Necessary s3cmd S3 permissions for PUT/Sync

Question

In moving to AWS EC2, I want to restrict my instances\' user permissions for good reason. One thing the instances need to do is access files on S3 and write files there. However

Answer 1

I was trying to do big file uploads and the policy wasn't working well for me, I ended adding the next policy to the user:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "Stmt1397834652000",
            "Effect": "Allow",
            "Action": [
                "s3:ListAllMyBuckets"
            ],
            "Resource": [
                "arn:aws:s3:::*"
            ]
        },
        {
            "Sid": "Stmt1397834745000",
            "Effect": "Allow",
            "Action": [
                "s3:ListBucket",
                "s3:ListBucketMultipartUploads",
                "s3:GetBucketLocation",
                "s3:AbortMultipartUpload",
                "s3:GetObjectAcl",
                "s3:GetObjectVersion",
                "s3:DeleteObject",
                "s3:DeleteObjectVersion",
                "s3:GetObject",
                "s3:PutObjectAcl",
                "s3:PutObject",
                "s3:GetObjectVersionAcl"
            ],
            "Resource": [
                "arn:aws:s3:::my_bucket",
                "arn:aws:s3:::my_bucket/*"
            ]
        }
    ]
}

where my_bucket is the bucket where I need to manage files though s3cmd