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From Jayaram Ponnusamy <jayaram.ponnus...@gmail.com>
Subject [users@httpd] Help: Apache crashed once Concurrent Users reached 150
Date Thu, 05 Dec 2019 08:13:27 GMT
Hello,
We are using apache 2.2.21 on RHEL6.9 and in Backend we are using Tomcat
AppServer with JavaBased CMS.
Our Server Architecture is *(F5 [For Load Balance] -> Apache WebServer [For
Redirection & URL Mapping] -> Tomcat AppServer [Running a Java Based CMS]).*


We are using Apache to connect Tomcat by MOD_JK and mapping the URL
(Attached VirtualHost.conf), and No applications/code are running on
WebServers.

1. Two WebServers (4 CPU & 8GB RAM on Each Servers)
2. Two TomcatServers (8 CPU & 16GB RAM on Each Servers )

*PROBLEM:*
When the Child Process count is reached / crossed 200 like below then site
is not accessible when the child processes reached 300 or More than site
crashed and then we bring the site back by restarting Apache.
When the Child Processes reaching 200 during the time Google Analytics
shows the ACTIVE/CONCURRENT Users are 140-160. We have two Apache & Tomcat
Servers with Load-balancing but its unable to serve more than 150
concurrent users. Kindly please check my configuration and help to allow
at-least 500 concurrent users.

*CONFIGURATION:*
* httpd.conf*
<IfModule prefork.c>
StartServers         80
ServerLimit 3500
MaxClients 3500
MaxRequestsPerChild  0
</IfModule>

*Tomcat:*
<Connector port="9090" protocol="HTTP/1.1" redirectPort="8443"
URIEncoding="UTF-8" emptySessionPath="true" maxThreads="600"
minSpareThreads="10" connectionTimeout="-1" />
<Connector port="8009" protocol="AJP/1.3" redirectPort="8443"
URIEncoding="UTF-8" maxThreads="600" minSpareThreads="100"
connectionTimeout="20000" acceptCount="2000" />

*http_error.log:*
[Thu Dec 05 11:05:13 2019] [info] [client 0.0.0.0] (32)Broken pipe:
core_output_filter: writing data to the network
[Thu Dec 05 11:05:13 2019] [info] [client ::1] (32)Broken pipe:
core_output_filter: writing data to the network
[Thu Dec 05 11:06:47 2019] [error] [client 0.0.0.0] (70007)The timeout
specified has expired: proxy: error reading status line from remote server
stg.test.com
[Thu Dec 05 11:06:47 2019] [error] [client 0.0.0.0] proxy: Error reading
from remote server returned by /research
[Thu Dec 05 11:06:47 2019] [info] [client 0.0.0.0] (32)Broken pipe:
core_output_filter: writing data to the network
[Thu Dec 05 11:06:49 2019] [info] [client ::1] (32)Broken pipe:
core_output_filter: writing data to the network
[Thu Dec 05 11:07:02 2019] [info] [client 0.0.0.0] (32)Broken pipe:
core_output_filter: writing data to the network

*error_log*
[Wed Dec 04 14:24:24 2019] [info] server seems busy, (you may need to
increase StartServers, or Min/MaxSpareServers), spawning 32 children, there
are 0 idle, and 165 total children
[Wed Dec 04 14:24:25 2019] [info] server seems busy, (you may need to
increase StartServers, or Min/MaxSpareServers), spawning 32 children, there
are 0 idle, and 197 total children
[Wed Dec 04 14:24:26 2019] [info] server seems busy, (you may need to
increase StartServers, or Min/MaxSpareServers), spawning 32 children, there
are 0 idle, and 229 total children
[Wed Dec 04 14:24:27 2019] [info] server seems busy, (you may need to
increase StartServers, or Min/MaxSpareServers), spawning 32 children, there
are 0 idle, and 261 total children
[Wed Dec 04 14:24:28 2019] [info] server seems busy, (you may need to
increase StartServers, or Min/MaxSpareServers), spawning 32 children, there
are 0 idle, and 293 total children
[Wed Dec 04 14:24:40 2019] [info] server seems busy, (you may need to
increase StartServers, or Min/MaxSpareServers), spawning 8 children, there
are 0 idle, and 324 total children

-- 

*Thanks & Regards,*
*Jayaram Ponnusamy*

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