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Installing Terraform

To install Terraform, find the appropriate package for your system and download it

$ curl -O https://releases.hashicorp.com/terraform/0.11.4/terraform_0.11.4_linux_amd64.zip

After downloading Terraform, unzip the package

$ sudo mkdir /bin/terraform
$ sudo unzip terraform_0.11.4_linux_amd64.zip -d /bin/terraform


After installing Terraform, verify the installation worked by opening a new terminal session and checking that terraform is available.

$ export PATH=$PATH:/bin/terraform
$ terraform --version


Installing Terraform provider Opennebula

You need to install go first: https://golang.org/doc/install

Install Prerequisites

$ sudo apt install bzr

Use the `wget` command and the link from Go to download the tarball:

$ wget https://dl.google.com/go/go1.10.linux-amd64.tar.gz


The installation of Go consists of extracting the tarball into the `/usr/local`

$ sudo tar -C /usr/local -xvzf  go1.10.linux-amd64.tar.gz 


We will call our workspace directory projects, but you can name it anything you would like. The `-p` flag for the `mkdir` command will create the appropriate directory tree

$ mkdir -p ~/projects/{bin,pkg,src}

 
To execute Go like any other command, we need to append its install location to the $PATH variable.

$ export PATH=$PATH:/usr/local/go/bin


Additionally, define the GOPATH and GOBIN Go environment variables:

$ export GOBIN="$HOME/projects/bin"
$ export GOPATH="$HOME/projects/src"


After go is installed and set up, just type:

$ go get github.com/runtastic/terraform-provider-opennebula
$ go install github.com/runtastic/terraform-provider-opennebula


Optional post-installation Step


Copy your **terraform-provider-opennebula** binary in a folder, like `/usr/local/bin`, and write this in `~/.terraformrc`:

 $ sudo cp ~/projects/bin/terraform-provider-opennebula /usr/local/bin/terraform-provider-opennebula
providers {
  opennebula = "$YOUR_PROVIDER_PATH"
}


Example for `/usr/local/bin`:

providers { 
 opennebula = "/usr/local/bin/terraform-provider-opennebula"
}

Install Ansible

We can add the Ansible PPA by typing the following command:

$ sudo apt-add-repository ppa:ansible/ansible

Next, we need to refresh our system's package index so that it is aware of the packages available in the PPA. Afterwards, we can install the software:
  

$ sudo apt-get update
$ sudo apt-get install ansible

Deploy a Kubernetes cluster


Terraform code is written in a language called HCL in files with the extension “.tf”. It is a declarative language, so your goal is to describe the infrastructure you want, and Terraform will figure out how to create it.

This repository provide an Ansible playbook to Build a Kubernetes cluster with kubeadm. The goal is easily install a Kubernetes cluster on machines running `CentOS 7`
   

$ git clone https://github.com/CSUC/terransible-kubernetes-cluster 

  
First, initialize Terraform for your project. This will read your configuration files and install the plugins for your provider:
  

$ terraform init




In a terminal, go into the folder where you created main.tf, and run the `terraform plan` command:



The plan command lets you see what Terraform will do before actually doing it.

To actually create the instance, run the `terraform apply` command:





You can access Dashboard using the kubectl command-line tool by running the following command:
   

$ kubectl proxy --address $MASTER_IP --accept-hosts='^*$'

The last step is to complete the cluster life cycle by removing your resources, do: `terraform destroy`
 

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