terraform-aws-lambda-scheduler-stop-start

Stop and start instance, rds resources and autoscaling groups with lambda function.

Terraform versions

For Terraform 0.12 use version v2.* of this module.

If you are using Terraform 0.11 you can use versions v1.*.

Future version v3.*

• Multi aws tags support (backward compatibility)
• Use bool type for scheduler service variable (backward compatibility)
• Terminate action for autoscaling group instance

Features

• Aws lambda runtine Python 3.7
• ec2 instances scheduling
• spot instances scheduling
• rds clusters scheduling
• rds instances scheduling
• autoscalings scheduling
• cloudwatch alarm scheduling
• Aws CloudWatch logs for lambda

Caveats

You can't stop and start an Amazon Spot instance (only the Spot service can stop and start a Spot Instance), but you can reboot or terminate a Spot Instance. That why this module support only scheduler action terminate for spot instance.

Usage

module "stop_ec2_instance" {
  source                         = "diodonfrost/lambda-scheduler-stop-start/aws"
  name                           = "ec2_stop"
  cloudwatch_schedule_expression = "cron(0 0 ? * FRI *)"
  schedule_action                = "stop"
  autoscaling_schedule           = "false"
  spot_schedule                  = "terminate"
  ec2_schedule                   = "true"
  rds_schedule                   = "false"
  resources_tag                  = {
    key   = "tostop"
    value = "true"
  }
}

module "start_ec2_instance" {
  source                         = "diodonfrost/lambda-scheduler-stop-start/aws"
  name                           = "ec2_start"
  cloudwatch_schedule_expression = "cron(0 8 ? * MON *)"
  schedule_action                = "start"
  autoscaling_schedule           = "false"
  spot_schedule                  = "false"
  ec2_schedule                   = "true"
  rds_schedule                   = "false"
  resources_tag                  = {
    key   = "tostop"
    value = "true"
  }
}

Examples

• Autoscaling scheduler - Create lambda functions to suspend autoscaling group with tag tostop = true and terminate its ec2 instances on Friday at 23:00 Gmt and start them on Monday at 07:00 GMT
• Spot scheduler - Create lambda functions to stop spot instance with tag tostop = true on Friday at 23:00 Gmt
• EC2 scheduler - Create lambda functions to stop ec2 with tag tostop = true on Friday at 23:00 Gmt and start them on Monday at 07:00 GMT
• Rds aurora - mariadb scheduler - Create lambda functions to stop rds mariadb and aurora cluster with tag tostop = true on Friday at 23:00 Gmt and start them on Monday at 07:00 GMT
• test fixture - Deploy environment for testing module

Inputs

Name	Description	Type	Default	Required
name	Define name to use for lambda function, cloudwatch event and iam role	string	n/a	yes
custom_iam_role_arn	Custom IAM role arn for the scheduling lambda	string	null	no
kms_key_arn	The ARN for the KMS encryption key. If this configuration is not provided when environment variables are in use, AWS Lambda uses a default service key	string	null	no
aws_regions	A list of one or more aws regions where the lambda will be apply, default use the current region	list	null	no
cloudwatch_schedule_expression	The scheduling expression	string	"cron(0 22 ? * MON-FRI *)"	yes
schedule_action	Define schedule action to apply on resources	string	"stop"	yes
resources_tag	Set the tag use for identify resources to stop or start	map	{ tostop = "true" }	yes
autoscaling_schedule	Enable scheduling on autoscaling resources	string	"false"	no
spot_schedule	Enable scheduling on spot instance resources	string	"false"	no
ec2_schedule	Enable scheduling on ec2 instance resources	string	"false"	no
rds_schedule	Enable scheduling on rds resources	string	"false"	no
cloudwatch_alarm_schedule	Enable scheduleding on cloudwatch alarm resources	string	"false"	no

Outputs

Name	Description
lambda_iam_role_arn	The ARN of the IAM role used by Lambda function
lambda_iam_role_name	The name of the IAM role used by Lambda function
scheduler_lambda_arn	The ARN of the Lambda function
scheduler_lambda_name	The name of the Lambda function
scheduler_lambda_invoke_arn	The ARN to be used for invoking Lambda function from API Gateway
scheduler_lambda_function_last_modified	The date Lambda function was last modified
scheduler_lambda_function_version	Latest published version of your Lambda function
scheduler_log_group_name	The name of the scheduler log group
scheduler_log_group_arn	The Amazon Resource Name (ARN) specifying the log group

Tests

Some of these tests create real resources in an AWS account. That means they cost money to run, especially if you don't clean up after yourself. Please be considerate of the resources you create and take extra care to clean everything up when you're done!

In order to run tests that access your AWS account, you will need to configure your AWS CLI credentials. For example, you could set the credentials as the environment variables AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY.

Integration tests

Integration tests are realized with python boto3 and pytest modules.

Install Python dependency:

python3 -m pip install boto3 pytest pytest-cov pytest-xdist

# Test python code use by instance scheduler scheduler
python3 -m pytest -n 4 --cov=package tests/integration/test_instance_scheduler.py

# Test python code use by spot scheduler scheduler
python3 -m pytest -n 2 --cov=package tests/integration/test_spot_scheduler.py

# Test python code use by autoscaling scheduler
python3 -m pytest -n 4 --cov=package tests/integration/test_asg_scheduler.py

# Test python code use by rds scheduler
python3 -m pytest -n 8 --cov=package tests/integration/test_rds_scheduler.py

# Test pythn code use by cloudwatch alarm scheduler
python3 -m pytest -n 12 --cov=package tests/integration/test_cloudwatch_alarm_scheduler.py

# Test all python code
python3 -m pytest -n 30 --cov=package tests/integration/

End-to-end tests

This module has been packaged with Terratest to tests this Terraform module.

Install Terratest with depedencies:

# Prerequisite: install Go
go get ./...

# Test instance scheduler
go test -timeout 900s -v tests/end-to-end/instance_scheduler_test.go

# Test spot scheduler
go test -timeout 900s -v tests/end-to-end/spot_scheduler_test.go

# Test autoscaling scheduler
go test -timeout 900s -v tests/end-to-end/autoscaling_scheduler_test.go

Authors

Modules managed by diodonfrost

Licence

Apache 2 Licensed. See LICENSE for full details.

Resources

• cloudwatch schedule expressions
• Python boto3 ec2
• Python boto3 rds
• Python boto3 autoscaling
• Terratest