DevOps Classroom Series – 13/Mar/2021

Terraform State

  • Terraform storess the state information and configuration of the infrastructure created in a terraform state file. The default location is in a file called as terraform.tfstate Preview
  • When we apply terraform from multiple workstation, it ends up creating multiple infrastructures Preview
  • Now to solve this if we try to store the terraform state in common location, then it will not result multiple unnecssary infrastructures created Preview
  • This is done by terraform backends Refer Here Preview
  • When we have multiple systems with one common state location i.e. backend then we need an approach to lock the state
  • Terraform backend should be a common location and should support locking
  • Now lets try to use aws s3 backend Refer Here
  • AWS S3 backend doesnot support locking, for locking you need to rely on one more service called as Dynamo db.
  • Now create an s3 bucket
  • For locking create a dynamodb table Preview
  • Now execute the terraform init after making changes to add terraform backend Refer Here for the changeset Preview
  • Now lets apply , whenever we apply terraform tries to acquire the lock from the backend in this case from dynamo db and stores the state in the specified s3 bucket
  • Lets consider the below scenario Preview
  • Now DevOps engineer on laptop1 needs to create dev environment
  • Devops Engineer on laptop2 needs to create test environment
  • How can we use one template to create various environments?
    • Terraform supports workspaces for this
    • Terraform supports workspaces by a special commandline
    terraform workspace
    Preview Preview
  • In terraform there is always a workspace called as default
  • Now lets make necessary changes Refer Here
  • execute terraform init Preview
  • Lets create a new workspace called as Developer Preview
  • Lets create one more workspace called as QA
  • Now make small changes to reflect the workspace Refer Here
  • Now lets select developer workspace Preview
  • Now lets apply to create resources Preview Preview
  • Now lets select QA workspace and apply the resources Preview Preview
  • If you one template and you need to create multiple environments using a combination of backend + workspace is ideal.
  • Break till 8:00

Realizing archtitecture in Azure

  • Lets try to create a similar architecture in Azure Preview
  • To create an infra in azure we need use terraform azure provider Refer Here
  • Install azure cli Refer Here
  • Now execute az login and enter your credentials
  • now execute terraform init Preview
  • make a note of manual steps
    • create a resource group
    • create a virtual network
    • create a network security group
    • create a storage account
    • create a nic
    • create virtual machine Preview
  • Resource group Refer Here
  • Refer Here for the changeset
  • Now lets try to apply Preview
  • Lets add features Refer Here and reapply
  • Lets correct region Refer Here Preview Preview
  • Now lets add a virtual network Refer Here Preview
  • for subnet Refer Here
  • Refer Here for the changeset Preview Preview
  • Now lets try to create a network security group for web which opens all the ssh, http connection Refer Here
  • Refer Here for the changeset and apply Preview Preview
  • Now lets create a public ip address Refer Here
  • After public ip address we need to create the network interface card where you specify subnet, public ip and nsg Refer Here
  • Refer Here for the changeset Preview
  • Now we need to create a storage account for storing diagnostics information Refer Here
  • Now we need to create vm Refer Here
  • Refer Here for the changeset Preview
  • For using terraform with Azure Refer Here
  • For using azurerm backend Refer Here
  • In the terraform vm we can use provisioning to login and install/deploy
  • For using terraform with GCP Refer Here

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