commit ddfb8888d5177be5ea8fb2dc181724e4d2bfd8ff
Author: Patrick de Ruiter <pderuiter@bsdserver.nl>
Date:   Sat Nov 1 10:19:32 2025 +0100

    Add comprehensive README and update module documentation

diff --git a/README.md b/README.md
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+# Terraform AWS Jenkins Module
+
+## Overview
+
+The `terraform-aws-jenkins` module provisions a Jenkins CI/CD infrastructure on AWS with auto-scaling capabilities, load balancing, and persistent storage support.
+
+⚠️ **WARNING**: This module is currently in an incomplete state and requires additional development before production use.
+
+## Intended Features
+
+- Jenkins master server on EC2
+- Auto Scaling Group for high availability
+- Elastic Load Balancer for traffic distribution
+- Persistent EBS volume for Jenkins data
+- SSL/TLS support via ACM certificates
+- Placement group for optimized network performance
+
+## Current Status
+
+### Known Issues
+
+This module contains several implementation issues that need to be resolved:
+
+1. **Syntax Errors**:
+   - Incorrect variable interpolation syntax
+   - Malformed resource references
+
+2. **Missing Resources**:
+   - Placement group resource not defined
+   - Launch configuration resource not defined
+   - Subnet resources referenced but not created
+   - Security group configuration missing
+
+3. **Missing Outputs**:
+   - No outputs.tf file
+   - Load Balancer DNS, Auto Scaling Group details not exposed
+
+4. **Hardcoded Values**:
+   - Environment-specific values embedded (region, AMI ID, volume ID)
+   - Domain-specific Jenkins URL
+
+### Resources (Partial Implementation)
+
+The module attempts to create:
+
+- **AWS Auto Scaling Group** - Single instance configuration
+- **AWS Placement Group** (referenced, not defined)
+- **AWS Launch Configuration** (referenced, not defined)
+- **AWS Elastic Load Balancer** (implied by health check)
+- **AWS EBS Volume** (referenced, not created)
+
+## Variables
+
+| Variable | Type | Default | Description |
+|----------|------|---------|-------------|
+| `project` | string | Required | Project name |
+| `env` | string | Required | Environment/Stage identifier |
+| `jenkins_version` | string | `""` | Version of Jenkins to install |
+| `jenkins_url` | string | `stg-jenkins.build.edubase.malmberg.nl` | Jenkins URL |
+| `loadbalancer_name` | string | `stg-jenkins` | ELB name |
+| `loadbalancer_certificate` | string | `arn:aws:acm:...` | ACM certificate ARN for HTTPS |
+| `ami_id` | string | `ami-03a779dec4508895a` | AMI ID for Jenkins instance |
+| `instance_type` | string | `c5.xlarge` | EC2 instance type |
+| `persistent_volume_id` | string | `vol-03dde8c1fabe3de46` | EBS volume ID for persistence |
+
+## Prerequisites
+
+- Existing VPC with subnets
+- Pre-existing ACM SSL certificate
+- Pre-existing EBS volume for persistent storage
+- AMI with Jenkins pre-installed or provisioning script
+- Route53 DNS configuration
+
+## Development Roadmap
+
+Before this module can be used in production:
+
+1. Fix syntax errors and variable interpolation
+2. Define missing resources (placement group, launch configuration)
+3. Implement security groups
+4. Create outputs.tf with essential values
+5. Parameterize hardcoded values
+6. Add IAM role configuration
+7. Implement proper error handling
+8. Add comprehensive examples
+9. Write integration tests
+
+## Intended Usage Pattern
+
+```hcl
+# Example (NOT WORKING - for reference only)
+module "jenkins" {
+  source = "path/to/terraform-aws-jenkins"
+
+  project                   = "myproject"
+  env                       = "staging"
+  jenkins_version           = "2.361.1"
+  jenkins_url               = "jenkins.example.com"
+  loadbalancer_name         = "jenkins-lb"
+  loadbalancer_certificate  = "arn:aws:acm:region:account:certificate/..."
+  ami_id                    = "ami-xxxxxxxxx"
+  instance_type             = "c5.xlarge"
+  persistent_volume_id      = "vol-xxxxxxxxx"
+}
+```
+
+## Contributing
+
+Contributions to complete this module are welcome. Priority areas:
+
+- Fix existing syntax errors
+- Complete resource definitions
+- Add comprehensive documentation
+- Implement security best practices
+- Add examples and tests
+
+## License
+
+See project license file.
+
+## Authors
+
+Maintained by WebBuildYourCloud team.
+
+---
+
+**Note**: Do not use this module in production environments until the known issues have been resolved.
diff --git a/main.tf b/main.tf
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+resource "aws_autoscaling_group" "jenkins_autoscaling_group" {
+  name = ""
+  max_size = 1
+  min_size = 1
+  health_check_grace_period = 300
+  health_check_type = "ELB"
+  desired_capacity = 1
+  force_delete = true
+  placement_group = "aws_placement_group.jenkins-${env}.id"
+  launch_configuration = "aws_launch_configuration.jenkins.jenkins-${env}"
+  vpc_zone_identifier = [ "aws_subnet.jenkins1.id, aws_subnet.jenkins2.id, aws_subnet.jenkins3.id" ]
+}
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diff --git a/provider.tf b/provider.tf
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diff --git a/terraform.tfvars b/terraform.tfvars
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diff --git a/variables.tf b/variables.tf
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+variable "project" {
+   description = "Project name" 
+   type        = string
+}
+
+variable "env" {
+  description = "Environment/Stage"
+  type        = string
+}
+
+variable "jenkins_version" {
+  description = "Define the version of Jenkins that needs to be installed"
+  type        = string
+  default     = ""
+}
+
+variable "jenkins_url" {
+  description = "Define the url on which Jenkins should be reachable"
+  type        = string
+  default     = "stg-jenkins.build.edubase.malmberg.nl"
+}
+
+variable "loadbalancer_name" {
+  description = "Define name for the ELB"
+  type        = string
+  default     = "stg-jenkins"
+}
+
+variable "loadbalancer_certificate" {
+  description = "Define certificate for ELB"
+  type        = string
+  default     = "arn:aws:acm:eu-west-1:439778125761:certificate/07ea8bf6-f5ae-4c65-ae87-921fc29c980f"
+}
+
+variable "ami_id" {
+  description = "Define the AMI for the Jenkins master"
+  type        = string
+  default     = "ami-03a779dec4508895a"
+}
+
+variable "instance_type" {
+  description = "EC2 Instance type for the Jenkins master"
+  type        = string
+  default     = "c5.xlarge"
+}
+
+variable "persistent_volume_id" {
+  description = "Define ID of the persistent volume"
+  type        = string
+  default     = "vol-03dde8c1fabe3de46"
+}
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