In this post, I will explain what the
terraform apply command is used for, what it does, the available options, and when to run it.
terraform apply command executes the actions proposed in a
terraform plan. It is used to deploy your infrastructure. Typically
apply should be run after
terraform init and
apply command is run without any options it will run a
terraform plan first, ask the user to confirm the planned actions, and then execute those changes once confirmed.
apply command can also be used with a previously generated planfile, from the
terraform plan -out=<path to file>.
terraform apply — Creates or updates infrastructure depending on the configuration files. By default, a plan will be generated first and will need to be approved before it is applied.
terraform apply -auto-approve — Apply changes without having to interactively type ‘yes’ to the plan. Useful in automation CI/CD pipelines.
terraform apply <planfilename> — Provide the file generated using the
terraform plan -out command. If provided, Terraform will take the actions in the plan without any confirmation prompts.
terraform apply -var="domainpassword=password123" — Pass in a variable value.
terraform apply -var-file="varfile.tfvars" — Pass in variables contained in a file.
terraform apply -target=”module.appgw.0" — Apply changes only to the targeted resource.
terraform apply -lock=false — Do not hold a state lock during the Terraform apply operation. Use with caution if other engineers might run concurrent commands against the same workspace.
terraform apply -parallelism=<n> — Specify the number of operations run in parallel.
If there are no changes in the configuration files compared to the current Terraform state, then no changes will be made to the infrastructure. Terraform is a declarative language, so it is absolutely safe to run the
apply command multiple times.
terraform apply can be run after the plan stage, passing in the plan output file. If there is no plan stage prior to the apply stage (not recommended), then the
terraform apply -auto-approve option can be used. Another useful option to avoid encoding issues when running pipelines in some CI/CD systems, i.e. Azure DevOps, is the
terraform apply -no-color option, as the colored output is not handled correctly by the build agents.
terraform apply is a core command in the Terraform workflow, used for deploying infrastructure as described in your configuration files.
For more documentation on the
terraform apply command check out the Hashicorp website.
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