We have an ec2 instance 4vcpu and 16gb of ram which is running Apache
server with mpm event behind an aws ELB (application load balancer). This
server serve just Images requested by our other applications although for
most of application we are uasing cloudfront for caching but one app is
directly sending request on server . Now Apache memory usage reached to
70% every day but it did not come down we have to restart server every
time. Earier will old Apache 2.2 version and worker mpm without load
balncer we were not having this issue. I have tried different configuration
for MPM EVENT and Apache but its not working. Here is apache2.conf
Timeout 120 # also tried the timeout with 300
KeepAlive On
MaxKeepAliveRequests 100
KeepAliveTimeout 45 # varies this setting from 1 seconds to 300
Here is load balancer setting
- Http and https listener
- Idle timeout is 30
Mpm event
<IfModule mpm_event_module>
StartServers 2
MinSpareThreads 50
MaxSpareThreads 75
ThreadLimit 64
#ServerLimit 400
ThreadsPerChild 25
MaxRequestWorkers 400
MaxConnectionsPerChild 10000
</IfModule>
1. When i change MaxRequestWorkers to 150 with MaxConnectionsPerChild 0
and ram usage reached 47 percent system health checks are failed and new
instance is launched by auto scaling group. Seems like worker limit is
reached which already happend when this instance was working with 8GB Ram.
2. Our other server which are just running with simple django site and
django rest frame apis are working fine with default values for MPM and
apache configured on installation.
3. I have also tried the configuration with KeepAliveTimeout equals to 2,
3 and 5 seconds as well but it did not work .
4. I have also follow this link [enter link description here][1] it worked
somewhat better but memory usage is not coming down.
here is the recent error log
[Fri Dec 04 07:45:21.963290 2020] [mpm_event:error] [pid 5232:tid
139782245895104] AH03490: scoreboard is full, not at
MaxRequestWorkers.Increase ServerLimit.
[Fri Dec 04 07:45:22.964362 2020] [mpm_event:error] [pid 5232:tid
139782245895104] AH03490: scoreboard is full, not at
MaxRequestWorkers.Increase ServerLimit.
[Fri Dec 04 07:45:23.965432 2020] [mpm_event:error] [pid 5232:tid
139782245895104] AH03490: scoreboard is full, not at
MaxRequestWorkers.Increase ServerLimit.
[Fri Dec 04 07:45:24.966485 2020] [mpm_event:error] [pid 5232:tid
139782245895104] AH03490: scoreboard is full, not at
MaxRequestWorkers.Increase ServerLimit.
[Fri Dec 04 07:45:25.967281 2020] [mpm_event:error] [pid 5232:tid
139782245895104] AH03490: scoreboard is full, not at
MaxRequestWorkers.Increase ServerLimit.
[Fri Dec 04 07:45:26.968328 2020] [mpm_event:error] [pid 5232:tid
139782245895104] AH03490: scoreboard is full, not at
MaxRequestWorkers.Increase ServerLimit.
[Fri Dec 04 07:45:27.969392 2020] [mpm_event:error] [pid 5232:tid
139782245895104] AH03490: scoreboard is full, not at
MaxRequestWorkers.Increase ServerLimit.
[Fri Dec 04 07:45:28.970449 2020] [mpm_event:error] [pid 5232:tid
139782245895104] AH03490: scoreboard is full, not at
MaxRequestWorkers.Increase ServerLimit.
[Fri Dec 04 07:45:29.971505 2020] [mpm_event:error] [pid 5232:tid
139782245895104] AH03490: scoreboard is full, not at
MaxRequestWorkers.Increase ServerLimit.
[Fri Dec 04 07:45:30.972548 2020] [mpm_event:error] [pid 5232:tid
139782245895104] AH03490: scoreboard is full, not at
MaxRequestWorkers.Increase ServerLimit.
[Fri Dec 04 07:45:31.973593 2020] [mpm_event:error] [pid 5232:tid
139782245895104] AH03490: scoreboard is full, not at
MaxRequestWorkers.Increase ServerLimit.
[Fri Dec 04 07:45:32.974644 2020] [mpm_event:error] [pid 5232:tid
139782245895104] AH03490: scoreboard is full, not at
MaxRequestWorkers.Increase ServerLimit.
[Fri Dec 04 07:45:33.975697 2020] [mpm_event:error] [pid 5232:tid
139782245895104] AH03490: scoreboard is full, not at
MaxRequestWorkers.Increase ServerLimit.
[Fri Dec 04 07:45:34.976753 2020] [mpm_event:error] [pid 5232:tid
139782245895104] AH03490: scoreboard is full, not at
MaxRequestWorkers.Increase ServerLimit.
[Fri Dec 04 07:45:35.977818 2020] [mpm_event:error] [pid 5232:tid
139782245895104] AH03490: scoreboard is full, not at
MaxRequestWorkers.Increase ServerLimit.
top command result
3296 www-data 20 0 3300484 469824 58268 S 0.0 2.9 0:46.46
apache2
2544 www-data 20 0 3359744 453868 58292 S 0.0 2.8 1:24.53
apache2
1708 www-data 20 0 3357172 453524 58208 S 0.0 2.8 1:02.85
apache2
569 www-data 20 0 3290880 444320 57644 S 0.0 2.8 0:37.53
apache2
3655 www-data 20 0 3346908 440596 58116 S 0.0 2.7 1:03.54
apache2
2369 www-data 20 0 3290136 428708 58236 S 0.0 2.7 0:35.74
apache2
3589 www-data 20 0 3291032 382260 58296 S 0.0 2.4 0:50.07
apache2
4298 www-data 20 0 3151764 372304 59160 S 0.0 2.3 0:18.95
apache2
4523 www-data 20 0 3140640 310656 58032 S 0.0 1.9 0:07.58
apache2
4623 www-data 20 0 3139988 242640 57332 S 3.0 1.5 0:03.51
apache2
What is wrong in the configuration that is causing high memory?
[1]:
https://aws.amazon.com/premiumsupport/knowledge-center/apache-backend-elb/
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