[Bug 634736] sysctl.conf / sysctl.conf.d settings not read when modules are loaded

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=634736

Adam Williamson (Red Hat)  changed:

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--- Comment #19 from Adam Williamson (Red Hat)  ---
sysctl.d manpage notes:

"Many sysctl parameters only become available when certain kernel modules are
loaded. Modules are usually loaded on demand, e.g. when certain hardware is
plugged in or network brought up. This means that systemd-sysctl.service(8)
which runs during early boot will not configure such parameters if they become
available after it has run. To set such parameters, it is recommended to add an
udev(7) rule to set those parameters when they become available."

The example udev rule given for bridging is:

/etc/udev/rules.d/99-bridge.conf:

ACTION=="add", SUBSYSTEM=="module", KERNEL=="bridge",
RUN+="/usr/lib/systemd/systemd-sysctl --prefix=/proc/sys/net/bridge"

so...possibly we should be shipping such a udev rule ourselves. Let's bring in
the systemd folks, why not, everyone else is at the party already...