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| layout | page_title | sidebar_current | description |
|---|---|---|---|
| docs | Environment Variables | docs-config-environment-variables | Terraform uses different environment variables that can be used to configure various aspects of how Terraform behaves. this section documents those variables, their potential values, and how to use them. |
Environment Variables
TF_LOG
If set to any value, enables detailed logs to appear on stderr which is useful for debugging. For example:
export TF_LOG=TRACE
To disable, either unset it or set it to empty. When unset, logging will default to stderr. For example:
export TF_LOG=
For more on debugging Terraform, check out the section on Debugging.
TF_LOG_PATH
This specifies where the log should persist its output to. Note that even when TF_LOG_PATH is set, TF_LOG must be set in order for any logging to be enabled. For example, to always write the log to the directory you're currently running terraform from:
export TF_LOG_PATH=./terraform.log
For more on debugging Terraform, check out the section on Debugging.
TF_INPUT
If set to "false" or "0", causes terraform commands to behave as if the -input=false flag was specified. This is used when you want to disable prompts for variables that haven't had their values specified. For example:
export TF_INPUT=0
TF_MODULE_DEPTH
When given a value, causes terraform commands to behave as if the -module=depth=VALUE flag was specified. By setting this to 0, for example, you enable commands such as plan and graph to display more compressed information.
export TF_MODULE_DEPTH=0
For more information regarding modules, check out the section on Using Modules.
TF_VAR_name
Environment variables can be used to set variables. The environment variables must be in the format TF_VAR_name and this will be checked last for a value. For example:
export TF_VAR_region=us-west-1
export TF_VAR_ami=ami-049d8641
For more on how to use TF_VAR_name in context, check out the section on Variable Configuration.