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schedule_instance_starting_and_shutting_down.md

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Setting auto starting and shutting down every workday.

It will use Cloudwatch events and Lambda function.

  1. Make sure you have an appropriate role that lambda function is going to assume. For example, I have a role named "lambda_ec2_onoff". Its policy is

    {
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "logs:CreateLogGroup",
                "logs:CreateLogStream",
                "logs:PutLogEvents"
            ],
            "Resource": "arn:aws:logs:*:*:*"
        },
        {
            "Effect": "Allow",
            "Action": [
                "ec2:Start*",
                "ec2:Stop*",
                "ec2:Describe*"
            ],
            "Resource": "*"
        }
    ]
}

  2. change directory to <project_root>/scripts/StartStopEc2InstancesLambda, use bash shell to run install_dependency.sh and zip_lambda_expression.sh. After running, one zipped file, containing necessary contents inside directory StartStopEc2InstancesLambda will be created in parent folder, namely <project_root>/scripts

    bash ./zip_lambda_expression.sh

  3. Go to Lambda service of region Ohio. Click "Create function" button.
    create_function

  4. fill form using
    Name: start_stop_instances.
    Runtime: python 3.6,
    Role: choose an existing role
    Existing role: lambda_ec2_onoff

  5. Upload zipped file created in step 2. Then click "Save" at right upper corner.
    upload_zip

  6. Go to CloudWatch services. In the left menu, click "Rules" under "Events", then click "Create rule"

  7. Event Source click "Schedule" radio button, Cron expression 0 13,14 ? * MON-FRI *, targets choose "Lambda function", function choose "start_stop_instances". Configure input to be "Constant (JSON text)". Copy content in file <project_root>/scripts/StartStopEc2InstancesLambda/instance_start_event_constant.json to input box of "Constant (JSON text)". Then click "Configure detail".

    Explanation, this event will be invoked twice at GMT 13:00 and 14:00 in every work day. This rule is going to trigger execution of Lambda function start_stop_instances with event content in instance_start_event_constant.json. The event object is available as a parameter of interface function lambda_handler(event, context). The content in event specifies that instance will only be started when Lambda function is invoked between 08:55am ~ 09:05am of America/New_York timezone.
    edit_cloudwatch_event

  8. Name rule to be "StartEc2RunningIBGateway", input desired description then click "Create rule".

  9. Next, create cloud watch event rule "StopEc2RunningIBGateway" like what is done in step 6-8. Go to CloudWatch services. In the left menu, click "Rules" under "Events", then click "Create rule".

  10. Event Source click "Schedule" radio button, Cron expression 0 21,22 ? * MON-FRI *, targets choose "Lambda function", function choose "start_stop_instances". Configure input to be "Constant (JSON text)". Copy content in file <project_root>/scripts/StartStopEc2InstancesLambda/instance_stop_event_constant.json to input box of "Constant (JSON text)". Then click "Configure detail".

  11. Name rule to be "StopEc2RunningIBGateway", input desired description then click "Create rule".