ERRO[0000] Found a dependency cycle between modules:

[Vijaylokesh]

I am creating two Security Groups, One for Application SG and Second one is RDS SG

Application SG Module1:

include "root" {
path = find_in_parent_folders()
expose = true
}

dependency "vpc" {
config_path = "../../vpc"
mock_outputs = {
vpc_id = "temporary-dummy-id"
}
}

dependency sg-rds {
config_path = "../rds"
mock_outputs = {
security_group_id = "temporary-dummy-id"
}
skip_outputs = true
}

dependencies {
paths = ["../rds"]
}

terraform {
source = "github.com/terraform-aws-modules/terraform-aws-security-group.git?ref=v4.3.0"
}

inputs = {
name = "${include.root.locals.prj}-app-sg-${include.root.locals.env}-${include.root.locals.aws_region}"
use_name_prefix = false
vpc_id = dependency.vpc.outputs.vpc_id

egress_with_source_security_group_id = [

{
  from_port                = 3306
  to_port                  = 3306
  protocol                 = "tcp"
  description              = "Allow access to connect MySQL"
  source_security_group_id = dependency.sg-rds.outputs.security_group_id
}

]
}

RDS SG Module2

include "root" {
path = find_in_parent_folders()
expose = true
}

dependency "vpc" {
config_path = "../../vpc"
mock_outputs = {
vpc_id = "temporary-dummy-id"
vpc_cidr_block = "10.0.0.0/16"
}
}

dependency sg-app-ec2 {
config_path = "../app-ec2"
mock_outputs = {
security_group_id = "temporary-dummy-id"
}
}

dependencies {
paths = ["../app-ec2"]
}

terraform {
source = "github.com/terraform-aws-modules/terraform-aws-security-group.git?ref=v4.3.0"
}

inputs = {
name = "${include.root.locals.prj}-rds-sg-${include.root.locals.env}-${include.root.locals.aws_region}"
use_name_prefix = false
vpc_id = dependency.vpc.outputs.vpc_id

ingress_with_source_security_group_id = [

{
  from_port                = 3306
  to_port                  = 3306
  protocol                 = "tcp"
  description              = "Allow access to connect MySQL"
  source_security_group_id = dependency.sg-rds.outputs.security_group_id
}

]
}

AM running the below commands
terragrunt run-all plan

and getting below error

ERRO[0000] Found a dependency cycle between modules:

Let us know how to pass dependency variables between two modules

---

Tracked in ticket #109098

[rhoboat]

First of all, the creative formatting of the code in your post makes it difficult to read. Just a minor note that I wanted to share for the sake of yourself and everyone else in the future.

Second, and most important, Gruntwork does not maintain modules within github.com/terraform-aws-modules. We suggest you ask about this issue over there. (Be sure to format correctly!)

Thirdly, as we maintain Terragrunt, terragrunt run-all plan is not a reliable command in all cases. Please see the documentation on run-all, especially the section on plan.