calshankar / terraform-aws Goto Github PK

** Requirement

• A ~/.terraformrc file on user HOME, with the path to plugin directory

• AWS Plugin module for terraform

• AWS access, secret key & SSH keys which must be setup in 'terraform.tfvars' file

• Preferable Terraform version v0.11.7

First understand plan of execution by running following command

• terraform plan --var-file="terraform.tfvars" --out plan_out

The command reads any file with extension '.tf' as for applying new or set desired state change to your infra. The plan_out file is the binary file which terraform uses to apply the infrastructure or any changes.

Apply the terraform plan on your setup by running

• terraform apply "plan_out"

This would trigger the infrastructure deployment along with a lock file on the run path to lock the config changes that you are applying. A state file is also created after successful run to record the current state before further modification to the infrastructure

To update the state of infra, just modify your original '.tf' file & repeat the step from the start without the '--out' option

• terraform plan --var-file="terraform.tfvars"

• • terraform apply --var-file="terraform.tfvars"

This would refresh the state & generate back-up file of the state file that was created from previous execution as an insurance (roll-back) before applying the modification. It will also create lock file.

• https://www.terraform.io/docs/providers/aws/

• https://www.terraform.io/docs/state/