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December 25, 2021 02:54 pm GMT

Manage EKS aws-auth configmap with terraform

Introduction

Hi, everyone.
I would like to leave a memorandum about how to manage Kubernetes's configmap AWS auto-generated with terraform.

What Trouble

  • If we want to add iam user/role for eks cluster operation, we need to fix auto-generated aws-auth configmap(namespace:kube-system)
  • If we follow the official manual: https://docs.aws.amazon.com/eks/latest/userguide/add-user-role.html), we should manage it with kubernetes manifest yml, but we want to manage it with terraform.
    • Because at first we can access our eks cluster only with IAM user/role used when creating cluster(with ~/.kube/config as below) and our cluster generated role is terraform user/role
    • Therefore, We want to add user/role to aws-auth configmap with terraform user/role and manage aws-auth configmap with terraform.
# ~/.kube/config- name: arn:aws:eks:ap-northeast-1:9999999999:cluster/eks-example  user:    exec:      apiVersion: client.authentication.k8s.io/v1alpha1      args:      - --region      - ap-northeast-1      - eks      - get-token      - --cluster-name      - eks-example      command: aws      env: null      provideClusterInfo: false

How to resolve the trouble

1. Add terraform aws-auth configmap resouece and Use terraform import command

1.0 Prepare terraform kubernetes provider

provider "kubernetes" {  host                   = data.aws_eks_cluster.eks.endpoint  cluster_ca_certificate = base64decode(data.aws_eks_cluster.eks.certificate_authority[0].data)  token                  = data.aws_eks_cluster_auth.eks.token}

1.1 Prapare aws-auth configmap tf resource for importing

# aws-auth.tfresource "kubernetes_config_map" "aws-auth" {  data = {    "mapRoles" = ""  }  metadata {    name      = ""    namespace = ""  }}

1.2 Execute terraoform import cmd

terraform import kubernetes_config_map.aws-auth kube-system/aws-auth

1.3 terraform plan and remove diff from real resource state to resource config

resource "kubernetes_config_map" "aws-auth" {  data = {    "mapRoles" = <<EOT- rolearn: arn:aws:iam::99999999999:role/hoge-role  username: system:node:{{EC2PrivateDNSName}}  groups:    - system:bootstrappers    - system:nodes      # Therefore, before you specify rolearn, remove the path. For example, change arn:aws:iam::<123456789012>:role/<team>/<developers>/<eks-admin> to arn:aws:iam::<123456789012>:role/<eks-admin>. FYI:https://docs.aws.amazon.com/eks/latest/userguide/troubleshooting_iam.html#security-iam-troubleshoot-ConfigMapEOT  }  metadata {    name      = "aws-auth"    namespace = "kube-system"  }}

2. Fix aws-auth configmap resource we imported and add iam user/role

resource "kubernetes_config_map" "aws-auth" {  data = {    "mapRoles" = <<EOT- rolearn: arn:aws:iam::99999999999:role/hoge-role  username: system:node:{{EC2PrivateDNSName}}  groups:    - system:bootstrappers    - system:nodes      # Therefore, before you specify rolearn, remove the path. For example, change arn:aws:iam::<123456789012>:role/<team>/<developers>/<eks-admin> to arn:aws:iam::<123456789012>:role/<eks-admin>. FYI:https://docs.aws.amazon.com/eks/latest/userguide/troubleshooting_iam.html#security-iam-troubleshoot-ConfigMap# Add as below - rolearn: hoge  username: hoge  groups: # REF: https://kubernetes.io/ja/docs/reference/access-authn-authz/rbac/    - hogeEOT  }  metadata {    name      = "aws-auth"    namespace = "kube-system"  }}

References


Original Link: https://dev.to/fukubaka0825/manage-eks-aws-auth-configmap-with-terraform-4ndp

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