Provision simple kubernetes cluster

Very simple and flat Vagrantfile + Ansible playbook to get Kubernetes multinode cluster up and running.

This scripts will help you installing and running a simple multinode Kubernetes cluster, one master node and one or several worker nodes into Centos 7 virtual machines managed by Virtual Box Hypervisor, it use vagrantfile to define all cluster nodes and use Ansible as Vagrant local provisioner, loca provisioner means you don't have to install Ansible on your host, Vagrant will install it on each virtual machine and will copy Ansible playbook into vm's to execute it locally.

Keep in mind this scripts are for educational purpouses only, Ansible playbook hasn't been optimized to be used on production environments this has just thought as a fast and easy way to get the cluster rebuilded after broken events because of my learning process about kubernetes.

1. Install Vagrant

   1. NOTE You have to use Virtual Box as your hypervisor

2. Clone this repo

3. Edit Vagrantfile to adjust cluster boxes hardware specification as shown below

BOXES = [
   {
     :name => 'kubemaster',
     :ip   => '192.168.50.120',
     :type => 'master',
     :vbox_cnf => [
         {
            '--memory' => '4096',
            '--cpus'   => '2'
         }
     ]
   },
   {
     :name => 'worker-1',
     :ip   => '192.168.50.121',
     :type => 'worker',
     :vbox_cnf => [
         {
            '--memory' => '2048',
            '--cpus'   => '1'
         }
     ]
   },
   {
     :name => 'worker-2',
     :ip   => '192.168.50.122',
     :type => 'worker',
     :vbox_cnf => [
         {
            '--memory' => '2048',
            '--cpus'   => '1'
         }
     ]
   }
]

Here some highlights has to be mentioned:

• The first box definition has to be for master node.
• :type defines ansible tags and it has to be master for kubernetes master nodes and worker for workers nodes.
• Master node has to have at least 4 gigabytes of RAM and at least 2 CPUs.
• You have to have at least one worker node definition.

4. Launch vagrant to build the cluster.

   vagrant up

5. Go out to get a coffe.

6. Enjoy your cluster 😃.