Terraform 1.3.5: how to to Update Security Group Rules Dynamically Based on Environment Variable
I'm following best practices but I'm converting an old project and I'm integrating two systems and I'm deploying to production and I'm working with an scenario with dynamically updating security group rules in AWS based on environment variables using Terraform 1.3.5..... I have a security group defined, and I want to conditionally add ingress rules based on the value of an environment variable that indicates the environment (e.g., `dev`, `prod`). I'm using the following configuration: ```hcl variable "environment" { description = "Deployment Environment" type = string } resource "aws_security_group" "app_sg" { name = "app_security_group" description = "Security group for the app" dynamic "ingress" { for_each = var.environment == "prod" ? [1] : [] content { from_port = 80 to_port = 80 protocol = "tcp" cidr_blocks = ["0.0.0.0/0"] } } dynamic "ingress" { for_each = var.environment == "dev" ? [1] : [] content { from_port = 8080 to_port = 8080 protocol = "tcp" cidr_blocks = ["10.0.0.0/16"] } } } ``` When I run `terraform apply`, it seems that the security group is created correctly, but subsequent changes to the `environment` variable do not reflect in the security group rules as expected. Instead, I see the following behavior message: ``` behavior: InvalidRequest: The specified rule already exists in the security group. Status code: 400 ``` I tried removing the ingress rules manually from the AWS console, but they still seem to continue when I run `terraform apply` again. I also ensured that I am using the `terraform apply` command with `-refresh=true`. Additionally, I have verified that the `environment` variable is being passed correctly at runtime. Has anyone encountered a similar scenario or have suggestions on how to manage dynamic security group rules effectively in Terraform? Any insight would be much appreciated! My development environment is Linux. Thanks in advance! The stack includes Hcl and several other technologies. Is there a simpler solution I'm overlooking? Hoping someone can shed some light on this. Is there a better approach? Any pointers in the right direction?