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AWS Self EKS

Links: 109 AWS Self Taught Index

Elastic Kubernetes Service

Basic Kubernetes Architecture

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Control Plane & Worker Nodes

It is a managed Kubernetes cluster which means AWS will manage the master nodes (control plane) for us.
  • The control plane is running in an AWS provisioned VPC and NOT the customer controlled VPC.
  • AWS manages everything about the control plane like backup, scaling, installing the required software etc. It does all the heavy lifting.
  • This ensures that we can focus on deploying our applications instead of managing the platform

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  • We only create the worker nodes and connect them to the cluster.
    • So the data plane/worker nodes runs in the customer VPC.
    • Worker nodes are nothing but EC2 instances with some CPU, RAM etc.

How to create a simple cluster

  • We create node groups (not single EC2 instances) and add them to the cluster.
  • We also have to define the Security Group, create roles for eks control plane and worker nodes, select instance type, resources etc.
  • With node groups we also have autoscaling and for this we define the max and min number of nodes.
  • We connect to the cluster from our local machine using kubectl
  • Diagrammatic representation of the flow
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This is a lot of effort for creating a simple Kubernetes cluster. We can simplify cluster creation using eksctl (eks create cluster).
  • It will create a cluster with default values. These parameters can be overridden.
  • This is community tool.

Miscellaneous

  • When using EKS we can either go with EC2 machines (node groups) or Fargate (Fargate Profiles).
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  • EKS can be integrated with a number of AWS services using add ons.

References

Last updated: 2022-08-10