jeket / terraform-k8s-the-real-hard-way-aws

Terraform code for "Kubernetes The (real) Hard Way (AWS)"

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.

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