Linux下配置tomcat负载均衡
1.1 配置负载均衡
1.1.1 安装tomcat-connectors-1.2.25-src.tar.gz
步骤1： 将文件复制到/usr/local
cp tomcat-connectors-1.2.25-src.tar.gz /usr/local
步骤2： 解压
Cd /usr/local
tar xzvf tomcat-connectors-1.2.25-src.tar.gz
步骤3： 修改buildconf.sh的权限
cd /usr/local/tomcat-connectors-1.2.25-src/native
chmod 755 buildconf.sh
./buildconf.sh
步骤4：
./configure - -with-apxs=/usr/local/apache/bin/apxs
步骤5：
make
步骤6：
make install
步骤7： 将mod_jk.so复制到/usr/local/apache/modules/
cd /usr/local/tomcat-connectors-1.2.25-src/native/apache-2.0
cp mod_jk.so /usr/local/apache/modules/
1.1.2 系统整合
步骤1： 在/usr/local/apache/conf/httpd.conf加上如下语句
# Load mod_jk
LoadModule jk_module /usr/local/apache/modules/mod_jk.so
# Configure mod_jk
JkWorkersFile /usr/local/apache/conf/workers.properties
JkLogFile /usr/local/apache/logs/mod_jk.log
JkLogLevel info
JkMount /*.jsp loadbalancer
JkMount /servlet/* loadbalancer
JkMount /application/* loadbalancer
步骤2： 在/usr/local/apache/conf/目录下添加workers.properties
# list the workers by name
worker.list=tomcat1, tomcat2, loadbalancer
# ------------------------
# First tomcat server
# ------------------------
worker.tomcat1.port=8009
worker.tomcat1.host=127.0.0.1
worker.tomcat1.type=ajp13
# Specify the size of the open connection cache.
#worker.tomcat1.cachesize
#
# Specifies the load balance factor when used with
# a load balancing worker.
# Note:
# ----> lbfactor must be > 0
# ----> Low lbfactor means less work done by the worker.
worker.tomcat1.lbfactor=100
# ------------------------
# Second tomcat server
# ------------------------
worker.tomcat2.port=8009
worker.tomcat2.host=192.168.228.138
worker.tomcat2.type=ajp13
# Specify the size of the open connection cache.
#worker.tomcat2.cachesize
#
# Specifies the load balance factor when used with
# a load balancing worker.
# Note:
# ----> lbfactor must be > 0
# ----> Low lbfactor means less work done by the worker.
worker.tomcat2.lbfactor=100
# ------------------------
# Load Balancer worker
# ------------------------
# The loadbalancer (type lb) worker performs weighted round-robin
# load balancing with sticky sessions.
# Note:
# ----> If a worker dies, the load balancer will check its state
# once in a while. Until then all work is redirected to peer
# worker.
worker.loadbalancer.type=lb
worker.loadbalancer.balanced_workers=tomcat1, tomcat2
#
# END workers.properties
#
步骤3： 修改tomcat1的server.xml文件
<Connector port="8009" protocolHandlerClassName= "org.apache.jk. server. JkCoyoteHandler " redirectPort="8443" protocol="AJP/1.3" />
在120行左右加入如下语句
<Engine name="Standalone" defaultHost="localhost" jvmRoute="tomcat1"/>
步骤4： 修改tomcat2的server.xml文件
<Connector port="8009" protocolHandlerClassName= "org.apache.jk. server. JkCoyoteHandler " redirectPort="8443" protocol="AJP/1.3" />
在120行左右加入如下语句
<Engine name="Standalone" defaultHost="localhost" jvmRoute="tomcat2"/>
步骤5： 重新启动apache和tomcat
步骤6： 在tomcat1和tomcat2相同的目录的相同的文件中，写入不同的测试代码，通过启停tomcat，利用浏览器来判断是否安装成功。
在tomcat1中放一个jsp测试文件，内容为<%out.println(“tomcat1”)%>；
在tomcat2中放一个jsp测试文件，内容为<%out.println(“tomcat2”)%>；
如果tomcat1和tomcat2均启动，输入URL，页面有显示；
如果tomcat1启动，tomcat2关闭，输入URL，页面显示“tomcat1”；
如果tomcat1关闭，tomcat2启动，输入URL，页面显示“tomcat2”；
如果tomcat1和tomcat2均关闭，输入URL，页面会提示错误信息；
如果以上四种情况出现，那么负载均衡配置成功。