centos7下apache2.4反向代理

apache安裝目錄在/data/apache24，這里就不介紹apache的安裝了。

一、反向代理配置

在/data/apache24/conf/extra下創建htttpd-proxy.conf文件

#開啟反代理的必須模塊
LoadModule proxy_module modules/mod_proxy.so
LoadModule proxy_connect_module modules/mod_proxy_connect.so
LoadModule proxy_http_module modules/mod_proxy_http.so
LoadModule proxy_balancer_module modules/mod_proxy_balancer.so
LoadModule slotmem_shm_module modules/mod_slotmem_shm.so
LoadModule lbmethod_byrequests_module modules/mod_lbmethod_byrequests.so
LoadModule lbmethod_bytraffic_module modules/mod_lbmethod_bytraffic.so
LoadModule lbmethod_bybusyness_module modules/mod_lbmethod_bybusyness.so

#關閉正向代理
ProxyRequests Off
#設置集群組，mycluster名稱可以隨意取
<Proxy "balancer://mycluster">
    BalancerMember http://192.168.1.222:8080
    BalancerMember http://192.168.1.233:8080
</Proxy>
#使用集群組，mycluster名稱需與上面配置相同
ProxyPass "/demo" "balancer://mycluster/"
ProxyPassReverse "/demo" "balancer://mycluster/"

修改/data/apache24/conf/httpd.conf中添加

Include conf/extra/htttpd-proxy.conf

這樣重啟apache后，當我們訪問網站/demo時，會反向代理到222和233上的8080端口。

 

二、apache負載均衡管理界面

<Location "/balancer-manager">
    SetHandler balancer-manager
    order Deny,Allow
    Deny from all
    Allow from localhost
</Location>

訪問網站/balancer-manager時，就可以看到apache自帶的一個負載均衡管理界面。

 

三、虛擬主機上配置反向代理

<VirtualHost *:80>
    DocumentRoot "/data/wwwroot/test"
    ServerName www.test.com
    ErrorLog "logs/www.test.com-error_log"
    CustomLog "logs/www.test.com-access_log" common
    #當我們訪問www.test.com時，都會代理到mycluster集群中。
    ProxyPass "/" "balancer://mycluster/"
    ProxyPassReverse "/" "balancer://mycluster/"
</VirtualHost>

 

四、負載比例分配

loadfactor取值范圍為1-100

ProxyRequests Off
<Proxy "balancer://mycluster">
    BalancerMember http://192.168.1.222:8080 loadfactor=6
    BalancerMember http://192.168.1.233:8080 loadfactor=4
    BalancerMember http://192.168.1.244:8080 loadfactor=2
</Proxy>
ProxyPass "/" "balancer://mycluster/"
ProxyPassReverse "/" "balancer://mycluster/"

　　

五、負載分配算法

lbmethod取值有：
lbmethod=byrequests 按照請求次數均衡(默認)
lbmethod=bytraffic 按照流量均衡
lbmethod=bybusyness 按照繁忙程度均衡(總是分配給活躍請求數最少的服務器)

ProxyRequests Off
<Proxy "balancer://mycluster">
    BalancerMember http://192.168.1.222:8080 loadfactor=6
    BalancerMember http://192.168.1.233:8080 loadfactor=4
    BalancerMember http://192.168.1.244:8080 loadfactor=2
</Proxy>
ProxyPass "/" "balancer://mycluster/"
ProxyPassReverse "/" "balancer://mycluster/"
ProxySet lbmethod=bytraffic

 

五、熱備份

請求總是流向222，一旦222掛掉， apache會檢測到錯誤並把請求分流給233。apache會每隔幾分鍾檢測一下222的狀況，如果222恢復，就繼續使用222。

ProxyRequests Off
<Proxy balancer://mycluster>
    BalancerMember http://192.168.1.222:8080
    BalancerMember http://192.168.1.233:8080 status=+H
</Proxy>
ProxyPass "/" "balancer://mycluster/"
ProxyPassReverse "/" "balancer://mycluster/"