Cite man 7 hier
......
/usr/lib
Object libraries, including dynamic libraries, plus some executables which usually are not invoked directly. More complicated pro‐
grams may have whole subdirectories there.
......
i.e.
man systemd-sysctl
systemd-sysctl.service is an early-boot service that configures sysctl(8) kernel parameters.
See sysctl.d(5) for information about the configuration of this service.
man sysctl.d
NAME
sysctl.d - Configure kernel parameters at boot
SYNOPSIS
/etc/sysctl.d/*.conf
/run/sysctl.d/*.conf
/usr/lib/sysctl.d/*.conf
DESCRIPTION
At boot, systemd-sysctl.service(8) reads configuration files from the above directories to configure sysctl(8) kernel parameters.
# ll /etc/sysctl.conf
-rw-r--r--. 1 root root 225 Mar 26 14:55 /etc/sysctl.conf
# ll /etc/sysctl.d/
total 0
lrwxrwxrwx. 1 root root 14 Apr 3 09:17 99-sysctl.conf -> ../sysctl.conf
# cat /etc/sysctl.conf
# System default settings live in /usr/lib/sysctl.d/00-system.conf.
# To override those settings, enter new settings here, or in an /etc/sysctl.d/<name>.conf file
#
# For more information, see sysctl.conf(5) and sysctl.d(5).
[root@szigeti-6560b ~]# cat /usr/lib/sysctl.d/00-system.conf
...
# man -k sysctl|grep systemd
systemd-sysctl (8) - Configure kernel parameters at boot
systemd-sysctl.service (8) - Configure kernel parameters at boot
man systemd-sysctl.service
NAME
systemd-sysctl.service, systemd-sysctl - Configure kernel parameters at boot
SYNOPSIS
systemd-sysctl.service
/usr/lib/systemd/systemd-sysctl
DESCRIPTION
systemd-sysctl.service is an early-boot service that configures sysctl(8) kernel parameters.
See sysctl.d(5) for information about the configuration of this service.
SEE ALSO
systemd(1), sysctl.d(5), sysctl(8),
I think, the config files should store in /etc instead of everywhere else. The chroot applications are exceptions. It cause we MUST mount /usr in / (root) partion.
Balint
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