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Bug 51741 - Apache is unable to handle more than 1024 fd.
Apache is unable to handle more than 1024 fd.
Product: Red Hat Linux
Classification: Retired
Component: apache (Show other bugs)
All Linux
low Severity medium
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Assigned To: Joe Orton
David Lawrence
Depends On:
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Reported: 2001-08-14 12:32 EDT by Florian Brand
Modified: 2007-03-26 23:48 EDT (History)
0 users

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Last Closed: 2004-09-21 06:07:44 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Florian Brand 2001-08-14 12:32:48 EDT
Description of problem:
Apache is compiled with a FD_SIZE of 1024. If you have many virtual hosts (
510+) with seperate log files all filedescriptors are used for the log
files. ( ulimit -H -n 8000, so the kernel is not the problem)

Apache can request more fds from the kernel and for the logfiles it does
work. However for allocating the sockets Apache checks FD_SIZE and dies.

How reproducible:

Steps to Reproduce:
1. Create let4s say 100 virtual hosts with seperate log files.
2. try to start apache

Actual Results:  No open sockets, Apache dead.

Expected Results:  Apache available.

Additional info:

This problem occurs of course only for larger ISPs.
since ulimits protects the system perfectly IMHO the FD_SIZE limit can be
removed entirely 
or at least enlarged to a higher value, or set dynamicly acording to the
actual ulimit/max_files settings of the kernel
Comment 1 Florian Brand 2001-08-15 12:37:28 EDT
mmm, typo in the original bug form.
Actually it is FD_SETSIZE that is offending.
Comes from /usr/include/linux/posix_types.h __FD_SET_SIZE
Comment 2 Joe Orton 2004-09-21 06:07:44 EDT
Thanks for the report.  This bug is no longer present in the Apache
httpd 2.0 packages in Red Hat Enterprise Linux and Fedora Core.

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