The best way to identify objects in bucket s3 that don't have cache-control defined

0

Hello,

I'm looking for the best way to check objects in a bucket that don't have cache-control pre-defined. As I am going to deploy metadata cache-control to an entire bucket via aws cli I wanted to know if I had a way then to ensure that all objects had been processed at the end.

I'm looking to use aws s3api but so far I haven't found the right command.

Any help will be appreciated.

Thanks,

Franck

1 Answer
1
Accepted Answer

Hello Franck,

It seems like you want to identify all S3 objects that do not have the 'Cache-Control' metadata set. I don't think the AWS CLI provides a direct command to filter out such objects. But you can still accomplish it with a combination of commands.

Here's a basic example using AWS CLI and Bash to find S3 objects in a given bucket that do not have the 'Cache-Control' metadata set:

#!/bin/bash
bucket="your-bucket-name"  # replace with your bucket name
aws s3api list-objects --bucket $bucket | jq -r .Contents[].Key | while read key
do
    cache_control=$(aws s3api head-object --bucket $bucket --key "$key" | jq -r .Metadata.\"Cache-Control\")
    if [ "$cache_control" = "null" ]; then
        echo $key
    fi
done

In this script, we are:

  1. Listing all objects in a bucket using aws s3api list-objects.
  2. Iterating over each object key.
  3. Using aws s3api head-object to get the metadata of each object.
  4. Using jq to extract the 'Cache-Control' metadata.
  5. Checking if 'Cache-Control' is 'null' (not set) and if so, printing out the object key.

This script will print out the keys of all objects that do not have 'Cache-Control' set.

Please note the following:

  • You need to have the jq command-line JSON processor installed to run this script. If you don't have it, you can install it with sudo apt-get install jq on Ubuntu or brew install jq on macOS.
  • If your bucket has a large number of objects, you should use the --page-size, --max-items, and --starting-token parameters with the list-objects command to retrieve the objects in smaller batches.
  • You will be billed for the use of the s3api head-object API. Consider the cost if you have a large number of objects.
  • If you have versioning enabled for your bucket, you should modify this script to handle object versions. The list-objects command does not return versions; you need to use the list-object-versions command instead.
  • Replace "your-bucket-name" with the actual name of your S3 bucket.

Hope this helps!

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EXPERT
answered a year ago
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EXPERT
reviewed 8 months ago
  • Hello Ivan, thank you for your reply and the information provided. That's exacly what I was looking for!

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