**实验环境**
CentOS 7
haproxy（nginx）：172.16.61.4（node4）
httpd+tomcat：172.16.61.7（node7）
172.16.61.8（node8）
一、使用nginx做负载均衡
**配置tomcat以及httpd**
<Engine name="Catalina" defaultHost="localhost" jvmRoute="Tomcat8"> #在node8节点添加jvmRoute标记，便于直观查看负载均衡效果（node7节点为Tomcat7）
<Host name="node8.tz.com" appBase="/data/webapps" #在两台tomcat上配置同样的虚拟主机
unpackWARs="true" autoDeploy="true">
[root@node8 conf.d]# cat proxy.conf #httpd配置（两台tomcat要相同）
<VirtualHost *:80>
ServerName tc1.tz.com
ProxyRequests Off
ProxyVia On
ProxyPreserveHost On
<Proxy *>
Require all granted
</Proxy>
ProxyPass / ajp://localhost:8009/
ProxyPassReverse / ajp:://localhost:8009/
<Location />
Require all granted
</Location>
</VirtualHost>
[root@node7 ROOT]# cat index.jsp #在tomcat的虚拟主机中定义主页内容
<%@ page language="java" %>
<html>
<head><title>Tomcat7</title></head>
<body>
<h1><font color="red">node8.tz.com</font></h1>
<table align="centre" border="1">
<tr>
<td>Session ID</td>
<% session.setAttribute("magedu.com","magedu.com"); %>
<td><%= session.getId() %></td>
</tr>
<tr>
<td>Created on</td>
<td><%= session.getCreationTime() %></td>
</tr>
</table>
</body>
</html>**配置nginx**
upstream tcsrvs { #在nginx配置文件中定义upsteam模块，默认采用轮询的调度算法
server node8:80; #基于主机名调度，本地hosts文件要解析后端hostname
server node7:80;
}
location / { #在server中定义location进行反向代理
proxy_set_header Host $http_host; #将客户端请求的host代理至后端
proxy_pass http://tcsrvs/;
}配置本地hosts文件，解析172.16.61.4 node8.tz.com地址
实现了轮询的效果
**haproxy负载均衡tomcat**
[root@node4 haproxy]# sed ‘s@^#.*\+\|^[[:space:]]\+#.*\+@@‘ haproxy.cfg global log 127.0.0.1 local2 chroot /var/lib/haproxy pidfile /var/run/haproxy.pid maxconn 4000 user haproxy group haproxy daemon stats socket /var/lib/haproxy/stats defaults mode http log global option httplog option dontlognull option http-server-close option forwardfor except 127.0.0.0/8 option redispatch retries 3 timeout http-request 10s timeout queue 1m timeout connect 10s timeout client 1m timeout server 1m timeout http-keep-alive 10s timeout check 10s maxconn 3000 frontend main *:80 default_backend tomcat listen statistics bind *:9090 stats enable stats hide-version stats uri /haproxyadmin?stats stats realm "HAproxy\ Statistics" stats auth admin:tianzhuang stats admin if TRUE backend tomcat balance roundrobin server tomcat1 172.16.61.7:80 check server tomcat2 172.16.61.8:80 check
**httpd负载均衡配置**
<proxy balancer://tccluster> BalancerMember http://172.16.61.7:80 loadfactor=1 BalancerMember http://172.16.61.8:80 loadfactor=1 ProxySet lbmethod=bytraffic </proxy> <VirtualHost *:80> ServerName localhost ProxyRequests Off ProxyVia On ProxyPass / balancer://tccluster/ ProxyPassReverse / balancer://tccluster/ ProxyPreserveHost On <Proxy *> Require all granted </Proxy> <Location /> Require all granted </Location> </VirtualHost>
**保持session会话**
nginx负载均衡session保持问题：
upstream tcsrvs {
server node8:80;
server node7:80;
ip_hash; #基于客户端地址进行hash，将来自同一ip的请求发至同一个server
# hash $request_uri; #基于请求的uri hash，应用于后端的缓存server；
# hash $remote_addr; #基于远程客户端地址hash，相当于ip_hash;
}haproxy负载均衡session保持问题：
backend tomcat balance roundrobin cookie TOMCAT insert nocache #在后端主机的响应报文中插入cookie server tomcat1 172.16.61.7:80 check cookie tomcat1 server tomcat2 172.16.61.8:80 check cookie tomcat2
httpd负载均衡session保持问题：
[root@node4 conf.d]# cat proxy.conf
Header add Set-Cookie "ROUTEID=.%{BALANCER_WORKER_ROUTE}e; path=/" env=BALANCER_ROUTE_CHANGED #增加头部的session信息，以route为关键字
<proxy balancer://tccluster>
BalancerMember http://172.16.61.7:80 loadfactor=1 route=Tomcat7 #route为Tomcat7，后端tomcat server也需要加入该route信息
BalancerMember http://172.16.61.8:80 loadfactor=1 route=Tomcat8
ProxySet lbmethod=bytraffic
ProxySet stickysession=ROUTEID
</proxy>
<VirtualHost *:80>
ServerName localhost
ProxyRequests Off
ProxyVia On
ProxyPass / balancer://tccluster/
ProxyPassReverse / balancer://tccluster/
ProxyPreserveHost On
<Proxy *>
Require all granted
</Proxy>
<Location />
Require all granted
</Location>
</VirtualHost>haproxy、nginx以及httpd负载均衡tomcat主机，seesion保持问题
原文：http://tz666.blog.51cto.com/10990100/1749967