Description

This module automatically vertically scales AWS Fargate tasks when they run out memory due to an OOM Exception. It uses two Lambda functions to monitor for RunTask commands and for ECS stopped tasks. When it encounteres an OOM error it will restart the tasks automatically with double the memory.

Your tasks have to be idempotent for this to work!

For more debugging steps check out the elasticscale blog.

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Requirements

Name	Version
aws	5.6.2

Providers

Name	Version
archive	2.4.0
aws	5.6.2
random	3.5.1

Modules

Name	Source	Version
dynamodb_tasks	terraform-aws-modules/dynamodb-table/aws	n/a
s3_bucket	cloudposse/cloudtrail-s3-bucket/aws	0.26.2

Resources

Name	Type
aws_cloudtrail.cf_task_trail	resource
aws_cloudwatch_event_rule.ct_event_rule	resource
aws_cloudwatch_event_rule.ecs_event_rule	resource
aws_cloudwatch_event_target.ct_event_target	resource
aws_cloudwatch_event_target.ecs_event_target	resource
aws_iam_role.lambda_ct	resource
aws_iam_role.lambda_ecs	resource
aws_lambda_function.lambda_ct	resource
aws_lambda_function.lambda_ecs	resource
aws_lambda_permission.lambda_ct_resource_policy	resource
aws_lambda_permission.lambda_ecs_resource_policy	resource
random_string.random	resource
archive_file.lambda_ct	data source
archive_file.lambda_ecs	data source
aws_iam_policy_document.lambda_ct	data source
aws_iam_policy_document.lambda_ecs	data source

Inputs

Name	Description	Type	Default	Required
iam_pass_roles	The possible IAM roles for your task definitions, this is used in the IAM policy to allow the lambda to pass the role, using [*] is a bad practice here	list(string)	n/a	yes
max_memory	The maximum amount of memory to allow a task to use in MB	number	122880	no
prefix	Value to prefix all resources with (lowercase)	string	"fargatevertiscale"	no
region	AWS region to deploy to	string	n/a	yes
setup_cloud_trail	Setup CloudTrail to capture ECS events, if you already have a trail setup to an S3 bucket you can set this to false. Without CloudTrail the module will not work	bool	true	no
tag_name	The tag name attached to RunTask command that triggers this module to run	string	"fargatevertiscale"	no
task_expires	Purge tasks from DynamoDB after this many seconds (default 7 days)	number	604800	no

Outputs

No outputs.