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Akhil Ghatiki for AWS Community Builders

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AWS ECS Task deployment failed alert using Amazon EventBridge β€” Part 2 (Terraform code)

Please read Part 1 for more context before you continue with this blog post

The Part 1 talks about event pattern rule to filter events of a task failure. In this blog post, lets take a look at the terraform code for this implementation

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This blog post assumes you are quite familiar with the Terraform and you have some hands on experience with it.

resource "aws_cloudwatch_event_rule" "ecs_task_failure" {
  count   = length(local.ecs_services_list)
  name          = "${local.ecs_services_list[count.index]}-ecs-task-failed"
  description   = "Rule to monitor failures in ecs tasks"
  event_pattern = <<PATTERN
                  {
                    "source": ["aws.ecs"],
                    "detail-type": ["ECS Task State Change"],
                    "detail": {
                      "group": ["service:service-name"],
                      "stoppedReason": [{
                        "anything-but": {
                          "prefix": "Scaling activity initiated by (deployment"
                        }
                      }],
                      "lastStatus": ["STOPPED"]
                    }
                  }
                  PATTERN
  is_enabled    = true
}
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The above snippet creates the event rule as per the pattern we discussed in Part 1.

And you can create the target to this event rule as below.

resource "aws_cloudwatch_event_target" "cloudwatch_alarms" {
  arn       = <<your sns arn>>
  target_id = "service-name-ecs-task-failed-event-target"
  rule      = aws_cloudwatch_event_rule.ecs_task_failure.name
  input     = "{\"Subject\":\"ALARM: ECS task failed - service-name\",\"AlarmDescription\":\"ECS task failed\"}"
}
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Now, you can have your lambda triggered for the events coming from the SNS and the lambda can alert the teams (any communication medium that you use)

God Speed !!

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