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275 lines
8.6 KiB
Markdown
275 lines
8.6 KiB
Markdown
<!-- BEGIN MUNGE: UNVERSIONED_WARNING -->
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<!-- BEGIN STRIP_FOR_RELEASE -->
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<img src="http://kubernetes.io/img/warning.png" alt="WARNING"
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width="25" height="25">
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<img src="http://kubernetes.io/img/warning.png" alt="WARNING"
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width="25" height="25">
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<img src="http://kubernetes.io/img/warning.png" alt="WARNING"
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width="25" height="25">
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<img src="http://kubernetes.io/img/warning.png" alt="WARNING"
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width="25" height="25">
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<img src="http://kubernetes.io/img/warning.png" alt="WARNING"
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width="25" height="25">
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<h2>PLEASE NOTE: This document applies to the HEAD of the source tree</h2>
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If you are using a released version of Kubernetes, you should
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refer to the docs that go with that version.
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<!-- TAG RELEASE_LINK, added by the munger automatically -->
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<strong>
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The latest release of this document can be found
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[here](http://releases.k8s.io/release-1.1/docs/getting-started-guides/juju.md).
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Documentation for other releases can be found at
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[releases.k8s.io](http://releases.k8s.io).
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</strong>
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--
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<!-- END STRIP_FOR_RELEASE -->
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<!-- END MUNGE: UNVERSIONED_WARNING -->
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Getting started with Juju
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-------------------------
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[Juju](https://jujucharms.com/docs/stable/about-juju) makes it easy to deploy
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Kubernetes by provisioning, installing and configuring all the systems in
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the cluster. Once deployed the cluster can easily scale up with one command
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to increase the cluster size.
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**Table of Contents**
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- [Prerequisites](#prerequisites)
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- [On Ubuntu](#on-ubuntu)
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- [With Docker](#with-docker)
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- [Launch Kubernetes cluster](#launch-kubernetes-cluster)
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- [Exploring the cluster](#exploring-the-cluster)
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- [Run some containers!](#run-some-containers)
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- [Scale out cluster](#scale-out-cluster)
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- [Launch the "k8petstore" example app](#launch-the-k8petstore-example-app)
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- [Tear down cluster](#tear-down-cluster)
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- [More Info](#more-info)
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- [Cloud compatibility](#cloud-compatibility)
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## Prerequisites
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> Note: If you're running kube-up, on Ubuntu - all of the dependencies
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> will be handled for you. You may safely skip to the section:
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> [Launch Kubernetes Cluster](#launch-kubernetes-cluster)
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### On Ubuntu
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[Install the Juju client](https://jujucharms.com/get-started) on your
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local Ubuntu system:
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sudo add-apt-repository ppa:juju/stable
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sudo apt-get update
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sudo apt-get install juju-core juju-quickstart
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### With Docker
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If you are not using Ubuntu or prefer the isolation of Docker, you may
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run the following:
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mkdir ~/.juju
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sudo docker run -v ~/.juju:/home/ubuntu/.juju -ti jujusolutions/jujubox:latest
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At this point from either path you will have access to the `juju
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quickstart` command.
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To set up the credentials for your chosen cloud run:
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juju quickstart --constraints="mem=3.75G" -i
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> The `constraints` flag is optional, it changes the size of virtual machines
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> that Juju will generate when it requests a new machine. Larger machines
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> will run faster but cost more money than smaller machines.
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Follow the dialogue and choose `save` and `use`. Quickstart will now
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bootstrap the juju root node and setup the juju web based user
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interface.
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## Launch Kubernetes cluster
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You will need to export the `KUBERNETES_PROVIDER` environment variable before
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bringing up the cluster.
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export KUBERNETES_PROVIDER=juju
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cluster/kube-up.sh
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If this is your first time running the `kube-up.sh` script, it will install
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the required dependencies to get started with Juju, additionally it will
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launch a curses based configuration utility allowing you to select your cloud
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provider and enter the proper access credentials.
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Next it will deploy the kubernetes master, etcd, 2 nodes with flannel based
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Software Defined Networking (SDN) so containers on different hosts can
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communicate with each other.
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## Exploring the cluster
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The `juju status` command provides information about each unit in the cluster:
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$ juju status --format=oneline
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- docker/0: 52.4.92.78 (started)
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- flannel-docker/0: 52.4.92.78 (started)
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- kubernetes/0: 52.4.92.78 (started)
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- docker/1: 52.6.104.142 (started)
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- flannel-docker/1: 52.6.104.142 (started)
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- kubernetes/1: 52.6.104.142 (started)
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- etcd/0: 52.5.216.210 (started) 4001/tcp
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- juju-gui/0: 52.5.205.174 (started) 80/tcp, 443/tcp
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- kubernetes-master/0: 52.6.19.238 (started) 8080/tcp
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You can use `juju ssh` to access any of the units:
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juju ssh kubernetes-master/0
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## Run some containers!
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`kubectl` is available on the Kubernetes master node. We'll ssh in to
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launch some containers, but one could use `kubectl` locally by setting
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`KUBERNETES_MASTER` to point at the ip address of "kubernetes-master/0".
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No pods will be available before starting a container:
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kubectl get pods
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NAME READY STATUS RESTARTS AGE
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kubectl get replicationcontrollers
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CONTROLLER CONTAINER(S) IMAGE(S) SELECTOR REPLICAS
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We'll follow the aws-coreos example. Create a pod manifest: `pod.json`
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```json
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{
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"apiVersion": "v1",
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"kind": "Pod",
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"metadata": {
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"name": "hello",
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"labels": {
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"name": "hello",
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"environment": "testing"
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}
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},
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"spec": {
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"containers": [{
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"name": "hello",
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"image": "quay.io/kelseyhightower/hello",
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"ports": [{
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"containerPort": 80,
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"hostPort": 80
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}]
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}]
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}
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}
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```
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Create the pod with kubectl:
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kubectl create -f pod.json
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Get info on the pod:
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kubectl get pods
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To test the hello app, we need to locate which node is hosting
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the container. Better tooling for using Juju to introspect container
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is in the works but we can use `juju run` and `juju status` to find
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our hello app.
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Exit out of our ssh session and run:
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juju run --unit kubernetes/0 "docker ps -n=1"
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...
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juju run --unit kubernetes/1 "docker ps -n=1"
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CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
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02beb61339d8 quay.io/kelseyhightower/hello:latest /hello About an hour ago Up About an hour k8s_hello....
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We see "kubernetes/1" has our container, we can open port 80:
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juju run --unit kubernetes/1 "open-port 80"
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juju expose kubernetes
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sudo apt-get install curl
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curl $(juju status --format=oneline kubernetes/1 | cut -d' ' -f3)
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Finally delete the pod:
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juju ssh kubernetes-master/0
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kubectl delete pods hello
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## Scale out cluster
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We can add node units like so:
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juju add-unit docker # creates unit docker/2, kubernetes/2, docker-flannel/2
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## Launch the "k8petstore" example app
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The [k8petstore example](../../examples/k8petstore/) is available as a
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[juju action](https://jujucharms.com/docs/devel/actions).
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juju action do kubernetes-master/0
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> Note: this example includes curl statements to exercise the app, which
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> automatically generates "petstore" transactions written to redis, and allows
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> you to visualize the throughput in your browser.
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## Tear down cluster
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./kube-down.sh
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or destroy your current Juju environment (using the `juju env` command):
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juju destroy-environment --force `juju env`
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## More Info
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The Kubernetes charms and bundles can be found in the `kubernetes` project on
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github.com:
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- [Bundle Repository](http://releases.k8s.io/HEAD/cluster/juju/bundles)
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* [Kubernetes master charm](../../cluster/juju/charms/trusty/kubernetes-master/)
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* [Kubernetes node charm](../../cluster/juju/charms/trusty/kubernetes/)
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- [More about Juju](https://jujucharms.com)
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### Cloud compatibility
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Juju runs natively against a variety of public cloud providers. Juju currently
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works with [Amazon Web Service](https://jujucharms.com/docs/stable/config-aws),
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[Windows Azure](https://jujucharms.com/docs/stable/config-azure),
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[DigitalOcean](https://jujucharms.com/docs/stable/config-digitalocean),
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[Google Compute Engine](https://jujucharms.com/docs/stable/config-gce),
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[HP Public Cloud](https://jujucharms.com/docs/stable/config-hpcloud),
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[Joyent](https://jujucharms.com/docs/stable/config-joyent),
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[LXC](https://jujucharms.com/docs/stable/config-LXC), any
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[OpenStack](https://jujucharms.com/docs/stable/config-openstack) deployment,
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[Vagrant](https://jujucharms.com/docs/stable/config-vagrant), and
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[Vmware vSphere](https://jujucharms.com/docs/stable/config-vmware).
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If you do not see your favorite cloud provider listed many clouds can be
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configured for [manual provisioning](https://jujucharms.com/docs/stable/config-manual).
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The Kubernetes bundle has been tested on GCE and AWS and found to work with
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version 1.0.0.
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<!-- BEGIN MUNGE: GENERATED_ANALYTICS -->
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[]()
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<!-- END MUNGE: GENERATED_ANALYTICS -->
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