Create AWS Step Function and Lambda using Terraform and GitLab CI

Install Terraform

• Download Terraform binary and unzip the package.

• Set terraform path to unzipped binary location. Terraform runs as a single binary named terraform. Any other files in the package can be safely removed and Terraform will still function.

• Verify the setup by using command terraform version in CLI.

Install AWS CLI

• Download and run the AWS CLI MSI installer for Windows (64-bit):

• To confirm the installation, open the Start menu, search for cmd to open a command prompt window, and at the command prompt use the aws --version command.

Build a infrastructure

• Create a directory for your configuration  mkdir terraform
• Change the directory and create a file main.tf.

• Initialize the directory with terraform init.

• Run terraform plan to see any changes are required for infrastructure.
• Format and validate the configuration
• Apply the configuration now with the terraform apply command.

Configuring Gitlab CI for Terraform

• Create a file on the root of your repository called .gitlab-ci.yml
• Get your access key ID and secret access key.
• Set aws variables go to - gitlab project → settings → CI/CD → Variables

Sample GitLab pipeline

stages: - validate - plan - apply - destroy image: name: hashicorp/terraform:light entrypoint: - '/usr/bin/env' - 'PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin' before_script: - export AWS_ACCESS_KEY=${AWS_ACCESS_KEY_ID} - export AWS_SECRET_ACCESS_KEY=${AWS_SECRET_ACCESS_KEY} - rm -rf .terraform - cd terraform/ - terraform --version - terraform init validate: stage: validate script: - terraform validate only: - branches plan: stage: plan script: - terraform plan -out "planfile" dependencies: - validate artifacts: paths: - planfile apply: stage: apply script: - terraform apply -input=false "planfile" dependencies: - plan when: manual only: - main destroy: stage: destroy script: - echo "Destroying resources" - terraform destroy -state=$STATE --auto-approve dependencies: - apply when: manual only: refs: - main 

Sample terraform code for lambda and step function