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Is there a way to set a limit on the RAM usage (virtual and resident) that a daemon can be granted in Debian? I understand that ulimit doesn't apply here, but something the right settings in /etc/security/limits.conf may be the answer.

I'm preferably looking for a concrete example. Say (whether this is actually a bad idea or not), limit virtual to 30MB and resident to 10MB for BIND. This setting should be enforced on the RAM used by all processes spawened by that daemon.

Thanks!

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2 Answers 2

up vote 1 down vote accepted

You can limit the maximum memory used by a program, but if the program want more memory, most of them just abort/crash/whatever.

So you have to configure bind to limit its memory usage.
The main option is max-cache-size (look at bind's configuration file, generaly into /etc/bind/named.conf). For example max-cache-size 10M
Don't use datasize if you don't really know what you do.

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You wouldn't want to. Virtual memory isn't a scarce resource, so limiting it makes no sense. And limiting a program's resident memory just slows the whole system to a crawl because it makes it need more I/O.

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