Start-Stop-EC2-Instances_Across_All_Regions

Two Lambda functions are needed to run Start and Stop Scripts.

---

Start function: Instructions

• Steps

• Tagging Instructions for Start Function

• IAM Roles

Stop function: Instructions

• Tagging Instructions for Stop Function

---

a.) Lambda function to Start Instances (start.js):

The Script runs across all AWS regions and makes API Calls DescribeInstances() and StartInstances(), based on applied filters.

Steps:

• Create a lambda function.
• Add the script to your lambda function.
• Navigate to Event Source.
• Click Add new Event source and Choose Event type as - Cloudwatch Events- Schedule.
• Add Rule name, Description and Schedule Expression as cron(30 14 ? * MON-FRI *) which represents Cron job Schedule to be followed MON-FRI at 14:30 UTC.
• Enable the source and this script will start all instances tagged @ 14:30.

Tags:

• To get your instance retrieved by the Lambda function you need to add tags to it.
• In this script, I've used Key: 'start' and Value : 'StartWeekDays' You can modify it as per your choice.

Required IAM Roles for Lambda Function:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "MyStatementId",
            "Effect": "Allow",
            "Action": [
                "ec2:DescribeInstances",
                "ec2:StopInstances",
                "ec2:StartInstances",
                "logs:CreateLogGroup",
                "logs:CreateLogStream",
                "logs:PutLogEvents"
            ],
            "Resource": [
                "*"
            ]
        }
    ]
}

---

b.) Lambda function to Stop Instances (stop.js):

The stop.js script shuts down all EC2 instances across all regions. Based on requirements cron job can be modified to shut down instances. Instructions are same as Starting Instances, except for the tags.

For Stop-instances function, I have used following Key-pair Tag:

 Key: stop 
 Value: StopWeekDays

Use Same IAM role for this Lambda function also.