apache反向代理实现负载均衡,编译mod_proxy模块

关于apache反向代理实现负载均衡,编译mod_proxy模块解决办法,利用和做集群，有好几种方式:
一：查看是否有mod_proxy模块功能

[root@localhost ~]# /usr/local/apache/bin/httpd -l
[root@localhost ~]# /usr/local/apache/bin/httpd -M

可以看到是否有mod_proxy的模块，直接去 /usr/local/apache/modules/ 去查看是否有对应的mod_proxy.so,mod_proxy_balancer.so,mod_proxy_http.so,mod_proxy_ajp.so的模块包
二：已经安装好的apache不过没有编译此模块要自己动手编译

[root@localhost ~]# cd /usr/local/src/httpd-2.2.31/modules/proxy
[root@localhost proxy]# /usr/local/apache/bin/apxs -c -i mod_proxy.c proxy_util.c
[root@localhost proxy]# /usr/local/apache/bin/apxs -c -i mod_proxy_balancer.c
[root@localhost proxy]# /usr/local/apache/bin/apxs -c -i mod_proxy_http.c

安装proxy_ajp模块

[root@localhost proxy]# /usr/local/apache/bin/apxs -c -i mod_proxy_ajp.c ajp_header.c ajp_utils.c ajp_msg.c ajp_link.c

可以去 /usr/local/apache/modules/ 看下生成了对应
mod_proxy.so,mod_proxy_balancer.so,mod_proxy_http.so,mod_proxy_ajp.so的包
三：配置httpd.conf,设置权重和session严格复制等

LoadModule proxy_module modules/mod_proxy.so
LoadModule proxy_balancer_module modules/mod_proxy_balancer.so
LoadModule proxy_http_module modules/mod_proxy_http.so

ProxyRequests Off
<Proxy balancer://clusterphpinfo>
BalancerMember http://192.168.1.101:8080 loadfactor=5
BalancerMember http://192.168.1.100:8080 loadfactor=1
ProxySet lbmethod=bytraffic
</Proxy>
ProxyPass /t2 balancer://clusterphpinfo stickysession=STICK_PORT_TOKEN nofailover=On
ProxyPassReverse /t2 balancer://clusterphpinfo

<Location /balancer-manager>
SetHandler balancer-manager
Order Deny,Allow
Allow from all
</Location>

配置说明：

1，平衡算法，由bys变成bytraffic
2，由平均分配变成非平均分配
另一个虚拟主机配置：

<VirtualHost *:80>
ServerName hs.i5a6.com
ServerAlias i5a6.com
DocumentRoot "/usr/local/apache/htdocs/hs"
ProxyPass /hs  ajp://127.0.0.1:8009/hs
ProxyPassReverse /hs ajp://127.0.0.1:8009/hs
</VirtualHost>

<Proxy balancer://mycluster>
BalancerMember http://127.0.0.1:8181/hs  loadfactor=40
BalancerMember http://127.0.0.1:8282/hs loadfactor=40
BalancerMemberhttp://127.0.0.1:8080/hs loadfactor=10
BalancerMember http://127.0.0.1:8081/hs loadfactor=10
#热备,如果8181服务挂掉,apache会自动把请求发送到8282,如果8181恢复服务,apache会把请求发送到8181
#BalancerMember http://127.0.0.1:8282 status=+H
</Proxy>
<VirtualHost *:80>
ServerName hs.i5a6.com
DocumentRoot "/usr/local/apache/htdocs/hs"
      #内部的请求 /hs/ 代理 balancer://mycluster/ 模块的请求
      #ProxyPass /hs/ balancer://mycluster/

   #stickysession session的性质,是否具有粘性
   #nofailover=On不支持会话复制
   #lbmethod 负载均衡的算法,lbmethod可能的取值有：
   #lbmethod=byrequests 按照请求次数均衡(默认)
   #lbmethod=bytraffic 按照流量均衡
   #lbmethod=bybusyness 按照繁忙程度均衡(总是分配给活跃请求数最少的服务器)
   #maxattempts=1 apache在放弃服务前,尝试的次数

   ProxyPass /hs/ balancer://mycluster/ stickysession=STICK_PORT_TOKEN nofailover=On lbmethod=byrequests maxattempts=1
   ProxyPassReverse /hs balancer://mycluster/

   #调整由反向代理服务器发送的HTTP应答头中的URL.
   #根据代理打开 balancer://mycluster/ 模块的a.html
   #如果点击a.html页面的内部链接(绝对路径另论),需要这个设置将路径修改为代理的路径.

</VirtualHost>

apache 反向代理出现内网ip解决方法

apache中设置如下反向代理后端的tomcat出现request.getServerName();获取到的主机名称就会是localhost，解决这个

<VirtualHost *:80>
    ServerAdmin [e-mail]
    DocumentRoot /usr/local/apache/htdocs
    ServerName i5a6.com
    ServerAlias *.i5a6.com
     DirectoryIndex index.html  index.html.var  index.jsp
     ProxyPass / http://localhost:8080/
     ProxyPassReverse / http://localhost:8080/
     ErrorLog "logs/hscode-error.log"
     CustomLog "logs/hscode-access.log" common
</VirtualHost>

在httpd.conf 文件中增加：ProxyPreserveHost On 即可,对应的 也有此问题解决之法：

proxy_set_header Host $host;
upstream mytomcat{
 server 127.0.0.1:8000 weight=10;
 server 127.0.0.1:8001 weight=20;
 server 127.0.0.1:8002 weight=30;
 server 127.0.0.1:8080 weight=40;
 }

server
{
listen 80;
server_name i5a6.com *.i5a6.com;
index index.html index.htm ;
root /usr/local/data/htdocs/www;

location / {
# proxy_set_header Host %host;
# proxy_set_header X-Forwarded-For $remote_addr;
 proxy_pass http://mytomcat;
proxy_set_header Host $host;
 }

另附：Linux apache单独编译mod_rewrite.so

1.寻找apache源码安装目录中的mod_rewrite.c文件
#find / -name mod_rewrite.c
/usr/httpd-2.2.22/modules/mappers/mod_rewrite.c

2.切换到mod_rewrite.c文件目录
#cd /usr/httpd-2.2.22/modules/mappers/

3.编译
#/usr/apache/Apache2.2/bin/apxs -c mod_rewrite.c 
#/usr/apache/Apache2.2/bin/apxs -i -a -n mod_rewrite mod_rewrite.la
在/usr/apache/Apache2.2/modules中会编译好mod_rewrite.so

4.如果是Apache2.2.22版本
LoadModule mod_rewrite_module modules/mod_rewrite.so 前面添加#注释符；

 1 . 如何让自己的本地APACHE服务器支持.htaccess
如何让自己的本地APACHE服务器支持".htaccess"呢?其实只要简单修改一下apache的httpd.conf设置就可以让APACHE支持.htaccess了,来看看操作

打开httpd.conf文件(在那里? APACHE目录的CONF目录里面),用文本编辑器打开后,查找
(1)
Options FollowSymLinks
AllowOverride None

改为
Options FollowSymLinks
AllowOverride All

(2)去掉下面的注释
LoadModule rewrite_module modules/mod_rewrite.so

就可以了