Everyone would like to schedule EC2 instances and save a couple of bucks. Today, I'm bringing you a small Python that can help you. The steps are the following ones:
Step 1. Create a lambda function called: ec2_scheduler
Step 2. Copy and paste the following code:
import boto3
import os
import json
region = os.environ['REGION']
ec2 = boto3.client('ec2', region_name=region)
instances = []
def lambda_handler(event, context):
action = event['Action']
response = ec2.describe_instances(Filters=[{'Name' : 'instance-state-name','Values' : [action]}, {'Name': 'tag-key', 'Values': ['auto-scheduled']}])
reservations = response['Reservations']
for reservation in reservations:
for instance in reservation['Instances']:
instanceId = instance['InstanceId']
for tag in instance['Tags']:
if tag['Key'] == 'auto-scheduled' and tag['Value'] == 'true':
instances.append(instanceId)
if (action == 'stopped'):
if (len(instances) > 0):
ec2.start_instances(InstanceIds=instances)
else
if (len(instances) > 0):
ec2.stop_instances(InstanceIds=instances)
Step 3. Set a tag to your EC2 instance called: auto-scheduled that has a value assigned as true.
Step 4. Add a new Policy in the configuration and permission section of your Lambda that contains:
{
"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": "*"
}
]
}
Step 5. Schedule your Lambda as triggers with cron expressions like these ones:
- For starting:
cron(0 6 ? * MON-FRI *) - For stopping:
cron(0 16 ? * MON-FRI *)
Step 6. Set a JSON that contains the following expression to know if it's starting or stopping:
- For starting:
{
"Action": "stopped"
}
- For stopping:
{
"Action": "running"
}
And that's all!
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