Re: upgrade to fedora 9 bash fork: Resource temporarily unavailable

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On Mon, May 19, 2008 at 4:27 PM, Cameron Simpson <cs@xxxxxxxxxx> wrote:
> On 19May2008 10:36, mark <markkicks@xxxxxxxxx> wrote:
> | In /var/log/messages  this is the only weird message
> | May 19 10:32:16 XXX kernel: possible SYN flooding on port 80. Sending cookies.
> Are you running a web server? It may be forking like mad trying to
> service these requests...

Yes, I am running a web server nginx with 4 worker process. It is
serving only static files and like 70-100 requests/second. The CPU
load is really low.. I even rebooted the machine, load average is low

uptime
 18:03:34 up  7:44,  2 users,  load average: 0.26, 0.24, 0.24


> | have only 425 processes running
> | ps aux | wc -l
> | 425
> Does "ps axf" tell you anything useful/unusual? I find it more helpful
> than "aux" because it shows the parent/child tree.
no, there is nothing unusual!
ps axf | wc -l
426


> Hmm, another thought. See what ulimit says about your process limit;
> maybe F9 have some default limits that F8 did not.
I increased open files in F8 to 32768, that is preserved here in F9

How do I check my process limit? this is ulimit -a output

ulimit -a
core file size          (blocks, -c) 0
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 137216
max locked memory       (kbytes, -l) 32
max memory size         (kbytes, -m) unlimited
open files                      (-n) 32768
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
real-time priority              (-r) 0
stack size              (kbytes, -s) 10240
cpu time               (seconds, -t) unlimited
max user processes              (-u) 1024
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited

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