Add Kubernetes cluster example for chapter 13.

Author: geerlingguy

.travis.yml

@@ -38,6 +38,10 @@ env:
   - playbook: jenkins.yml
     distro: ubuntu1604
 
+  # TODO: Not easy to test in CI at this time.
+  # - playbook: kubernetes.yml
+  #   distro: debian9
+
   # TODO: Not easy to test in CI at this time.
   # - playbook: lamp-infrastructure.yml
   #   distro: ubuntu1604

kubernetes/README.md

@@ -0,0 +1,35 @@
+# Ansible-based Kubernetes cluster example
+
+This is an example Kubernetes cluster built and managed with Ansible. The example is explained in more detail in Chapter 13 of [Ansible for DevOps](https://www.ansiblefordevops.com/).
+
+## Quick Start Guide
+
+### 1 - Install dependencies (VirtualBox, Vagrant, Ansible)
+
+  1. Download and install [VirtualBox](https://www.virtualbox.org/wiki/Downloads).
+  2. Download and install [Vagrant](http://www.vagrantup.com/downloads.html).
+  3. [Mac/Linux only] Install [Ansible](http://docs.ansible.com/intro_installation.html).
+
+Note for Windows users: *This guide assumes you're on a Mac or Linux host. Windows hosts are unsupported at this time.*
+
+### 2 - Build the Virtual Machine
+
+  1. Download this project and put it wherever you want.
+  2. Open Terminal, cd to this directory (containing the `Vagrantfile` and this REAMDE file).
+  3. Run `ansible-galaxy install -r requirements.yml` to install required Ansible roles.
+  4. Type in `vagrant up`, and let Vagrant do its magic.
+
+Note: *If there are any errors during the course of running `vagrant up`, and it drops you back to your command prompt, just run `vagrant provision` to continue building the VM from where you left off. If there are still errors after doing this a few times, post an issue to this project's issue queue on GitHub with the error.*
+
+### 3 - Configure your host machine to access the VM.
+
+  1. [Edit your hosts file](http://www.rackspace.com/knowledge_center/article/how-do-i-modify-my-hosts-file), adding the line `192.168.84.3  cluster.k8s.test` so you can connect to the VM.
+  2. Open your browser and access [http://cluster.k8s.test](http://cluster.k8s.test).
+
+## Notes
+
+  - To shut down the virtual machine, enter `vagrant halt` in the Terminal in the same folder that has the `Vagrantfile`. To destroy it completely (if you want to save a little disk space, or want to rebuild it from scratch with `vagrant up` again), type in `vagrant destroy`.
+
+## About the Author
+
+This project was created by [Jeff Geerling](https://www.jeffgeerling.com/) as an example for [Ansible for DevOps](https://www.ansiblefordevops.com/).

kubernetes/Vagrantfile

@@ -0,0 +1,41 @@
+# -*- mode: ruby -*-
+# vi: set ft=ruby :
+
+VAGRANTFILE_API_VERSION = "2"
+
+Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
+  config.vm.box = "geerlingguy/debian9"
+  config.ssh.insert_key = false
+  config.vm.provider "virtualbox"
+
+  config.vm.provider :virtualbox do |v|
+    v.memory = 1024
+    v.cpus = 1
+    v.linked_clone = true
+  end
+
+  # Define three VMs with static private IP addresses.
+  boxes = [
+    { :name => "master", :ip => "192.168.84.2" },
+    { :name => "node1", :ip => "192.168.84.3" },
+    { :name => "node2", :ip => "192.168.84.4" },
+  ]
+
+  # Provision each of the VMs.
+  boxes.each do |opts|
+    config.vm.define opts[:name] do |config|
+      config.vm.hostname = opts[:name] + ".k8s.test"
+      config.vm.network :private_network, ip: opts[:ip]
+
+      # Provision all the VMs using Ansible after last VM is up.
+      if opts[:name] == "node2"
+        config.vm.provision "ansible" do |ansible|
+          ansible.playbook = "main.yml"
+          ansible.inventory_path = "inventory"
+          ansible.limit = "all"
+        end
+      end
+    end
+  end
+
+end