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*** PLEASE NOTE: This document applies to the HEAD of the source tree only. If you are using a released version of Kubernetes, you almost certainly want the docs that go with that version.

Documentation for specific releases can be found at releases.k8s.io.

Getting started on Amazon EC2 with CoreOS

The example below creates an elastic Kubernetes cluster with a custom number of worker nodes and a master.

Warning: contrary to the supported procedure, the examples below provision Kubernetes with an insecure API server (plain HTTP, no security tokens, no basic auth). For demonstration purposes only.

Highlights

Prerequisites

Starting a Cluster

CloudFormation

The cloudformation-template.json can be used to bootstrap a Kubernetes cluster with a single command:

aws cloudformation create-stack --stack-name kubernetes --region us-west-2 \
--template-body file://aws/cloudformation-template.json \
--parameters ParameterKey=KeyPair,ParameterValue=<keypair> \
             ParameterKey=ClusterSize,ParameterValue=<cluster_size> \
             ParameterKey=VpcId,ParameterValue=<vpc_id> \
             ParameterKey=SubnetId,ParameterValue=<subnet_id> \
             ParameterKey=SubnetAZ,ParameterValue=<subnet_az>

It will take a few minutes for the entire stack to come up. You can monitor the stack progress with the following command:

aws cloudformation describe-stack-events --stack-name kubernetes

Record the Kubernetes Master IP address:

aws cloudformation describe-stacks --stack-name kubernetes

Skip to kubectl client configuration

AWS CLI

The following commands shall use the latest CoreOS alpha AMI for the us-west-2 region. For a list of different regions and corresponding AMI IDs see the CoreOS EC2 cloud provider documentation.

Create the Kubernetes Security Group

aws ec2 create-security-group --group-name kubernetes --description "Kubernetes Security Group"
aws ec2 authorize-security-group-ingress --group-name kubernetes --protocol tcp --port 22 --cidr 0.0.0.0/0
aws ec2 authorize-security-group-ingress --group-name kubernetes --protocol tcp --port 80 --cidr 0.0.0.0/0
aws ec2 authorize-security-group-ingress --group-name kubernetes --source-security-group-name kubernetes

Save the master and node cloud-configs

Launch the master

Attention: replace <ami_image_id> below for a suitable version of CoreOS image for AWS.

aws ec2 run-instances --image-id <ami_image_id> --key-name <keypair> \
--region us-west-2 --security-groups kubernetes --instance-type m3.medium \
--user-data file://master.yaml

Record the InstanceId for the master.

Gather the public and private IPs for the master node:

aws ec2 describe-instances --instance-id <instance-id>
{
    "Reservations": [
        {
            "Instances": [
                {
                    "PublicDnsName": "ec2-54-68-97-117.us-west-2.compute.amazonaws.com", 
                    "RootDeviceType": "ebs", 
                    "State": {
                        "Code": 16, 
                        "Name": "running"
                    }, 
                    "PublicIpAddress": "54.68.97.117", 
                    "PrivateIpAddress": "172.31.9.9", 
...

Update the node.yaml cloud-config

Edit node.yaml and replace all instances of <master-private-ip> with the private IP address of the master node.

Launch 3 worker nodes

Attention: Replace <ami_image_id> below for a suitable version of CoreOS image for AWS.

aws ec2 run-instances --count 3 --image-id <ami_image_id> --key-name <keypair> \
--region us-west-2 --security-groups kubernetes --instance-type m3.medium \
--user-data file://node.yaml

Add additional worker nodes

Attention: replace <ami_image_id> below for a suitable version of CoreOS image for AWS.

aws ec2 run-instances --count 1 --image-id <ami_image_id> --key-name <keypair> \
--region us-west-2 --security-groups kubernetes --instance-type m3.medium \
--user-data file://node.yaml

Configure the kubectl SSH tunnel

This command enables secure communication between the kubectl client and the Kubernetes API.

ssh -f -nNT -L 8080:127.0.0.1:8080 core@<master-public-ip>

Listing worker nodes

Once the worker instances have fully booted, they will be automatically registered with the Kubernetes API server by the kube-register service running on the master node. It may take a few mins.

kubectl get nodes

Starting a simple pod

Create a pod manifest: pod.json

{
  "apiVersion": "v1",
  "kind": "Pod",
  "metadata": {
    "name": "hello",
    "labels": {
      "name": "hello",
      "environment": "testing"
    }
  },
  "spec": {
    "containers": [{
      "name": "hello",
      "image": "quay.io/kelseyhightower/hello",
      "ports": [{
        "containerPort": 80,
        "hostPort": 80
      }]
    }]
  }
}

Create the pod using the kubectl command line tool

kubectl create -f pod.json

Testing

kubectl get pods

Record the Host of the pod, which should be the private IP address.

Gather the public IP address for the worker node.

aws ec2 describe-instances --filters 'Name=private-ip-address,Values=<host>'
{
    "Reservations": [
        {
            "Instances": [
                {
                    "PublicDnsName": "ec2-54-68-97-117.us-west-2.compute.amazonaws.com", 
                    "RootDeviceType": "ebs", 
                    "State": {
                        "Code": 16, 
                        "Name": "running"
                    }, 
                    "PublicIpAddress": "54.68.97.117", 
...

Visit the public IP address in your browser to view the running pod.

Delete the pod

kubectl delete pods hello

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