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I see that different users in my Debian system has different max open files limits. I read the post but would like to get some understanding of the details. I do not have any settings into /etc/security/limits.conf but:

mysql seems to follow kernel values:

Max open files            1024                 4096

redis has different values:

Max open files            4096                 4096

Does it raise it by default with setrlimit call?

root has another values:

Max open files            65536                65536

Are the special root values hardcoded somewhere or where should I seek for the settings?

origaminal
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1 Answers1

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Does it raise it by default with setrlimit call?

Probably. Applications may attempt to change their limits with that call.

On Linux, increasing above the hard limit requires CAP_SYS_RESOURCE privilege, see the man page. In practice, this means that running init scripts as root allows them to exceed this kind of resource limit.

John Mahowald
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