Terraform Lessons

Example of using Terraform with github

To start creating things with Terraform, we need to define resources. ANything infra as code is a resource in terraform.
In this example, github repo is a resource. https://registry.terraform.io/providers/integrations/github/latest/docs
The resource type and name act together as unique identifier.

terraform {
    required_providers {
	github = {
	    source = "integrtations/github"
	    version = "~> 5.0"

	}
    }
}

# Configure  the Github provider
#provider "github" {
#    token = "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"
#}

# More secure way to provide the token in env variable
provider = "github" {}

Terraform cloud provides:
- state storage
- remote execution (execution from cloud)
- includes secret storage
Terraform is an online service. Terraform stores the configuration as

series of files and these files create modules.

State is a DB usually stored as file locally or can be part of remote backend which is S3 or Terraform cloud or GCS.
State file is the view of the world for Terraform. It does not check what exists in cloud provider, but looks at the state file.
Terraform compares what the user wants (config file) against what exists in the state file and reconcile the diff.

## Installation

Install terraform executable
Install docker image by docker run hashicorp/terraform:latest

Commands: There are around 12 to 15 commands.

Step 1: init:

downloads terraform providers or make sure they exist.
It also ensures module availability
provider is interface for individual cloud services.

Step 2: plan:

Compares config file settings against state.
The output is the detailed plan of what terraform is going to do.
A plan file is created and used in step 3 “apply”.

Step 3: apply:

applies the suggested plan using the plan file.

fmt
- terraform formats the config file to standarized format.
graph
- visualizes the dependency tree.
import
- allows to bring the resources that were created outside terraform
output
- display on the screen any output configured in terraform.
refresh
- Update local state file against real resources and useful if there is any drfit.
show
- info. about state and plan file
workspace
- alternative state of the state file…common use is dev, stage, production workspaces.

kubernetes Commands Reference

To health check kubernetes cluster

kubectl cluster-info

To view all the nodes in kubernetes cluster

kubectl get nodes

To view all pods in the kubernetes cluster

kubectl get pods –all-namespaces

To view all local containers

crictl ps

To ssh to second node

ssh node01

Dataiku Concepts

Quiz, Dataiku

Last updated on Aug 17, 2023

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