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docs: Update about cluster_version variable requirement #988

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Aug 27, 2020
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docs: Update about cluster_version variable requirement #988

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11 changes: 8 additions & 3 deletions README.md
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Expand Up @@ -17,9 +17,14 @@ Read the [AWS docs on EKS to get connected to the k8s dashboard](https://docs.aw

## Important note

The default `cluster_version`is now 1.16. Kubernetes 1.16 includes a number of deprecated API removals, and you need to ensure your applications and add ons are updated, or workloads could fail after the upgrade is complete. For more information on the API removals, see the [Kubernetes blog post](https://kubernetes.io/blog/2019/07/18/api-deprecations-in-1-16/). For action you may need to take before upgrading, see the steps in the [EKS documentation](https://docs.aws.amazon.com/eks/latest/userguide/update-cluster.html#1-16-prequisites).
The `cluster_version` is the required variable. Kubernetes is evolving a lot, and each major version includes new features, fixes, or changes.

Please set explicitly your `cluster_version` to an older EKS version until your workloads are ready for Kubernetes 1.16.
**Always check [Kubernetes Release Notes](https://kubernetes.io/docs/setup/release/notes/) before updating the major version.**


You also need to ensure your applications and add ons are updated, or workloads could fail after the upgrade is complete. For action, you may need to take before upgrading, see the steps in the [EKS documentation](https://docs.aws.amazon.com/eks/latest/userguide/update-cluster.html).

An example of harming update was the removal of several commonly used, but deprecated APIs, in Kubernetes 1.16. More information on the API removals, see the [Kubernetes blog post](https://kubernetes.io/blog/2019/07/18/api-deprecations-in-1-16/).

## Usage example

Expand All @@ -45,7 +50,7 @@ provider "kubernetes" {
module "my-cluster" {
source = "terraform-aws-modules/eks/aws"
cluster_name = "my-cluster"
cluster_version = "1.16"
cluster_version = "1.17"
subnets = ["subnet-abcde012", "subnet-bcde012a", "subnet-fghi345a"]
vpc_id = "vpc-1234556abcdef"

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