AWS lambda running shell script

Question

I have the following Python code written as part of an AWS Lambda:

import json
import os
def lambda_handler(event, context):
    os.system("docker cp panaxeaA1/ panaxea:app/phdcode")
    return {
        'statusCode': 200,
        'body': json.dumps('Hello from Lambda!')
    }

Which returns the following error:


16:21:23
START RequestId: 5693fd73-debb-11e8-9a71-ff6726b7be00 Version: $LATEST

16:21:23
sh: docker: command not found

16:21:23
END RequestId: 5693fd73-debb-11e8-9a71-ff6726b7be00

16:21:23
REPORT RequestId: 5693fd73-debb-11e8-9a71-ff6726b7be00  Duration: 16.04 ms  Billed Duration: 100 ms Memory Size: 128 MB Max Memory Used: 18 MB
No newer events found at the moment. Retry.

Docker is installed on the instance though... Any advice? I was under the impression I could make cmd calls via python?

Can you elaborate on what you mean by "Docker is installed on the instance"? — jarmod
– jarmod, Commented Nov 2, 2018 at 18:33

TaiT's · Accepted Answer · 2018-11-02 17:07:45Z

Docker is installed on the instance though... Any advice? I was under the impression I could make cmd calls via python?

Which "instance" are you talking about?! You are not executing your lambda function on your own instance!

According to the documentation:

[...]When a Lambda function is invoked, AWS Lambda launches an execution context based on the configuration settings you provide. The execution context is a temporary runtime environment that initializes any external dependencies of your Lambda function code[...] -> https://docs.aws.amazon.com/lambda/latest/dg/running-lambda-code.html

In order to call commands you have to install/embbed the packages your function needs into your lambda deployment package. See: https://docs.aws.amazon.com/lambda/latest/dg/lambda-python-how-to-create-deployment-package.html

Hope it helps!

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