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Akanksha
Akanksha

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Multiple rule to one target in terraform

#terraform #aws

Hi , I have created three cloduwatch event rules and want to assign to one lambda function as target. Can anyone help me with the code how to do it in terraform.

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rolfstreefkerk profile image
Rolf Streefkerk • • Edited

The basic setup of linking an event to a lambda (1 or more) is like this:

The cloudwatch event rule

resource "aws_cloudwatch_event_rule" "_" {
  name                = "${local.resource_name_prefix}-${var.event_rule_name}"
  description         = var.event_rule_description
  schedule_expression = var.schedule_expression
  is_enabled          = var.is_enabled
}
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For each lambda you will have to set the two resources below (aws_cloudwatch_event_target and aws_lambda_permission):

resource "aws_cloudwatch_event_target" "_" {
  rule      = aws_cloudwatch_event_rule._.name
  target_id = var.lambda_function_name
  arn       = var.lambda_function_arn
}
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Permission to allow cloudwatch event to execute the Lambda:

resource "aws_lambda_permission" "_" {
  statement_id  = "AllowExecutionFromCloudWatch"
  action        = "lambda:InvokeFunction"
  function_name = var.lambda_function_arn
  principal     = "events.amazonaws.com"
  source_arn    = aws_cloudwatch_event_rule._.arn
}
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That's it

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