Datalink manual

Datalink File Manager

Datalink File Manager (dlfs) component. Also known as the datalinker. A process, external to PostgreSQL, which manages file permissions, backup, restore, replacement and deletion of files.

It consists of two parts:

• dlfs command for system administrators to configure and monitor the file manager
• pg_datalinker daemon, which is an actual file manager program which runs in the background

dlfs

PostgreSQL datalink file manager control program

# dlfs 

    show                 - show version and system configuration
    bind [dbname] [port] - bind file manager to a database
    unbind               - unbind file manager from a database

    list                 - list all registered file systems (directories)
    add <directory>      - register a file system (directory)
    del <directory>      - unregister a file system (directory)

    dirs                 - show directories
    usage                - show directory usage

    start                - starts the file manager
    stop                 - stop the file manager
    restart              - restart file manager
    status               - show file manager status
    ps                   - show the file manager processes running on the system
    log                  - monitor file manager log

Show version and system configuration

# dlfs show
           server_version           | datname  | user | port | cluster_name 
------------------------------------+----------+------+------+--------------
 15.10 (Ubuntu 15.10-1.pgdg24.04+1) | postgres | root | 5432 | 15/main
(1 row)

 extname  | extowner | extversion | columns | files | dirs 
----------+----------+------------+---------+-------+------
 datalink | root     | 0.24       |       3 |     0 |    7
(1 row)

 pid  | cpid |  version  |         start         |         modify          | links | unlinks | errs 
------+------+-----------+-----------------------+-------------------------+-------+---------+------
 3215 | 3213 | 0.24.1012 | 1 day 08:55:11.893332 | 40 days 19:50:36.246282 |     3 |       4 |    0
(1 row)

Datalink manual