Aws lambda copy file from one s3 bucket to another

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Welcome back! I will continue now by discussing my recomendation as to the best option, and then showing all the steps required to copy or move S3 objects.

Here are the steps we need to take to get all these ingredients to work together in perfect harmony:. Let's give the two buckets names. This user does not have to have a password but only access keys. If the IAM user does not have access keys, you must create access keys for the account.

So we need to allow the user to get an object in the from-source bucket, by giving him permission via the from-source bucket policy, beloning to the Source AWS Account. To do this we make use of a Bucket Policy.

Look at how to add a bucket policy.

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Inside the S3 console select the from-source bucket and click on the Properties button and then select the Permissions section See Image 2 below. Click on the Add bucket policy button and past the bucket policy given above.

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After pasting the bucket policy click on the Save button as shown in image 3 below. At this point all the setup-work so far would have had to be done for all other tools or solutions since this is the fundamental way AWS is granting permissions to resources in S3. It is important to note that this might be already configured but for a different user account.

You have to set the credentials to be that of the user you have setup the User policy for above in step four. Execute the following command and enter the user credentials, first the access key and then the secret key.

The region must be that of the region of the user account, if you do not know this just hit enter by excepting the default. You can also except the default for the last option output format and hit enter:.

aws lambda copy file from one s3 bucket to another

You have seen now that dealing with S3 buckets we have to give the user permission to perform certain actions and at the same time give the user access to the S3 bucket. So again we will have to modify the user policy, but we do not have to create a new bucket policy for the to-destination S3 bucket. The reason is that the to-destination bucket is within the same AWS account as our IAM user and thus we do not have to give explicit permissions on the bucket itself.

However it would be good to go and check if there are not any bucket policies on our destination bucket that might conflict with our user policy. Just make sure that if it is a production environment you make these changes during a scheduled maintenance window. To allow writing to a bucket we will add the "s3:PutObject" Action to our user policy. Since the destination bucket name is different we will have to add it to our list of resources as well.

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The only changes in the user policy was the adding of the "s3:PutObject" Action and another resource for the to-destination bucket.In this era of cloud, where data is always on the move. As the name suggests, it is a simple file storage service, where we can upload or remove files — better referred to as objects.

It is a very flexible storage and it will take care of scalability, security, performance and availability. The next best thing we use here — AWS Lambda!

The new world of Serverless Computing. You will be able to run your workloads easily using Lambda without absolutely bothering about provisioning any resources. Lambda takes care of it all. We can use it as a data source or even as a destination for various applications.

AWS Lambda being serverless allows us to run anything without thinking about any underlying infrastructure. So you can use Lambda for a lot of your processing jobs or even simple communicating with any of your AWS resources.

aws lambda copy file from one s3 bucket to another

Refer to the Tree for more clarity. We need to move these task files to a new bucket while preserving the file hierarchy. For solving this problem, we will use Amazon S3 events. Every file pushed to the source bucket will be an event, this needs to trigger a Lambda function which can then process this file and move it to the destination bucket.

Either you can use an existing role that already has access to the S3 buckets, or you can choose to Create an execution role. If you choose the later, you will need to attach S3 permission to your role. Go to Basic settings in your Lambda Function. You will find this when you scroll down your Lambda Function. Click Edit. You can edit your Lambda runtime settings here, like Timeout — Max of 15 mins.

This is the time for which your Lambda can run. Advisable to set this as per your job requirement. Any time you get an error of Lambda timed out. You can increase this value. This takes you to the IAM console. Click on Attach policies. You can also create inline policy if you need more control on the access you are providing. You can restrict this to particular buckets. For ease of demonstration, we are using AmazonS3FullAccess here.

We are using PUT since we want this event to trigger our Lambda when any new files are uploaded to our source bucket. Check on Enable Trigger. We now write a simple Python script which will pick the incoming file from our source bucket and copy it to another location. The best thing about setting the Lambda S3 trigger is, whenever a new file is uploaded, it will trigger our Lambda. We make use of the event object here to gather all the required information.

Your Lambda function makes use of this event dictionary to identify the location where the file is uploaded. You can test your implementation by uploading a file in any folders of your source bucket, and then check your destination bucket for the same file. You can check your Lambda execution logs in CloudWatch.

We have solved our problem. Just before we conclude this blog, we would like to discuss an important feature of Lambda which will help you to upscale your jobs. What if your application is writing a huge number of files at the same time?How can I migrate objects between my S3 buckets?

Open the Amazon S3 console. Choose a DNS-compliant name for your new bucket. Select your AWS Region. Note : It's a best practice to create the target bucket in the same Region as the source bucket to avoid performance issues associated with cross-Region traffic.

Optionally, choose Copy settings from an existing bucket to mirror the configuration of the source bucket. Enter your access keys access key ID and secret access key.

aws lambda copy file from one s3 bucket to another

Press Enter to skip the default Region and default output options. The sync command lists the source and target buckets to identify objects that are in the source bucket but that aren't in the target bucket. The command also identifies objects in the source bucket that have different LastModified dates than the objects that are in the target bucket.

The sync command on a versioned bucket copies only the current version of the object—previous versions aren't copied. If the operation fails, you can run the sync command again without duplicating previously copied objects. To troubleshoot issues with the sync operation, see Why can't I copy an object between two Amazon S3 buckets? Verify the contents of the source and target buckets by running the following commands:. Compare objects that are in the source and target buckets by using the outputs that are saved to files in the AWS CLI directory.

See the following example output:. Update any existing applications or workloads so that they use the target bucket name. You might need to run sync commands to address discrepancies between source and target buckets if you have frequent writes. Copying an object to a folder.

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How can I copy all objects from one Amazon S3 bucket to another bucket? Last updated: To copy objects from one S3 bucket to another, follow these steps: 1. Create a new S3 bucket. Copy the objects between the S3 buckets. Verify that the objects are copied. Update existing API calls to the target bucket name. Before you begin, consider the following: If you have many objects in your S3 bucket more than 10 million objectsconsider using S3 Batch Operations. You can use S3 Batch operations to automate the copy process.

You can also split sync commands for different prefixes to optimize your S3 bucket performance.

Copying objects using AWS Lambda based on S3 events – Part 1

For more information about optimizing the performance of your workload, see Best practices design patterns: Optimizing Amazon S3 performance.

Choose Create Bucket. Note : Update the command to include your source and target bucket names. Related information Amazon S3 pricing Copying an object to a folder.

Did this article help? Submit feedback. Do you need billing or technical support?Join Stack Overflow to learn, share knowledge, and build your career. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I'm a total noob to working with AWS. I am trying to get a pretty simple and basic operation to work. What I want to do is, upon a file being uploaded to one s3 bucket, I want that upload to trigger a Lambda function that will copy that file to another bucket.

I went to the AWS management console, created an s3 bucket on the us-west2 server called "test-bucket-3x1" to use as my "source" bucket and another called "test-bucket-3x2" as my 'destination' bucket. I did not change or modify any settings when creating these buckets. In the Lambda console, I created an s3 trigger for the 'test-bucket-3x1', changed 'event type' to "ObjectCreatedByPut", and didn't change any other settings. What changes do I need to make to my code in order to, upon uploading a file to test-bucket-3x1, a lambda function is triggered and the file is copied to test-bucket-3x2?

Learn more. Simplest lambda function to copy a file from one s3 bucket to another Ask Question. Asked 3 years ago. Active 1 month ago.

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How can I copy all objects from one Amazon S3 bucket to another bucket?

Improve this question. Tkelly Tkelly 1 1 gold badge 2 2 silver badges 9 9 bronze badges. Shouldn't you be using for obj in bucket. Refer this link: boto3. I think you might be looking to use bucket.

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Thanks for the help. It seems silly, but that was really useful for me.An AWS Lambda function to copy objects from a source S3 bucket to a target S3 bucket as they are added to the source bucket. Work fast with our official CLI. Learn more. If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. With this AWS Lambda function, you can copy objects from a source S3 bucket to one or more target S3 buckets as they are added to the source bucket.

Release packages can be found on the Releases page. TargetBucket - A space-separated list of buckets to which the objects will be copied. Optionally, the bucket names can contain a character followed by a region to indicate that the bucket resides in a different region. For example: my-target-bucket1 my-target-bucket1 us-west-2 my-target-bucket3 us-east At this point, if you upload a file to your source bucket, the file should be copied to the target bucket s.

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You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window.There are times when you need to copy objects from one S3 bucket to another. Amazon Web Services makes this simple with a little Lambda magic. The following solution copies objects from a source bucket to a destination bucket, and is triggered by successful PUT requests made to the source bucket.

For instance, you might need to run this on a schedule or trigger it for other object creation requests in addition to PUT. Everything should be in place now. You can test the Lambda function by uploading any object to your source bucket and checking to make sure the same object appears in your destination bucket. Feel free to modify this for your specific needs. View all posts by momo. You are commenting using your WordPress. You are commenting using your Google account.

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Notify me of new comments via email. Notify me of new posts via email. Show Show. Skip to content July 24, July 24, Posted in Uncategorized. Enter an appropriate policy name and description. Paste the following JSON into the policy document: 1. Share this: Twitter Facebook. Like this: Like LoadingThen, I want to make sure that the destination account owns the copied objects. How can I do that? By default, an S3 object is owned by the account that uploaded the object.

This is true even if the destination bucket is owned by another account. Object ownership is important for managing permissions using a bucket policy. For a bucket policy to apply to an object in the bucket, the object must be owned by the account that owns the bucket. To make sure that a destination account owns an S3 object copied from another account, follow these steps:.

In the source account, create an AWS Identity and Access Management IAM customer managed policy that grants an IAM identity user or role permissions for getting objects from the source bucket and putting objects into the destination bucket.

You can use an IAM policy similar to the following:. Note: This example IAM policy includes only the minimum required permissions for listing objects and copying objects across buckets in different accounts.

You must customize the allowed S3 actions according to your use case. For example, if the user must copy objects that have object tags, you must also grant permissions for s3:GetObjectTagging. In the source account, attach the customer managed policy to the IAM identity that you want to use to copy objects to the destination bucket.

In the destination account, set S3 Object Ownership on the destination bucket to bucket owner preferred. After you set S3 Object Ownershipall new objects uploaded with the access control list ACL set to bucket-owner-full-control are automatically owned by the bucket's account. In the destination account, modify the bucket policy of the destination bucket to grant the source account permissions for uploading objects.

Additionally, include a condition in the bucket policy that requires object uploads to set the ACL to bucket-owner-full-control. You can use a statement similar to the following:. Note: This example bucket policy includes only the minimum required permissions for uploading an object with the required ACL. After you configure the IAM policy and bucket policy, the IAM identity from the source account must upload objects to the destination bucket with the ACL set to bucket-owner-full-control.

With S3 Object Ownership set to bucket owner preferred, the objects uploaded with the bucket-owner-full-control ACL are automatically owned by the destination bucket's account.

How can I allow users to download from and upload to the bucket? Using a resource-based policy to delegate access to an Amazon S3 bucket in another account. Bucket owner granting cross-account bucket permissions. Last updated: To make sure that a destination account owns an S3 object copied from another account, follow these steps: 1.

For example, if the user must copy objects that have object tags, you must also grant permissions for s3:GetObjectTagging 5. Related information Using a resource-based policy to delegate access to an Amazon S3 bucket in another account Bucket owner granting cross-account bucket permissions. Did this article help? Submit feedback. Do you need billing or technical support? Contact AWS Support.


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