Tomcat 负载均衡配置

                     Tomcat 负载均衡配置

1.安装包：

apache-tomcat-5.5.25.tar.gz

httpd-2.2.3.tar.tar

 

2.安装：

[root@localhost build]# pwd
/usr/local/apache/build
[root@localhost build]# more config.nice
#! /bin/sh
#
# Created by configure

"./configure" \
"--prefix=/usr/local/apache" \
"--enable-mods-shared=all" \
"--enable-so" \
"--enable-proxy" \
"--enable-proxy_http=shared" \
"--enable-module=so" \
"--enable-mods-shared=all" \
"--enable-proxy-ajp=shared" \
"$@"

 

 

 

 

 

3.配置：

[root@localhost bin]# cat /usr/local/apache/conf/httpd.conf|grep httpd-vhosts.conf
Include conf/extra/httpd-vhosts.conf

 

 

 

[root@localhost extra]# cat　/usr/local/apache/conf/extra/httpd-vhosts.conf
#
# Virtual Hosts
#
# If you want to maintain multiple domains/hostnames on your
# machine you can setup VirtualHost containers for them. Most configurations
# use only name-based virtual hosts so the server doesn't need to worry about
# IP addresses. This is indicated by the asterisks in the directives below.
#
# Please see the documentation at
# <>
# for further details before you try to setup virtual hosts.
#
# You may use the command line option '-S' to verify your virtual host
# configuration.

#
# Use name-based virtual hosting.
#
NameVirtualHost 172.18.3.200:80

#
# VirtualHost example:
# Almost any Apache directive may go into a VirtualHost container.
# The first VirtualHost section is used for all requests that do not
# match a ServerName or ServerAlias in any block.
#
#
#    ServerAdmin
#    DocumentRoot /www/docs/dummy-host.example.com
#    ServerName dummy-host.example.com
#    ServerAlias
#    ErrorLog logs/dummy-host.example.com-error_log
#    CustomLog logs/dummy-host.example.com-access_log common
#

 

#ServerName 172.18.3.200

   
        Options FollowSymlinks
        Order allow,deny
        Allow from all
     
#DocumentRoot /usr/local/apache/htdocs/index.html

#    ServerAdmin
#    DocumentRoot /www/docs/dummy-host2.example.com
#    ServerName dummy-host2.example.com
#    ErrorLog logs/dummy-host2.example.com-error_log
#    CustomLog logs/dummy-host2.example.com-access_log common

ProxyPass / balancer://aaa/ stickysession=JSESSIONID lbmethod=byrequests maxattempts=1 nofailover=Off
ProxyPassReverse / balancer://aaa/
ProxyRequests Off

   BalancerMember ajp://172.18.3.200:8009 smax=2048 timeout=200 ttl=200 route=work1
   BalancerMember ajp://172.18.3.200:8010 smax=2048 timeout=200 ttl=200 route=work2

#ProxyPass / ajp://172.18.3.200:8009/ smax=1024 timeout=200 ttl=200

 

 

说明：本机器设置一个ip172.18.3.200.　tomcat 分别对应两个端口8009,8010

 

还需要更该的端口号有：　

1.

 

 

 

2.                 maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
               enableLookups="false" redirectPort="8443" acceptCount="100"
               connectionTimeout="20000" disableUploadTimeout="true" />

 

3.                enableLookups="false" redirectPort="8443" protocol="AJP/1.3" />

 

 

       

4.                     className="org.apache.catalina.cluster.mcast.McastService"
                mcastAddr="228.0.0.4"
                mcastPort="45564"
                mcastFrequency="500"
                mcastDropTime="3000"/>

                            className="org.apache.catalina.cluster.tcp.ReplicationListener"
                tcpListenAddress="172.18.3.200"
                tcpListenPort="4001"
                tcpSelectorTimeout="100"
                tcpThreadCount="6"/>

 

 

启动tomcat查看端口号（4001 8005 8009 8080）,另一台(4002,8006,8010,8088)

[root@localhost conf]# netstat -ant
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address               Foreign Address             State     
tcp        0      0 0.0.0.0:32769               0.0.0.0:*                   LISTEN     
tcp        0      0 0.0.0.0:111                 0.0.0.0:*                   LISTEN     
tcp        0      0 127.0.0.1:631               0.0.0.0:*                   LISTEN     
tcp        0      0 127.0.0.1:5335              0.0.0.0:*                   LISTEN     
tcp        0      0 127.0.0.1:25                0.0.0.0:*                   LISTEN     
tcp        0      0 ::ffff:172.18.3.200:4001    :::*                        LISTEN     
tcp        0      0 ::ffff:127.0.0.1:8005       :::*                        LISTEN     
tcp        0      0 :::8009                     :::*                        LISTEN     
tcp        0      0 :::80                       :::*                        LISTEN     
tcp        0      0 :::8080                     :::*                        LISTEN     
tcp        0      0 :::22                       :::*                        LISTEN     
tcp        0     36 ::ffff:172.18.3.200:22      ::ffff:172.18.3.194:3323    ESTABLISHED
tcp        0      0 ::1:35620                   ::1:32770                   TIME_WAIT

 

 

 

 

启动另一台tomcat出错

Tomcat启动出错     2008-04-07 18:42:05

LifecycleException: java.net.SocketException: No such device
    at org.apache.catalina.cluster.tcp.SimpleTcpCluster.start(SimpleTcpCluster.java:790)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1004)
    at org.apache.catalina.core.StandardHost.start(StandardHost.java:736)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1014)
    at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
    at org.apache.catalina.core.StandardService.start(StandardService.java:448)
    at org.apache.catalina.core.StandardServer.start(StandardServer.java:700)
    at org.apache.catalina.startup.Catalina.start(Catalina.java:552)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:585)
    at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:294)
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:432)

以上原因为：组播路由丢失.

 

route add -net 228.0.0.4 netmask 255.255.255.255 dev eth0

 

启动正常

 

验证方法，停掉其中一台tomcat，查看另一台的tomcat日志是否滚动．如果滚动代表session复制成功．

 

 

 

 

如下日志：

[root@localhost bin]# tail -f /opt/tomcat_1/logs/catalina.out
Apr 3, 2007 12:10:55 PM org.apache.catalina.cluster.tcp.SimpleTcpCluster memberDisappeared
INFO: Received member disappeared:org.apache.catalina.cluster.mcast.McastMember[tcp://172.18.3.200:4001,catalina,172.18.3.200,4001, alive=1573558]

 

 

补充：

tomcat集群和负载均衡的实现（session同步）补充

因为tomcat的session同步功能需要用到组播，windows默认情况下是开通组播服务的，但是linux默认情况下并没有开通，可以通过指令打开route add -net 224.0.0.0 netmask 240.0.0.0 dev eth0，如果需要服务器启动时即开通组播需在/etc/sysconfig/static-routes文件内加入eht0 net 224.0.0.0 netmask 240.0.0.0。具体组播概念请查阅CCNP相关内容。