Q: What is Amazon Elastic Kubernetes Service (Amazon EKS)?
A: Amazon EKS is a managed service that makes it easy for you to run Kubernetes on AWS without needing to install and operate your own Kubernetes control plane.
Q: What is Kubernetes?
A: Kubernetes is open source software that allows you to deploy and manage containerized applications at scale. Kubernetes groups containers into logical groupings for management and discoverability, then launches them onto clusters of EC2 instances. Using Kubernetes you can run containerized applications including microservices, batch processing workers, and platforms as a service (PaaS) using the same toolset on premises and in the cloud.
Q: Why should I use Amazon EKS?
A: Amazon EKS provisions and scales the Kubernetes control plane, including the API servers and backend persistence layer, across multiple AWS availability zones for high availability and fault tolerance. Amazon EKS automatically detects and replaces unhealthy control plane nodes and provides patching for the control plane. Amazon EKS is integrated with many AWS services to provide scalability and security for your applications. These services include Elastic Load Balancing for load distribution, IAM for authentication, Amazon VPC for isolation, and AWS CloudTrail for logging.
Q: How does Amazon EKS work?
A: Amazon EKS works by provisioning (starting) and managing the Kubernetes control plane for you. At a high level, Kubernetes consists of two major components - a cluster of 'worker nodes' that run your containers and the control plane that manages when and where containers are started on your cluster and monitors their status.
Without Amazon EKS, you have to run both the Kubernetes control plane and the cluster of worker nodes yourself. With Amazon EKS, you provision your cluster of worker nodes using the provided Amazon Machine Image (AMI) and AWS CloudFormation script and AWS handles provisioning, scaling, and managing the Kubernetes control plane in a highly available and secure configuration. This removes a significant operational burden for running Kubernetes and allows you to focus on building your application instead of managing AWS infrastructure.
Q: Which operating systems does Amazon EKS support?
A: Amazon EKS supports Linux x86 and Windows Server operating system distributions that are compatible with Kubernetes. Amazon EKS provides optimized AMIs for Amazon Linux 2 and Windows Server 2019. EKS-optimized AMIs for other Linux distributions, such as Ubuntu, are available from their respective vendors.
Q: Does Amazon EKS work with my existing Kubernetes applications and tools?
A: Amazon EKS runs the open-source Kubernetes software, so you can use all the existing plugins and tooling from the Kubernetes community. Applications running on Amazon EKS are fully compatible with applications running on any standard Kubernetes environment, whether running in on-premises datacenters or public clouds. This means that you can easily migrate any standard Kubernetes application to Amazon EKS without any code modifications.
Q: Does Amazon EKS work with AWS Fargate?
A: No. There is currently no native AWS integration between Amazon EKS and AWS Fargate.
Kubernetes versions and updates
Q: Which Kubernetes versions does Amazon EKS support?
A: Amazon EKS supports Kubernetes version 1.11, 1.12, 1.13, and 1.14 and will continue to add support for additional Kubernetes versions in the future.
Q: Can I update my Kubernetes cluster to a new version?
A: Yes. Amazon EKS performs managed, in-place cluster upgrades for both Kubernetes and Amazon EKS platform versions. This simplifies cluster operations and lets you take advantage of the latest Kubernetes features, as well as the updates to Amazon EKS configuration and security patches.
There are two types of updates that you can apply to your Amazon EKS cluster, Kubernetes version updates and Amazon EKS platform version updates. As new Kubernetes versions are released and validated for use with Amazon EKS, we will support three stable Kubernetes versions as part of the update process at any given time.
Q: What is an EKS platform version?
A: Amazon EKS platform versions represent the capabilities of the cluster control plane, such as which Kubernetes API server flags are enabled, as well as the current Kubernetes patch version. Each Kubernetes minor version has one or more associated Amazon EKS platform versions. The platform versions for different Kubernetes minor versions are independent.
When a new Kubernetes minor version is available in Amazon EKS (for example, 1.13), the initial Amazon EKS platform version for that Kubernetes minor version starts at eks.1. However, Amazon EKS releases new platform versions periodically to enable new Kubernetes control plane settings and to provide security fixes.
Q: Why would I want manual control over Kubernetes version updates?
A: New versions of Kubernetes introduce significant change to the Kubernetes API, and as a result, can result in changed application behavior. Manual control over the version of Kubernetes on your cluster allows you to test applications against new versions of Kubernetes before upgrading production clusters. Amazon EKS provides you the ability to choose when you introduce changes to your EKS cluster.
Q: How do I update my worker nodes?
A: AWS publishes EKS Amazon Machine Images (AMIs) that include the necessary worker node binaries (Docker and Kubelet). This AMI is updated regularly and builds in the most up to date version of these components. AWS also publishes Packer scripts that document our build steps, allowing you to identify the binaries included in each version of the AMI. You can use existing Auto Scaling functionality to update worker instances to the latest version of the EKS AMI. You can also use our Packer scripts to build a new version of a custom AMI.
Pricing and availability
Q: How much does Amazon EKS cost?
A: You pay $0.20 per hour for each Amazon EKS cluster that you create and for the AWS resources you create to run your Kubernetes worker nodes. You only pay for what you use, as you use it; there are no minimum fees and no upfront commitments.
Q: Where is Amazon EKS available?
A: Please visit the AWS global infrastructure region table for the most up-to-date information on Amazon EKS regional availability.
Service Level Agreement
Q: What is Amazon EKS Service Level Agreement (SLA)?
A: The Amazon EKS SLA can be found here.