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
<img src="images/terraform-version.png">
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
<img src="images/terraform-init.png" width="60%">
In a terminal, go into the folder where you created main.tf, and run the `terraform plan` command:
<img src="images/terraform-plan.png">
The plan command lets you see what Terraform will do before actually doing it.
To actually create the instance, run the `terraform apply` command:
<img src="images/terraform-apply.png">
<img src="images/one-vms.png">
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` <img src="images/terraform-destroy.png" width="60%">