s3fs-fuse/README.md

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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 [AWS CLI](https://github.com/aws/aws-cli).
[![Build Status](https://travis-ci.org/s3fs-fuse/s3fs-fuse.svg?branch=master)](https://travis-ci.org/s3fs-fuse/s3fs-fuse)
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
------------------------------------
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Some systems provide pre-built packages:
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* 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
```
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* On RHEL/CentOS 7 and newer through EPEL repositories:
```
sudo yum install epel-release
sudo yum install s3fs-fuse
```
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* On Amazon Linux through EPEL repositories:
```
sudo amazon-linux-extras install epel
sudo yum install s3fs-fuse
```
* On macOS, install via [Homebrew](https://brew.sh/):
```
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](https://github.com/s3fs-fuse/s3fs-fuse/wiki/Installation-Notes).
Keep in mind using the pre-built packages when available.
1. Ensure your system satisfies build and runtime dependencies for:
* fuse >= 2.8.4
* automake
* gcc-c++
* make
* libcurl
* libxml2
* openssl
2. 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](https://docs.aws.amazon.com/cli/latest/userguide/cli-config-files.html)
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
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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=${HOME}/.passwd-s3fs -o dbglevel=info -f -o curldbg
```
You can also mount on boot by entering the following line to `/etc/fstab`:
```
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s3fs#mybucket /path/to/mountpoint fuse _netdev,allow_other 0 0
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```
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or
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```
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mybucket /path/to/mountpoint fuse.s3fs _netdev,allow_other 0 0
```
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If you use s3fs with a non-Amazon S3 implementation, specify the URL and path-style requests:
```
s3fs mybucket /path/to/mountpoint -o passwd_file=${HOME}/.passwd-s3fs -o url=https://url.to.s3/ -o use_path_request_style
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```
or(fstab)
```
s3fs#mybucket /path/to/mountpoint fuse _netdev,allow_other,use_path_request_style,url=https://url.to.s3/ 0 0
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```
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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.
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Note: You may also want to create the global credential file first
```
echo ACCESS_KEY_ID:SECRET_ACCESS_KEY > /etc/passwd-s3fs
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chmod 600 /etc/passwd-s3fs
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```
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Note2: You may also need to make sure `netfs` service is start on boot
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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](https://en.wikipedia.org/wiki/Eventual_consistency) can temporarily yield stale data([Amazon S3 Data Consistency Model](https://docs.aws.amazon.com/AmazonS3/latest/dev/Introduction.html#ConsistencyModel))
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* no atomic renames of files or directories
* no coordination between multiple clients mounting the same bucket
* no hard links
* inotify detects only local modifications, not external ones by other clients or tools
References
----------
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* [goofys](https://github.com/kahing/goofys) - similar to s3fs but has better performance and less POSIX compatibility
* [s3backer](https://github.com/archiecobbs/s3backer) - mount an S3 bucket as a single file
* [S3Proxy](https://github.com/gaul/s3proxy) - combine with s3fs to mount Backblaze B2, EMC Atmos, Microsoft Azure, and OpenStack Swift buckets
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* [s3ql](https://github.com/s3ql/s3ql/) - similar to s3fs but uses its own object format
* [YAS3FS](https://github.com/danilop/yas3fs) - similar to s3fs but uses SNS to allow multiple clients to mount a bucket
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Frequently Asked Questions
--------------------------
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* [FAQ wiki page](https://github.com/s3fs-fuse/s3fs-fuse/wiki/FAQ)
* [s3fs on Stack Overflow](https://stackoverflow.com/questions/tagged/s3fs)
* [s3fs on Server Fault](https://serverfault.com/questions/tagged/s3fs)
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License
-------
Copyright (C) 2010 Randy Rizun <rrizun@gmail.com>
Licensed under the GNU GPL version 2
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