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<h2>PLEASE NOTE: This document applies to the HEAD of the source tree</h2>

If you are using a released version of Kubernetes, you should
refer to the docs that go with that version.

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<strong>
The latest release of this document can be found
[here](http://releases.k8s.io/release-1.1/docs/getting-started-guides/juju.md).

Documentation for other releases can be found at
[releases.k8s.io](http://releases.k8s.io).
</strong>
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Getting started with Juju
-------------------------

[Juju](https://jujucharms.com/docs/stable/about-juju) makes it easy to deploy
Kubernetes by provisioning, installing and configuring all the systems in
the cluster.  Once deployed the cluster can easily scale up with one command
to increase the cluster size.


**Table of Contents**

- [Prerequisites](#prerequisites)
   - [On Ubuntu](#on-ubuntu)
   - [With Docker](#with-docker)
- [Launch Kubernetes cluster](#launch-kubernetes-cluster)
- [Exploring the cluster](#exploring-the-cluster)
- [Run some containers!](#run-some-containers)
- [Scale out cluster](#scale-out-cluster)
- [Launch the "k8petstore" example app](#launch-the-k8petstore-example-app)
- [Tear down cluster](#tear-down-cluster)
- [More Info](#more-info)
    - [Cloud compatibility](#cloud-compatibility)


## Prerequisites

> Note: If you're running kube-up, on Ubuntu - all of the dependencies
> will be handled for you. You may safely skip to the section:
> [Launch Kubernetes Cluster](#launch-kubernetes-cluster)

### On Ubuntu

[Install the Juju client](https://jujucharms.com/get-started) on your
local Ubuntu system:

    sudo add-apt-repository ppa:juju/stable
    sudo apt-get update
    sudo apt-get install juju-core juju-quickstart juju-deployer


### With Docker

If you are not using Ubuntu or prefer the isolation of Docker, you may
run the following:

    mkdir ~/.juju
    sudo docker run -v ~/.juju:/home/ubuntu/.juju -ti jujusolutions/jujubox:latest

At this point from either path you will have access to the `juju
quickstart` command.

To set up the credentials for your chosen cloud run:

    juju quickstart --constraints="mem=3.75G" -i

> The `constraints` flag is optional, it changes the size of virtual machines
> that Juju will generate when it requests a new machine.  Larger machines
> will run faster but cost more money than smaller machines.

Follow the dialogue and choose `save` and `use`.  Quickstart will now
bootstrap the juju root node and setup the juju web based user
interface.


## Launch Kubernetes cluster

You will need to export the `KUBERNETES_PROVIDER` environment variable before
bringing up the cluster.

    export KUBERNETES_PROVIDER=juju
    cluster/kube-up.sh

If this is your first time running the `kube-up.sh` script, it will install
the required dependencies to get started with Juju, additionally it will
launch a curses based configuration utility allowing you to select your cloud
provider and enter the proper access credentials.

Next it will deploy the kubernetes master, etcd, 2 nodes with flannel based
Software Defined Networking (SDN) so containers on different hosts can
communicate with each other.


## Exploring the cluster

The `juju status` command provides information about each unit in the cluster:

    $ juju status --format=oneline
    - docker/0: 52.4.92.78 (started)
      - flannel-docker/0: 52.4.92.78 (started)
      - kubernetes/0: 52.4.92.78 (started)
    - docker/1: 52.6.104.142 (started)
      - flannel-docker/1: 52.6.104.142 (started)
      - kubernetes/1: 52.6.104.142 (started)
    - etcd/0: 52.5.216.210 (started) 4001/tcp
    - juju-gui/0: 52.5.205.174 (started) 80/tcp, 443/tcp
    - kubernetes-master/0: 52.6.19.238 (started) 8080/tcp

You can use `juju ssh` to access any of the units:

    juju ssh kubernetes-master/0


## Run some containers!

`kubectl` is available on the Kubernetes master node.  We'll ssh in to
launch some containers, but one could use `kubectl` locally by setting
`KUBERNETES_MASTER` to point at the ip address of "kubernetes-master/0".

No pods will be available before starting a container:

    kubectl get pods
    NAME             READY     STATUS    RESTARTS   AGE

    kubectl get replicationcontrollers
    CONTROLLER  CONTAINER(S)  IMAGE(S)  SELECTOR  REPLICAS

We'll follow the aws-coreos example. Create a pod manifest: `pod.json`

```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 with kubectl:

    kubectl create -f pod.json


Get info on the pod:

    kubectl get pods


To test the hello app, we need to locate which node is hosting
the container. Better tooling for using Juju to introspect container
is in the works but we can use `juju run` and `juju status` to find
our hello app.

Exit out of our ssh session and run:

    juju run --unit kubernetes/0 "docker ps -n=1"
    ...
    juju run --unit kubernetes/1 "docker ps -n=1"
    CONTAINER ID        IMAGE                                  COMMAND             CREATED             STATUS              PORTS               NAMES
    02beb61339d8        quay.io/kelseyhightower/hello:latest   /hello              About an hour ago   Up About an hour                        k8s_hello....


We see "kubernetes/1" has our container, we can open port 80:

    juju run --unit kubernetes/1 "open-port 80"
    juju expose kubernetes
    sudo apt-get install curl
    curl $(juju status --format=oneline kubernetes/1 | cut -d' ' -f3)

Finally delete the pod:

    juju ssh kubernetes-master/0
    kubectl delete pods hello


## Scale out cluster

We can add node units like so:

    juju add-unit docker # creates unit docker/2, kubernetes/2, docker-flannel/2

## Launch the "k8petstore" example app

The [k8petstore example](../../examples/k8petstore/) is available as a
[juju action](https://jujucharms.com/docs/devel/actions).

    juju action do kubernetes-master/0

> Note: this example includes curl statements to exercise the app, which
> automatically generates "petstore" transactions written to redis, and allows
> you to visualize the throughput in your browser.

## Tear down cluster

    ./kube-down.sh

or destroy your current Juju environment (using the `juju env` command):

    juju destroy-environment --force `juju env`


## More Info

The Kubernetes charms and bundles can be found in the `kubernetes` project on
github.com:

 - [Bundle Repository](http://releases.k8s.io/HEAD/cluster/juju/bundles)
   * [Kubernetes master charm](../../cluster/juju/charms/trusty/kubernetes-master/)
   * [Kubernetes node charm](../../cluster/juju/charms/trusty/kubernetes/)
 - [More about Juju](https://jujucharms.com)


### Cloud compatibility

Juju runs natively against a variety of public cloud providers. Juju currently
works with [Amazon Web Service](https://jujucharms.com/docs/stable/config-aws),
[Windows Azure](https://jujucharms.com/docs/stable/config-azure),
[DigitalOcean](https://jujucharms.com/docs/stable/config-digitalocean),
[Google Compute Engine](https://jujucharms.com/docs/stable/config-gce),
[HP Public Cloud](https://jujucharms.com/docs/stable/config-hpcloud),
[Joyent](https://jujucharms.com/docs/stable/config-joyent),
[LXC](https://jujucharms.com/docs/stable/config-LXC), any
[OpenStack](https://jujucharms.com/docs/stable/config-openstack) deployment,
[Vagrant](https://jujucharms.com/docs/stable/config-vagrant), and
[Vmware vSphere](https://jujucharms.com/docs/stable/config-vmware).

If you do not see your favorite cloud provider listed many clouds can be
configured for [manual provisioning](https://jujucharms.com/docs/stable/config-manual).

The Kubernetes bundle has been tested on GCE and AWS and found to work with
version 1.0.0.


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