View source for Stop / Start EC2 Instance on a schedule

[[Tech Notesp]] > [[AWS]] > Editing Stop / Start EC2 Instance on a schedule

= Introduction =

This approach depends on three components.

* AWS IAM for rights
* Lambda to execute the code
* Event bridge to execute the lambda code


= Setup rights =

== Create a policy ==

* Launch the IAM Console

* Click '''Policies'''

* Click '''Creare policy'''

* Select '''JSON''' (Blue button, top right)


* edit the section and paste the following between the square brackets in the statement.

 {
    "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*"
            ],
            "Resource": "*"
        }
    ]
 }

* Name the polcy '''EC2_StartStop'''


== Create a role ==

* In IAM, Click Roles.

* Select '''AWS Service'''

* Select '''Lambda from the dropdown'''

* Select '''Next'''

* Search for and select  '''EC2_StsartStop'''

* Name the policy '''Lambda_StartStop'''


= Add Lambda functions =

== Create Start Function ==

Note down the instance ID and region for the EC2 instance.

* Name the function '''startEC2'''

* Select '''Python 3.13''' for runtime.

* Change default execution role

* Select '''Ues existing role'''

* Select '''Lambda_StartStop'''

* Select create function

Paste the following code:

replace rrrrr wih the region name
replace iiiiii with the instance ID

 import boto3  
 region = 'rrrrrrr'
 instances = ['iiiiiii']
 ec2 = boto3.client('ec2', region_name=region)
 def lambda_handler(event, context):
     ec2.start_instances(InstanceIds=instances)
     print('started your instances: ' + str(instances))

* Save the function

== Create Stop Function ==

Note down the instance ID and region for the EC2 instance.

* Name the function '''stopEC2'''

* Select '''Python 3.13''' for runtime.

* Change default execution role

* Select '''Ues existing role'''

* Select '''Lambda_StartStop'''

* Select create function

Paste the following code:

replace rrrrr wih the region name
replace iiiiii with the instance ID

 import boto3  
 region = 'rrrrrrr'
 instances = ['iiiiiiiiiii']
 ec2 = boto3.client('ec2', region_name=region)
 def lambda_handler(event, context):
    ec2.stop_instances(InstanceIds=instances)
    print('stopped your instances: ' + str(instances))

* Save the function


= Schedule the functions =

* Open Amazon eventbridge

* Select '''schedules'''

* Select '''Create schedule'''

* Select '''Recurring schedule'''

* Provide a name

* Enter a time use * for wildcards and ? for any day of the week

* Provide schedule flexibility

* Select '''Next'''

* Select '''AWS Lambda Invoke'''

* Select ''StartEC2 function'''

* Repeat the process for the EC2 Stop function