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AWS Quick Start for Kubernets

Heptio AWS Quickstart

These are the CloudFormation templates and Packer configs for the Heptio AWS Quick Start. This is where active development is happening.

Details of the Quick Start are in this Heptio Blog post

Amazon's page for this is here.

This will be updated and pushed regularly to https://github.com/aws-quickstart/quickstart-heptio.

Deploying

The canonical way to deploy this Quick Start is by following the "Deploy on AWS into a new VPC" link on this project's AWS Quick Start Page.

You can see what's behind that link by checking AWS's fork of Heptio's repository at https://github.com/aws-quickstart/quickstart-heptio. The master branch of github.com/heptio/aws-quickstart is merged into AWS's repository and deployed to the Quick Start page on a monthly basis.

You can also deploy the Quick Start via the command line:

# Where to place your cluster
REGION=us-west-2
AZ=us-west-2b

# What to name your CloudFormation stack
STACK=Heptio-Kubernetes

# What SSH key you want to allow access to the cluster (must be created ahead of time in your AWS EC2 account)
KEYNAME=mykey

# What IP addresses should be able to connect over SSH and over the Kubernetes API
INGRESS=0.0.0.0/0

aws cloudformation create-stack \
  --region $REGION \
  --stack-name $STACK \
  --template-url "https://quickstart-reference.s3.amazonaws.com/heptio/latest/templates/kubernetes-cluster-with-new-vpc.template" \
  --parameters \
    ParameterKey=AvailabilityZone,ParameterValue=$AZ \
    ParameterKey=KeyName,ParameterValue=$KEYNAME \
    ParameterKey=AdminIngressLocation,ParameterValue=$INGRESS \
  --capabilities=CAPABILITY_IAM

Deploying latest master

If you want to try changes from this repository before they are released into AWS's Quick Start page, just change the Template URL, QSS3BucketName, and QSS3KeyPrefix to their development equivalents.

# This is where Heptio stores templates/scripts for the master branch of this repository
S3_BUCKET=heptio-aws-quickstart-test
S3_PREFIX=heptio/kubernetes/master

# Where to place your cluster
REGION=us-west-2
AZ=us-west-2b

# What to name your CloudFormation stack
STACK=Heptio-Kubernetes

# What SSH key you want to allow access to the cluster (must be created ahead of time in your AWS EC2 account)
KEYNAME=mykey

# What IP addresses should be able to connect over SSH and over the Kubernetes API
INGRESS=0.0.0.0/0

aws cloudformation create-stack \
  --region $REGION \
  --stack-name $STACK \
  --template-url "https://${S3_BUCKET}.s3.amazonaws.com/${S3_PREFIX}/templates/kubernetes-cluster-with-new-vpc.template" \
  --parameters \
    ParameterKey=AvailabilityZone,ParameterValue=$AZ \
    ParameterKey=KeyName,ParameterValue=$KEYNAME \
    ParameterKey=AdminIngressLocation,ParameterValue=$INGRESS \
    ParameterKey=QSS3BucketName,ParameterValue=${S3_BUCKET} \
    ParameterKey=QSS3KeyPrefix,ParameterValue=${S3_PREFIX} \
  --capabilities=CAPABILITY_IAM

Testing local changes

To deploy your own changes manually from source, you'll need to upload the contents of the scripts and templates directories to S3, and configure your CloudFormation to use those S3 URL's.

If you're making changes to things like the Kubernetes version or anything installed in the base AMI, you'll also need to rebuild the AMI with Packer. See the "Local development" section below for more details.

An example deployment:

S3_BUCKET=your-s3-bucket

# Where "path/to/your/files" is the directory in S3 under which the templates and scripts directories will be placed
S3_PREFIX=path/to/your/files

# Where to place your cluster
REGION=us-west-2
AVAILABILITY_ZONE=us-west-2b

# What you want to call your CloudFormation stack
STACK=my-kubernetes-cluster

# What SSH key you want to allow access to the cluster (must be created ahead of time in your AWS EC2 account)
KEYNAME=mykey

# What IP addresses should be able to connect over SSH and over the Kubernetes API
INGRESS=0.0.0.0/0

# Copy the files from your local directory into your S3 bucket
aws s3 sync --acl=public-read ./templates s3://${S3_BUCKET}/${S3_PREFIX}/templates/
aws s3 sync --acl=public-read ./scripts s3://${S3_BUCKET}/${S3_PREFIX}/scripts/

aws cloudformation create-stack \
  --region $REGION \
  --stack-name $STACK \
  --template-url "https://${S3_BUCKET}.s3.amazonaws.com/${S3_PREFIX}/templates/kubernetes-cluster-with-new-vpc.template" \
  --parameters \
    ParameterKey=AvailabilityZone,ParameterValue=$AZ \
    ParameterKey=KeyName,ParameterValue=$KEYNAME \
    ParameterKey=QSS3BucketName,ParameterValue=$S3_BUCKET \
    ParameterKey=QSS3KeyPrefix,ParameterValue=$S3_PREFIX \
    ParameterKey=AdminIngressLocation,ParameterValue=$INGRESS \
  --capabilities=CAPABILITY_IAM

Using the cluster

# Wait for the cluster to be up and running
aws cloudformation wait stack-create-complete --stack-name $STACK

# Get the command to download the kubeconfig file for the cluster
KUBECFG_DL=$(aws cloudformation describe-stacks --stack-name=$STACK --query 'Stacks[0].Outputs[?OutputKey==`GetKubeConfigCommand`].OutputValue' --output text)
echo $KUBECFG_DL
eval $KUBECFG_DL

# Set an environment variable to tell kubectl where to find this file
export KUBECONFIG=$(pwd)/kubeconfig
kubectl get nodes

Local development

This Quick Start is developed as a set of AWS CloudFormation templates. This is a brief overview of the files in this repo, for more architecture details see the Deployment Guide

The templates directory:

  • kubernetes-cluster.template sets up the resources that the Kubernetes cluster depends on. Mainly this is the API load balancer, the master node, the auto-scaling group of kubelet nodes, and the various security groups required to allow them to talk to one another. The nodes in this template are created from a base AMI, which you can recreate using the scripts in the packer directory in this repo.
  • kubernetes-cluster-with-new-vpc.template sets up a new VPC with a public and private subnets, and calls out to kubernetes-cluster.template as a sub-stack.

The scripts directory:

This contains files that required by the templates. This is to avoid inlining a lot of text directly in the template files. Templates access files from this directory by referencing their S3 URL's, which is why this directory and the templates directory both need to be copied into S3 in order to be used.

Some notable files in this directory:

  • setup-k8s-master.sh.in: This file is run by the master node on first boot as part of its initialization. It is a Mustache template file, with template variables that are set by the kubernetes-cluster.template template. Note that this template file does not install the Kubernetes binaries, those are baked into the AMI as part of the scripts in the packer directory.
  • calico.yaml, weave.yaml: These are networking add-ons which are applied with kubectl by the master after the Kubernetes cluster is initialized.

The packer directory:

This directory contains scripts for creating a new base AMI with Kubernetes pre-installed.

  • create-ami.sh: This file launches packer, configured to launch an instance in us-east-2 based on a stock Ubuntu 16.04 LTS image, installing Kubernetes, Docker, and various other components needed for the cluster to run. Packer will output the resulting AMI when complete.
  • payload/prepare-ami.sh: This file is the script run by packer on the EC2 instance, and is responsible for actually installing Kubernetes and the various other components. This is where we update the version of kubernetes baked into the AMI.
  • deploy-ami.sh: This is responsible for taking an AMI that was created by Packer and copying it into each region. It also outputs YAML suitable for copying into templates/kubernetes-cluster.template to configure the cluster with the right AMI ID for each region.