In this blog post we will describe the necessary steps to get an installation of OpenShift Origin v3 up and running on OpenStack. OpenShift Origin v3 offers a ton of features over its predecessor we covered over a year ago. Most notably is the support for Docker containers and the usage of Kubernetes.
Author: Michael Erne
As mentioned in the first post about SmartDataCenter, it features various APIs. In this post we will have a look at them. Further I would like to present sdcadmin & sdc-heat, two small Python projects I have been working on. The former is a Python client library for SDCs admin APIs. The latter is an OpenStack Heat plugin that allows provisioning of SmartMachines and KVM VMs on SDC.
Joyent recently open sourced the IaaS Platform SmartDataCenter and the Object Storage Manta, the software they use for their own service offerings. So, what’s all the buzz about? Why should you be excited? Why is it even worth talking (or in this case, writing) about SDC when we have OpenStack? In this blog post I will cover some of the fundamentals of SDC and why it’s worth a second look.
In this post we take a look at Kubernetes and help you setup a Kubernetes Cluster on your existing OpenStack Cloud using its Orchestration Service Heat. This Kubernetes Cluster should only be used as a Proof of Concept.
Technology involved:
Kubernetes: https://github.com/GoogleCloudPlatform/kubernetes
CoreOS: https://coreos.com/
etcd: https://github.com/coreos/etcd
fleet: https://github.com/coreos/fleet
flannel: https://github.com/coreos/flannel
kube-register: https://github.com/kelseyhightower/kube-register
The Heat Template used in this Post is available on Github.
What is Kubernetes?
Kubernetes allows the management of docker containers at scale. Its core concepts are covered in this presentation, held at the recent OpenStack&Docker Usergroup meetups.
A complete overview of Kubernetes is found on the Kubernetes Repo.
Architecture
The provisioned Cluster consists of 5 VMs. The first one, discovery, is a dedicated etcd host. This allows easy etcd discovery thanks to a static IP-Address.
A Kubernetes Master host is setup with the Kubernetes components apiserver, scheduler, kube-register, controller-manager as well as proxy. This machine also gets a floating IP assined and acts as a access point to your Kubernetes cluster.
Three Kubernetes Minion hosts are setup with the Kubernetes components kubelet and proxy.
HowTo
Follow the instructions on the Github repo to get your Kubernetes cluster up and running:
https://github.com/icclab/kubernetes-on-openstack-demo
Examples
Two examples are provided in the repo:
- a slightly modified version of the guestbook example from the Kubernetes repo
- a simple nginx setup
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