两台Web服务器 实现负载均衡 +FastCGI模块+MySQL实现分布式架构
操作系统:RedHat 5.8
实验环境准备 :三台服务器
Server 1 IP :172.16.2.1 安装:apache NFS
Server 2 IP :172.16.2.2 安装:apache DNS
Server 3 IP:172.16..2.3 安装:php mysql
实验图如下 :
工作原理:
1、当客户端请求
2、Server 2 上的DNS会以轮询的方式把请求转给 172.16.2.1 和172.16.2.2
3、如果此次请求是静态页面 web服务就直接把结果返给客户 ,如果是动态页面,就转给server 3 上的php 解析
4、如果需要用到数据库的数据,就通过数据库的接口访问数据库
5、Php解析后把结果返回给前端的web
6、Web把结果返回给客户
步骤
1、配置server 1
安装配置 apache 和 NFS
2、配置 server 2
安装配置apache 和DNS
3、配置 server 3
安装配置 mysql 和 php
4、总结
注:此次试验只是给大家提供一种思路,可以这么配置,企业实际需求中,不同的需求,不同的操作系统,不同的软件版本,配置过程会略有不同,但原理都是想通了,希望大家在做实验的同时不要忘了思考,学而不思则罔,原理理解了,我们就可以根据实际需求搭建出更适合自己需要的服务。
过程:
一、配置server 1 1.1 配置编译安装环境由于此次试验每个软件都是编译安装,所以每台服务器都要先配置好编译安装环境
确保这两个组安装
Development Tools Development Libraries #yum -y groupinstall "Development Libraries" 1.2 安装httpd 2.4.2 版本
#yum -y install pcre-devel 解决依赖关系 # tar xf httpd-2.4.2.tar.bz2 # cd httpd-2.4.2 # less INSTALL 查看安装说明 $ ./configure --prefix=PREFIX $ make $ make install $ PREFIX/bin/apachectl start # ./configure --prefix=/usr/local/apache --sysconfdir=/etc/httpd --enable-so --enable-rewrite --with-zlib --with-pcre --with-apr=/usr/local/apr --with-apr-util=/usr/local/apr-util --enable-modules=most --enable-ssl --enable-modules-shared=most #make && make install
1.3 修改httpd的主配置文件,设置其Pid文件的路径
#vim /etc/httpd/httpd.conf idFile "/var/run/httpd.pid" 添加
1.4 提供SysV服务脚本,内容如下:
#vim /etc/rc.d/init.d/httpd
#!/bin/bash # # httpd Startup script for the Apache HTTP Server # # chkconfig: - 85 15 # description: Apache is a World Wide Web server. It is used to serve \ # HTML files and CGI. # processname: httpd # config: /etc/httpd/conf/httpd.conf # config: /etc/sysconfig/httpd # pidfile: /var/run/httpd.pid # Source function library. . /etc/rc.d/init.d/functions if [ -f /etc/sysconfig/httpd ]; then . /etc/sysconfig/httpd fi # Start httpd in the C locale by default. HTTPD_LANG=${HTTPD_LANG-"C"} # This will prevent initlog from swallowing up a pass-phrase prompt if # mod_ssl needs a pass-phrase from the user. INITLOG_ARGS="" # Set HTTPD=/usr/sbin/httpd.worker in /etc/sysconfig/httpd to use a server # with the thread-based "worker" MPM; BE WARNED that some modules may not # work correctly with a thread-based MPM; notably PHP will refuse to start. # Path to the apachectl script, server binary, and short-form for messages. apachectl=/usr/local/apache/bin/apachectl httpd=${HTTPD-/usr/local/apache/bin/httpd} prog=httpd pidfile=${PIDFILE-/var/run/httpd.pid} lockfile=${LOCKFILE-/var/lock/subsys/httpd} RETVAL=0 start() { echo -n $"Starting $prog: " LANG=$HTTPD_LANG daemon --pidfile=${pidfile} $httpd $OPTIONS RETVAL=$? echo [ $RETVAL = 0 ] && touch ${lockfile} return $RETVAL } stop() { echo -n $"Stopping $prog: " killproc -p ${pidfile} -d 10 $httpd RETVAL=$? echo [ $RETVAL = 0 ] && rm -f ${lockfile} ${pidfile} } reload() { echo -n $"Reloading $prog: " if ! LANG=$HTTPD_LANG $httpd $OPTIONS -t >&/dev/null; then RETVAL=$? echo $"not reloading due to configuration syntax error" failure $"not reloading $httpd due to configuration syntax error" else killproc -p ${pidfile} $httpd -HUP RETVAL=$? fi echo } # See how we were called. case "$1" in start) start ;; stop) stop ;; status) status -p ${pidfile} $httpd RETVAL=$? ;; restart) stop start ;; condrestart) if [ -f ${pidfile} ] ; then stop start fi ;; reload) reload ;; graceful|help|configtest|fullstatus) $apachectl $@ RETVAL=$? ;; *) echo $"Usage: $prog {start|stop|restart|condrestart|reload|status|fullstatus|graceful|help|configtest}" exit 1 esac exit $RETVAL # chmod +x /etc/rc.d/init.d/httpd 为此脚本赋予执行权 # chkconfig --add httpd 加入服务列表:1.5 安装apache fastcgi模块: