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Add nodes

While working with your cluster, you may need to update your managed node group configuration to add additional nodes to support the needs of your workloads. There are many ways to scale a node group, in our case we will be using the aws eks update-nodegroup-config command.

First let's retrieve the current nodegroup scaling configuration and look at minimum size, maximum size and desired capacity of nodes using eksctl command below:

~$eksctl get nodegroup --name $EKS_DEFAULT_MNG_NAME --cluster $EKS_CLUSTER_NAME


We'll scale the nodegroup in eks-workshop by changing the node count from 3 to 4 for desired capacity using below command:


~$aws eks update-nodegroup-config --cluster-name $EKS_CLUSTER_NAME \
  --nodegroup-name $EKS_DEFAULT_MNG_NAME --scaling-config minSize=4,maxSize=6,desiredSize=4


After making changes to the node group it may take up to 2-3 minutes for node provisioning and configuration changes to take effect. Let's retrieve the nodegroup configuration again and look at minimum size, maximum size and desired capacity of nodes using eksctl command below:


~$eksctl get nodegroup --name $EKS_DEFAULT_MNG_NAME --cluster $EKS_CLUSTER_NAME


Monitor the nodes in the cluster using the following command with the --watch argument until there are 4 nodes:


tip
It can take a minute or so for the node to appear in the output below, if the list still shows 3 nodes be patient.


~$kubectl get nodes --watch
NAME                                          STATUS     ROLES    AGE  VERSION
ip-10-42-104-151.us-west-2.compute.internal   Ready      <none>   3h   v1.31-eks-036c24b
ip-10-42-144-11.us-west-2.compute.internal    Ready      <none>   3h   v1.31-eks-036c24b
ip-10-42-146-166.us-west-2.compute.internal   NotReady   <none>   18s  v1.31-eks-036c24b
ip-10-42-182-134.us-west-2.compute.internal   Ready      <none>   3h   v1.31-eks-036c24b


Once 4 nodes are visible you can exit the watch using Ctrl+C.


You may see a node shows a status of NotReady, which happens when the new node is still in the process of joining the cluster.