Infrastructure as Code (IaC) is changing the way that we’re doing things. Some people think that it’s the motorway that we have to follow and be aligned with business, as a resume they want us to be agile.
The arrival of tools such as Ansible, Puppet, SaltStack, and Chef, have enabled sysadmins to maintain modular, automatable infrastructure. This time I would like to introduce the Terraform tool.
Terraform is a provisioning declarative tool that is based on the Infrastructure as Code paradigm. Terraform is a multipurpose composition tool: it composes multiple tiers (SaaS/PaaS/IaaS).
Terraform is not a cloud agnostic tool, but in combination with OpenNebula, it can be amazing. By taking advantage of the template concept it will allow us to deploy vm’s agnostically in different cloud providers, such as AWS, Azure or on premise cloud infrastructure.
From the OpenNebula community we can observe several Terraform providers that have been developed. The first example is the project started by the Runtastic team that has recently been enhanced by Blackberry.
After this little introduction about Terraform, let’s go with a tutorial where a PaaS Rancher platform is deployed in an automated way with Terraform and RKE.
Deploy Rancher HA in OpenNebula with Terraform and RKE
To install Terraform, find the appropriate package for your system and download it
$ curl -O https://releases.hashicorp.com/terraform/0.11.10/terraform_0.11.10_linux_amd64.zip
After downloading Terraform, unzip the package
$ sudo mkdir /bin/terraform
$ sudo unzip terraform_0.11.10_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
You need to install go first: https://golang.org/doc/install
After go is installed and set up, just type:
$ go get github.com/blackberry/terraform-provider-opennebula $ go install github.com/blackberry/terraform-provider-opennebula
Copy your terraform-provider-opennebula binary in a folder, like
/usr/local/bin, and write this in
opennebula = "/usr/local/bin/terraform-provider-opennebula"
rke = "/usr/local/bin/terraform-provider-rke"
For RKE provider, download the binary and copy in the same folder:
$ wget https://github.com/yamamoto-febc/terraform-provider-rke/releases/download/0.5.0/terraform-provider-rke_0.5.0_linux-amd64.zip $ sudo unzip terraform-provider-rke_0.5.0_linux-amd64.zip -d /usr/local/bin/terraform-provider-rke
Clone this repo:
$ git clonehttps://github.com/CSUC/terraform-rke-paas.git
First we have to initialize Terraform simply with:
$ terraform init
We let Terraform create a plan, which we can review:
$ terraform plan
The plan command lets you see what Terraform will do before actually doing it.
Now we execute:
$ terraform apply
That’s it – you should have a functional Rancher server:
Now, you can install the Docker Machine OpenNebula Driver and deploy new Kubernetes clusters in your Rancher platform:
The complete tutorial is available at Github:
If you are interested in more details, don’t miss the talk: Hybrid Clouds: Dancing with “Automated” Virtual Machines in the next OpenNebula Conf 2018 in Amsterdam.
See you cloudadmins!
Barcelona UserGroup Team – www.cloudadmins.org