How to add roles to nodes in Kubernetes?

Question

When I provision a Kubernetes cluster using kubeadm and I get my nodes tagged as none. It\'s a know bug in Kubernetes and currently a PR is in-progress. However, I would lik

Answer 1

Before label:

general@master-node:~$ kubectl get nodes
NAME          STATUS   ROLES    AGE   VERSION
master-node   Ready    master   23m   v1.18.2
slave-node    Ready    <none>   19m   v1.18.2

kubectl label nodes <your_node> kubernetes.io/role=<your_label>

In my case slave-node e.g.

kubectl label nodes slave-node kubernetes.io/role=worker

After label:

general@master-node:~$ kubectl label nodes slave-node kubernetes.io/role=worker
node/slave-node labeled
general@master-node:~$ kubectl get nodes
NAME          STATUS   ROLES    AGE   VERSION
master-node   Ready    master   24m   v1.18.2
slave-node    Ready    worker   21m   v1.18.2

You can also change the label. Just put --overwrite

kubectl label --overwrite nodes <your_node> kubernetes.io/role=<your_new_label>

e.g.

kubectl label --overwrite nodes slave-node kubernetes.io/role=worker1

After overwriting the label:

general@master-node:~$ kubectl label --overwrite nodes slave-node kubernetes.io/role=worker1
node/slave-node labeled
general@master-node:~$ kubectl get nodes
NAME          STATUS   ROLES     AGE   VERSION
master-node   Ready    master    36m   v1.18.2
slave-node    Ready    worker1   32m   v1.18.2

Answer 2

A node role is just a label with the format node-role.kubernetes.io/<role>

You can add this yourself with kubectl label

Answer 3

This worked for me:

kubectl label node cb2.4xyz.couchbase.com node-role.kubernetes.io/worker=worker

NAME                                          STATUS    ROLES           AGE       VERSION
cb2.4xyz.couchbase.com                          Ready     custom,worker   35m       v1.11.1
cb3.5xyz.couchbase.com                          Ready     worker          29m       v1.11.1

I could not delete/update the old label, but I can live with it.

Answer 4

Default

Add Role

kubectl label node <node name> node-role.kubernetes.io/<role name>=<key - (any name)>

Remove Role

kubectl label node <node name> node-role.kubernetes.io/<role name>-