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Terraform - Kubernetes The (real) Hard Way on AWS!

This little project creates the infrastructure in Terraform for my blog post Kubernetes The (real) Hard Way on AWS.

AWS CDK Python code available 🔗 HERE

You can practice creating a multi node K8s Cluster yourself for training purposes or CKA exam preparation.

Alt text

Requirements

  • aws-cli Profile
  • Existing AWS Route53 Public Hosted Zone

Features

Default values - you can adapt all of them to your needs

  • Terraform 0.12
  • 1x VPC, 3x Public Subnets, 3x Private Subnets, Route Tables, Routes
  • 3x Worker Nodes
  • 3x Master Nodes
  • 3x Etcd Nodes
  • 1x Bastion Host
  • Genertes AWS Key Pair for instances
  • Route53 Records for internal & external IPv4 addresses
  • 1x Public LoadBalancer for Master Nodes (external kubectl access)
  • 1x Private LoadBalancer for Master Nodes (fronting kube-apiservers)
  • 1x Public LoadBalancer for Bation Host (AutoScalingGroup)
  • Gets most recent Ubuntu AMI for all regions
  • Install awscli, cfssl, cfssl_json via UserData
  • Allows external access from workstation IPv4 address only

Inputs

Name Description Type Default Required
availability_zones Number of different AZs to use number "3" no
aws_key_pair_name AWS Key Pair name to use for EC2 Instances (if already existent) string "null" no
aws_profile AWS cli profile (e.g. default) string "default" no
aws_region AWS region (e.g. us-east-1 => US North Virginia) string "us-east-1" no
aws_vpc_cidr VPC CIDR block string "10.23.0.0/16" no
bastion_instance_type EC2 instance type for Bastion Host string "t3a.small" no
bastion_max_size Maximum number of EC2 instances for Bastion AutoScalingGroup number "1" no
bastion_min_size Minimum number of EC2 instances for Bastion AutoScalingGroup number "1" no
bastion_size Desired number of EC2 instances for Bastion AutoScalingGroup number "1" no
etcd_instance_type EC2 instance type for etcd instances string "t3a.small" no
etcd_max_size Maximum number of EC2 instances for etcd AutoScalingGroup number "3" no
etcd_min_size Minimum number of EC2 instances for etcd AutoScalingGroup number "3" no
etcd_size Desired number of EC2 instances for etcd AutoScalingGroup number "3" no
hosted_zone Route53 Hosted Zone for creating records (without . suffix, e.g. napo.io) string n/a yes
master_instance_type EC2 instance type for K8s master instances string "t3a.small" no
master_max_size Maximum number of EC2 instances for K8s Master AutoScalingGroup number "3" no
master_min_size Minimum number of EC2 instances for K8s Master AutoScalingGroup number "3" no
master_size Desired number of EC2 instances for K8s Master AutoScalingGroup number "3" no
owner Owner name used for tags string "napo.io" no
pod_cidr The first two octets for the Pod network CIDR (used in Worker UserData to generate POD_CIDR envvar) string "10.200" no
project Project name used for tags string "k8s-the-right-hard-way-aws" no
ssh_public_key_path SSH public key path (to create a new AWS Key Pair from existing local SSH public RSA key) string "~/.ssh/id_rsa.pub" no
stage Environment name (e.g. testing, dev, staging, prod) string "testing" no
worker_instance_type EC2 instance type for K8s worker instances string "t3a.small" no
worker_max_size Maximum number of EC2 instances for K8s Worker AutoScalingGroup number "3" no
worker_min_size Minimum number of EC2 instances for K8s Worker AutoScalingGroup number "3" no
worker_size Desired number of EC2 instances for K8s Worker AutoScalingGroup number "3" no

Outputs

Name Description
route53_bastion_public_fqdn Route53 record for Bastion Host Load Balancer
route53_master-public-lb_public_fqdn Route53 record for Master Public Load Balancer