nbdkit S3 [access-key=...] [secret-key=...] [session-token=...] [endpoint-url=...] bucket=BUCKET key=FILENAME
nbdkit-S3-plugin is a plugin for nbdkit(1) which lets you open single files stored in Amazon S3 or Ceph as disk images.
Currently it only allows read access, although write access may be added in future.
This plugin uses the Python Amazon Web Services SDK called Boto3.
nbdkit S3 endpoint-url=https://ceph.example.com \ bucket=MY-BUCKET key=disk.img
The AWS credentials may be specified on the command line using these parameters, but it is more secure to pass them using files (see “Credentials” below).
If accessing Ceph or another compatible S3 service, provide the endpoint URL through this parameter.
The bucket containing the file. This parameter is required.
The file name within the bucket. This parameter is required.
Although AWS credentials can be passed to nbdkit on the command line, this is not secure since a user on the same machine could read them using ps(1).
A better way is to pass the credentials through the ~/.aws/credentials file. This takes the form:
[default] aws_access_key_id = XXX aws_secret_access_key = YYY [profile] aws_access_key_id = XXX aws_secret_access_key = YYY
Different profiles from the file can be selected by setting the
AWS_PROFILE environment variable.
There is much more information about credentials in the Boto3 documentation.
Compared to S3fs-Fuse
s3fs-fuse (https://github.com/s3fs-fuse/s3fs-fuse) presents a whole S3 bucket as a FUSE filesystem, with each object in the bucket corresponding to a single file. It is therefore quite different from this plugin which turns a single S3 object into a block device.
nbdkit --dump-configto find the location of
AWS credentials can be passed to boto3 using this file.
Boto3 reads some credential information from
nbdkit-S3-plugin first appeared in nbdkit 1.24.
nbdkit(1), nbdkit-plugin(3), nbdkit-python-plugin(3), https://pypi.org/project/boto3/, https://boto3.amazonaws.com/v1/documentation/api/latest/index.html, https://boto3.amazonaws.com/v1/documentation/api/latest/guide/credentials.html.
Richard W.M. Jones
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nbdkit(1), nbdkit-plugin(3), nbdkit-release-notes-1.24(1).