Nov 2 23:53:59 xxxxxx apachectl[70750]: AH00513: WARNING: MaxRequestWorkers of 400 is not an integer multiple of ThreadsPerChild of 250, decreasing to nearest multiple 250, for a maximum of 1 servers.
<IfModule mpm_event_module>ServerLimit 16StartServers 3MinSpareThreads 75MaxSpareThreads 250ThreadLimit 750 # 500ThreadsPerChild 250AsyncRequestWorkerFactor 2MaxRequestWorkers 1000 # 400MaxConnectionsPerChild 0</IfModule>
On 28/10/2022 10:42 am, Mike Dewhirst wrote:
On 27/10/2022 2:55 am, Frank Gingras wrote:
The defaults in the docs really cater to a low-traffic server; perhaps there should be a note to that effect.
On Wed, 26 Oct 2022 at 01:47, Mike Dewhirst <miked@xxxxxxxxxxxxxxx> wrote:
On 26/10/2022 12:45 pm, Frank Gingras wrote:
You could temporarily increase your ThreadsPerChild, as 25 is extremely low and increases the chances of that bug occurring.
Thanks Frank
These are the adjustments I made ...
ThreadLimit 500 #64
ThreadsPerChild 250 #25
This seems to have worked ...
Server uptime: 1 day 17 hours 23 minutes 47 seconds
Server uptime: 3 days 21 hours 57 minutes 33 seconds
Sadly I have to restart the machine for security updates so I'll have to start the count again. But it is looking good!
Many thanks Frank
:-)
Mike
The server is not heavily used other than by script-kiddies looking for php hacks. My next project is to find some way to black-hole anything with php or wp in the request. Maybe a redirect to google or something.
I'd have to find out what fix applies to this bug, and why your installation is still vulnerable. Perhaps your distro used backports.
I can't answer such questions.
But the defaults were very restrictive originally - set by DigitalOcean I suppose. I changed them to the defaults specified in the Apache docs - per the comment lines in my original post.
Thanks for responding so quickly.
Cheers
mike
On Tue, 25 Oct 2022 at 20:02, Mike Dewhirst <miked@xxxxxxxxxxxxxxx> wrote:
My Apache 2.4.52 is crashing with a bug apparently eliminated in 2.4.7.
Server Version: Apache/2.4.52 (Ubuntu 2022.04) OpenSSL/3.0.2
mod_wsgi/4.9.0 Python/3.10
Server MPM: event
Server Built: 2022-06-14T12:30:21
DigitalOcean droplet 8GB memory, dedicated CPU.
The log says ...
[Mon Oct 24 04:50:35.867241 2022] [mpm_event:error] [pid 904:tid
140622640994176] AH03490: scoreboard is full, not at
MaxRequestWorkers.Increase ServerLimit.
mpm-event.conf ...
# event MPM
# ServerLimit: Upper limit on configurable number of processes (default 16)
# StartServers: initial number of server processes to start (default 3)
# MinSpareThreads: minimum number of worker threads which are kept spare
(default 75)
# MaxSpareThreads: maximum number of worker threads which are kept spare
(default 250)
# ThreadLimit: upper limit on the configurable number of threads per
child process (default 64)
# ThreadsPerChild: constant number of worker threads in each server
process (default 25)
# MaxRequestWorkers: maximum number of worker threads
(ServerLimit*ThreadsPerChild)
# MaxConnectionsPerChild: maximum number of requests a server process serves
<IfModule mpm_event_module>
ServerLimit 16
StartServers 3
MinSpareThreads 75
MaxSpareThreads 250
ThreadLimit 64
ThreadsPerChild 25
AsyncRequestWorkerFactor 2
MaxRequestWorkers 400
MaxConnectionsPerChild 0
</IfModule>
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