负载均衡器未将请求转发到第二个Tomcat实例

Question

我在我的机器上运行2个tomcat实例，两个tomcat的server.xml中都有以下条目：

Tomcat 1 ：：

<Connector port="8081" protocol="HTTP/1.1"
               connectionTimeout="20000"
               redirectPort="8444" />
    <!-- A "Connector" using the shared thread pool-->
    <!--
    <Connector executor="tomcatThreadPool"
               port="8080" protocol="HTTP/1.1"
               connectionTimeout="20000"
               redirectPort="8443" />
    -->
    <!-- Define a SSL HTTP/1.1 Connector on port 8443
         This connector uses the BIO implementation that requires the JSSE
         style configuration. When using the APR/native implementation, the
         OpenSSL style configuration is required as described in the APR/native
         documentation -->
    <!--
    <Connector port="8443" protocol="org.apache.coyote.http11.Http11Protocol"
               maxThrea="150" SSLEnabled="true" scheme="https" secure="true"
               clientAuth="false" sslProtocol="TLS" />
    -->

    <!-- Define an AJP 1.3 Connector on port 8009 -->
    <Connector port="8010" protocol="AJP/1.3" redirectPort="8444" />

Tomcat2：server.xml ::

<Connector port="8080" protocol="HTTP/1.1"
           connectionTimeout="20000"
           redirectPort="8443" />
<!-- A "Connector" using the shared thread pool-->
<!--
<Connector executor="tomcatThreadPool"
           port="8080" protocol="HTTP/1.1"
           connectionTimeout="20000"
           redirectPort="8443" />
-->
<!-- Define a SSL HTTP/1.1 Connector on port 8443
     This connector uses the BIO implementation that requires the JSSE
     style configuration. When using the APR/native implementation, the
     OpenSSL style configuration is required as described in the APR/native
     documentation -->
<!--
<Connector port="8443" protocol="org.apache.coyote.http11.Http11Protocol"
           maxThreads="150" SSLEnabled="true" scheme="https" secure="true"
           clientAuth="false" sslProtocol="TLS" />
-->

<!-- Define an AJP 1.3 Connector on port 8009 -->
<Connector port="8009" protocol="AJP/1.3" redirectPort="8443" />

两个tomcat实例正在并行运行。

现在，我终于在/etc/httpd/httpd.conf文件中引入了带有以下条目的负载均衡器

 #
    # Load mod_jk
    #
    LoadModule jk_module modules/mod_jk.so
    JkWorkersFile conf/workers.properties
    JkLogFile logs/mod_jk.log
    JkLogLevel info
    JkLogLevel debug
    JkLogLevel warn
    JkLogStampFormat "[%a %b %d %H:%M:%S %Y]"
    JkMount / loadbalancer
    JkMount /* loadbalancer

并使用worker.properties文件为：

worker.list=loadbalancer

worker.jvm1.port=8009
worker.jvm1.host=127.0.0.1
worker.jvm1.type=ajp13
worker.jvm1.lbfactor=1
worker.jvm1.max_packet_size=65536
#worker.jvm1.socket_timeout=60
#worker.jvm1.connection_pool_timeout=60

worker.jvm2.port=8010
worker.jvm2.host=127.0.0.1
worker.jvm2.type=ajp13
worker.jvm2.lbfactor=1
worker.jvm2.max_packet_size=65536
#worker.jvm2.socket_timeout=60
#worker.jvm2.connection_pool_timeout=60

worker.loadbalancer.type=lb
worker.loadbalancer.balance_workers=jvm1,jvm2
worker.loadbalancer.sticky_session=0

worker.jvm1.socket_keepalive=1
worker.jvm2.socket_keepalive=1
worker.loadbalancer.method=B

现在重新启动httpd服务，然后重新启动tomcat并执行测试，我发现负载均衡器仅将请求转发给tomcat1，而不转发给tomcat2。 我将请求速率提高到每秒1000个请求，但仍然没有转发到tomcat2。

在worker.properties中，我禁用了jvm1，然后重新启动了httpd和tomcat2。 我收到以下错误：：

    ==> error_log <==
    [Fri Jul 04 15:44:52 2014] [error] (111)Connection refused: proxy: HTTP: attempt to connect to 127.0.0.1:8080 (paisa-tomcat) failed
    [Fri Jul 04 15:44:52 2014] [error] ap_proxy_connect_backend disabling worker for (paisa-tomcat)

==> error_log <==
[Fri Jul 04 15:44:52 2014] [error] proxy: HTTP: disabled connection for (paisa-tomcat)

==> error_log <==
[Fri Jul 04 15:44:52 2014] [error] proxy: AJP: disabled connection for (paisa-tomcat)

Answer 1

我认为它的“ worker.loadbalancer.method = B”：

如果设置为B [usyness]，则平衡器将根据工作人员当前服务的请求数量，选择当前负载最低的工作人员。 该数字除以worker lbfactor，然后选择最低值（最忙）的worker。 如果您的请求需要很长时间才能处理，例如下载应用程序，则此方法特别有趣。

尝试将其设置为“ N”以进行轮询，即使用两个不同的浏览器进行测试。