?

Basically, if anyone can describe the functional flow or steps of deploying ARGO work flow on kubernetes, it would be nice. First, I need to understand where is it deployed on Master or Worker Node?

Solidstate

Answer 1

Usually, kops creates Kubernetes cluster with taints on a master node that prevent regular pods scheduling on it.
Although, there was an issues with some cluster network implementation, and sometimes you are getting a cluster without taints on the master.

You can change taints on the master node by running the following commands:

add taints (no pods on master):

kubectl taint node kube-master node-role.kubernetes.io/master:NoSchedule

remove taints (allow to schedule pods on master):

kubectl taint nodes --all node-role.kubernetes.io/master-

If you want to know whether the taints are applied to the master node of not, run the following command:

kubectl get node node-master --export -o yaml

Find a spec: section. In case the taints are present, you should see something like this:

...
spec:
  externalID: node-master
  podCIDR: 192.168.0.0/24
  taints:
  - effect: NoSchedule
    key: node-role.kubernetes.io/master
...

Commerce

Aaah.. so pods can be created on Master as well and not just Worker nodes unless TAINTS are specified? – Solidstate

lab@10:~$ kubectl get nodes NAME STATUS ROLES AGE VERSION 10.0.1.4 Ready node 1d v1.9.5-23+1d79e1112c3ae5-dirty 10.0.1.5 Ready node 1d v1.9.5-23+1d79e1112c3ae5-dirty 10.0.1.6 Ready node 1d v1.9.5-23+1d79e1112c3ae5-dirty 10.0.1.7 Ready master 1d v1.9.5-23+1d79e1112c3ae5-dirty lab@10:~$ kubectl get node master --export -o yaml lab@10:~$ kubectl get node master --export -o yaml Error from server (NotFound): nodes "master" not found – Solidstate

^^^ is that how you check? am getting error node not found – Solidstate

You are using right command. kubernetes.io/docs/reference/generated/kubectl/… Try to run kubectl describe node <master-node-name> – Commerce

Check also the "Interacting with Nodes and Cluster" section in the cheatsheet: kubernetes.io/docs/reference/kubectl/cheatsheet – Commerce

kubectl get node 10.0.1.7 --export -o yaml – Commerce