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Frank Nocke
Asked: 2021-03-14 10:01:24 +0800 CST

Is there a command to show aggregate/merge results of all systemd conf.d drop-in files?

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I think I have basically understood how those systemd drop-in files work, like /etc/httpd/conf.d/ or /etc/sudoers.d/

My question: is there some helper command to show the current aggregate result?

i.e. seeing how everything plays together in the .d Folder and verifying i.e. that fooProperty is finally true not false…

systemd

1 Answers

  1. For service units you list all the properties with systemctl show or use option -p or --property to list just one. You can also use systemctl cat to concatenate all the various files, though without any merging of the information. Eg, for my http.service:

    $ systemctl cat httpd 
# /usr/lib/systemd/system/httpd.service     <--highlighted
....
[Unit]
Description=The Apache HTTP Server
...
[Service]
...
PrivateTmp=true
...

# /etc/systemd/system/httpd.service.d/override.conf  <--highlighted
[Service]
PrivateTmp=false
UMask=0002

    The above shows by a comment (highlighted in a terminal) the name of each of 2 files followed by its contents. You can see how the override.conf file provides a different value for PrivateTmp. You can see the resulting value with

    $ systemctl show  --property=PrivateTmp httpd
PrivateTmp=no

    However, this doesn't work with other units, like httpd.socket, which you can show as above, but which fails on a property in the files that I overrode:

    $ systemctl show  --property=ListenStream httpd.socket
Property ListenStream does not exist.

    I'm using version 231, things may have changed.

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