CephFS Shell

CephFS Shell provides shell-like commands that directly interact with the Ceph File System.

This tool can be used in interactive mode as well as in non-interactive mode. In former mode, cephfs-shell opens a shell session and after the given command is finished, it prints the prompt string and waits indefinitely. When the shell session is finished, cephfs-shell quits with the return value of last executed command. In non-interactive mode, cephfs-shell issues a command and exits right after the command’s execution is complete with the command’s return value.

Behaviour of CephFS Shell can be tweaked using cephfs-shell.conf. Refer to CephFS Shell Configuration File for details.

Usage :

cephfs-shell [options] [command] cephfs-shell [options] – [command, command,…]

Options :
-c, --config FILE

Path to cephfs-shell.conf

-b, --batch FILE

Path to batch file.

-t, --test FILE

Path to transcript(s) in FILE for testing

Note

Latest version of the cmd2 module is required for running cephfs-shell. If CephFS is installed through source, execute cephfs-shell in the build directory. It can also be executed as following using virtualenv:

[build]$ python3 -m venv venv && source venv/bin/activate && pip3 install cmd2
[build]$ source vstart_environment.sh && source venv/bin/activate && python3 ../src/tools/cephfs/cephfs-shell

Commands

mkdir

Create the directory(ies), if they do not already exist.

Usage :

mkdir [-option] <directory>…

  • directory - name of the directory to be created.

Options :
-m MODE

Sets the access mode for the new directory.

-p, --parent

Create parent directories as necessary. When this option is specified, no error is reported if a directory already exists.

put

Copy a file/directory to Ceph File System from Local File System.

Usage :

put [options] <source_path> <target_path>

  • source_path - local file/directory path to be copied to cephfs.

    • if . copies all the file/directories in the local working directory.

    • if - Reads the input from stdin.

  • target_path - remote directory path where the files/directories are to be copied to.

    • if . files/directories are copied to the remote working directory.

Options :
-f, --force

Overwrites the destination if it already exists.

get

Copy a file from Ceph File System to Local File System.

Usage :

get [options] <source_path> <target_path>

  • source_path - remote file/directory path which is to be copied to local file system.

    • if . copies all the file/directories in the remote working directory.

  • target_path - local directory path where the files/directories are to be copied to.

    • if . files/directories are copied to the local working directory.

    • if - Writes output to stdout.

Options:
-f, --force

Overwrites the destination if it already exists.

ls

List all the files and directories in the current working directory.

Usage :

ls [option] [directory]…

  • directory - name of directory whose files/directories are to be listed.

    • By default current working directory’s files/directories are listed.

Options:
-l, --long

list with long format - show permissions

-r, --reverse

reverse sort

-H

human readable

-a, -all

ignore entries starting with .

-S

Sort by file_size

cat

Concatenate files and print on the standard output

Usage :

cat <file>….

  • file - name of the file

cd

Change current working directory.

Usage :

cd [directory]

  • directory - path/directory name. If no directory is mentioned it is changed to the root directory.

    • If ‘.’ moves to the parent directory of the current directory.

cwd

Get current working directory.

Usage :

cwd

quit/Ctrl + D

Close the shell.

chmod

Change the permissions of file/directory.

Usage :

chmod <mode> <file/directory>

mv

Moves files/Directory from source to destination.

Usage :

mv <source_path> <destination_path>

rmdir

Delete a directory(ies).

Usage :

rmdir <directory_name>…..

rm

Remove a file(es).

Usage :

rm <file_name/pattern>…

write

Create and Write a file.

Usage :

write <file_name> <Enter Data> Ctrl+D Exit.

lls

Lists all files and directories in the specified directory.Current local directory files and directories are listed if no path is mentioned

Usage:

lls <path>…..

lcd

Moves into the given local directory.

Usage :

lcd <path>

lpwd

Prints the absolute path of the current local directory.

Usage :

lpwd

umask

Set and get the file mode creation mask

Usage :

umask [mode]

alias

Define or display aliases

Usage:

alias [name] | [<name> <value>]

  • name - name of the alias being looked up, added, or replaced

  • value - what the alias will be resolved to (if adding or replacing) this can contain spaces and does not need to be quoted

run_pyscript

Runs a python script file inside the console

Usage:

run_pyscript <script_path> [script_arguments]

  • Console commands can be executed inside this script with cmd (“your command”) However, you cannot run nested “py” or “pyscript” commands from within this script. Paths or arguments that contain spaces must be enclosed in quotes

Note

This command is available as pyscript for cmd2 versions 0.9.13 or less.

py

Invoke python command, shell, or script

Usage :

py <command>: Executes a Python command. py: Enters interactive Python mode.

shortcuts

Lists shortcuts (aliases) available

Usage :

shortcuts

history

View, run, edit, and save previously entered commands.

Usage :

history [-h] [-r | -e | -s | -o FILE | -t TRANSCRIPT] [arg]

Options:
-h

show this help message and exit

-r

run selected history items

-e

edit and then run selected history items

-s

script format; no separation lines

-o FILE

output commands to a script file

-t TRANSCRIPT

output commands and results to a transcript file

unalias

Unsets aliases

Usage :

unalias [-a] name [name …]

  • name - name of the alias being unset

Options:
-a

remove all alias definitions

set

Sets a settable parameter or shows current settings of parameters.

Usage :

set [-h] [-a] [-l] [settable [settable …]]

  • Call without arguments for a list of settable parameters with their values.

Options :
-h

show this help message and exit

-a

display read-only settings as well

-l

describe function of parameter

edit

Edit a file in a text editor.

Usage:

edit [file_path]

  • file_path - path to a file to open in editor

run_script

Runs commands in script file that is encoded as either ASCII or UTF-8 text. Each command in the script should be separated by a newline.

Usage:

run_script <file_path>

  • file_path - a file path pointing to a script

Note

This command is available as load for cmd2 versions 0.9.13 or less.

shell

Execute a command as if at the OS prompt.

Usage:

shell <command> [arguments]

locate

Find an item in File System

Usage:

locate [options] <name>

Options :
-c

Count number of items found

-i

Ignore case

stat

Display file status.

Usage :

stat [-h] <file_name> [file_name …]

Options :
-h

Shows the help message

snap

Create or Delete Snapshot

Usage:

snap {create|delete} <snap_name> <dir_name>

  • snap_name - Snapshot name to be created or deleted

  • dir_name - directory under which snapshot should be created or deleted

setxattr

Set extended attribute for a file

Usage :

setxattr [-h] <path> <name> <value>

  • path - Path to the file

  • name - Extended attribute name to get or set

  • value - Extended attribute value to be set

Options:
-h, --help

Shows the help message

getxattr

Get extended attribute value for the name associated with the path

Usage :

getxattr [-h] <path> <name>

  • path - Path to the file

  • name - Extended attribute name to get or set

Options:
-h, --help

Shows the help message

listxattr

List extended attribute names associated with the path

Usage :

listxattr [-h] <path>

  • path - Path to the file

Options:
-h, --help

Shows the help message

df

Display amount of available disk space

Usage :

df [-h] [file [file …]]

  • file - name of the file

Options:
-h, --help

Shows the help message

du

Show disk usage of a directory

Usage :

du [-h] [-r] [paths [paths …]]

  • paths - name of the directory

Options:
-h, --help

Shows the help message

-r

Recursive Disk usage of all directories

quota

Quota management for a Directory

Usage :

quota [-h] [–max_bytes [MAX_BYTES]] [–max_files [MAX_FILES]] {get,set} path

  • {get,set} - quota operation type.

  • path - name of the directory.

Options :
-h, --help

Shows the help message

--max_bytes MAX_BYTES

Set max cumulative size of the data under this directory

--max_files MAX_FILES

Set total number of files under this directory tree

CephFS Shell Configuration File

By default, CephFS Shell looks for cephfs-shell.conf in the path provided by the environment variable CEPHFS_SHELL_CONF and then in user’s home directory (~/.cephfs-shell.conf).

Right now, CephFS Shell inherits all its options from its dependency cmd2. Therefore, these options might vary with the version of cmd2 installed on your system. Refer to cmd2 docs for a description of these options.

Following is a sample cephfs-shell.conf:

[cephfs-shell]
prompt = CephFS:~/>>>
continuation_prompt = >

quiet = False
timing = False
colors = True
debug = False

abbrev = False
autorun_on_edit = False
echo = False
editor = vim
feedback_to_output = False
locals_in_py = True

Exit Code

Following exit codes are returned by cephfs shell

Error Type

Exit Code

Miscellaneous

1

Keyboard Interrupt

2

Operation not permitted

3

Permission denied

4

No such file or directory

5

I/O error

6

No space left on device

7

File exists

8

No data available

9

Invalid argument

10

Operation not supported on transport endpoint

11

Range error

12

Operation would block

13

Directory not empty

14

Not a directory

15

Disk quota exceeded

16

Broken pipe

17

Cannot send after transport endpoint shutdown

18

Connection aborted

19

Connection refused

20

Connection reset

21

Interrupted function call

22