Testing a connection to S3 from an EC2 Instance using Python 3

Question

I'm attempting to establish whether an EC2 instance can reach S3. Currently I'm doing this through an upload:

try:
    # Create empty ping file
    subprocess.run(['touch', '/tmp/ping'])

    # Run upload commands
    upload_result = subprocess.run(['aws', 's3', 'cp', '/tmp/ping', 's3://mybucket/ping'])
    
    # Check if it succeeded
    upload_result.check_returncode()
except Exception as e:
    print('Could not reach S3')

However, I'm wondering if there's a more efficient (non-boto) way of doing this. The EC2 Instance does not have s3:getObject permissions, only s3:putObject which is intended. But if there's a way to establish it by a simple HTTPS request or something similar, I would love to hear about it.

jarmod · Accepted Answer · 2021-05-12 15:14:47Z

1

Couple of things here that are not ideal:

shelling out to the awscli (I would use the boto3 SDK instead)
invoking a mutating operation (PutObject) simply to test connectivity

You might consider giving this Lambda function read access to a specific sentinel object (e.g. s3://mybucket/headtest) and then invoke HeadObject against it.

answered May 12, 2021 at 15:14

jarmod

79.8k18 gold badges132 silver badges137 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Testing a connection to S3 from an EC2 Instance using Python 3

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related