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update sshfs

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technology/linux/filesystems/SSHFS.md
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@ -1,7 +1,9 @@
---
arch-wiki: https://wiki.archlinux.org/title/SSHFS
obj: filesystem
rev: 2024-08-26
---
# SSHFS
SSHFS is a FUSE Filesystem based on the [SSH](../../applications/network/SSH.md) and SFTP Protocol.
@ -17,10 +19,30 @@ user@host:/remote/path /local/path fuse.sshfs noauto,x-systemd.automount,_netde
```
## Options
```
-p [PORT] - SSH Port
-C - Compression
-o reconnect - reconnect
-o idmap=TYPE - TYPE = none, user, file | Map UID and GIDs
-o follow_symlinks - Symlinks
```
| Option | Description |
| ------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `-p PORT` | SSH Port, equivalent to `-o port=PORT` |
| `-f` | do not daemonize, stay in foreground. |
| `-s` | Single threaded operation. |
| `-C` | Enable Compression, equivalent to `-o compression=yes` |
| `-F ssh_configfile` | specifies alternative ssh configuration file |
| `-o reconnect` | automatically reconnect to server if connection is interrupted. Attempts to access files that were opened before the reconnection will give errors and need to be re-opened. |
| `-o delay_connect` | Don't immediately connect to server, wait until mountpoint is first accessed. |
| `-o sshfs_sync` | synchronous writes. This will slow things down, but may be useful in some situations. |
| `-o no_readahead` | Only read exactly the data that was requested, instead of speculatively reading more to anticipate the next read request. |
| `-o sync_readdir` | synchronous readdir. This will slow things down, but may be useful in some situations. |
| `-o idmap=TYPE` | How to map remote UID/GIDs to local values. `none`: no translation of the ID space (default). `user`: map the UID/GID of the remote user to UID/GID of the mounting user. `file`: translate UIDs/GIDs based upon the contents of `--uidfile` and `--gidfile`. |
| `-o uidfile=FILE` | file containing username:uid mappings for `-o idmap=file` |
| `-o gidfile=FILE` | file containing groupname:gid mappings for `-o idmap=file` |
| `-o ssh_command=CMD` | execute CMD instead of 'ssh' |
| `-o transform_symlinks` | transform absolute symlinks on remote side to relative symlinks. This means that if e.g. on the server side `/foo/bar/com` is a symlink to `/foo/blub`, SSHFS will transform the link target to `../blub` on the client side. |
| `-o follow_symlinks` | follow symlinks on the server, i.e. present them as regular files on the client. If a symlink is dangling (i.e, the target does not exist) the behavior depends on the remote server - the entry may appear as a symlink on the client, or it may appear as a regular file that cannot be accessed. |
| `-o no_check_root` | don't check for existence of 'dir' on server |
| `-o dir_cache=BOOL` | Enables (yes) or disables (no) the SSHFS directory cache. The directory cache holds the names of directory entries. Enabling it allows readdir system calls to be processed without network access. |
| `-o dcache_max_size=N` | sets the maximum size of the directory cache. |
| `-o dcache_timeout=N` | sets timeout for directory cache in seconds. |
| `-o dcache_{stat,link,dir}_timeout=N` | sets separate timeout for {attributes, symlinks, names} in the directory cache. |
| `-o dcache_clean_interval=N` | sets the interval for automatic cleaning of the directory cache. |
| `-o dcache_min_clean_interval=N` | sets the interval for forced cleaning of the directory cache when full. |
| `-o direct_io` | This option disables the use of page cache (file content cache) in the kernel for this filesystem. |
| `-o max_conns=N` | sets the maximum number of simultaneous SSH connections to use. Each connection is established with a separate SSH process. The primary purpose of this feature is to improve the responsiveness of the file system during large file transfers. |