How to create custom options of my own in systemctl Linux? Post: 303036687

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Top Forums UNIX for Advanced & Expert Users How to create custom options of my own in systemctl Linux? Post 303036687 by Neo on Monday 8th of July 2019 06:42:03 AM

07-08-2019

Administrator

Ravinder,

If it was me, I would download the source code from github and search the source for these kinds of tokens, for example: start/stop/restart and try to find out where in the code these options are processed.

Then, you might find that it's not too difficult of a task to add a custom option to systemd by writing some code and recompiling your custom version of systemd. You might be able to link your new code in dynamically as a "ravinder" module.

The best way to do this, of course, is to fork the systemd code into your own github account, so you can track the changes and perhaps if your changes are interesting to others, they can download from your github page(s) as well. VSC has all the hooks you need to track all changes and manage all version control in the appropriate programming language (I assume C or C++, but have not checked).

I've not looked at the code, but I think it's a viable approach if you want to customize systemd, obviously you will need to modify the source, track changes, etc. and all the source is available.

It's just a matter of "doing it"... after doing your homework a bit more and deciding on where in the architecture to add your custom code.

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systemd-networkd.service

SYSTEMD-NETWORKD.SERVICE(8)				     systemd-networkd.service				       SYSTEMD-NETWORKD.SERVICE(8)

NAME

       systemd-networkd.service, systemd-networkd - Network manager

SYNOPSIS

       systemd-networkd.service

       /lib/systemd/systemd-networkd

DESCRIPTION

       systemd-networkd is a system service that manages networks. It detects and configures network devices as they appear, as well as creating
       virtual network devices.

       To configure low-level link settings independently of networks, see systemd.link(5).

       systemd-networkd will create network devices based on the configuration in systemd.netdev(5) files, respecting the [Match] sections in
       those files.

       systemd-networkd will manage network addresses and routes for any link for which it finds a .network file with an appropriate [Match]
       section, see systemd.network(5). For those links, it will flush existing network addresses and routes when bringing up the device. Any
       links not matched by one of the .network files will be ignored. It is also possible to explicitly tell systemd-networkd to ignore a link by
       using Unmanaged=yes option, see systemd.network(5).

       When systemd-networkd exits, it generally leaves existing network devices and configuration intact. This makes it possible to transition
       from the initrams and to restart the service without breaking connectivity. This also means that when configuration is updated and
       systemd-networkd is restarted, netdev interfaces for which configuration was removed will not be dropped, and may need to be cleaned up
       manually.

CONFIGURATION FILES

       The configuration files are read from the files located in the system network directory /lib/systemd/network, the volatile runtime network
       directory /run/systemd/network and the local administration network directory /etc/systemd/network.

       Networks are configured in .network files, see systemd.network(5), and virtual network devices are configured in .netdev files, see
       systemd.netdev(5).

SEE ALSO

       systemd(1), systemd.link(5), systemd.network(5), systemd.netdev(5), systemd-networkd-wait-online.service(8)

systemd 237													       SYSTEMD-NETWORKD.SERVICE(8)