Get_All_Ec2_Instances_Across_All_Regions

!Updated code coming soon!

An AWS Lambda function is needed to run.

The Script runs across all AWS regions and makes API Call DescribeInstances(), to get the instances.

getInstances function:

• Steps
• IAM Roles
• Optionals (API gateway and Cloudwatch Automation)

Steps:

• Create a nodejs lambda function.
• Add the script to your function.
• Save and Test the script.
• Additionally, Data can be found in cloudwatch logs.

Optional

a) Automating Script through Cloudwatch

• 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.

b) Creating API through API-Gateway

• Goto API-gateway from aws console.
• Click on CreateAPI
• Select New API and name your API.
• Click on Resources under your created API and you will see /
• Now click on Actions button and select Create Method
• In the dropdown, choose GET and click ok.
• In the GET-Setup choose Integration Type as Lambda Funciton
• Select Lambda Region and the name of above function just created.
• Submit and accept the permission request.
• Now Click on your created GET method.
• Select Integration Request
• Click on BODY MAPPING TEMPLATES.
• Under Request body Passthrough choose When there are no templates defined
• Now, under content-type click Add Mapping template
• In the input-box , type “application/json” (without quotes) and click ok
• Now click on “applicatio/json” and template body will show up at the bottom
• In the generate template dropdown click Method Request passthrough
• Save the code.
• Go back to GET and click on Test
• if the callback is successful it will show data.
• Once the call back is successful, goto Actions button and select Deploy API
• Give a Stage name and click Deploy.
• Goto your API name and got dashboard to see the API URL!
• Do remember to secure your api through keys in Production environments

Required IAM Roles for Lambda Function:

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