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kubernetes-coreos-terraform

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Simple Kubernetes cluster on CoreOS in AWS using Terraform

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# Kubernetes on CoreOS in AWS using Terraform

Provision a [Kubernetes](http://kubernetes.io) cluster with [Terraform](https://www.terraform.io) on AWS.

Inspired by [kubestack](https://github.com/kelseyhightower/kubestack)

## Status

This is no longer maintained. All the versions are old. Feel free to use this to inspire you.

## Prep
- [Install Terraform](https://www.terraform.io/intro/getting-started/install.html)

## Terraform

Terraform will be used to declare and provision a Kubernetes cluster.

## Prep

Create a `terraform.tfvars` file in the top-level directory of the repo with content like:

```
ssh_key_name = name_of_my_key_pair_in_AWS
access_key = my_AWS_access_key
secret_key = my_AWS_secret_key
```

This file is ignored by git.  You can also set these by using [environment variables](https://www.terraform.io/docs/configuration/variables.html).

You also need to make sure you are running ssh-agent and have your AWS key added.

### Usage

This repo includes a very simple [Makefile](./Makefile) that will handle generating an etcd [discovery token](https://coreos.com/docs/cluster-management/setup/cluster-discovery/).

To create the cluster, run `make apply`

To destroy the cluster, run `make destroy`

You can override any variables listed in [variables.tf](./variables.tf) such as the ami to use, number of nodes, etc

## Next Steps

When you create a cluster, it will output something like:

```
Outputs:
  kubernetes-api-server =
# Use these commands to configure kubectl
kubectl config set-cluster testing --insecure-skip-tls-verify=true --server=IP
kubectl config set-credentials admin --token='4c98e411'
kubectl config set-context testing --cluster= testing --user=admin
kubectl config use-context testing
```

Run these commands to configure `kubectl`.  You can see these commands again by running `terraform output kubernetes-api-server`

Test this by running `kubectl get nodes`

You should now be able to use `kubectl` to create services. See the [kubernetes examples](https://github.com/GoogleCloudPlatform/kubernetes/tree/master/examples) to get started.

## TODO

## Differences from kubestack

Most of the differences are based on my personal opionions and/or just
trying a different approach.

- We use base CoreOS image and install Kubernetes at boot time.  This
  was originally to skip the "build image, upload, test, repeat" cycle
  during development, but it does expose the install process more
  clearly.
- We use etcd in proxy mode on the master and workers rather than
   pointing directly to etcd servers.

kubernetes-coreos-terraform

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