NAME

       nbdkit-S3-plugin - open disk images stored in Amazon S3 or Ceph

SYNOPSIS

        nbdkit S3 [access-key=...] [secret-key=...] [session-token=...]
                  [endpoint-url=...]
                  bucket=BUCKET key=FILENAME

DESCRIPTION

       "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.

EXAMPLE

        nbdkit S3 endpoint-url=https://ceph.example.com \
                  bucket=MY-BUCKET key=disk.img

PARAMETERS

       access-key=ACCESS_KEY
       secret-key=SECRET_KEY
       session-token=SESSION_TOKEN
           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).

       endpoint-url=ENDPOINT
           If accessing Ceph or another compatible S3 service, provide the endpoint URL through
           this parameter.

       bucket=BUCKET
           The bucket containing the file.  This parameter is required.

       key=FILENAME
           The file name within the bucket.  This parameter is required.

CREDENTIALS

       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.

FILES

       $plugindir/nbdkit-S3-plugin
           The plugin.

           Use "nbdkit --dump-config" to find the location of $plugindir.

       $HOME/.aws/credentials
           AWS credentials can be passed to boto3 using this file.

ENVIRONMENT VARIABLES

       "AWS_*"
           Boto3 reads some credential information from "AWS_*" environment variables.

VERSION

       "nbdkit-S3-plugin" first appeared in nbdkit 1.24.

SEE ALSO

       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.

AUTHORS

       Richard W.M. Jones

COPYRIGHT

       Copyright (C) 2020 Red Hat Inc.

LICENSE

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       permitted provided that the following conditions are met:

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       •   Neither the name of Red Hat nor the names of its contributors may be used to endorse
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