Reputation: 2545

How to add roles to nodes in Kubernetes?

When I provision a Kubernetes cluster using kubeadm, I get my nodes tagged as "none". It's a known 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

Upvotes: 96

Answers (7)

Nicolas Labrot

Reputation: 4116

On top of everything that has already been answered since k8S 1.16, the kubernetes.io/ and k8s.io/ prefixes are reserved for Kubernetes core components.

The suggested way is to create your own namespace to label a kubernetes node by simply reproducing the kubelet way.

For example as a label key node-role.[your-domain]/[role]=. No label value is needed, the label key is actually a tag.

kubectl label node [node-name] node-role.[your-namespace]/[role]=

Where:

node-name is your node name (returned by kubectl get node)
your-namespace is the "domain" of your namespace (eg. acme.org)
role is the node role, (eg. database)

For example:

kubectl label node node001 node-role.acme.org/database=

Upvotes: 1

user21028463

Reputation:

In my case i was able to do that with below commands

kubectl label nodes ip-10-0-47-13.ec2.internal kubernetes.io/role=worker

Output

node/ip-10-0-47-13.ec2.internal labeled

mansoor.hasan@PURE-DEV-MANSOORHASAN EKS % kubectl get nodes                                                       
NAME                         STATUS   ROLES    AGE    VERSION
ip-10-0-47-13.ec2.internal   Ready    worker   161m   v1.20.15-eks-fb459a0

Upvotes: 2

Praveen Kumar K S

Reputation: 3074

Add Roles

$ kubectl get nodes 

master  Ready    control-plane,master   166m    v1.21.1
worker1  Ready    worker                 48m     v1.21.1
worker2  Ready    worker                 16m     v1.21.1
worker3   Ready    worker                 9m57s   v1.21.1    

$ kubectl label node worker1  node-role.kubernetes.io/worker=worker

$ kubectl label node worker2  node-role.kubernetes.io/worker=worker

$ kubectl label node worker3  node-role.kubernetes.io/worker=worker

In case if you wanted to overwrite, please use this below command.

$ kubectl label node worker1  node-role.kubernetes.io/worker=worker --overwrite

Upvotes: 5

Isuru Amarathunga

Reputation: 2397

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>-

Upvotes: 32

Kamlesh

Reputation: 679

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

Upvotes: 15

ram dhakne

Reputation: 1144

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.

Upvotes: 111

Jordan Liggitt

Reputation: 18161

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

You can add this yourself with kubectl label

Upvotes: 65

How to add roles to nodes in Kubernetes?

Answers (7)

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