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Crude AWS Lambda to deregister nodes from Chef upon EC2 instance termination
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| import json | |
| import chef | |
| # Copy your .chef directory into the root folder of the deployment package: | |
| # http://docs.aws.amazon.com/lambda/latest/dg/lambda-python-how-to-create-deployment-package.html#deployment-pkg-for-virtualenv | |
| # See also https://github.com/coderanger/pychef/issues/41 | |
| print('Loading function') | |
| def lambda_handler(event, context): | |
| print("Event received: " + json.dumps(event)) | |
| for record in event['Records']: | |
| if 'Sns' in record: | |
| message = json.loads(record['Sns']['Message']) | |
| if message['Event'] == 'autoscaling:EC2_INSTANCE_TERMINATE': | |
| instance_id = message['EC2InstanceId'] | |
| print("instance_id = " + instance_id) | |
| try: | |
| chef_api = chef.autoconfigure() | |
| except: | |
| raise Exception('Could not configure Chef!') | |
| try: | |
| rows = chef.Search('node', 'ec2_instance_id:' + instance_id) | |
| except: | |
| raise Exception('Could not search for nodes with ec2_instance_id: ' + instance_id) | |
| for row in rows: | |
| try: | |
| n = chef.Node(row['name']) | |
| except: | |
| raise Exception('Could not fetch node object for ' + row['name']) | |
| print("node: " + str(n)) | |
| try: | |
| c = chef.Client(row['name']) | |
| except: | |
| raise Exception('Could not fetch client object for ' + row['name']) | |
| print("client: " + str(c)) | |
| try: | |
| n.delete() | |
| except: | |
| raise Exception('Could not delete node ' + str(n)) | |
| try: | |
| c.delete() | |
| except: | |
| raise Exception('Could not delete client ' + str(n)) | |
| else: | |
| raise Exception('Could not process SNS message') |
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