LAMP（扩展）解决单台服务器上限

首先说下试验需求

目前有单台的LAMP，但是网站需求量增大单台已经无法满足需求了，所以我们需要在增加一台服务器来提高网站需求量：

试验拓扑图如下：

注：应为没有公网解析，所以就将DNS服务器做在了新增机器上，这里使用的是两台RHEL5.8的虚拟机，本机IP是192.168.80.1

实施步骤：
配置yum,安装好编译环境，selinux关闭

1、配置DNS解析：
1）首先卸载本机的DNS，这里安装bind97的

# yum -y remove bind-utils bind-libs

# yum -y install bind97 bind97-utils bind97-libs
# vim /etc/named.conf
……
options {
        listen-on port 53 { any; };
        directory       "/var/named";
        dump-file       "/var/named/data/cache_dump.db";
        statistics-file "/var/named/data/named_stats.txt";
        memstatistics-file "/var/named/data/named_mem_stats.txt";
        allow-query     { any; };
        recursion yes;
};
……

# vim /etc/named.rfc1912.zones
zone "peace.com" IN {
        type master;
        file "peace.com.zone";
};
zone "168.192.in-addr.arpa" IN {
        type master;
        file "192.168.zone";
};

# vim /var/named/peace.com.zone
$TTL 600
$ORIGIN peace.com.
@       IN SOA  ns.peace.com.   admin.peace.com. (
                                        2012071501
                                        1H
                                        10M
                                        7D
                                        3H )
        IN      NS      ns
ns      IN      A       192.168.80.139
ns      IN      A       192.168.80.140
www     IN      A       192.168.80.139
www     IN      A       192.168.80.140

# vim /var/named/192.168.zone
$TTL 600
@       IN SOA  ns.peace.com.   admin.peace.com. (
                                        2012071501
                                        1H
                                        10M
                                        7D
                                        3H )
        IN      NS      ns.peace.com.
80.139  IN      PTR     ns.peace.com.
80.140  IN      PTR     ns.peace.com.
80.139  IN      PTR     www.peace.com.
80.140  IN      PTR     www.peace.com.

2）修改权限

# cd /var/named/
# chown .named peace.com.zone 192.168.zone
# chmod 644 peace.com.zone 192.168.zone

3）启动服务，指定DNS服务器

# service named restart
# vim /etc/resolv.conf
nameserver 192.168.80.140

4）通过ping 查看是否有dns轮询：

2、192.168.80.139服务器架构
LAMP的编译就不介绍了，这里直接开始安装论坛

1）先设置mysql的密码

# mysqladmin -u root password 'redhat'

2）修改http配置文件，这里使用的虚拟主机的方式
 

# vim /etc/httpd/httpd.conf,修改如下内容
# DocumentRoot "/usr/local/apache/htdocs"
Include /etc/httpd/extra/httpd-vhosts.conf

# vim /etc/httpd/extra/httpd-vhosts.conf
<VirtualHost *:80>
    DocumentRoot "/web/discuz"
    ServerName www.peace.com
    ErrorLog "logs/www.peace.com-error_log"
    CustomLog "logs/www.peace.com-access_log" common
        <Directory "/web/discuz">
                Options none
                AllowOverride none
                Require all granted
        </Directory>
</VirtualHost>

# vim /etc/php.ini
short_open_tag = On

3）论坛架设

# mkdir /web/discuz -p
# unzip Discuz_7.2_FULL_SC_UTF8.zip -d /web/discuz/

# cd /web/discuz/upload/
# chown -R daemon config.inc.php attachments/ forumdata/ uc_client/data/cache/

重启服务，浏览器输入http://192.168.80.139/upload/install按步骤安装即可
# service httpd restart

论坛已经架构好了

3、192.168.80.140服务器架构
1）配置apache
（1）安装环境，编译安装

# yum -y install pcre-devel

# tar xf apr-1.4.6.tar.bz2
# cd apr-1.4.6
# ./configure --prefix=/usr/local/apr
#  make && make install

# tar xf apr-util-1.4.1.tar.bz2
# cd apr-util-1.4.1
# ./configure --prefix=/usr/local/apr-util --with-apr=/usr/local/apr
# make &&  make install

# tar xf httpd-2.4.2.tar.bz2
# cd httpd-2.4.2
# ./configure --prefix=/usr/local/apache --sysconfdir=/etc/httpd --enable-so --enable-ssl --enable-cgi -enable-rewrite --with-zlib --with-pcre --with-apr=/usr/local/apr --with-apr-util=/usr/local/apr-util
# make && make install

（2）修改配置文件添加如下内容
# vim /etc/httpd/httpd.conf
ServerRoot "/usr/local/apache"
Pidfile "/var/run/httpd.pid

（3）添加启动脚本

#!/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

（4）添加权限，启动服务
# chmod +x /etc/rc.d/init.d/httpd
# chkconfig --add httpd
# service httpd restart

2）安装mysql，注意的是这里装好以后不需启动，因为php编译需要mysql，所以这里的mysql只是为了安装php的

# groupadd -r mysql
# useradd -g mysql -r -s /sbin/nologin -M -d /mydata/data mysql
# mkdir -p /mydata/data
# chown -R mysql.mysql /mydata/data/

# tar xf mysql-5.5.24-linux2.6-i686.tar.gz -C /usr/local/
# cd /usr/local/
# ln -s mysql-5.5.24-linux2.6-i686/ mysql
# cd mysql
# chown -R mysql.mysql .
# scripts/mysql_install_db --user=mysql --datadir=/mydata/data
# chown -R root .
# cp support-files/my-large.cnf /etc/my.cnf

# vim /etc/my.cnf
thread_concurrency = 2
datadir = /mydata/data

# vim /etc/ld.so.conf，添加如下内容
/usr/local/mysql/bin
# ldconfig

3）安装php-5.4.4
（1）安装依赖关系库
# yum -y groupinstall "X Software Development"
让编译的php支持mcrypt扩展，安装以下软件包，这里本机已经安装了，但是版本较低，所以升级安装
libmcrypt-2.5.7-5.el5.i386.rpm
libmcrypt-devel-2.5.7-5.el5.i386.rpm
# rpm -Uvh libmcrypt-*

（2）编译安装

# tar xf php-5.4.4.tar.bz2
# cd php-5.4.4
# ./configure --prefix=/usr/local/php --with-mysql=/usr/local/mysql --with-openssl --with-mysqli=/usr/local/mysql/bin/mysql_config --enable-mbstring --with-freetype-dir --with-jpeg-dir --with-png-dir --with-zlib  --with-libxml-dir=/usr --enable-xml  --with-apxs2=/usr/local/apache/bin/apxs --with-mcrypt --with-config-file-path=/etc --with-config-file-scan-dir=/etc/php.d --with-bz2
# make && make install

（3）复制php配置文件
# cp php.ini-production /etc/php.ini

（4）修改http配置文件，使其支持php

# vim /etc/httpd/httpd.conf
……
   AddType application/x-httpd-php     .php
   AddType application/x-httpd-php-source      .phps
……
<IfModule dir_module>
    DirectoryIndex index.php index.html
</IfModule>
……
# service httpd restart
添加测试页面
# cat /usr/local/apache/htdocs/index.php
<?php
phpinfo();
?>

 

（5）测试访问查看apache和php整合是否成功：

4、139和140两台整合
1）192.168.80.139配置：
（1）将网站目录通过nfs共享出来

# vim /etc/exports
/web/discuz     192.168.80.0/24(rw,no_root_squash)
# service nfs restart

（2）配置mysql数据库，允许从其他机器登录

mysql> GRANT ALL ON discuz.* TO root@'%.%.%.%' IDENTIFIED BY 'redhat';
mysql> FLUSH PRIVILEGES;

2）192.168.80.140配置：
（1）测试与mysql连接是否成功：

# cat /usr/local/apache/htdocs/index.php
<?php
$link=mysql_connect('192.168.80.139','root','redhat');
if ($link)
 echo "Sucess!!";
else
 echo "Failuser!!";
mysql_close();
?>

访问ok

（2）把网页文件挂载过来

# mkdir /web/discuz -p
# mount -t nfs 192.168.80.139:/web/discuz /web/discuz/

（3）修改http配置文件

# vim /etc/httpd/httpd.conf
# DocumentRoot "/usr/local/apache/htdocs"
Include /etc/httpd/extra/httpd-vhosts.conf

# vim /etc/httpd/extra/httpd-vhosts.conf
<VirtualHost *:80>
    DocumentRoot "/web/discuz"
    ServerName www.peace.com
    ErrorLog "logs/www.peace.com-error_log"
    CustomLog "logs/www.peace.com-access_log" common
        <Directory "/web/discuz">
                Options none
                AllowOverride none
                Require all granted
        </Directory>
</VirtualHost>

# vim /etc/php.ini
short_open_tag = On
# service httpd restart

访问下已经有论坛了

（4）修改网页配置文件，指定Mysql数据库

# vim /web/discuz/upload/config.inc.php
$dbhost = '192.168.80.139';
define('UC_DBHOST', '192.168.80.139');
define('UC_IP', '192.168.80.139');

3）验证
访问
http://192.168.80.140/upload/和http://192.168.80.139/upload/都没有问题，之后使用域名验证

在两台上面都执行：
# tailf /usr/local/apache/logs/www.peace.com-access_log，动态监控日志，通过不同浏览器访问发现都有日志记录