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s3fs

s3fs allows Linux and macOS to mount an S3 bucket via FUSE. s3fs preserves the native object format for files, allowing use of other tools like s3cmd.

Features

large subset of POSIX including reading/writing files, directories, symlinks, mode, uid/gid, and extended attributes
compatible with Amazon S3, Google Cloud Storage, and other S3-based object stores
large files via multi-part upload
renames via server-side copy
optional server-side encryption
data integrity via MD5 hashes
in-memory metadata caching
local disk data caching
user-specified regions, including Amazon GovCloud
authenticate via v2 or v4 signatures

Installation from pre-built packages

Some systems provide pre-built packages:

On Debian 9 and Ubuntu 16.04 or newer:
```
sudo apt-get install s3fs
```
On SUSE 12 or newer and openSUSE 42.1 or newer:
```
sudo zypper in s3fs
```
On Fedora 27 and newer:
```
sudo yum install s3fs-fuse
```

On RHEL/CentOS 7 and newer through EPEL repositories:

sudo yum install epel-release
sudo yum install s3fs-fuse

On macOS, install via Homebrew:

$ brew cask install osxfuse
$ brew install s3fs

Compilation and installation from sources

These are generic instructions to compile from the master branch, and should work on almost any GNU/Linux, macOS, BSD, or similar.

If you want specific instructions for some distributions, check the wiki.

Keep in mind using the pre-built packages when available.

Ensure your system satisfies build and runtime dependencies for:
- fuse >= 2.8.4
- automake
- gcc-c++
- make
- libcurl
- libxml2
- openssl

Then compile from master via the following commands:

git clone https://github.com/s3fs-fuse/s3fs-fuse.git
cd s3fs-fuse
./autogen.sh
./configure
make
sudo make install

Examples

s3fs supports the standard AWS credentials file stored in ${HOME}/.aws/credentials. Alternatively, s3fs supports a custom passwd file.

The default location for the s3fs password file can be created:

using a .passwd-s3fs file in the users home directory (i.e. ${HOME}/.passwd-s3fs)
using the system-wide /etc/passwd-s3fs file

Enter your credentials in a file ${HOME}/.passwd-s3fs and set owner-only permissions:

echo ACCESS_KEY_ID:SECRET_ACCESS_KEY > ${HOME}/.passwd-s3fs
chmod 600 ${HOME}/.passwd-s3fs

Run s3fs with an existing bucket mybucket and directory /path/to/mountpoint:

s3fs mybucket /path/to/mountpoint -o passwd_file=${HOME}/.passwd-s3fs

If you encounter any errors, enable debug output:

s3fs mybucket /path/to/mountpoint -o passwd_file=${HOME}/.passwd-s3fs -o dbglevel=info -f -o curldbg

You can also mount on boot by entering the following line to /etc/fstab:

s3fs#mybucket /path/to/mountpoint fuse _netdev,allow_other 0 0

mybucket /path/to/mountpoint fuse.s3fs _netdev,allow_other 0 0

If you use s3fs with a non-Amazon S3 implementation, specify the URL and path-style requests:

s3fs mybucket /path/to/mountpoint -o passwd_file=${HOME}/.passwd-s3fs -o url=http://url.to.s3/ -o use_path_request_style

or(fstab)

s3fs#mybucket /path/to/mountpoint fuse _netdev,allow_other,use_path_request_style,url=http://url.to.s3/ 0 0

To use IBM IAM Authentication, use the -o ibm_iam_auth option, and specify the Service Instance ID and API Key in your credentials file:

echo SERVICEINSTANCEID:APIKEY > /path/to/passwd

The Service Instance ID is only required when using the -o create_bucket option.

Note: You may also want to create the global credential file first

echo ACCESS_KEY_ID:SECRET_ACCESS_KEY > /etc/passwd-s3fs
chmod 600 /etc/passwd-s3fs

Note2: You may also need to make sure netfs service is start on boot

Limitations

Generally S3 cannot offer the same performance or semantics as a local file system. More specifically:

random writes or appends to files require rewriting the entire file
metadata operations such as listing directories have poor performance due to network latency
eventual consistency can temporarily yield stale data(Amazon S3 Data Consistency Model)
no atomic renames of files or directories
no coordination between multiple clients mounting the same bucket
no hard links

References

goofys - similar to s3fs but has better performance and less POSIX compatibility
s3backer - mount an S3 bucket as a single file
S3Proxy - combine with s3fs to mount Backblaze B2, EMC Atmos, Microsoft Azure, and OpenStack Swift buckets
s3ql - similar to s3fs but uses its own object format
YAS3FS - similar to s3fs but uses SNS to allow multiple clients to mount a bucket

Frequently Asked Questions

License

Licensed under the GNU GPL version 2

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