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Command Reference

JuiceFS provides many commands to help you manage your filesystem. This page provides a detailed reference for these commands.

Overview

If you run juicefs by itself, it will print all the available subcommands. In addition, you can add -h/--help flag after each subcommand to get help information of that subcommand.

juicefs COMMAND [options]

COMMAND could be:
auth authorize a filesystem
mount mount a filesystem
umount umount a filesystem
info show information of file or directory
lsof list recent opened files
import import files from existing object storage
rmr remove all files/directories recursively
snapshot create or remove snapshots
grep parallelized file pattern searcher
profile analyze log (Experimental)
benchmark run benchmark
warmup build cache for target directories/files
version show the version

Usage: juicefs [COMMAND] [options]

Add -h or --help after all commands, getting arguments list and help information.

Note: If juicefs is not placed in your $PATH, you should run the script with the path to the script. For example, if juicefs is placed in current directory, you should use ./juicefs. It is recommended to place juicefs in your $PATH for the convenience.

The documentation below gives you detailed information about each subcommand.

juicefs auth

Description

Set up the authentication information of your filesystem.

Synopsis

juicefs auth <name> --token=<token> [--accesskey=<access_key>] [--secretkey=<secret_key>]
[--accesskey2=<access_key_2>] [--secretkey2=<secret_key_2>]

Options

ItemsDescription
<name>The name of your filesystem.
--token=<token>The JuiceFS token of your filesystem, you can find this token in the web console.
--accesskey=<access_key>The access key of your bucket, you can read our guide on how to get access key and secret from your service provider.
--secretkey=<secret_key>The secret key of your bucket, you can read our guide on how to get access key and secret from your service provider.
--accesskey2=<access_key_2>The access key of your secondary bucket.
--secretkey2=<secret_key_2>The secret key of your secondary bucket.

Notes

  1. The authentication information is stored in $HOME/.juicefs/<NAME>.conf.
  2. You will be prompted to enter the access key and secret if you didn\'t provide it through the --token, --accesskey and --secretkey options.
  3. If your object storage provider allows accessing without key pairs (e.g. IAM), you can leave blank when you are asked for access and secret keys, or you can simply pass an empty string to the --accesskey and --secretkey options.
  4. Enable the JuiceFS replication in the setting panel of the Web Console, and mount with the --accesskey2 and --secretkey2 options.

juicefs mount

Description

Mount a filesystem.

Synopsis

juicefs mount <name> <mountpoint> [-f] [-b] [-v]
[--log=<log_path>] [--http=ADDR]
[--external | --internal] [--max-uploads=<max_uploads>]
[--cache-dir=<cache_dir>] [--cache-size=<cache_size>]
[--writeback] [--metacache]
[--allow-other] [--allow-root] [--enable-xattr]
...

Options

ItemsDescription
<name>The name of your filesystem.
<mountpoint>The mountpoint of your filesystem.
-fRun in the foreground mode.
-bRun in the background mode.
--subdir=<subdir>mount a sub-directory
--ioretries=<number>(default: 30) number of retries for network failure
--http=ADDRThe bind address to serve files using HTTP, for example, localhost:8080.
--disallow-listDisallow list a directory in WebDAV
--log=<log_path>(default: /var/log/juicefs.log) The path of the log file.
-vRun verbosely.
--no-updateuse local config only

Object Storage Options

ItemsDescription
--externalPrefer to use the external entrypoint of the object storage service. This means the traffic of JuiceFS will go through the public network instead of the internal network.
--internalPrefer to use the internal entrypoint of the object storage service. This means the traffic of JuiceFS will go through the internal network instead of the public network. (Applicable to some object storages that separate internal and external network domain names, e.g. Aliyun OSS, UCloud UFile, etc.)
--max-uploads=<max_uploads>(default: 50) The maximum number of concurrent uploading connections.
--prefetch=<number>(default: 3) number of concurrent prefetching
--upload-limit=<upload_limit>(default: unlimited) The maximum bandwidth for upload (Mbps).
--delete-limit=<delete-limit>(default: unlimited) The maximum invoke rate for object delete (QPS).
--get-timeout=<get_timeout>The maximum time for getting a single object (seconds).
--put-timeout=<put_timeout>The maximum time for upload a single object (seconds).
--gccleanup unused chunks after mounting immediately
--drydo not delete chunks during GC
--flipflip the two replicated bucket (prefer secondary bucket)

Security Options

ItemsDescription
--rsa-key=RSAKEYPath to RSA private key (PEM). Passphrase will be asked or provided with JFS_RSA_PASSPHRASE environment variable.

Cache Options

ItemsDescription
--cache-dir=<cache_dir>(default: /var/jfsCache or $HOME/.juicefs/cache) The path of the cache. Separate multiple directories by :, add quotation mark if using wildcard match (*). e.g. --cache-dir '/data*/jfsCache:/mydata*/jfsCache'
--cache-size=<cache_size>(default: 1G) The maximum size of the cache. The default unit is MiB. Will be evenly distributed to each directory in multiple directories mode.
--free-space-ratio=<free_space_ratio>(default: 0.2) The minimum size of the cache directory (ratio).
--buffer-size=<buffer_size>(default: 300) The maximum memory size of read and write data buffer (MiB).
--cache-mode=<cache_mode>(default: 0600) Permission mode of cache files.
--cache-group=<cache_group>(default: no sharing) the name of group to join and provide remote cache
--no-sharing(default: false) do not share cached blocks to others
--writeback(default: false) data will be written to local disk first, and be uploaded to object storage asynchronously in the background.
--cache-partial-only(default: false) If only cache the blocks for small reads
--metacacheEnable metadata caching in local memory.
--metacacheto=<metacacheto>(default: 300) Expiration of the meta cache (seconds).
--max-cached-inodes=MAXCACHEDINODES(default: 5000000) the max number of cached inodes
--opencacheOpen a file based on cached metadata.
--attrcacheto=<attrcacheto>(default: 1) Duration for the attributes of file and directory cached in the kernel (seconds) .
--entrycacheto=<entrycacheto>(default: 1) Duration for the file entry cached in the kernel (seconds).
--direntrycacheto=<direntrycacheto>(default: 1) Duration for the directory entry cached in the kernel (seconds).

FUSE Options

ItemsDescription
--allow-otherAllow accesses from other users. This option is enabled by default when you are running as root user. You need to enable this feature explicitly otherwise.
--enable-xattrEnable extended attributes (xattr) support.
--enable-aclEnable POSIX ACL support.
--no-posix-lockDisable POSIX lock support.
--no-bsd-lockDisable BSD lock support.
-o FUSE_OPTSother FUSE options
-o writeback_cacheEnable kernel writeback cache for 3.15+ Linux kernel, boost the performance dramatically for random write and small write.

See how to mount a filesystem in the document Getting Started.

Experimental Options

ItemsDescription
--min-balance-diff=MINBALANCEDIFFWhen the inodes difference between the current zone and the zone with the least inodes exceeds this value, the metadata will be automatically balanced.
--min-dir-inodes=MINDIRINODESWhen the number of directories in the current path exceeds this value, the metadata is automatically balanced.
--max-space=MAXSPACElimit the total space in GiB (default: no limit)
--source-dir=SOURCEDIRUse JuiceFS as cache for a directory
--refresh-interval=REFRESHINTERVALchecking for update (seconds)

Deprecated Options

ζ³¨ζ„οΌšThe following are the options that have been deprecated by JuiceFS!

ItemsDescription
--asyncsee --writeback
--sslUse HTTPS to access object store (always enabled)
--dircachesee --metacache
-dsee -v
--cacheDir=CACHEDIRsee --cache-dir
--cacheSize=CACHESIZEsee --cache-size
--allow-rootallow root to access (use --allow-other instead)
--no-syncdo not sync the replicated object store
--batch=BATCHnumber of seconds to wait to combine multiple small files as single object

juicefs umount

Description

Umount a JuiceFS file system.

Synopsis

juicefs umount <mountpoint> [options]

Options

ItemsDescription
-f --forceUmount it forcibly.

juicefs info

Description

Show information about the file or directory stored in JuiceFS.

Synopsis

juicefs info <path> [-n | --plain]

Options

ItemsDescription
<path>The path to the file you are querying.
-n --plainShow sizes in bytes.

Examples

Show information of a directory.

# juicefs info /jfs/logs
/jfs/logs:
inodes: 4 # inode total
directories: 2 # directory total
files: 2 # file total
chunks: 44 # chunk total of all files
length: 2.91G # real size of all files
size: 2.91G # billable size, every file and directory is aligned to 4KB as minimum billable size

Show information of a file.

# juicefs info --plain /jfs/daily-log.tar
/jfs/daily-log.tar:
inode: 2955 # inode ID of the file
length: 3128903680 # real size of the file
size: 3128950784 # billable size, minimum is 4KB
chunks: 47 # chunk total and detail, maximum 64MB for each chunk
0: 58597 67108864 0 67108864 # location in the file, chunk ID, length of chunk, real start location, length
1: 58598 67108864 0 67108864
...
45: 58661 67108864 0 67108864
46: 58662 41895936 0 41895936

juicefs lsof

Description

List recently (within 10 minutes) opened files in JuiceFS.

Synopsis

juicefs lsof <path>

juicefs import

Description

Import files already existing in the object storage without reuploading.

Synopsis

juicefs import <uri> <dst> [-v] [--name=<name>] [--mode=<mode>]

Options

ItemsDescription
<uri>The URI of the file you are importing. It should be in the format of <bucket_name>[.<domain>][/<prefix>].
<dst>The destination of the imported file.
--name=<name>The name of the filesystem. This is required in systems other than Linux.
--mode=<mode>Mode (Unix permissions) of imported files.
-vRun verbosely.

Notes

  1. The imported file will be read-only. However, you can still modify other attributes -- e.g. filename, permissions -- of the files and directories.
  2. If you delete the imported file in JuiceFS, the data stored in your object storage will NOT be deleted.

juicefs rmr

Description

Remove all the files and subdirectories, similar to rm -rf, but much faster.

It will try to remove them using current uid/gid, ignore those that can\'t be removed, return the number of removed files/directories, the number of left ones. If trash is enabled, the removed files are removed into trash.

Synopsis

juicefs rmr <dir> [-h]

juicefs snapshot

Description

Manage JuiceFS snapshots. Snapshots are snapshots of your data at a certain time. It is a common technology used in data backup. JuiceFS will not create a copy of your data when you create a snapshot. It will only create a copy when there are some changes made to the original data (i.e. copy-on-write).

Synopsis

juicefs snapshot <src> <dst> [-f | --force] [-c | --copy]  # create a snapshot
juicefs snapshot -d <dst> [-f | --force] # delete a snapshot

Options

ItemsDescription
<src>The path to the file you are creating the snapshot from.
<dst>The locate where you want to store your snapshot.
-d --deleteRemove the snapshot.
-f --forceOverwrite existing snapshot, or remove the snapshot arbitrarily.
-c --copyUse current user\'s uid, gid and umask to create the snapshot. Otherwise it will use permission information of the file you are creating snapshot.

juicefs grep

Description

Parallelized file pattern searcher.

Synopsis

juicefs grep [PATTERN] PATH ... [options]

Options

ItemsDescription
[PATTERN]Support simple pattern and basic regular expression.
PATHSearch path and files.
-j JOBS --jobs=JOBSNumber of parallel jobs (default is number of CPU cores).
-e PATTERNS --regexp PATTERNSThis option is most useful when multiple -e options are used to specify multiple patterns, or when a pattern begins with a dash (-).
-E extended-regexpInterpret pattern as an extended regular expression.
-HAlways print filename headers with output lines.
-n --line-numberEach output line is preceded by its relative line number in the file, starting at line 1.
-i --ignore-casePerform case insensitive matching. By default, it is case sensitive.
-v --invert-matchSelected lines are those not matching any of the specified patterns.

juicefs profile

Description

Collect and analyze the file system\'s oplog (operation log).

Synopsis

juicefs profile [options]

Options

ItemsDescription
-x PATH --path=PATHThe path of log, default path is /jfs.
-f FILE --file=FILEThe filename of log, default filename is .ophistory. For the differences between log files please refer to The .oplog virtual file in the mount directory.
-g GROUP_BY --group-by=GROUP_BYGroup the output by a specific attribute (default by cmd), choose from [uid, pid, cmd].
-s SORT_BY --sort-by=SORT_BYSort the output by a specific column (default by total_time), choose from [group, number, avg_time, total_time].
-u FILTER_BY_UID --filter-by-uid=FILTER_BY_UIDFilter the output by one or multiple keywords on the UID column, please separate multi keywords by comma (,).
-p FILTER_BY_PID --filter-by-pid=FILTER_BY_PIDFilter the output by one or multiple keywords on the PID column, please separate multi keywords by comma (,).
-w WINDOW_SIZE --window-size=WINDOW_SIZEThe window size of collect oplog, accept float value, 60 seconds by default.
-i FLUSH_INTERVAL --flush-interval=FLUSH_INTERVALThe interval of flush output, accept float value, 2 seconds by default.

juicefs benchmark

Description

Run benchmark, including read/write/stat big/small files.

Synopsis

juicefs benchmark [options] path-to-test

Options

ItemsDescription
--dest=DEST(default: /jfs/benchmark) path to run benchmark
--block-size=BLOCK_SIZE(default: 1MiB) block size in MiB
--bigfile-file-size=BIGFILE_FILE_SIZE(default: 1024MiB) size of big file in MiB
--smallfile-file-size=SMALLFILE_FILE_SIZE(default: 0.1MiB) size of small file in MiB
--smallfile-count=SMALLFILE_COUNT(default: 100) number of small files

juicefs warmup

Description

Warm-up cache for the files

Synopsis

juicefs warmup [PATH] [options]

Options

ItemsDescription
-f LISTFILE, --listfile=LISTFILEfile containing a list of paths (one path per line)
-c CONCURRENT, --concurrent=CONCURRENT(default: 50) number of concurrent workers
-brun in background

juicefs version

Description

Show the JuiceFS version information.

Synopsis

juicefs version [options]

Options

ItemsDescription
-u --upgradeUpgrade the JuiceFS client to latest version.