Config::Model::Systemd - Editor and validator for systemd configuration files


version 0.252.2


 # run on one service:
 $ sudo cme <cmd> systemd-service <name>  # run command on name.service
 $ sudo cme <cmd> systemd-socket <name>   # run command on name.socket
 $ sudo cme <cmd> systemd-timer <name>    # run command on name.timer

 # run on several user units:
 # Run on several units:
 $ sudo cme <cmd> systemd *         # run command on all units
 $ sudo cme <cmd> systemd <pattern> # run command on all units matching pattern
 $ sudo cme <cmd> systemd <pattern> # run command on all units matching pattern

 $ cme <cmd> systemd-user <pattern> # run command on all user units matching pattern

 # run on one service file (for unit development):
 $ sudo cme <cmd> systemd-service-file <file-name>
 $ sudo cme <cmd> systemd-socket-file <file-name>
 $ sudo cme <cmd> systemd-timer-file <file-name>


This module provides (with cme) a configuration editor for the configuration files of systemd, i.e. all files in ~/.config/systemd/user/ or all files in /etc/systemd/system/

Ok. I simplified. In more details, this module provides the configuration models of Systemd configuration file that cme, Config::Model and Config::Model::TkUI use to provide a configuration editor (cme edit) and checker (cme check).

invoke editor

The following command loads user systemd files (from ~/.config/systemd/user/ and launch a graphical editor:

 cme edit systemd-user foo

Likewise, the following command loads system systemd configuration files and launch a graphical editor to updated an override file (like systemctl edit command):

 sudo cme edit systemd foo

A developer can also edit a systemd file shipped with a software:

 cme edit systemd-service-file software-thing.service

Just check systemd configuration

You can also use cme to run sanity checks on systemd configuration files:

 cme check systemd-user '*'
 cme check systemd '*' # may take time
 cme check systemd-service foo
 cme check systemd-service-file software-thing.service

Use in Perl program (experimental)

As of Config::Model 2.086, a "cme(...)" in cme function is exported to modify configuration in a Perl program. For instance:

 use Config::Model qw/cme/; # also import cme function
 # call cme for systemd-user, modify ans save my-imap-tunnel.socket file.
   application => 'systemd-user',
   backend_arg => 'my-imap-tunnel'
 )->modify('socket:my-imap-tunnel Socket Accept=yes') ;

Similarly, system Systemd files can be modified using systemd application:

 use Config::Model qw/cme/;
   application => 'systemd',
   backend_arg => 'foo'
 )->modify(...) ;

For more details and parameters, please see cme, modify, load and save documentation.

Command line example

The examples below require App::Cme

Dump override content of a specific service:

 $ cme dump systemd-service transmission-daemon
 Reading unit 'service' 'transmission-daemon' from '/lib/systemd/system/transmission-daemon.service'.

Dump the whole service (like systemctl cat):

 $ cme dump systemd-service transmission-daemon --dumptype full
 Reading unit 'service' 'transmission-daemon' from '/lib/systemd/system/transmission-daemon.service'.
   CPUShares: 1024
   CPUWeight: 100
     - /bin/kill -s HUP $MAINPID
     - /usr/bin/transmission-daemon -f --log-error

Edit the service override with a GUI:

 $ cme edit systemd-service transmission-daemon.service

Edit the service override with a Shell UI:

 $ cme shell systemd-service transmission-daemon.service
  >:$ ls
 Service Unit Install
  >:$ cd Unit
  >: Unit $ ll -nz
 name      │ type │ value
 Conflicts │ list │
 Before    │ list │
 After     │ list │,
  >: Unit $ set After:.push(
  >: Unit $ ll -nz
 name      │ type │ value
 Conflicts │ list │
 Before    │ list │
 After     │ list │,,

Run command all user units:

 $ cme edit systemd-user '*'
 $ cme check systemd-user '*'

Run command all user units that match 'foo':

 $ cme edit systemd-user foo
 $ cme check systemd-user foo

Check all root units (can be quite long on small systems):

 # cme check systemd '*'

Check all root units that match 'foo':

 # cme check systemd foo

Edit override file of foo.service:

 # cme edit systemd foo.service

Run command on a service file:

 $ cme check systemd-service path/to/file.service
 $ cme edit systemd-service path/to/file.service

Timer and socket units are also supported:

 $ cme check systemd-socket path/to/file.socket
 $ cme check systemd-timer path/to/file.timer

Perl program (experimental)

 use Config::Model qw/cme/;
 cme(application => 'systemd-user' backend_arg => 'free-imap-tunnel')
    ->modify('socket:free-imap-tunnel Socket Accept=yes') ;

 cme(application => 'systemd-service', config_file => 'foo.service')
    ->modify('Unit Description="a service that does foo things"')


The list of supported parameters is extracted from the xml documentation provided by systemd project. This list is expected to be rather complete.

The properties of these parameters are inferred from the description of the parameters and are probably less accurate. In case of errors, please log a bug.


For now, only unit, socket and service files are supported. Please log a wishlist bug if you need other unit types to be supported.


In case of issue, please log a bug on


 Mohammad S Anwar

Thanks for your contributions



Dominique Dumont


This software is Copyright (c) 2008-2022 by Dominique Dumont.

This is free software, licensed under:

  The GNU Lesser General Public License, Version 2.1, February 1999



The following websites have more information about this module, and may be of help to you. As always, in addition to those websites please use your favorite search engine to discover more resources.

Bugs / Feature Requests

Please report any bugs or feature requests by email to ddumont at, or through the web interface at You will be automatically notified of any progress on the request by the system.

Source Code

The code is open to the world, and available for you to hack on. Please feel free to browse it and play with it, or whatever. If you want to contribute patches, please send me a diff or prod me to pull from your repository :)

  git clone git://