Stop and Start EC2 Instances at Scheduled Intervals Using Lambda

To do this practice, first we need to go through one more practical, using below-provided URL:

https://redhatpanacia.blogspot.com/2019/08/lambda.html

Step 1: Schedule a Cron using CloudWatch:

AWS ➔ Services ➔ CloudWatch ➔ Events ➔ Get started ➔ [*] Schedule ➔ [*] Cron expression: (provide UTC timing here because AWS cron uses Universal time)…

As I am doing this practical in India, so, I need to convert time from IST to UTC.

To open the converter click on URL:

https://www.worldtimebuddy.com/ist-to-utc-converter

to learn AWS Schedule Expressions for a role, use URL:

https://docs.aws.amazon.com/AmazonCloudWatch/latest/events/ScheduledEvents.html

AWS Cron scheduler does not support all '*' together, we need to provide one '?' among them.

…select the UTC time and provide Cron expression: 46 7 * * ? * ➔ as we provide Cron expressions, this will result us the timings on which Lambda will start the instance…

Fig: Event Source

… ➔ Add target: as our instance is stopped, select Lambda function which we created to start the instance ➔ Configure details ➔ Rule definition: Name: start_instance ➔ provide some description ➔ State: enabled ➔ Create rule.

Step 2: Verify the status of instance:

AWS ➔ Services ➔ EC2 ➔ Here, we can see that instance is in running state now.

Similarly, you can create a rule to stop the instance also.

Enjoy!