Terraform Kubernetes Deployment: Fundamentals

Why Should You Use Terraform for Deployment?

When you are talking about Terraform tools for deployment purposes, you may wonder why Terraform. What purpose does it serve? That’s why you should know about some of its benefits regarding deploying issues. They are

  • Observes the Relationship: Terraform can understand and establish a dependency relationship between resource and demand.
  • Immutable infrastructure: Terraform immutable provision means it can replace the current configuration with a new one and make a reprovisioned infrastructure.
  • Compatibility with the cloud: Other IaC tools work with a single cloud provider, whereas terraform can work with multiple cloud service providers. So. there will be no compatibility issues.
  • Declarative Syntax: Terraform uses the same declarative syntax for both higher and lower underlying infrastructure for provisioning.
  • Resource Management: You will not need to monitor API & identify required resources. It can track, create, update and delete those resources.
  • Open source: Terraform has a large community to provide extensions, plugins, etc. It helps to evolve Terraform with new improvements and facilities.

Terraform in Kubernetes Deployment

Terraform has cores and plugins. Providers help to support the Terraform to any virtual platform with its accessible API (Application Programming Interface). Terraform cores have compiled files in them. Every compiled file acts as a command line. And the plugins are for defining resources. And single type plugins are the providers. The working process of the core consists of three stages.

  • Writing: First, you have to create and define a configuration for deployment. Then you define resources on the cloud network with security and load balancer.
  • Planning: Terraform observes the current configuration and infrastructure situation. Then it creates a management plan of deployment for further improvement.
  • Executing: Terraform will start provisioning the infrastructure and will update the state file. This means it can even remake the cloud before scaling Kubernetes virtual machine.

Interaction of Terraform Kubernetes Provider

The best way is to create & configure the namespace, deploy apps in a pod and expose the pods for user service. We can divide these steps into three steps.

  • Configuration: First, it is essential to create a configuration file. On there, you will contain config inside it on the Terraform instance.
  • Deployment: A pod contains many containers. These nodes will run the process based on available resources. Terraform can create and serve these pods in which Kubernetes will manage the containers.
  • Exposing: Terraform will expose these pods for the user as a service. And the user can access these services. These will create loads of apps. But Terraform is capable of managing load balance with pods.

Terraform Security with Kubernetes

Terraform uses a config map to set configuration on instances. However, this is not a safe step. Terraform makes all the files and information available to the total cluster resources. This increases speed and maintains scalability. Sometimes, this information can be sensitive like passwords, and confidential information.

Terraform and Kubernetes

Provisioning the Kubernetes cluster is not easy. When you support the clusters for multiple clouds, the tasks will get more difficult. In this case, Terraform always comes in handy.

Final Verdict

The main priority of Kubernetes is container orchestration. It helps developers to schedule the deployment onto pods and nodes to manage the workloads of the computer cluster. On the other hand, Terraform works as an infrastructure tool to automate and manage IaaS, PaaS, and SaaS services. Other IaC tools create mutable infrastructure. It means they can not detect any configuration change. Terraform can provision immutable infrastructure that can detect new changes. This minimizes the possibility of making bugs. Terraform can automate the provisioning of Kubernetes and partially manage Kubernetes clusters. So, it will support efficient Kubernetes to automate the deployment process.

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Maruf Hossain

Maruf Hossain

Marketing consultant and Chief executive at SK Online Marketing