this task is not possible to resolve … terraform even didn’t start code validation always said Step Functions data source does not depend on the SSM parameter.
@raymond.baoly any news?
The task is now doable with clearer instructions. I’ve shared an example directly with Peshovec. Please try again and let me know if you have any confusion.
Yes, sure! I’ve just sent you an example.
Hi,
Can you also share the example with me too? I’ve been stuck at this task since last december with the same problem as @Danielyan.
Was able to complete, Were nat be able without your hints. Thanks again.
p.s. Had to use literally your choices for resources names. Also passed without to implement fully the described in the task requirements (dig out the specific permission policy in my attempts to narrow down the root cause for failures). Share this, just for the case if improving task description / validation is relevant.
It doesn’t work for me. Is the code complete?
cat > variables.tf << ‘EOF’
variable “KKE_SNS_TOPIC_NAME” {
description = “Name of the SNS topic”
type = string
default = “”
}
variable “KKE_SSM_PARAM_NAME” {
description = “SSM parameter name”
type = string
default = “”
}
variable “KKE_STEP_FUNCTION_NAME” {
description = “Step Function name”
type = string
default = “”
}
EOF
cat > terraform.tfvars << ‘EOF’
KKE_SNS_TOPIC_NAME = “nautilus-sns-topic”
KKE_SSM_PARAM_NAME = “nautilus-param”
KKE_STEP_FUNCTION_NAME = “nautilus-stepfunction”
EOF
mkdir -p modules/sns modules/ssm modules/stepfunctions
cat > modules/sns/main.tf << ‘EOF’
resource “aws_sns_topic” “this” {
name = var.KKE_SNS_TOPIC_NAME
}
EOF
cat > modules/sns/outputs.tf << ‘EOF’
output “topic_name” {
value = aws_sns_topic.this.name
}
output “topic_arn” {
value = aws_sns_topic.this.arn
}
EOF
cat > modules/ssm/module_vars.tf << ‘EOF’
variable “sns_topic_arn” {
type = string
description = “SNS Topic ARN from SNS module”
}
EOF
cat > modules/ssm/main.tf << ‘EOF’
resource “aws_ssm_parameter” “this” {
name = var.KKE_SSM_PARAM_NAME
type = “String”
value = var.sns_topic_arn
}
EOF
cat > modules/ssm/outputs.tf << ‘EOF’
output “parameter_name” {
value = aws_ssm_parameter.this.name
}
output “parameter_arn” {
value = aws_ssm_parameter.this.arn
}
EOF
cat > modules/stepfunctions/module_vars.tf << ‘EOF’
variable “ssm_parameter_arn” {
type = string
description = “ARN of SSM parameter from data source in root”
}
variable “ssm_parameter_value” {
type = string
description = “Value of SSM parameter from data source in root”
}
EOF
cat > modules/stepfunctions/main.tf << ‘EOF’
resource “aws_iam_role” “step_function_role” {
name = “${var.KKE_STEP_FUNCTION_NAME}-role”
assume_role_policy = jsonencode({
Version = “2012-10-17”
Statement = [{
Action = “sts:AssumeRole”
Effect = “Allow”
Principal = {
Service = “states.amazonaws.com”
}
}]
})
}
resource “aws_iam_role_policy” “step_function_policy” {
name = “${var.KKE_STEP_FUNCTION_NAME}-policy”
role = aws_iam_role.step_function_role.id
policy = jsonencode({
Version = “2012-10-17”
Statement = [{
Effect = “Allow”
Action = [“ssm:GetParameter”]
Resource = var.ssm_parameter_arn
}]
})
}
resource “aws_sfn_state_machine” “this” {
name = var.KKE_STEP_FUNCTION_NAME
role_arn = aws_iam_role.step_function_role.arn
definition = jsonencode({
Comment = “Step Function using SSM parameter”
StartAt = “PassState”
States = {
PassState = {
Type = “Pass”
Result = {
SSMParameterARN = var.ssm_parameter_arn
SSMParameterValue = var.ssm_parameter_value
}
End = true
}
}
})
}
EOF
cat > modules/stepfunctions/outputs.tf << ‘EOF’
output “state_machine_name” {
value = aws_sfn_state_machine.this.name
}
EOF
echo “Checking module files…”
for module in sns ssm stepfunctions; do
if [ ! -f “modules/$module/main.tf” ]; then
echo " ERROR: modules/$module/main.tf not found!"
exit 1
fi
if [ ! -f “modules/$module/outputs.tf” ]; then
echo " ERROR: modules/$module/outputs.tf not found!"
exit 1
fi
done
echo “All module files created”
echo “Creating symlinks…”
rm -f modules/sns/variables.tf modules/ssm/variables.tf modules/stepfunctions/variables.tf
ln -s /home/bob/terraform/variables.tf modules/sns/variables.tf
ln -s /home/bob/terraform/variables.tf modules/ssm/variables.tf
ln -s /home/bob/terraform/variables.tf modules/stepfunctions/variables.tf
echo “Verifying symlinks:”
ls -la modules/*/variables.tf
cat > main.tf << ‘EOF’
module “sns” {
source = “./modules/sns”
KKE_SNS_TOPIC_NAME = var.KKE_SNS_TOPIC_NAME
KKE_SSM_PARAM_NAME = var.KKE_SSM_PARAM_NAME
KKE_STEP_FUNCTION_NAME = var.KKE_STEP_FUNCTION_NAME
}
module “ssm” {
source = “./modules/ssm”
KKE_SNS_TOPIC_NAME = var.KKE_SNS_TOPIC_NAME
KKE_SSM_PARAM_NAME = var.KKE_SSM_PARAM_NAME
KKE_STEP_FUNCTION_NAME = var.KKE_STEP_FUNCTION_NAME
sns_topic_arn = module.sns.topic_arn
depends_on = [module.sns]
}
data “aws_ssm_parameter” “this” {
name = module.ssm.parameter_name
depends_on = [module.ssm]
}
module “stepfunctions” {
source = “./modules/stepfunctions”
KKE_SNS_TOPIC_NAME = var.KKE_SNS_TOPIC_NAME
KKE_SSM_PARAM_NAME = var.KKE_SSM_PARAM_NAME
KKE_STEP_FUNCTION_NAME = var.KKE_STEP_FUNCTION_NAME
ssm_parameter_arn = data.aws_ssm_parameter.this.arn
ssm_parameter_value = data.aws_ssm_parameter.this.value
depends_on = [data.aws_ssm_parameter.this]
}
EOF
============================================================================
7. outputs.tf
============================================================================
cat > outputs.tf << ‘EOF’
output “kke_sns_topic_name” {
value = module.sns.topic_name
}
output “kke_ssm_parameter_name” {
value = module.ssm.parameter_name
}
output “kke_step_function_name” {
value = module.stepfunctions.state_machine_name
}
EOF
1 Like
I’m getting this error: SSM parameter does not have a visible Terraform graph dependency on SNS.
Here’s my code:
mkdir -p modules/sns modules/ssm modules/stepfunctions
cat << EOF > variables.tf
variable "KKE_SNS_TOPIC_NAME" {
type = string
}
variable "KKE_SSM_PARAM_NAME" {
type = string
}
variable "KKE_STEP_FUNCTION_NAME" {
type = string
}
EOF
ln -s /home/bob/terraform/variables.tf modules/sns/variables.tf
ln -s /home/bob/terraform/variables.tf modules/ssm/variables.tf
ln -s /home/bob/terraform/variables.tf modules/stepfunctions/variables.tf
cat << EOF > terraform.tfvars
KKE_SNS_TOPIC_NAME = "nautilus-sns-topic"
KKE_SSM_PARAM_NAME = "nautilus-param"
KKE_STEP_FUNCTION_NAME = "nautilus-stepfunction"
EOF
cat << EOF > outputs.tf
output "kke_sns_topic_name" {
value = module.sns.kke_sns_topic_name
}
output "kke_ssm_parameter_name" {
value = module.ssm.kke_ssm_parameter_name
}
output "kke_step_function_name" {
value = module.stepfunctions.kke_step_function_name
}
EOF
cat << EOF > main.tf
module "sns" {
source = "./modules/sns"
KKE_SNS_TOPIC_NAME = var.KKE_SNS_TOPIC_NAME
KKE_SSM_PARAM_NAME = var.KKE_SSM_PARAM_NAME
KKE_STEP_FUNCTION_NAME = var.KKE_STEP_FUNCTION_NAME
}
module "ssm" {
source = "./modules/ssm"
KKE_SNS_TOPIC_NAME = var.KKE_SNS_TOPIC_NAME
KKE_SSM_PARAM_NAME = var.KKE_SSM_PARAM_NAME
KKE_STEP_FUNCTION_NAME = var.KKE_STEP_FUNCTION_NAME
sns_topic_arn = module.sns.topic_arn
depends_on = [module.sns]
}
module "stepfunctions" {
source = "./modules/stepfunctions"
KKE_SNS_TOPIC_NAME = var.KKE_SNS_TOPIC_NAME
KKE_SSM_PARAM_NAME = var.KKE_SSM_PARAM_NAME
KKE_STEP_FUNCTION_NAME = var.KKE_STEP_FUNCTION_NAME
ssm_parameter_arn = module.ssm.parameter_arn
ssm_parameter_value = module.sns.topic_arn
depends_on = [module.ssm]
}
EOF
cat << EOF > modules/sns/outputs.tf
output "kke_sns_topic_name" {
value = aws_sns_topic.KKE_SNS_TOPIC_NAME.name
}
output "topic_arn" {
value = aws_sns_topic.KKE_SNS_TOPIC_NAME.arn
}
EOF
cat << EOF > modules/ssm/outputs.tf
output "kke_ssm_parameter_name" {
value = aws_ssm_parameter.KKE_SSM_PARAM_NAME.name
}
output "parameter_arn" {
value = aws_ssm_parameter.KKE_SSM_PARAM_NAME.arn
}
EOF
cat << EOF > modules/stepfunctions/outputs.tf
output "kke_step_function_name" {
value = aws_sfn_state_machine.KKE_STEP_FUNCTION_NAME.name
}
EOF
cat << EOF > modules/ssm/module_vars.tf
variable "sns_topic_arn" {
type = string
}
EOF
cat << EOF > modules/stepfunctions/module_vars.tf
variable "ssm_parameter_arn" {
type = string
}
variable "ssm_parameter_value" {
type = string
}
EOF
cat << EOF > modules/sns/main.tf
resource "aws_sns_topic" "KKE_SNS_TOPIC_NAME" {
name = var.KKE_SNS_TOPIC_NAME
}
EOF
cat << EOF > modules/ssm/main.tf
resource "aws_ssm_parameter" "KKE_SSM_PARAM_NAME" {
name = var.KKE_SSM_PARAM_NAME
type = "String"
value = "arn:aws:sns:us-east-1:000000000000:${var.KKE_SNS_TOPIC_NAME}"
}
EOF
cat << EOF > modules/stepfunctions/main.tf
resource "aws_iam_role" "KKE_STEP_FUNCTION_NAME" {
name = var.KKE_STEP_FUNCTION_NAME
assume_role_policy = jsonencode({
Version = "2012-10-17"
Statement = [
{
Action = "sts:AssumeRole"
Effect = "Allow"
Principal = {
Service = "states.amazonaws.com"
}
},
]
})
}
resource "aws_iam_policy" "KKE_STEP_FUNCTION_NAME" {
name = var.KKE_STEP_FUNCTION_NAME
policy = jsonencode({
Version = "2012-10-17"
Statement = [
{
Action = "ssm:GetParameter"
Effect = "Allow"
Resource = var.ssm_parameter_arn
},
]
})
}
resource "aws_iam_role_policy_attachment" "KKE_STEP_FUNCTION_NAME" {
role = aws_iam_role.KKE_STEP_FUNCTION_NAME.name
policy_arn = aws_iam_policy.KKE_STEP_FUNCTION_NAME.arn
}
resource "aws_sfn_state_machine" "KKE_STEP_FUNCTION_NAME" {
name = var.KKE_STEP_FUNCTION_NAME
role_arn = aws_iam_role.KKE_STEP_FUNCTION_NAME.arn
definition = jsonencode({
Comment = "Step Function using SSM parameter"
StartAt = "Start"
States = {
Start = {
Type = "Task"
Resource = "arn:aws:states:::aws-sdk:ssm:getParameter"
Parameters = {
Name = var.KKE_SSM_PARAM_NAME
}
End = true
}
}
})
}
EOF
@raymond.baoly is @Danielyan 's code confirmed to work for this task? My code is almost similar. I wonder what exactly is wrong with my code that is causing the error?
Hi @edsfocci
Yes, it’s confirmed, he was able to pass the task. I reviewed your answer and noticed that you created modules/ssm/module_vars.tf and modules/stepfunctions/module_vars.tf, which aren’t needed. The variables for these modules are already linked from /home/bob/terraform/variables.tf
@raymond.baoly I’m confused by your reply, because I originally attempted this task without modules/ssm/module_vars.tf and modules/stepfunctions/module_vars.tf, and I got the error that time, so I looked at Danielyan’s version, assuming that his code works, and it had the two module_vars.tf files, so I thought it might help my solution. Unfortunately, it didn’t.
You can see Danielyan’s module_vars.tf below:
cat > modules/ssm/module_vars.tf << ‘EOF’
variable “sns_topic_arn” {
type = string
description = “SNS Topic ARN from SNS module”
}
EOF
cat > modules/stepfunctions/module_vars.tf << ‘EOF’
variable “ssm_parameter_arn” {
type = string
description = “ARN of SSM parameter from data source in root”
}
variable “ssm_parameter_value” {
type = string
description = “Value of SSM parameter from data source in root”
}
EOF
same failed too, following Danielyan’s solution.
Hi everyone,
It’s more that 5 days I’m with this task. I tried all way and still I’m getting “Step Functions data source does not depend on the SSM parameter.”
I did complete “@Danielyan” solution and still I’m getting “Step Functions data source does not depend on the SSM parameter.” No way for me to skip this task
How can we validate ?
Hi everyone, Danielyan has confirmed that he was able to pass the task. Not sure why the wrong solution was shared earlier, please refer to the solution here and try again.
main.tf
module "sns" {
source = "./modules/sns"
KKE_SSM_PARAM_NAME = var.KKE_SSM_PARAM_NAME
KKE_SNS_TOPIC_NAME = var.KKE_SNS_TOPIC_NAME
KKE_STEP_FUNCTION_NAME = var.KKE_STEP_FUNCTION_NAME
}
module "ssm" {
source = "./modules/ssm"
KKE_SSM_PARAM_NAME = var.KKE_SSM_PARAM_NAME
KKE_SNS_TOPIC_NAME = var.KKE_SNS_TOPIC_NAME
KKE_STEP_FUNCTION_NAME = var.KKE_STEP_FUNCTION_NAME
depends_on = [module.sns]
}
module "stepfunctions" {
source = "./modules/stepfunctions"
KKE_SSM_PARAM_NAME = var.KKE_SSM_PARAM_NAME
KKE_SNS_TOPIC_NAME = var.KKE_SNS_TOPIC_NAME
KKE_STEP_FUNCTION_NAME = var.KKE_STEP_FUNCTION_NAME
depends_on = [module.ssm]
}
outputs.tf
output "kke_sns_topic_name" {
value = module.sns.kke_sns_topic
}
output "kke_ssm_parameter_name" {
value = module.ssm.kke_sns_parameter_name
}
output "kke_step_function_name" {
value = module.stepfunctions.kke_step_function_name
}
terraform.tfvars
KKE_SNS_TOPIC_NAME = "datacenter-sns-topic"
KKE_SSM_PARAM_NAME = "datacenter-param"
KKE_STEP_FUNCTION_NAME = "datacenter-stepfunction"
variables.tf
variable "KKE_SNS_TOPIC_NAME" {
description = "Name of the SNS topic"
type = string
}
variable "KKE_SSM_PARAM_NAME" {
description = "Name of the SSM parameter"
type = string
}
variable "KKE_STEP_FUNCTION_NAME" {
description = "Name of the Step Function"
type = string
}
modules/sns/main.tf
resource "aws_sns_topic" "this" {
name = var.KKE_SNS_TOPIC_NAME
}
modules/sns/outputs.tf
output "kke_sns_topic" {
value = aws_sns_topic.this.name
}
modules/ssm/main.tf
resource "aws_ssm_parameter" "this" {
name = var.KKE_SSM_PARAM_NAME
type = "String"
value = "arn:aws:sns:us-east-1:000000000000:${var.KKE_SNS_TOPIC_NAME}"
}
modules/ssm/outputs.tf
output "kke_sns_parameter_name" {
value = aws_ssm_parameter.this.name
}
modules/stepfunctions/main.tf
data "aws_ssm_parameter" "sns_param" {
name = var.KKE_SSM_PARAM_NAME
}
resource "aws_iam_role" "sfn_role" {
name = "${var.KKE_STEP_FUNCTION_NAME}-role"
assume_role_policy = jsonencode({
Version = "2012-10-17"
Statement = [{
Effect = "Allow"
Principal = { Service = "states.amazonaws.com" }
Action = "sts:AssumeRole"
}]
})
}
resource "aws_sfn_state_machine" "this" {
name = var.KKE_STEP_FUNCTION_NAME
role_arn = aws_iam_role.sfn_role.arn
definition = jsonencode({
StartAt = "ReadSSM"
States = {
ReadSSM = {
Type = "Pass"
Result = {
SnsArn = data.aws_ssm_parameter.sns_param.value
}
End = true
}
}
})
}
modules/stepfunctions/outputs.tf
output "kke_step_function_name" {
value = aws_sfn_state_machine.this.name
}
Then run this script:
cd modules/sns
ln -s /home/bob/terraform/variables.tf variables.tf
cd ../ssm/
ln -s /home/bob/terraform/variables.tf variables.tf
cd ../stepfunctions/
ln -s /home/bob/terraform/variables.tf variables.tf
1 Like
I’m still getting the same error, and my code is almost the same as from @raymond.baoly . I want to learn, I don’t want to just copy. Can anyone figure out what is wrong with my code?
I wonder if the tests are too strict. The task text says nothing about a specific role name. The text says to make both role and policy, but @raymond.baoly 's code has nothing about a policy. I even found a good alternate aws_sfn_state_machine code that seems to give the same output.
I used this AWS CLI:
aws stepfunctions start-exectution --state-machine-arn arn:aws:states:us-east-1:000000000000:stateMachine:xfusion-stepfunction
aws stepfunctions describe-execution --execution-arn arn:aws:states:us-east-1:000000000000:execution:xfusion-stepfunction:<random_hex_numbers>
My output from execution through AWS CLI:
"output": "{\"SnsArn\":\"arn:aws:sns:us-east-1:000000000000:devops-sns-topic\"}",
@raymond.baoly 's output from execution through AWS CLI:
"output": "{\"SnsArn\":\"arn:aws:sns:us-east-1:000000000000:xfusion-sns-topic\"}",
The current version of my code:
#!/bin/bash
mkdir -p modules/sns modules/ssm modules/stepfunctions
cat << EOF > variables.tf
variable "KKE_SNS_TOPIC_NAME" {
type = string
}
variable "KKE_SSM_PARAM_NAME" {
type = string
}
variable "KKE_STEP_FUNCTION_NAME" {
type = string
}
EOF
ln -s /home/bob/terraform/variables.tf modules/sns/variables.tf
ln -s /home/bob/terraform/variables.tf modules/ssm/variables.tf
ln -s /home/bob/terraform/variables.tf modules/stepfunctions/variables.tf
cat << EOF > terraform.tfvars
KKE_SNS_TOPIC_NAME = "xfusion-sns-topic"
KKE_SSM_PARAM_NAME = "xfusion-param"
KKE_STEP_FUNCTION_NAME = "xfusion-stepfunction"
EOF
cat << EOF > outputs.tf
output "kke_sns_topic_name" {
value = module.sns.kke_sns_topic_name
}
output "kke_ssm_parameter_name" {
value = module.ssm.kke_ssm_parameter_name
}
output "kke_step_function_name" {
value = module.stepfunctions.kke_step_function_name
}
EOF
cat << EOF > main.tf
module "sns" {
source = "./modules/sns"
KKE_SNS_TOPIC_NAME = var.KKE_SNS_TOPIC_NAME
KKE_SSM_PARAM_NAME = var.KKE_SSM_PARAM_NAME
KKE_STEP_FUNCTION_NAME = var.KKE_STEP_FUNCTION_NAME
}
module "ssm" {
source = "./modules/ssm"
KKE_SNS_TOPIC_NAME = var.KKE_SNS_TOPIC_NAME
KKE_SSM_PARAM_NAME = var.KKE_SSM_PARAM_NAME
KKE_STEP_FUNCTION_NAME = var.KKE_STEP_FUNCTION_NAME
depends_on = [module.sns]
}
module "stepfunctions" {
source = "./modules/stepfunctions"
KKE_SNS_TOPIC_NAME = var.KKE_SNS_TOPIC_NAME
KKE_SSM_PARAM_NAME = var.KKE_SSM_PARAM_NAME
KKE_STEP_FUNCTION_NAME = var.KKE_STEP_FUNCTION_NAME
depends_on = [module.ssm]
}
EOF
cat << EOF > modules/sns/outputs.tf
output "kke_sns_topic_name" {
value = aws_sns_topic.KKE_SNS_TOPIC_NAME.name
}
EOF
cat << EOF > modules/ssm/outputs.tf
output "kke_ssm_parameter_name" {
value = aws_ssm_parameter.KKE_SSM_PARAM_NAME.name
}
EOF
cat << EOF > modules/stepfunctions/outputs.tf
output "kke_step_function_name" {
value = aws_sfn_state_machine.KKE_STEP_FUNCTION_NAME.name
}
EOF
cat << EOF > modules/sns/main.tf
resource "aws_sns_topic" "KKE_SNS_TOPIC_NAME" {
name = var.KKE_SNS_TOPIC_NAME
}
EOF
cat << EOF > modules/ssm/main.tf
resource "aws_ssm_parameter" "KKE_SSM_PARAM_NAME" {
name = var.KKE_SSM_PARAM_NAME
type = "String"
value = "arn:aws:sns:us-east-1:000000000000:\${var.KKE_SNS_TOPIC_NAME}"
}
EOF
cat << EOF > modules/stepfunctions/main.tf
data "aws_ssm_parameter" "sns_param" {
name = var.KKE_SSM_PARAM_NAME
}
resource "aws_iam_role" "KKE_STEP_FUNCTION_NAME" {
name = "\${var.KKE_STEP_FUNCTION_NAME}-role"
assume_role_policy = jsonencode({
Version = "2012-10-17"
Statement = [
{
Action = "sts:AssumeRole"
Effect = "Allow"
Principal = {
Service = "states.amazonaws.com"
}
},
]
})
}
# resource "aws_iam_policy" "KKE_STEP_FUNCTION_NAME" {
# name = var.KKE_STEP_FUNCTION_NAME
# policy = jsonencode({
# Version = "2012-10-17"
# Statement = [
# {
# Action = "ssm:GetParameter"
# Effect = "Allow"
# Resource = "*"
# },
# ]
# })
# }
# resource "aws_iam_role_policy_attachment" "KKE_STEP_FUNCTION_NAME" {
# role = aws_iam_role.KKE_STEP_FUNCTION_NAME.name
# policy_arn = aws_iam_policy.KKE_STEP_FUNCTION_NAME.arn
# }
resource "aws_sfn_state_machine" "KKE_STEP_FUNCTION_NAME" {
name = var.KKE_STEP_FUNCTION_NAME
role_arn = aws_iam_role.KKE_STEP_FUNCTION_NAME.arn
definition = jsonencode({
StartAt = "ReadSSM"
States = {
ReadSSM = {
Type = "Pass"
Result = {
SnsArn = data.aws_ssm_parameter.sns_param.value
}
End = true
}
}
})
}
EOF
Copied exact code from Danielyan and still seeing " Step Functions data source does not depend on the SSM parameter"
