DOKK / manpages / debian 10 / s3fs / s3fs.1.en
S3FS(1) User Commands S3FS(1)

S3FS - FUSE-based file system backed by Amazon S3

For root.
For unprivileged user.

s3fs is a FUSE filesystem that allows you to mount an Amazon S3 bucket as a local filesystem. It stores files natively and transparently in S3 (i.e., you can use other programs to access the same files).

The s3fs password file has this format (use this format if you have only one set of credentials):

accessKeyId:secretAccessKey

If you have more than one set of credentials, this syntax is also recognized:

bucketName:accessKeyId:secretAccessKey

Password files can be stored in two locations:


/etc/passwd-s3fs [0640]
$HOME/.passwd-s3fs [0600]

print help
  --version
print version
FUSE foreground option - do not run as daemon.
FUSE singlethreaded option (disables multi-threaded operation)


<option_name>=<option_value>
if it is not specified bucket name(and path) in command line, must specify this option after -o option for bucket name.
the default canned acl to apply to all written s3 objects, e.g., "private", "public-read". empty string means do not send header. see http://aws.amazon.com/documentation/s3/ for the full list of canned acls.
number of times to retry a failed S3 transaction.
local folder to use for local file cache.
If use_cache is set, check if the cache directory exists. If this option is not specified, it will be created at runtime when the cache directory does not exist.
delete local file cache when s3fs starts and exits.
store object with specified storage class. this option replaces the old option use_rrs. Possible values: standard, standard_ia, and reduced_redundancy.
use Amazon's Reduced Redundancy Storage. this option can not be specified with use_sse. (can specify use_rrs=1 for old version) this option has been replaced by new storage_class option.
Specify three type Amazon's Server-Site Encryption: SSE-S3, SSE-C or SSE-KMS. SSE-S3 uses Amazon S3-managed encryption keys, SSE-C uses customer-provided encryption keys, and SSE-KMS uses the master key which you manage in AWS KMS. You can specify "use_sse" or "use_sse=1" enables SSE-S3 type (use_sse=1 is old type parameter). Case of setting SSE-C, you can specify "use_sse=custom", "use_sse=custom:<custom key file path>" or "use_sse=<custom key file path>"(only <custom key file path> specified is old type parameter). You can use "c" for short "custom". The custom key file must be 600 permission. The file can have some lines, each line is one SSE-C key. The first line in file is used as Customer-Provided Encryption Keys for uploading and changing headers etc. If there are some keys after first line, those are used downloading object which are encrypted by not first key. So that, you can keep all SSE-C keys in file, that is SSE-C key history. If you specify "custom"("c") without file path, you need to set custom key by load_sse_c option or AWSSSECKEYS environment.(AWSSSECKEYS environment has some SSE-C keys with ":" separator.) This option is used to decide the SSE type. So that if you do not want to encrypt a object at uploading, but you need to decrypt encrypted object at downloading, you can use load_sse_c option instead of this option. For setting SSE-KMS, specify "use_sse=kmsid" or "use_sse=kmsid:<kms id>". You can use "k" for short "kmsid". If you san specify SSE-KMS type with your <kms id> in AWS KMS, you can set it after "kmsid:"(or "k:"). If you specify only "kmsid"("k"), you need to set AWSSSEKMSID environment which value is <kms id>. You must be careful about that you can not use the KMS id which is not same EC2 region.
Specify the custom-provided encryption keys file path for decrypting at downloading. If you use the custom-provided encryption key at uploading, you specify with "use_sse=custom". The file has many lines, one line means one custom key. So that you can keep all SSE-C keys in file, that is SSE-C key history. AWSSSECKEYS environment is as same as this file contents.
specify the path to the password file, which which takes precedence over the password in $HOME/.passwd-s3fs and /etc/passwd-s3fs
This option specifies the configuration file path which file is the additional HTTP header by file(object) extension.
The configuration file format is below:
-----------
line = [file suffix or regex] HTTP-header [HTTP-values]
file suffix = file(object) suffix, if this field is empty, it means "reg:(.*)".(=all object).
regex = regular expression to match the file(object) path. this type starts with "reg:" prefix.
HTTP-header = additional HTTP header name
HTTP-values = additional HTTP header value
-----------
Sample:
-----------
.gz Content-Encoding gzip
.Z Content-Encoding compress
reg:^/MYDIR/(.*)[.]t2$ Content-Encoding text2
-----------
A sample configuration file is uploaded in "test" directory. If you specify this option for set "Content-Encoding" HTTP header, please take care for RFC 2616.
anonymously mount a public bucket when set to 1, ignores the $HOME/.passwd-s3fs and /etc/passwd-s3fs files. S3 does not allow copy object api for anonymous users, then s3fs sets nocopyapi option automatically when public_bucket=1 option is specified.
time to wait for connection before giving up.
time to wait between read/write activity before giving up.
specify the maximum number of keys returned by S3 list object API. The default is 1000. you can set this value to 1000 or more.
maximum number of entries in the stat cache
specify expire time(seconds) for entries in the stat cache. This expire time indicates the time since stat cached.
specify expire time(seconds) for entries in the stat cache. This expire time is based on the time from the last access time of the stat cache. This option is exclusive with stat_cache_expire, and is left for compatibility with older versions.
enable cache entries for the object which does not exist. s3fs always has to check whether file(or sub directory) exists under object(path) when s3fs does some command, since s3fs has recognized a directory which does not exist and has files or sub directories under itself. It increases ListBucket request and makes performance bad. You can specify this option for performance, s3fs memorizes in stat cache that the object(file or directory) does not exist.
do not check ssl certificate. server certificate won't be checked against the available certificate authorities.
s3fs is always using dns cache, this option make dns cache disable.
s3fs is always using ssl session cache, this option make ssl session cache disable.
maximum number of parallel request for listing objects.
number of parallel request for uploading big objects. s3fs uploads large object(default:over 20MB) by multipart post request, and sends parallel requests. This option limits parallel request count which s3fs requests at once. It is necessary to set this value depending on a CPU and a network band.
number of one part size in multipart uploading request. The default size is 10MB(10485760byte), minimum value is 5MB(5242880byte). Specify number of MB and over 5(MB).
sets MB to ensure disk free space. This option means the threshold of free space size on disk which is used for the cache file by s3fs. s3fs makes file for downloading, and uploading and caching files. If the disk free space is smaller than this value, s3fs do not use diskspace as possible in exchange for the performance.
sets the url to use to access Amazon S3. If you want to use HTTP, then you can set "url=http://s3.amazonaws.com". If you do not use https, please specify the URL with the url option.
sets the endpoint to use. If this option is not specified, s3fs uses "us-east-1" region as the default. If the s3fs could not connect to the region specified by this option, s3fs could not run. But if you do not specify this option, and if you can not connect with the default region, s3fs will retry to automatically connect to the other region. So s3fs can know the correct region name, because s3fs can find it in an error from the S3 server.
sets signing AWS requests by sing Signature Version 2.
sets umask for the mount point directory. If allow_other option is not set, s3fs allows access to the mount point only to the owner. In the opposite case s3fs allows access to all users as the default. But if you set the allow_other with this option, you can control permissions of the mount point by this option like umask.
verifying uploaded data without multipart by content-md5 header. Enable to send "Content-MD5" header when uploading a object without multipart posting. If this option is enabled, it has some influences on a performance of s3fs when uploading small object. Because s3fs always checks MD5 when uploading large object, this option does not affect on large object.
This option instructs s3fs to query the ECS container credential metadata address instead of the instance metadata address.
This option requires the IAM role name or "auto". If you specify "auto", s3fs will automatically use the IAM role names that are set to an instance. If you specify this option without any argument, it is the same as that you have specified the "auto".
This option instructs s3fs to use IBM IAM authentication. In this mode, the AWSAccessKey and AWSSecretKey will be used as IBM's Service-Instance-ID and APIKey, respectively.
Set the URL to use for IBM IAM authentication.
Enable to handle the extended attribute(xattrs). If you set this option, you can use the extended attribute. For example, encfs and ecryptfs need to support the extended attribute. Notice: if s3fs handles the extended attribute, s3fs can not work to copy command with preserve=mode.
disable registering xml name space for response of ListBucketResult and ListVersionsResult etc. Default name space is looked up from "http://s3.amazonaws.com/doc/2006-03-01". This option should not be specified now, because s3fs looks up xmlns automatically after v1.66.
For a distributed object storage which is compatibility S3 API without PUT(copy api). If you set this option, s3fs do not use PUT with "x-amz-copy-source"(copy api). Because traffic is increased 2-3 times by this option, we do not recommend this.
For a distributed object storage which is compatibility S3 API without PUT(copy api). This option is a subset of nocopyapi option. The nocopyapi option does not use copy-api for all command(ex. chmod, chown, touch, mv, etc), but this option does not use copy-api for only rename command(ex. mv). If this option is specified with nocopyapi, then s3fs ignores it.
Enable compatibility with S3-like APIs which do not support the virtual-host request style, by using the older path request style.
Usually s3fs outputs of the User-Agent in "s3fs/<version> (commit hash <hash>; <using ssl library name>)" format. If this option is specified, s3fs suppresses the output of the User-Agent.
Customize TLS cipher suite list. Expects a colon separated list of cipher suite names. A list of available cipher suites, depending on your TLS engine, can be found on the CURL library documentation: https://curl.haxx.se/docs/ssl-ciphers.html
The instance name of the current s3fs mountpoint. This name will be added to logging messages and user agent headers sent by s3fs.
s3fs complements lack of information about file/directory mode if a file or a directory object does not have x-amz-meta-mode header. As default, s3fs does not complements stat information for a object, then the object will not be able to be allowed to list/modify.
As a default, s3fs supports objects of the directory type as much as possible and recognizes them as directories. Objects that can be recognized as directory objects are "dir/", "dir", "dir_$folder$", and there is a file object that does not have a directory object but contains that directory path. s3fs needs redundant communication to support all these directory types. The object as the directory created by s3fs is "dir/". By restricting s3fs to recognize only "dir/" as a directory, communication traffic can be reduced. This option is used to give this restriction to s3fs. However, if there is a directory object other than "dir/" in the bucket, specifying this option is not recommended. s3fs may not be able to recognize the object correctly if an object created by s3fs exists in the bucket. Please use this option when the directory in the bucket is only "dir/" object.
Set the debug message level. set value as crit(critical), err(error), warn(warning), info(information) to debug level. default debug level is critical. If s3fs run with "-d" option, the debug level is set information. When s3fs catch the signal SIGUSR2, the debug level is bumpup.
Put the debug message from libcurl when this option is specified.

Due to S3's "eventual consistency" limitations, file creation can and will occasionally fail. Even after a successful create, subsequent reads can fail for an indeterminate time, even after one or more successful reads. Create and read enough files and you will eventually encounter this failure. This is not a flaw in s3fs and it is not something a FUSE wrapper like s3fs can work around. The retries option does not address this issue. Your application must either tolerate or compensate for these failures, for example by retrying creates or reads.

s3fs has been written by Randy Rizun <rrizun@gmail.com>.

February 2011 S3FS