K
Q

How to add roles to nodes in Kubernetes?

2/18/2018

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 like to know if there is an option to add a Role name manually for the node?

root@ip-172-31-14-133:~# kubectl get nodes
NAME               STATUS    ROLES     AGE       VERSION
ip-172-31-14-133   Ready     master    19m       v1.9.3
ip-172-31-6-147    Ready     <none>    16m       v1.9.3
-- Jeel
kubeadm
kubernetes

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4 Answers

7/27/2018

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.

-- ram dhakne
Source: StackOverflow
2/18/2018

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

You can add this yourself with kubectl label

-- Jordan Liggitt
Source: StackOverflow
12/24/2019

Default
enter image description here

Add Role

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

enter image description here

Remove Role

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

enter image description here

-- Isuru Amarathunga
Source: StackOverflow
5/12/2020

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
-- Kamlesh
Source: StackOverflow