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Getting started on AWS

The cluster is provisioned in separate stages as follows:

  • Terraform to provision the cluster instances, security groups, firewalls, cloud infrastructure and security (SSL) certificates.
  • Ansible to configure the cluster, including installing Kubernetes, addons and platform level configuration (files, directories etc...)

Prerequisites

  1. You need an AWS account. Visit http://aws.amazon.com to get started
  2. You need an AWS instance profile and role with EC2 full access.
  3. You need to have installed and configured Terraform (>= 0.7.11 required). Visit https://www.terraform.io/intro/getting-started/install.html to get started.
  4. You need to have Python >= 2.7.5 installed along with pip.
  5. Kubectl installed in and your PATH:
curl -O https://storage.googleapis.com/kubernetes-release/release/v1.2.4/bin/linux/amd64/kubectl

On an OS X workstation, replace linux in the URL above with darwin:

curl -O https://storage.googleapis.com/kubernetes-release/release/v1.2.4/bin/darwin/amd64/kubectl

After downloading the binary, ensure it is executable and move it into your PATH:

chmod +x kubectl
mv kubectl /usr/local/bin/kubectl

## Cluster Turnup

### Download Kubeform (install from source at head)

git clone https://github.com/Capgemini/kubeform.git /tmp/kubeform
cd /tmp/kubeform
pip install -r requirements.txt

### Set config

Configuration can be set via environment variables. As a minimum you will need to set these environment variables:

export TF_VAR_access_key=$AWS_ACCESS_KEY_ID
export TF_VAR_secret_key=$AWS_SECRET_ACCESS_KEY
export TF_VAR_STATE_ROOT=/tmp/kubeform/terraform/aws/public-cloud

### Get terraform dependencies

cd /tmp/kubeform/terraform/aws/public-cloud
terraform get
for i in $(ls .terraform/modules/*/Makefile); do i=$(dirname $i); make -C $i; done

Provision the cluster infrastructure

terraform apply

### Configure the cluster

To install the role dependencies for Ansible execute:

cd /tmp/kubeform
ansible-galaxy install -r requirements.yml

To run the Ansible playbook (to configure the cluster):

ansible-playbook -u core --ssh-common-args="-i /tmp/kubeform/terraform/aws/public-cloud/id_rsa -q" --inventory-file=inventory site.yml -e kube_apiserver_vip=$(cd /tmp/kubeform/terraform/aws/public-cloud && terraform output master_elb_hostname)

This will run the playbook (using the credentials output by terraform and the terraform state as a dynamic inventory) and inject the AWS ELB (for the master API servers) address as a variable kube_apiserver_vip.

## Cluster Destroy

cd /tmp/kubeform/terraform/aws/public-cloud
terraform destroy