Is it possible to copy all files from one S3 bucket to another with s3cmd?

I'm pretty happy with s3cmd, but there is one issue: How to copy all files from one S3 bucket to another? Is it even possible?

EDIT: I've found a way to copy files between buckets using Python with boto:

from boto.s3.connection import S3Connection

def copyBucket(srcBucketName, dstBucketName, maxKeys = 100):
  conn = S3Connection(awsAccessKey, awsSecretKey)

  srcBucket = conn.get_bucket(srcBucketName);
  dstBucket = conn.get_bucket(dstBucketName);

  resultMarker = ''
  while True:
    keys = srcBucket.get_all_keys(max_keys = maxKeys, marker = resultMarker)

    for k in keys:
      print 'Copying ' + k.key + ' from ' + srcBucketName + ' to ' + dstBucketName

      t0 = time.clock()
      dstBucket.copy_key(k.key, srcBucketName, k.key)
      print time.clock() - t0, ' seconds'

    if len(keys) < maxKeys:
      print 'Done'
      break

    resultMarker = keys[maxKeys - 1].key

Syncing is almost as straight forward as copying. There are fields for ETag, size, and last-modified available for keys.

Maybe this helps others as well.

s3cmd sync s3://from/this/bucket/ s3://to/this/bucket/

For available options, please use: $s3cmd --help

AWS CLI seems to do the job perfectly, and has the bonus of being an officially supported tool.

aws s3 sync s3://mybucket s3://backup-mybucket

http://docs.aws.amazon.com/cli/latest/reference/s3/sync.html

The answer with the most upvotes as I write this is this one:

s3cmd sync s3://from/this/bucket s3://to/this/bucket

It's a useful answer. But sometimes sync is not what you need (it deletes files, etc.). It took me a long time to figure out this non-scripting alternative to simply copy multiple files between buckets. (OK, in the case shown below it's not between buckets. It's between not-really-folders, but it works between buckets equally well.)

# Slightly verbose, slightly unintuitive, very useful:
s3cmd cp --recursive --exclude=* --include=file_prefix* s3://semarchy-inc/source1/ s3://semarchy-inc/target/

Explanation of the above command:

• –recursive
  In my mind, my requirement is not recursive. I simply want multiple files. But recursive in this context just tells s3cmd cp to handle multiple files. Great.
• –exclude
  It’s an odd way to think of the problem. Begin by recursively selecting all files. Next, exclude all files. Wait, what?
• –include
  Now we’re talking. Indicate the file prefix (or suffix or whatever pattern) that you want to include.
  s3://sourceBucket/ s3://targetBucket/
  This part is intuitive enough. Though technically it seems to violate the documented example from s3cmd help which indicates that a source object must be specified:
  s3cmd cp s3://BUCKET1/OBJECT1 s3://BUCKET2[/OBJECT2]

You can also use the web interface to do so:

1. Go to the source bucket in the web interface.
2. Mark the files you want to copy (use shift and mouse clicks to mark several).
3. Press Actions->Copy.
4. Go to the destination bucket.
5. Press Actions->Paste.

That's it.

I needed to copy a very large bucket so I adapted the code in the question into a multi threaded version and put it up on GitHub.

https://github.com/paultuckey/s3-bucket-to-bucket-copy-py

It's actually possible. This worked for me:

import boto


AWS_ACCESS_KEY = 'Your access key'
AWS_SECRET_KEY = 'Your secret key'

conn = boto.s3.connection.S3Connection(AWS_ACCESS_KEY, AWS_SECRET_KEY)
bucket = boto.s3.bucket.Bucket(conn, SRC_BUCKET_NAME)

for item in bucket:
    # Note: here you can put also a path inside the DEST_BUCKET_NAME,
    # if you want your item to be stored inside a folder, like this:
    # bucket.copy(DEST_BUCKET_NAME, '%s/%s' % (folder_name, item.key))
    bucket.copy(DEST_BUCKET_NAME, item.key)

Thanks - I use a slightly modified version, where I only copy files that don't exist or are a different size, and check on the destination if the key exists in the source. I found this a bit quicker for readying the test environment:

def botoSyncPath(path):
    """
       Sync keys in specified path from source bucket to target bucket.
    """
    try:
        conn = S3Connection(AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY)
        srcBucket = conn.get_bucket(AWS_SRC_BUCKET)
        destBucket = conn.get_bucket(AWS_DEST_BUCKET)
        for key in srcBucket.list(path):
            destKey = destBucket.get_key(key.name)
            if not destKey or destKey.size != key.size:
                key.copy(AWS_DEST_BUCKET, key.name)

        for key in destBucket.list(path):
            srcKey = srcBucket.get_key(key.name)
            if not srcKey:
                key.delete()
    except:
        return False
    return True

I wrote a script that backs up an S3 bucket: https://github.com/roseperrone/aws-backup-rake-task

#!/usr/bin/env python
from boto.s3.connection import S3Connection
import re
import datetime
import sys
import time

def main():
    s3_ID = sys.argv[1]
    s3_key = sys.argv[2]
    src_bucket_name = sys.argv[3]
    num_backup_buckets = sys.argv[4]
    connection = S3Connection(s3_ID, s3_key)
    delete_oldest_backup_buckets(connection, num_backup_buckets)
    backup(connection, src_bucket_name)

def delete_oldest_backup_buckets(connection, num_backup_buckets):
    """Deletes the oldest backup buckets such that only the newest NUM_BACKUP_BUCKETS - 1 buckets remain."""
    buckets = connection.get_all_buckets() # returns a list of bucket objects
    num_buckets = len(buckets)

    backup_bucket_names = []
    for bucket in buckets:
        if (re.search('backup-' + r'\d{4}-\d{2}-\d{2}' , bucket.name)):
            backup_bucket_names.append(bucket.name)

    backup_bucket_names.sort(key=lambda x: datetime.datetime.strptime(x[len('backup-'):17], '%Y-%m-%d').date())

    # The buckets are sorted latest to earliest, so we want to keep the last NUM_BACKUP_BUCKETS - 1
    delete = len(backup_bucket_names) - (int(num_backup_buckets) - 1)
    if delete <= 0:
        return

    for i in range(0, delete):
        print 'Deleting the backup bucket, ' + backup_bucket_names[i]
        connection.delete_bucket(backup_bucket_names[i])

def backup(connection, src_bucket_name):
    now = datetime.datetime.now()
    # the month and day must be zero-filled
    new_backup_bucket_name = 'backup-' + str('%02d' % now.year) + '-' + str('%02d' % now.month) + '-' + str(now.day);
    print "Creating new bucket " + new_backup_bucket_name
    new_backup_bucket = connection.create_bucket(new_backup_bucket_name)
    copy_bucket(src_bucket_name, new_backup_bucket_name, connection)


def copy_bucket(src_bucket_name, dst_bucket_name, connection, maximum_keys = 100):
    src_bucket = connection.get_bucket(src_bucket_name);
    dst_bucket = connection.get_bucket(dst_bucket_name);

    result_marker = ''
    while True:
        keys = src_bucket.get_all_keys(max_keys = maximum_keys, marker = result_marker)

        for k in keys:
            print 'Copying ' + k.key + ' from ' + src_bucket_name + ' to ' + dst_bucket_name

            t0 = time.clock()
            dst_bucket.copy_key(k.key, src_bucket_name, k.key)
            print time.clock() - t0, ' seconds'

        if len(keys) < maximum_keys:
            print 'Done backing up.'
            break

        result_marker = keys[maximum_keys - 1].key

if  __name__ =='__main__':main()

I use this in a rake task (for a Rails app):

desc "Back up a file onto S3"
task :backup do
     S3ID = "*****"
     S3KEY = "*****"
     SRCBUCKET = "primary-mzgd"
     NUM_BACKUP_BUCKETS = 2

     Dir.chdir("#{Rails.root}/lib/tasks")
     system "./do_backup.py #{S3ID} #{S3KEY} #{SRCBUCKET} #{NUM_BACKUP_BUCKETS}"
end

mdahlman's code didn't work for me but this command copies all the files in the bucket1 to a new folder (command also creates this new folder) in bucket 2.

cp --recursive --include=file_prefix* s3://bucket1/ s3://bucket2/new_folder_name/

s3cmd won't cp with only prefixes or wildcards but you can script the behavior with 's3cmd ls sourceBucket', and awk to extract the object name. Then use 's3cmd cp sourceBucket/name destBucket' to copy each object name in the list.

I use these batch files in a DOS box on Windows:

s3list.bat

s3cmd ls %1 | gawk "/s3/{ print \"\\"\"\"substr($0,index($0,\"s3://\"))\"\\"\"\"; }"

s3copy.bat

@for /F "delims=" %%s in ('s3list %1') do @s3cmd cp %%s %2

You can also use s3funnel which uses multi-threading:

https://github.com/neelakanta/s3funnel

example (without the access key or secret key parameters shown):

s3funnel source-bucket-name list | s3funnel dest-bucket-name copy --source-bucket source-bucket-name --threads=10