The document discusses the development and tools used for creating Terraform modules by a tech team located across multiple countries. It outlines the structure of Terraform modules, the tools for building and testing them, and steps for publishing to the Terraform registry. Key development tools mentioned include Visual Studio Code, Git, Terraform CLI, and various automation and validation tools.

1. Ridwan Fadjar Septian
DKATALIS
Development Toolbelt for
Building Terraform Module

2. We are working from anywhere, but our main
hubs are in Jakarta and Singapore.
Our remote workers are also located in
various countries such as Malaysia,
Thailand, Vietnam, Russia, Hungary,
Ukraine, and India.
A team of tech and digital product enthusiasts,
focusing on building scalable digital solutions.

3. OUR PRODUCT
Jago
Enhance the lives of
millions with a life-centric
financial solution app.
9 million users
PX
Support and simplify
work experiences with an
interactive &
human-centric HR app

4. OUR ROLES
The mastermind behind our digital
products. They shape product
vision, craft product requirements,
make prioritizations based on
customer needs, and ensure
everyone is on the same page for a
seamless development.
The brilliant analytical minds that
unleash the power of machine
learning to drive our business
forward, consisting of Data
Scientist and Machine Learning
Engineer.
The creative force sculpting our
stunning website and app
interfaces. They're on a mission to
make customer's journey delightful
by balancing aesthetics,
innovation, and usability.
Our digital builders, crafting the
backbone of our tech environment from
websites to apps. The Principal
Engineer, Software Engineer, SRE,
Cloud Infra Engineer, Data Engineer,
and Security Engineer ensure
everything runs smoothly, scales
seamlessly, and is built to last.

5. A. What is Terraform Module?
Explaining the Terraform Module concept
5
1. Modules are containers for multiple resources that are used
together
2. A module consists of a collection of .tf and/or .tf.json files kept
together in a directory.
3. Modules are the main way to package and reuse resource
configurations with Terraform.
Source: https://developer.hashicorp.com/terraform/language/modules

6. B. Terraform Module Common Structure
Basic structure of Terraform Module
README.md
LICENSE
Modules
Examples
Quickstart, dependencies, how to use, how to contribute, etc.
License chosed by the developer
Standalone module or collection of submodules
Examples for the TF module
6

7. B. Terraform Module Common Structure (2)
Common structure for module and submodule
main.tf
outputs.tf
README.md
variables.tf
Main source code for the TF module. Usually contain resource definitions for desired
modules
Contain output for each variable you defined under the TF module
Generated by TFDocs. Usually contain the information of the submodule
Set of variables required by TF module
versions.tf Contain dependency and providers for your TF module
7

8. B. Terraform Module Common Structure (3)
Common structure for module and submodule
Source: https://github.com/ridwanbejo/terraform-cassandra-admin
8

9. B. Terraform Module Common Structure (4)
Common structure for module and submodule
Source: https://github.com/ridwanbejo/terraform-cassandra-admin
9

10. B. Terraform Module Common Structure (5)
Common structure for module and submodule
Source: https://github.com/ridwanbejo/terraform-cassandra-admin
10

11. C. Tools that can help you out
I use these tools to build and test my Terraform Modules
Text Editor
Git
Terraform CLI
Terraform
Validate
Terraform
Format
TFLint
TFSec
Pre-commit
Github Action
Docker
Docker
Compose
TFDoc
11

12. C. Tools that can help you out (1) - Text Editor
I use Visual Studio Code and Hashicorp Terraform Extension for it
12

13. C. Tools that can help you out (1) - Text Editor
I use Visual Studio Code and Hashicorp Terraform Extension for it
13

14. C. Tools that can help you out (2) - Git (and Github)
Basic commands
$ git checkout -b feature/new-branch-name
$ git branch
$ git add .
$ git commit -m “feature || new change from me”
$ git push origin feature/new-branch-name
$ git log
$ git reset –hard HEAD~1
14

15. C. Tools that can help you out (2) - Git (and Github)
Github Repo
15

16. C. Tools that can help you out (2) - Git (and Github)
Github Issue Tracker
16

17. C. Tools that can help you out (2) - Git (and Github)
Github Pull Request
17

18. C. Tools that can help you out (2) - Git (and Github)
Github Tags
18

19. C. Tools that can help you out (2) - Git (and Github)
Github Releases. And many others
19

20. C. Tools that can help you out (3) - Terraform CLI
Terraform CLI at a glance
20

21. C. Tools that can help you out (3) - Terraform CLI
Terraform CLI at a glance
21

22. C. Tools that can help you out (3) - Terraform CLI
How to install?
$ brew tap hashicorp/tap
$ brew install hashicorp/tap/terraform
Mac OS
Ubuntu / Debian
Windows
Other installation https://developer.hashicorp.com/terraform/install
$ wget -O- https://apt.releases.hashicorp.com/gpg | sudo gpg --dearmor -o
/usr/share/keyrings/hashicorp-archive-keyring.gpg
$ echo "deb [signed-by=/usr/share/keyrings/hashicorp-archive-keyring.gpg] https://apt.releases.hashicorp.com
$(lsb_release -cs) main" | sudo tee /etc/apt/sources.list.d/hashicorp.list
$ sudo apt update && sudo apt install terraform
Windows Installer
22

23. C. Tools that can help you out (4) - Terraform Validate
Output when your codebase is failed to be validated
23

24. C. Tools that can help you out (4) - Terraform Validate
When your codebase successfully validated
24

25. C. Tools that can help you out (5) - Terraform Format
Terraform Format when not detecting any formatting errors
25

26. C. Tools that can help you out (5) - Terraform Format
Terraform Format when found errors
26

27. C. Tools that can help you out (5) - Terraform Format
Terraform Format when found errors
27

28. C. Tools that can help you out (5) - Terraform Format
Terraform Format when found errors
28

29. C. Tools that can help you out (5) - Terraform Format
Terraform Format when found errors
29

30. C. Tools that can help you out (6) - TFSec
If you work with AWS, GCP, Azure, Kubernetes and others. You can use TFSec if the cloud is supported by TFSec
Checks
Sources:
- https://github.com/aquasecurity/tfsec
- https://aquasecurity.github.io/tfsec/latest/guides/trivy/
30

31. C. Tools that can help you out (6) - TFSec
If you work with AWS, GCP, Azure, Kubernetes and others. You can use TFSec if the cloud is supported by TFSec
Checks
Sources:
- https://github.com/aquasecurity/tfsec
- https://aquasecurity.github.io/tfsec/latest/guides/trivy/
31

32. C. Tools that can help you out (6) - TFSec
If you work with AWS, GCP, Azure, Kubernetes and others. You can use TFSec if the cloud is supported by TFSec
Checks
Sources:
- https://github.com/aquasecurity/tfsec
- https://aquasecurity.github.io/tfsec/latest/guides/trivy/
32

33. C. Tools that can help you out (7) - Terraform Docs
Generate docs for your Terraform code automatically
Source: https://terraform-docs.io/user-guide/introduction/
33

34. C. Tools that can help you out (7) - Terraform Docs
Generate docs for your Terraform code automatically
Source: https://terraform-docs.io/user-guide/introduction/
34

35. C. Tools that can help you out (8) - Pre-commit
You can think pre-commit is local CI pipeline which triggered when attempting to commit your changes
35
Source: https://pre-commit.com/

36. C. Tools that can help you out (8) - Pre-commit
You can think pre-commit is local CI pipeline which triggered when attempting to commit your changes
36
Source: https://pre-commit.com/

37. C. Tools that can help you out (9) - Docker & Docker-Compose
Use Docker and Docker-Compose to prepare your sandbox for local development
37

38. C. Tools that can help you out (9) - Docker & Docker-Compose
Use Docker and Docker-Compose to prepare your sandbox for local development
38

39. C. Tools that can help you out (9) - Docker & Docker-Compose
Use Docker and Docker-Compose to prepare your sandbox for local development
39

40. C. Tools that can help you out (9) - Docker & Docker-Compose
Use Docker and Docker-Compose to prepare your sandbox for local development
40

41. C. Tools that can help you out (10) - Github Action
CI Pipeline for your Terraform
41

42. C. Tools that can help you out (10) - Github Action
CI Pipeline for your Terraform
42

43. C. Tools that can help you out (10) - Github Action
CI Pipeline for your Terraform
43

44. C. Tools that can help you out (10) - Github Action
CI Pipeline for your Terraform
44

45. C. Tools that can help you out (10) - Github Action
CI Pipeline for your Terraform
45

46. C. Tools that can help you out (10) - Github Action
CI Pipeline for your Terraform
46

47. C. Tools that can help you out (10) - Github Action
CI Pipeline for your Terraform
47

48. C. Tools that can help you out (11) - TFLint
This tool have ruleset for terraform, aws, azure and gcp. It has more ruleset. I’m still exploring this tool too.
source: https://github.com/terraform-linters/tflint
48

49. C. Tools that can help you out (11) - TFLint
This tool have ruleset for terraform, aws, azure and gcp. It has more ruleset. I’m still exploring this tool too.
source: https://github.com/terraform-linters/tflint
49

50. C. Tools that can help you out (12) - Terraform Test
Test feature that seems like unit test in certain programming languages. I’m still exploring this tool too.
Source: https://developer.hashicorp.com/terraform/language/v1.7.x/tests#syntax
50

51. D. Testing the TF Module locally
Test the TF Cassandra module locally - setup providers.tf with localhost Cassandra
51

52. D. Testing the TF Module locally (2)
Test the TF Cassandra module locally - terraform.tfvars
52

53. D. Testing the TF Module locally (3)
Test the TF Cassandra module locally - terraform plan
53

54. D. Testing the TF Module locally (3)
Test the TF Cassandra module locally - terraform apply -auto-approve
54

55. D. Testing the TF Module locally (3)
Test the TF Cassandra module locally - terraform apply result
55

56. D. Testing the TF Module locally (4)
Test the TF Cassandra module locally - terraform destroy
56

57. D. Testing the TF Module locally (5)
Test the TF Cassandra module locally - terraform destroy result
57

58. E. Publish the TF Module to Terraform Registry
Create new tags and draft new release
58

59. E. Publish the TF Module to Terraform Registry (2)
New release ready, go to Terraform Registry page
59

60. E. Publish the TF Module to Terraform Registry (3)
Login to Terraform Registry with your Github Account
60

61. E. Publish the TF Module to Terraform Registry (4)
If login succes, go to Profile page
61

62. E. Publish the TF Module to Terraform Registry (5)
Now you are in profile page. Let’s publish the TF module
62

63. E. Publish the TF Module to Terraform Registry (6)
Click Publish > Module menu
63

64. E. Publish the TF Module to Terraform Registry (7)
Choose repo and the targeted release. If you already published it. You will see this picture below
64

65. E. Publish the TF Module to Terraform Registry (8)
You can see the detail of Terraform Module in this kind of page
65

66. F. Summary
Recap for the tools I mentioned before
Development
Code Quality
Security
Automation
Terraform CLI, Text Editor, Git, Docker, Docker-Compose, TFDocs
Terraform Validate, Terraform Format, TFLint
TFSec
Pre-commit, Github Action
66

67. Thank you!
Q&A