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This special remote type stores file contents in a bucket in Amazon S3
or a similar service.
See [[tips/using_Amazon_S3]] and
[[tips/Internet_Archive_via_S3]] for usage examples.
## configuration
The standard environment variables `AWS_ACCESS_KEY_ID` and
`AWS_SECRET_ACCESS_KEY` are used to supply login credentials
for Amazon. When encryption is enabled, they are stored in encrypted form
by `git annex initremote`. Without encryption, they are stored in a
file only you can read inside the local git repository. So you do not
need to keep the environment variables set after the initial
initalization of the remote.
A number of parameters can be passed to `git annex initremote` to configure
the S3 remote.
* `encryption` - Required. Either "none" to disable encryption
(not recommended),
or a value that can be looked up (using gpg -k) to find a gpg encryption
key that will be given access to the remote. Note that additional gpg
keys can be given access to a remote by rerunning initremote with
the new key id. See [[encryption]].
* `datacenter` - Defaults to "US". Other values include "EU",
"us-west-1", and "ap-southeast-1".
* `storageclass` - Default is "STANDARD". If you have configured git-annex
to preserve multiple [[copies]], consider setting this to "REDUCED_REDUNDANCY"
to save money.
* `host` and `port` - Specify in order to use a different, S3 compatable
service.
* `bucket` - S3 requires that buckets have a globally unique name,
so by default, a bucket name is chosen based on the remote name
and UUID. This can be specified to pick a bucket name.
* `fileprefix` - By default, git-annex places files in a tree rooted at the
top of the S3 bucket. When this is set, it's prefixed to the filenames
used. For example, you could set it to "foo/" in one special remote,
and to "bar/" in another special remote, and both special remotes could
then use the same bucket.
* `x-amz-*` are passed through as http headers when storing keys
in S3.
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