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Bug#931130: Document that local configuration for dummy and bonding modules are getting overwritten by systemd



Package: release-notes

Dear maintainers,

Systemd, in buster, will ship the file /lib/modprobe.d/systemd.conf,
which contains the following:

    options bonding max_bonds=0

    # Do the same for dummy0.

    options dummy numdummies=0

This breaks any configuration that an administrator could have added to
/etc/modprobe.d regarding the dummy and bonding modules.

For instance, a file in /etc/modprobe.d/dummy.conf containing:

    options dummy numdummies=1

Will result in the following being executed by modprobe:

    insmod /lib/modules/4.19.0-5-amd64/kernel/drivers/net/dummy.ko
numdummies=1 numdummies=0

And the original configuration will be overridden.

The only way to force modprobe to use local configuration is to rename
the /etc/modprobe.d/dummy.conf file to /etc/modprobe.d/systemd.conf.

I thinks this should be documented in the release notes as admins would
need to be aware of that.

Best,

-- 
Baptiste BEAUPLAT - lyknode

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