How To Debug Terraform

Enable Terraform debug Terraform uses the value from the environment variable TF_LOG to define the LOG level. Available values are TRACE, DEBUG, INFO, WARN or ERROR. Additionally, you can specify a destination file for the log by setting the environment variable TF_LOG_PATH to the full path of the desired destination. Set the debug variables and […]

Enable Terraform debug

Terraform uses the value from the environment variable TF_LOG to define the LOG level. Available values are TRACE, DEBUG, INFO, WARN or ERROR. Additionally, you can specify a destination file for the log by setting the environment variable TF_LOG_PATH to the full path of the desired destination.

Set the debug variables and execute the Terraform plan to see the output:

$export TF_LOG=DEBUG
$# Optional export TF_LOG_PATH=~/debug.txt
$terraform plan
2020/07/31 20:19:01 [WARN] Log levels other than TRACE are currently unreliable, and are supported only for backward compatibility.
  Use TF_LOG=TRACE to see Terraform's internal logs.
  ----
2020/07/31 20:19:01 [INFO] Terraform version: 0.12.26  
2020/07/31 20:19:01 [INFO] Go runtime version: go1.12.13
2020/07/31 20:19:01 [INFO] CLI args: []string{"/usr/bin/terraform", "plan"}
2020/07/31 20:19:01 [DEBUG] Attempting to open CLI config file: /home/jruiz/.terraformrc
2020/07/31 20:19:01 [DEBUG] File doesn't exist, but doesn't need to. Ignoring.
2020/07/31 20:19:01 [INFO] CLI command args: []string{"plan"}
2020/07/31 20:19:01 [WARN] Log levels other than TRACE are currently unreliable, and are supported only for backward compatibility.
  Use TF_LOG=TRACE to see Terraform's internal logs.
  ----
2020/07/31 20:19:01 [DEBUG] New state was assigned lineage "cc420085-6d12-cb64-c041-a0ed135c58ed"
2020/07/31 20:19:01 [DEBUG] checking for provider in "."
2020/07/31 20:19:01 [DEBUG] checking for provider in "/usr/bin"
2020/07/31 20:19:01 [DEBUG] checking for provider in ".terraform/plugins/linux_amd64"
2020/07/31 20:19:01 [DEBUG] found provider "terraform-provider-aws_v2.67.0_x4"
2020/07/31 20:19:01 [DEBUG] found provider "terraform-provider-external_v1.2.0_x4"
2020/07/31 20:19:01 [DEBUG] found valid plugin: "aws", "2.67.0", "/home/jruiz/git/github/terraform-aws-ec2-rds-basic-free/.terraform/plugins/linux_amd64/terraform-provider-aws_v2.67.0_x4"
2020/07/31 20:19:01 [DEBUG] found valid plugin: "external", "1.2.0", "/home/jruiz/git/github/terraform-aws-ec2-rds-basic-free/.terraform/plugins/linux_amd64/terraform-provider-external_v1.2.0_x4"
2020/07/31 20:19:01 [DEBUG] checking for provisioner in "."
2020/07/31 20:19:01 [DEBUG] checking for provisioner in "/usr/bin"
2020/07/31 20:19:01 [DEBUG] checking for provisioner in ".terraform/plugins/linux_amd64"
2020/07/31 20:19:01 [INFO] backend/local: starting Plan operation
...
2020/07/31 20:19:30 [DEBUG] ProviderTransformer: "module.aws_sg_rds_mariadb_pro_pub_01.aws_security_group.default" (*terraform.NodeValidatableResource) needs provider.aws
6.aws_subnet.default - *terraform.NodeValidatableResource
    provider.aws - *terraform.NodeApplyableProvider
  module.aws_sn_zb_pro_pub_36.output.id - *terraform.NodeApplyableOutput
  module.aws_sn_zb_pro_pub_36.var.az - *terraform.NodeApplyableModuleVariable
  module.aws_sn_zb_pro_pub_36.var.cidr - *terraform.NodeApplyableModuleVariable
  module.aws_sn_zb_pro_pub_36.var.description - *terraform.NodeApplyableModuleVariable
  module.aws_sn_zb_pro_pub_36.var.name - *terraform.NodeApplyableModuleVariable
  module.aws_sn_zb_pro_pub_36.var.public - *terraform.NodeApplyableModuleVariable
  module.aws_sn_zb_pro_pub_36.var.vpc_id - *terraform.NodeApplyableModuleVariable
  module.aws_sr_ec2_default_internet_to_ssh.aws_security_group_rule.default - *terraform.NodeValidatableResource

....
2020/07/31 20:19:30 [DEBUG] ProviderTransformer: "module.aws_sg_rds_mariadb_pro_pub_01.aws_security_group.default" (*terraform.NodeValidatableResource) needs provider.aws
6.aws_subnet.default - *terraform.NodeValidatableResource
    provider.aws - *terraform.NodeApplyableProvider
  module.aws_sn_zb_pro_pub_36.output.id - *terraform.NodeApplyableOutput
  module.aws_sn_zb_pro_pub_36.var.az - *terraform.NodeApplyableModuleVariable
  module.aws_sn_zb_pro_pub_36.var.cidr - *terraform.NodeApplyableModuleVariable
  module.aws_sn_zb_pro_pub_36.var.description - *terraform.NodeApplyableModuleVariable
  module.aws_sn_zb_pro_pub_36.var.name - *terraform.NodeApplyableModuleVariable
  module.aws_sn_zb_pro_pub_36.var.public - *terraform.NodeApplyableModuleVariable
  module.aws_sn_zb_pro_pub_36.var.vpc_id - *terraform.NodeApplyableModuleVariable
  module.aws_sr_ec2_default_internet_to_ssh.aws_security_group_rule.default - *terraform.NodeValidatableResource
...

Inspect the Terraform State file

Use the terraform state command to inspect the current state of your infrastructure. This can help you identify any issues with resource creation or modification.

terraform state list

Use Terraform Console

The Terraform console command allows you to interactively evaluate expressions and query data from your Terraform configuration and state. Access the console and evaluate expressions or inspect resources.

terraform console
module.aws_sn_zb_pro_pub_36.var.vpc_id

Generate Terraform Infrastructure Graphs

The command is used to generate a visual representation of a configuration or an execution plan.

terraform graph | dot -Tsvg > graph.svg

Terraform Tutorials

Debug, Terraform

Table of Contents

Primary Item (H2)Sub Item 1 (H3)Sub Item 2 (H4)
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Sub Item 4 (H6)

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Javier Ruiz

IT Wonder Lab tutorials are based on the rich and diverse experience of Javier Ruiz, who founded and bootstrapped a SaaS company in the energy sector. His company, which was later acquired by a NASDAQ traded company, managed over €2 billion per year of electricity for prominent energy producers across Europe and America. Javier has more than 20 years of experience in building and managing IT companies, developing cloud infrastructure, leading cross-functional teams, and transitioning his own company from on-premises, consulting, and custom software development to a successful SaaS model that scaled globally.