Re: Getting "connection refused" Apache 2.4

[o haya <ohaya@xxxxxxxxxxxxxxxxxxxxx>]

Hi Daniel,

Unfortunately, the Apache I'm working with is part of a product, so I won't be able to change to a different MPM type.

I've been trying what you suggested (increasing MinSpareServers) but I still get tons of connections refused, even when I can confirm that, for example, I get 500+ httpd instances at startup (e.g., ps -ef shows 500 instances).  Is it possible that something else (e.g., the Redhat OS itself) is limiting the number of connections?

Thanks,

Jim

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From: Daniel <dferradal@xxxxxxxxx>
To: users@xxxxxxxxxxxxxxxx; o haya <ohaya@xxxxxxxxx>
Sent: Monday, November 16, 2015 3:07 PM
Subject: Re: Getting "connection refused" Apache 2.4

migrate to worker or event...

if you have to stick with prefork mpm, increase the number of MinSpareServers to a very high number, prefork is very slow spawning new children since it is not threaded, so better spawn most when apache starts.

El lun., 16 nov. 2015 a las 20:58, o haya (<ohaya@xxxxxxxxx.invalid>) escribió:

Hi,

I am trying to do some load testing of Apache 2.4 on Redhat.

Configuration displayed when I run "httpd -V" shows:

Server MPM: prefork
threaded: no
forked: yes (variable process count)

I am using Jmeter to test, and when I increase the number of simultaneous threads to > 200, I am seeing increasing number of errors, with a lot of "connection refused" errors, e.g.:

org.apache.http.conn.HttpHostConnectException: Connection to http://10.0.3.10:80 refused
        at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:190)
        at org.apache.http.impl.conn.ManagedClientConnectionImpl.open(ManagedClientConnectionImpl.java:294)
        at org.apache.jmeter.protocol.http.sampler.MeasuringConnectionManager$MeasuredConnection.open(MeasuringConnectionManager.java:107)
        at org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:643)
        at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:479)
        at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:906)
        at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:805)
        at org.apache.jmeter.protocol.http.sampler.HTTPHC4Impl.executeRequest(HTTPHC4Impl.java:517)
        at org.apache.jmeter.protocol.http.sampler.HTTPHC4Impl.sample(HTTPHC4Impl.java:331)
        at org.apache.jmeter.protocol.http.sampler.HTTPSamplerProxy.sample(HTTPSamplerProxy.java:74)
        at org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.sample(HTTPSamplerBase.java:1146)
        at org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.sample(HTTPSamplerBase.java:1135)
        at org.apache.jmeter.threads.JMeterThread.process_sampler(JMeterThread.java:434)
        at org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:261)
        at java.lang.Thread.run(Unknown Source)
Caused by: java.net.ConnectException: Connection timed out: connect
        at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)
        at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)
        at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
        at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
        at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
        at java.net.PlainSocketImpl.connect(Unknown Source)
        at java.net.SocksSocketImpl.connect(Unknown Source)
        at java.net.Socket.connect(Unknown Source)
        at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:127)
        at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:180)
        ... 14 more


I've been trying to re-configure the Apache to avoid these errors, e.g., increasing "MaxClients", and I've also increased the amount of memory for the machine (to 4GB) but so far, nothing I have done has improved the situation.

Is there something else that I can do to try to get the Apache so that it can accept the larger number of connections?

Thanks,
Jim



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