Amazon EKS Operations

Internal

• Amazon Elastic Kubernetes Service
• aws-iam-authenticator
• kubectl
• eksctl

Create and Delete Cluster

Create and Delete Cluster

Cluster Information

Cluster Status

aws eks [--region us-east-1] describe-cluster --name example-cluster --query "cluster.status"

"ACTIVE"

If the right region is configured in the profile, there is no need to be specified.

Cluster Endpoint

aws eks [--region us-east-1] describe-cluster --name example-cluster --query "cluster.endpoint" --output text

https://FDXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX.gr0.us-east-1.eks.amazonaws.com

If the right region is configured in the profile, there is no need to be specified.

Cluster Certificate Authority

aws eks [--region us-east-1] describe-cluster --name example-cluster --query "cluster.certificateAuthority.data" --output text

LS0t...LQo=

If the right region is configured in the profile, there is no need to be specified.

kubectl Context

Amazon EKS kubectl Context

Allowing Additional Users to Access the Cluster

https://docs.aws.amazon.com/eks/latest/userguide/add-user-role.html

Allow IAM Role Access

Individual AWS users (authenticating as particular IAM Users) can be allowed access if an IAM role is "allowed" access to the Kubernetes cluster by associating it with RBAC roles or groups, and then the IAM role is configured to allow IAM users to assume it. This is the preferred solution, because different roles can be associated with different cluster permissions, and the same user can access the cluster with different permissions, by just using a different role.

1. Create an IAM role dedicated to cluster access, as described here: Create a Role to Delegate Permission to an IAM User.

2. Update aws-auth ConfigMap to allow the IAM role to access the Kubernetes cluster. This is done by associating it with a specific set of RBAC permissions, denoted by a group or Kubernetes role:

kubectl -n kube-system edit cm aws-auth

apiVersion: v1
kind: ConfigMap
metadata:
  name: aws-auth
  namespace: kube-system
data:
  mapRoles: |
    - rolearn: arn:aws:iam::...
      username: system:node:{{EC2PrivateDNSName}}
      groups:
      - system:bootstrappers
      - system:nodes
    - rolearn: arn:aws:iam::999999999999:role/playground-eks-cluster-admin
      groups:
      - system:masters

Allow Individual IAM User Access

Configuring individual user access directly in aws-auth ConfigMap is less preferable than using an IAM role for access, for reasons explained in that section.

TODO https://docs.aws.amazon.com/eks/latest/userguide/getting-started-eksctl.html

Associate an IAM Role with a Kubernetes User

This procedure describe defining a Kubernetes User from an IAM Role.

1. Create an IAM role dedicated to cluster access, as described here: Create a Role to Delegate Permission to an IAM User. Use the following convention when naming it:

<cluster-name>-eks-namespaced-edit-role

2. Edit aws-auth ConfigMap and associate the IAM role with a Kubernetes User:

kubectl -n kube-system edit cm aws-auth

kind: ConfigMap
data:
  mapRoles: |
    - rolearn: arn:aws:iam::999999999999:role/blue-experimental-role
      username: blue-experimental-user

Load Balancer Troubleshooting

https://aws.amazon.com/premiumsupport/knowledge-center/eks-load-balancers-troubleshooting/

EFS CSI Operations

EFS CSI Operations

EKS Webhook Token Authentication

EKS Webhook Token Authentication

Scale Up Node Group

https://docs.aws.amazon.com/eks/latest/userguide/update-managed-node-group.html

EKS Console → Amazon EKS Clusters → Select cluster → Compute → Select group → Edit → Minimum/Maximum/Desired size.

Scale minimum and desired up.

The current nodes will not be removed.