Bug#750739: apache2-mpm-worker: Can't start with >= 5000 VirtualHosts with 'SSLEngine On' - "AH00016: Configuration Failed". sysctl fs.file-max=512000
On Monday 16 June 2014 14:20:27, INTEN - Damian S. Kołodziejczyk
> error log shows only "AH00016: Configuration Failed"
If you have separate error logs for ssl virtualhosts, please also
check those for additional error messages.
> i increased max openfiles (sysctl fs.file-max=512000) becouse
> i also increased FD_SETSIZE in httpd.
Did you do this to try to fix this issue or was this an unrelated
change to fix something else? httpd should not use FD_SETSIZE
internally (though some library used by httpd may).
> Normal virtualhosts = 40 000 and working,
> SSL virtualhosts < 5000 and "AH00016: Configuration Failed"
You could try to start it under "strace -f" and try to see if there is
some system call that fails shortly before this message is printed.
BTW, you original report said "version 2.2.22-13+deb7u1", but the
AH00016 tag was only introduced in 2.4. Which version do you use