Hi all, On 6/26/19 9:23 PM, Justin B Rye wrote: > Baptiste BEAUPLAT wrote: >> 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. > > We need more information about why an administrator might have done > this, since otherwise for a start it's impossible to guess what would > go wrong as a result. VMs with sabotaged networking, or what? Is > there some other bugreport where we could read about these symptoms?
The dummy module can be used to create virtual interfaces, that can then be configured for a particular use. I've seen it a couple of times, usually for router or vpn box. It would allow to bind some services especially for that virtual interface. I stumble across this bug just as of today, while testing the upgrade to buster. I don't think there is yet other bug report on it. If you think that release-notes is not the place and that I should report it to another package, I don't mind at all reassigning it. > >> 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. > > This overrides the /lib/modprobe.d/systemd.conf entirely, doesn't it? > In which case you'd lose any other things in that file that systemd > might be depending on. Checking on a Buster box I see it also defines > "options bonding max_bonds=0" - if I want to avoid overriding that, > would it be better to use a name like /etc/modprobe.d/zz-local.conf? The current problem is the actual processing order of modprobe. It should be /lib/modprobe.d then /etc/modprobe.d. Currently, it merges both directories and then do the sorting. The 'ill' effect is that it processes /lib/modprobe.d/systemd.conf _after_ /etc/aa-systemd.conf, overwritting its content. I now realize that I should have reported the issue directly against modprobe. I don't think it will be fixed in time for buster release, so it might be still useful to have the info on the release notes. >> I thinks this should be documented in the release notes as admins would >> need to be aware of that. > > And/or quite possibly about max_bonds=0? I'm afraid I know even less > about what symptoms that might have. > I'll open a new bug against modprobe with a better explaining of the problem. I'll wait for maintainers' reply and see then. Thanks for your quick replies, Best, -- Baptiste BEAUPLAT - lyknode
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