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rclone/docs/content/commands/rclone_mount.md
Nick Craig-Wood f544234e26 gendocs: remove global flags from command help pages
2019-05-11 23:39:50 +01:00

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---
date: 2019-05-10T23:12:21+01:00
title: "rclone mount"
slug: rclone_mount
url: /commands/rclone_mount/
---
## rclone mount
Mount the remote as file system on a mountpoint.
### Synopsis
rclone mount allows Linux, FreeBSD, macOS and Windows to
mount any of Rclone's cloud storage systems as a file system with
FUSE.
First set up your remote using `rclone config`. Check it works with `rclone ls` etc.
Start the mount like this
rclone mount remote:path/to/files /path/to/local/mount
Or on Windows like this where X: is an unused drive letter
rclone mount remote:path/to/files X:
When the program ends, either via Ctrl+C or receiving a SIGINT or SIGTERM signal,
the mount is automatically stopped.
The umount operation can fail, for example when the mountpoint is busy.
When that happens, it is the user's responsibility to stop the mount manually with
# Linux
fusermount -u /path/to/local/mount
# OS X
umount /path/to/local/mount
### Installing on Windows
To run rclone mount on Windows, you will need to
download and install [WinFsp](http://www.secfs.net/winfsp/).
WinFsp is an [open source](https://github.com/billziss-gh/winfsp)
Windows File System Proxy which makes it easy to write user space file
systems for Windows. It provides a FUSE emulation layer which rclone
uses combination with
[cgofuse](https://github.com/billziss-gh/cgofuse). Both of these
packages are by Bill Zissimopoulos who was very helpful during the
implementation of rclone mount for Windows.
#### Windows caveats
Note that drives created as Administrator are not visible by other
accounts (including the account that was elevated as
Administrator). So if you start a Windows drive from an Administrative
Command Prompt and then try to access the same drive from Explorer
(which does not run as Administrator), you will not be able to see the
new drive.
The easiest way around this is to start the drive from a normal
command prompt. It is also possible to start a drive from the SYSTEM
account (using [the WinFsp.Launcher
infrastructure](https://github.com/billziss-gh/winfsp/wiki/WinFsp-Service-Architecture))
which creates drives accessible for everyone on the system or
alternatively using [the nssm service manager](https://nssm.cc/usage).
### Limitations
Without the use of "--vfs-cache-mode" this can only write files
sequentially, it can only seek when reading. This means that many
applications won't work with their files on an rclone mount without
"--vfs-cache-mode writes" or "--vfs-cache-mode full". See the [File
Caching](#file-caching) section for more info.
The bucket based remotes (eg Swift, S3, Google Compute Storage, B2,
Hubic) won't work from the root - you will need to specify a bucket,
or a path within the bucket. So `swift:` won't work whereas
`swift:bucket` will as will `swift:bucket/path`.
None of these support the concept of directories, so empty
directories will have a tendency to disappear once they fall out of
the directory cache.
Only supported on Linux, FreeBSD, OS X and Windows at the moment.
### rclone mount vs rclone sync/copy
File systems expect things to be 100% reliable, whereas cloud storage
systems are a long way from 100% reliable. The rclone sync/copy
commands cope with this with lots of retries. However rclone mount
can't use retries in the same way without making local copies of the
uploads. Look at the [file caching](#file-caching)
for solutions to make mount more reliable.
### Attribute caching
You can use the flag --attr-timeout to set the time the kernel caches
the attributes (size, modification time etc) for directory entries.
The default is "1s" which caches files just long enough to avoid
too many callbacks to rclone from the kernel.
In theory 0s should be the correct value for filesystems which can
change outside the control of the kernel. However this causes quite a
few problems such as
[rclone using too much memory](https://github.com/ncw/rclone/issues/2157),
[rclone not serving files to samba](https://forum.rclone.org/t/rclone-1-39-vs-1-40-mount-issue/5112)
and [excessive time listing directories](https://github.com/ncw/rclone/issues/2095#issuecomment-371141147).
The kernel can cache the info about a file for the time given by
"--attr-timeout". You may see corruption if the remote file changes
length during this window. It will show up as either a truncated file
or a file with garbage on the end. With "--attr-timeout 1s" this is
very unlikely but not impossible. The higher you set "--attr-timeout"
the more likely it is. The default setting of "1s" is the lowest
setting which mitigates the problems above.
If you set it higher ('10s' or '1m' say) then the kernel will call
back to rclone less often making it more efficient, however there is
more chance of the corruption issue above.
If files don't change on the remote outside of the control of rclone
then there is no chance of corruption.
This is the same as setting the attr_timeout option in mount.fuse.
### Filters
Note that all the rclone filters can be used to select a subset of the
files to be visible in the mount.
### systemd
When running rclone mount as a systemd service, it is possible
to use Type=notify. In this case the service will enter the started state
after the mountpoint has been successfully set up.
Units having the rclone mount service specified as a requirement
will see all files and folders immediately in this mode.
### chunked reading ###
--vfs-read-chunk-size will enable reading the source objects in parts.
This can reduce the used download quota for some remotes by requesting only chunks
from the remote that are actually read at the cost of an increased number of requests.
When --vfs-read-chunk-size-limit is also specified and greater than --vfs-read-chunk-size,
the chunk size for each open file will get doubled for each chunk read, until the
specified value is reached. A value of -1 will disable the limit and the chunk size will
grow indefinitely.
With --vfs-read-chunk-size 100M and --vfs-read-chunk-size-limit 0 the following
parts will be downloaded: 0-100M, 100M-200M, 200M-300M, 300M-400M and so on.
When --vfs-read-chunk-size-limit 500M is specified, the result would be
0-100M, 100M-300M, 300M-700M, 700M-1200M, 1200M-1700M and so on.
Chunked reading will only work with --vfs-cache-mode < full, as the file will always
be copied to the vfs cache before opening with --vfs-cache-mode full.
### Directory Cache
Using the `--dir-cache-time` flag, you can set how long a
directory should be considered up to date and not refreshed from the
backend. Changes made locally in the mount may appear immediately or
invalidate the cache. However, changes done on the remote will only
be picked up once the cache expires.
Alternatively, you can send a `SIGHUP` signal to rclone for
it to flush all directory caches, regardless of how old they are.
Assuming only one rclone instance is running, you can reset the cache
like this:
kill -SIGHUP $(pidof rclone)
If you configure rclone with a [remote control](/rc) then you can use
rclone rc to flush the whole directory cache:
rclone rc vfs/forget
Or individual files or directories:
rclone rc vfs/forget file=path/to/file dir=path/to/dir
### File Buffering
The `--buffer-size` flag determines the amount of memory,
that will be used to buffer data in advance.
Each open file descriptor will try to keep the specified amount of
data in memory at all times. The buffered data is bound to one file
descriptor and won't be shared between multiple open file descriptors
of the same file.
This flag is a upper limit for the used memory per file descriptor.
The buffer will only use memory for data that is downloaded but not
not yet read. If the buffer is empty, only a small amount of memory
will be used.
The maximum memory used by rclone for buffering can be up to
`--buffer-size * open files`.
### File Caching
These flags control the VFS file caching options. The VFS layer is
used by rclone mount to make a cloud storage system work more like a
normal file system.
You'll need to enable VFS caching if you want, for example, to read
and write simultaneously to a file. See below for more details.
Note that the VFS cache works in addition to the cache backend and you
may find that you need one or the other or both.
--cache-dir string Directory rclone will use for caching.
--vfs-cache-max-age duration Max age of objects in the cache. (default 1h0m0s)
--vfs-cache-mode string Cache mode off|minimal|writes|full (default "off")
--vfs-cache-poll-interval duration Interval to poll the cache for stale objects. (default 1m0s)
--vfs-cache-max-size int Max total size of objects in the cache. (default off)
If run with `-vv` rclone will print the location of the file cache. The
files are stored in the user cache file area which is OS dependent but
can be controlled with `--cache-dir` or setting the appropriate
environment variable.
The cache has 4 different modes selected by `--vfs-cache-mode`.
The higher the cache mode the more compatible rclone becomes at the
cost of using disk space.
Note that files are written back to the remote only when they are
closed so if rclone is quit or dies with open files then these won't
get written back to the remote. However they will still be in the on
disk cache.
If using --vfs-cache-max-size note that the cache may exceed this size
for two reasons. Firstly because it is only checked every
--vfs-cache-poll-interval. Secondly because open files cannot be
evicted from the cache.
#### --vfs-cache-mode off
In this mode the cache will read directly from the remote and write
directly to the remote without caching anything on disk.
This will mean some operations are not possible
* Files can't be opened for both read AND write
* Files opened for write can't be seeked
* Existing files opened for write must have O_TRUNC set
* Files open for read with O_TRUNC will be opened write only
* Files open for write only will behave as if O_TRUNC was supplied
* Open modes O_APPEND, O_TRUNC are ignored
* If an upload fails it can't be retried
#### --vfs-cache-mode minimal
This is very similar to "off" except that files opened for read AND
write will be buffered to disks. This means that files opened for
write will be a lot more compatible, but uses the minimal disk space.
These operations are not possible
* Files opened for write only can't be seeked
* Existing files opened for write must have O_TRUNC set
* Files opened for write only will ignore O_APPEND, O_TRUNC
* If an upload fails it can't be retried
#### --vfs-cache-mode writes
In this mode files opened for read only are still read directly from
the remote, write only and read/write files are buffered to disk
first.
This mode should support all normal file system operations.
If an upload fails it will be retried up to --low-level-retries times.
#### --vfs-cache-mode full
In this mode all reads and writes are buffered to and from disk. When
a file is opened for read it will be downloaded in its entirety first.
This may be appropriate for your needs, or you may prefer to look at
the cache backend which does a much more sophisticated job of caching,
including caching directory hierarchies and chunks of files.
In this mode, unlike the others, when a file is written to the disk,
it will be kept on the disk after it is written to the remote. It
will be purged on a schedule according to `--vfs-cache-max-age`.
This mode should support all normal file system operations.
If an upload or download fails it will be retried up to
--low-level-retries times.
```
rclone mount remote:path /path/to/mountpoint [flags]
```
### Options
```
--allow-non-empty Allow mounting over a non-empty directory.
--allow-other Allow access to other users.
--allow-root Allow access to root user.
--attr-timeout duration Time for which file/directory attributes are cached. (default 1s)
--daemon Run mount as a daemon (background mode).
--daemon-timeout duration Time limit for rclone to respond to kernel (not supported by all OSes).
--debug-fuse Debug the FUSE internals - needs -v.
--default-permissions Makes kernel enforce access control based on the file mode.
--dir-cache-time duration Time to cache directory entries for. (default 5m0s)
--dir-perms FileMode Directory permissions (default 0777)
--file-perms FileMode File permissions (default 0666)
--fuse-flag stringArray Flags or arguments to be passed direct to libfuse/WinFsp. Repeat if required.
--gid uint32 Override the gid field set by the filesystem. (default 502)
-h, --help help for mount
--max-read-ahead SizeSuffix The number of bytes that can be prefetched for sequential reads. (default 128k)
--no-checksum Don't compare checksums on up/download.
--no-modtime Don't read/write the modification time (can speed things up).
--no-seek Don't allow seeking in files.
-o, --option stringArray Option for libfuse/WinFsp. Repeat if required.
--poll-interval duration Time to wait between polling for changes. Must be smaller than dir-cache-time. Only on supported remotes. Set to 0 to disable. (default 1m0s)
--read-only Mount read-only.
--uid uint32 Override the uid field set by the filesystem. (default 502)
--umask int Override the permission bits set by the filesystem.
--vfs-cache-max-age duration Max age of objects in the cache. (default 1h0m0s)
--vfs-cache-max-size SizeSuffix Max total size of objects in the cache. (default off)
--vfs-cache-mode CacheMode Cache mode off|minimal|writes|full (default off)
--vfs-cache-poll-interval duration Interval to poll the cache for stale objects. (default 1m0s)
--vfs-read-chunk-size SizeSuffix Read the source objects in chunks. (default 128M)
--vfs-read-chunk-size-limit SizeSuffix If greater than --vfs-read-chunk-size, double the chunk size after each chunk read, until the limit is reached. 'off' is unlimited. (default off)
--volname string Set the volume name (not supported by all OSes).
--write-back-cache Makes kernel buffer writes before sending them to rclone. Without this, writethrough caching is used.
```
### SEE ALSO
* [rclone](/commands/rclone/) - Show help for rclone commands, flags and backends.
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