Messages in this thread | | | From | "Peter T. Breuer" <> | Subject | Re: Some questions about linux kernel. | Date | Mon, 13 Mar 2000 09:57:27 +0100 (MET) |
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"A month of sundays ago James Sutherland wrote:" > At the time, I suggested moving the grim-reaper code into a userspace > daemon, to allow much greater/easier configurability. I can think of a few
I believe this is the correct solution. It implies exactly _one_ privileged task, whose job is to decide the privileges of all the rest.
> For the time being, though, the simple "kill the most likely suspect" > patch should be a pretty good approximation.
Nope. It isn't. It's unacceptable in practice.
I run labs. The lab machines have to have defenses against _themselves_. First line defence: system daemons restarted by init if killed. Second line: daemons restarted by cron-based checks (cron has to be maintained from init) at regular intervals. Third line: software watchdog checking mem use and ready to pull machine to runlevel s and back up again if conditions not rectified.
Even so, I get reports every couple of days from machines that have obviously killed themselves. I just got one from a cron telling me it had restarted the software watchdog, for goodness' sake! (amongst others: rpc.nfsd and rpc.mountd seem to be favourites).
Peter
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