Kubernetes with HA in AWS

In this blog, we are setting up a highly available Kubernetes cluster in AWS using Kops

I am creating our Kubernetes cluster in a private VPC.

I hope everyone knows how to create a VPC architecture in AWS, so I will be mainly focusing on K8s.

K8s setup in AWS

Prerequisites:

  • AWS:

    • Cli
    • VPC
    • Public Subnets
    • Private Subnets
    • Route Tables
    • Internet Gateway
    • NAT Gateway
    • Route53 domain

  • Kops:

    You can easily download from here

  • Kubectl:

    You can easily install the package from here

  • AWS S3 bucket:

    • You need to create a unique AWS S3 bucket to manage your clusters even after installation.
    • Kops keep track of the clusters that you have created, along with their configuration, the keys they are using etc. This information is stored in an S3 bucket.

  • K8s HA setup:


kops create cluster \
    --node-count 3 \
    --zones us-east-1a,us-east-1b,us-east-1c \
    --master-zones us-east-1a,us-east-1b,us-east-1c \
    --dns-zone example.com \
    --node-size m4.large \
    --master-size m4.xlarge \
    --topology private \
    --networking weave \
    --vpc vpc-idxxxxx \
    --name k8s.example.com \
    --state s3://kops-state-k8s \
    --bastion
  • --node-count:- Specify the number of nodes
  • --zones:- Run nodes in multiple zones
  • --master-zones:- Run with a HA master
  • --dns-zone:- Specify your AWS DNS zone
  • --node-size:- Specify our K8s nodes to a defined instance type
  • --master-size:- Specify our K8s masters to a defined instance type
  • --topology:- Specify our nodes to launch in private/public subnets in VPC
  • --networking:- Specify which overlay network to use
  • --vpc:- Specify your VPC
  • --name:- Specify name of your cluster
  • --state:- Specify where to store the cluster state information
  • --bastion:- Jump host

You can edit the cluster by running the below command:


root# kops edit cluster <put your cluster name>

Change the VPC, Subnet configuration and you can update the cluster by running the below command


root# kops update cluster <put your cluster name>

Once you are finalized the AWS setup, you can execute it by running the below command


root# kops update cluster <put your cluster name> --yes
  • Once your cluster is up, you can play around with Kubectl