【 Linux 】lvs-dr模型实现HA，后端Nginx、PHP、MySQL分离 搭建wordpress站点

要求：
    1. wordpress程序通过nfs共享给各个realserver
    2. 后端realserver中的nginx和php分离

网络结构图：

环境说明：
    OS：centos6.7 x64
    主机IP：
        LVS-DR(director): 192.168.2.10
        realsever1 web1 Nginx: 192.168.2.11
        realserver2 web2 Nginx: 192.168.2.12
        PHP server: 192.168.2.13
        MySQL server: 192.168.2.14
    主机名：
        lvs-dr: 192.168.2.10
        realserver1: 192.168.2.11
        realserver2: 192.168.2.12
        php-server: 192.168.2.13
        mysql-server: 192.168.2.14
    selinux: disabled
    内网iptables: off

一、安装nginx、MySQL

1. Nginx 安装：
    需要安装的主机：
        Nginx:192.168.2.11、192.168.2.12
        MySQL:192.168.2.14

192.168.2.11:

(1) 搭建本地yum源：

[root@realserver1 yum.repos.d]# yum install gcc* -y     # 安装gcc开发环境，为了编译安装nginx使用
[root@realserver1 yum.repos.d]# yum install ntpdate wget -y     # ntpdate 时间同步，wget 下载nginx
[root@realserver1 yum.repos.d]# ntpdate -s tiger.sina.com.cn     # 同步时间
[root@realserver1 src]# wget http://mirrors.sohu.com/nginx/nginx-1.9.9.tar.gz     # 下载nginx-1.9.9包
[root@realserver1 src]# groupadd -g  www
[root@realserver1 src]# useradd -u  -g  -s /sbin/nologin www     # 创建nginx worker进程工作用户
[root@realserver1 nginx-1.9.]# yum install zlib zlib-devel pcre pcre-devel openssl openssl-devel -y
# pcre 支持正则表达式
# zlib 支持数据压缩
# openssl支持HTTPS
[root@realserver1 src]# tar xf nginx-1.9..tar.gz
[root@realserver1 src]# cd nginx-1.9.
[root@realserver1 nginx-1.9.]# ./configure --prefix=/usr/local/nginx --user=nginx --group=nginx --with-http_ssl_module --with-http_stub_status_module --with-http_gzip_static_module --with-http_realip_module  --with-pcre
# --with-http_ssl_module 启用HTTPS加密
# --with-http_stub_status_module 启用nginx状态监控
# --with-http_gzip_static_module  启用静态压缩
# --with-http_realip_module 做代理时获取客户端真实IP
[root@realserver1 nginx-1.9.]# make && make install

[root@realserver1 nginx-1.9.]# vim /etc/init.d/nginx     # 创建nginx服务脚本
#!/bin/sh
#
# nginx - this script starts and stops the nginx daemon
#
# chkconfig: -
# description: Nginx is an HTTP(S) server, HTTP(S) reverse \
#   proxy and IMAP/POP3 proxy server
# processname: nginx
# config: /etc/nginx/nginx.conf
# config: /etc/sysconfig/nginx
# pidfile: /var/run/nginx.pid
# Source function library.
. /etc/rc.d/init.d/functions
# Source networking configuration.
. /etc/sysconfig/network
# Check that networking is up.
[ "$NETWORKING" = "no" ] && exit
    nginx="/usr/local/nginx/sbin/nginx"
    prog=$(basename $nginx)
    NGINX_CONF_FILE="/usr/local/nginx/conf/nginx.conf"
[ -f /etc/sysconfig/nginx ] && . /etc/sysconfig/nginx
    lockfile=/var/lock/subsys/nginx 

start() {
    [ -x $nginx ] || exit
    [ -f $NGINX_CONF_FILE ] || exit
    echo -n $"Starting $prog: "
    daemon $nginx -c $NGINX_CONF_FILE
    retval=$?
    echo
[ $retval -eq  ] && touch $lockfile
    return $retval
} 

stop() {
    echo -n $"Stopping $prog: "
    killproc $prog -QUIT
    retval=$?
    echo
[ $retval -eq  ] && rm -f $lockfile
    return $retval
    killall - nginx
} 

restart() {
    configtest || return $?
    stop
    sleep
    start
} 

reload() {
    configtest || return $?
    echo -n $"Reloading $prog: "
    killproc $nginx -HUP
    RETVAL=$?
    echo
} 

force_reload() {
    restart
} 

configtest() {
    $nginx -t -c $NGINX_CONF_FILE
} 

rh_status() {
    status $prog
} 

rh_status_q() {
    rh_status >/dev/null >&
} 

case "$1" in
    start)
        rh_status_q && exit
        $
    ;;
    stop)
        rh_status_q || exit
        $
    ;;
    restart|configtest)
        $
    ;;
    reload)
        rh_status_q || exit
        $
    ;;
    force-reload)
        force_reload
    ;;
    status)
        rh_status
    ;;
    condrestart|try-restart)
        rh_status_q || exit
    ;;
    *)
        echo $"Usage: $0 {start|stop|status|restart|condrestart|try-restart|reload|force-reload|configtest}"
        exit
esac 

[root@realserver1 conf]# chmod +x /etc/init.d/nginx
[root@realserver1 nginx-1.9.]# cd /usr/local/nginx/conf/
[root@realserver1 conf]# vim nginx.conf
   user  www www;
[root@realserver1 conf]# vim /etc/profile.d/nginx.sh
[root@realserver1 conf]# source /etc/profile.d/nginx.sh
[root@realserver1 conf]# nginx -t
nginx: the configuration file /usr/local/nginx/conf/nginx.conf syntax is ok
nginx: configuration file /usr/local/nginx/conf/nginx.conf test is successful
[root@realserver1 conf]# service nginx start
正在启动 nginx：                                           [确定]
[root@realserver1 conf]# chkconfig --add nginx
[root@realserver1 conf]# chkconfig nginx on
[root@realserver1 conf]# chkconfig --list nginx
nginx              :关闭    :关闭    :启用    :启用    :启用    :启用    :关闭

[root@realserver1 conf]# curl -I http://192.168.2.11     # 测试本地访问nginx服务
HTTP/1.1  OK
Server: nginx/1.9.
Date: Sun,  Jun  :: GMT
Content-Type: text/html
Content-Length:
Last-Modified: Sun,  Jun  :: GMT
Connection: keep-alive
ETag: "576635c4-264"
Accept-Ranges: bytes

测试客户端访问：

修改nginx配置文件如下：

行号
          location / {
              root   /webapp;
              index  index.html index.htm;
          }

          location ~ \.php$ {
              root           /webapp;
              fastcgi_pass   192.168.2.13:;
              fastcgi_index  index.php;
              include        fastcgi.conf;
          }
保存退出

[root@realserver1 conf]# mkdir /webapp
[root@realserver1 conf]# chown -R www:www /webapp/
[root@realserver1 conf]# nginx -t
nginx: the configuration file /usr/local/nginx/conf/nginx.conf syntax is ok
nginx: configuration file /usr/local/nginx/conf/nginx.conf test is successful
[root@realserver1 conf]# service nginx reload
nginx: the configuration file /usr/local/nginx/conf/nginx.conf syntax is ok
nginx: configuration file /usr/local/nginx/conf/nginx.conf test is successful
重新载入 nginx：                                           [确定]

realserver2 nginx配置如上同样进行配置，这里不在贴代码。

(2) MySQL: 192.168.2.14:

[root@mysql-server ~]# wget http://mirrors.sohu.com/mysql/MySQL-5.6/mysql-5.6.31-linux-glibc2.5-x86_64.tar.gz
[root@mysql-server ~]# tar xf mysql-5.6.-linux-glibc2.-x86_64.tar.gz -C /usr/local/
[root@mysql-server local]# groupadd -g  mysql
[root@mysql-server local]# useradd -u  -g  -s /sbin/nologin mysql
[root@mysql-server local]# mkdir -pv /mydata/data
mkdir: created directory `/mydata'
mkdir: created directory `/mydata/data'
[root@mysql-server local]# chown -R mysql:mysql /mydata/
[root@mysql-server local]# cd mysql
[root@mysql-server mysql]# chown -R root:mysql .
[root@mysql-server mysql]# yum install libaio -y
[root@mysql-server mysql]# ./scripts/mysql_install_db --user=mysql --datadir=/mydata/data/
[root@mysql-server mysql]# cp -a support-files/mysql.server /etc/init.d/mysqld
[root@mysql-server mysql]# chmod +x /etc/init.d/mysqld
[root@mysql-server mysql]# mv /etc/my.cnf /etc/my.cnf_old
[root@mysql-server mysql]# cp -a support-files/my-default.cnf /etc/my.cnf
[root@mysql-server mysql]# vim /etc/my.cnf
# 添加如下一条
datadir=/mydata/data
[root@mysql-server mysql]# ln -vs /usr/local/mysql/include /usr/include/mysql
`/usr/include/mysql' -> `/usr/local/mysql/include'
[root@mysql-server mysql]# vim /etc/ld.so.conf.d/mysql.conf
[root@mysql-server mysql]# ldconfig -v | less
[root@mysql-server mysql]# service mysqld start
Starting MySQL. SUCCESS!
[root@mysql-server mysql]# ss -ntl | grep
LISTEN                                  :::                    :::*

到此，nignx和mysql安装完毕。

(3) php 安装：

[root@php-server yum.repos.d]# yum install wget gcc* -y
# 添加epel源
[root@php-server ~]# vim /etc/yum.repos.d/epel-centos6.repo
[epel]
name=Extra Packages for Enterprise Linux  - $basearch
baseurl=http://download.fedoraproject.org/pub/epel/6/$basearch
#mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-6&arch=$basearch
failovermethod=priority
enabled=
gpgcheck=
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6

[epel-debuginfo]
name=Extra Packages for Enterprise Linux  - $basearch - Debug
baseurl=http://download.fedoraproject.org/pub/epel/6/$basearch/debug
#mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-debug-6&arch=$basearch
failovermethod=priority
enabled=
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6
gpgcheck=

[epel-source]
name=Extra Packages for Enterprise Linux  - $basearch - Source
baseurl=http://download.fedoraproject.org/pub/epel/6/SRPMS
#mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-source-6&arch=$basearch
failovermethod=priority
enabled=
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6
gpgcheck=
保存退出

# 安装php源码包的依赖包
[root@php-server yum.repos.d]# yum install libmcrypt libmcrypt-devel mhash mhash-devel install libxml2-devel openssl openssl-devel bzip2-devel libcurl-devel gd -y
# gd-devel-2.0.-.el6.x86_64.rpm 从网上下载到的包安装，直接百度搜包名就有。
[root@php-server ~]# yum localinstall gd-devel-2.0.-.el6.x86_64.rpm -y
[root@php-server ~]# groupadd -g  www
[root@php-server ~]# useradd -u  -g  -s /sbin/nologin www     # 创建运行php worker进程用户
[root@php-server ~]# cd /usr/local/src/
[root@php-server src]# wget http://mirrors.sohu.com/php/php-5.6.7.tar.gz
[root@php-server php-5.6.]# cd php-5.6.
[root@php-server php-5.6.]# ./configure --prefix=/usr/local/php --enable-fpm --enable-ftp --enable-zip \
--enable-xml --enable-sockets --enable-bcmath --enable-pcntl --enable-shmop --enable-soap --enable-sysvsem \
--enable-mbstring --enable-mbregex --enable-inline-optimization --enable-maintainer-zts --enable-gd-native-ttf \
--with-fpm-user=www --with-fpm-group=www --with-mysql --with-mysqli --with-pdo-mysql --with-openssl --with-freetype-dir \
--with-iconv-dir --with-jpeg-dir --with-png-dir --with-libxml-dir=/usr --with-curl  --with-zlib --with-bz2 --with-xmlrpc \
--with-gd --with-config-file-path=/usr/local/php/etc --with-config-file-scan-dir=/usr/local/php/etc/php.d
[root@php-server php-5.6.]# make && make install
# 编译时间比较长
[root@php-server php-5.6.]# cp -a sapi/fpm/init.d.php-fpm /etc/init.d/php-fpm
[root@php-server php-5.6.]# chmod +x /etc/init.d/php-fpm
[root@php-server php-5.6.]# cp -a php.ini-production /usr/local/php/etc/php.ini
[root@php-server php-5.6.]# cd /usr/local/php/etc/
[root@php-server etc]# cp -a php-fpm.conf.default php-fpm.conf
[root@php-server etc]# vim php-fpm.conf     # 修改监听地址
 listen = 192.168.2.13:
[root@php-server etc]# service php-fpm start
Starting php-fpm  done
[root@php-server etc]# ss -ntl | grep
LISTEN                       192.168.2.13:                     *:*
[root@php-server etc]# chkconfig --add php-fpm
[root@php-server etc]# chkconfig php-fpm on
[root@php-server etc]# iptables -F
[root@php-server etc]# iptables -X
[root@php-server etc]# iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
[root@php-server etc]# iptables -A INPUT -p tcp -m multiport --sport , -m state --state NEW -j ACCEPT
[root@php-server etc]# iptables -P INPUT DROP
[root@php-server etc]# service iptables save
iptables: Saving firewall rules to /etc/sysconfig/iptables:[  OK  ]
[root@php-server etc]# service iptables restart
iptables: Setting chains to policy ACCEPT: filter          [  OK  ]
iptables: Flushing firewall rules:                         [  OK  ]
iptables: Unloading modules:                               [  OK  ]
iptables: Applying firewall rules:                         [  OK  ]

php 安装完毕。

(3) nginx 连接 php
nginx对于php的配置上面已经写过了：
修改nginx配置文件如下：

行号
          location / {
              root   /webapp;
              index  index.html index.htm;
          }

          location ~ \.php$ {
              root           /webapp;
              fastcgi_pass   192.168.2.13:;
              fastcgi_index  index.php;
              include        fastcgi.conf;
          }
保存退出

连接nfs共享web程序
php-sever 192.168.2.13 设置如下：

[root@php-server etc]# yum install nfs-utils -y     # 使用桌面虚拟机可能会碰到nfs需要重启下机器的情况
[root@php-server ~]# service nfs start
Starting NFS services:                                     [  OK  ]
Starting NFS mountd:                                       [  OK  ]
Starting NFS daemon:                                       [  OK  ]
Starting RPC idmapd:                                       [  OK  ]
[root@php-server ~]# showmount -e 192.168.2.13
Export list for 192.168.2.13:
/webapp 192.168.2.0/

# 让两台nginx服务器挂载 192.168.2.11、192.168.2.12

[root@realserver1 ~]# mount -t nfs 192.168.2.13:/webapp/ /webapp/
[root@realserver2 ~]# mount -t nfs 192.168.2.13:/webapp/ /webapp/

# 下载wordpress并上传到服务器
[root@php-server ~]# unzip wordpress-4.5.-zh_CN.zip
[root@php-server ~]# cp -a wordpress/* /webapp/
[root@php-server ~]# chown -R www:www /webapp/

在数据库服务器(192.168.2.14)上建立wordpress数据库并赋予权限

[root@mysql-server mysql]# /usr/local/mysql/bin/mysql
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is
Server version: 5.6. MySQL Community Server (GPL)

Copyright (c) , , Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> CREATE DATABASE wordpress;
Query OK,  row affected (0.02 sec)

mysql> GRANT ALL ON wordpress.* TO 'wordpress'@'192.168.2.13' IDENTIFIED BY '';
Query OK,  rows affected (0.02 sec)

mysql> FLUSH PRIVILEGES;
Query OK,  rows affected (0.00 sec)
mysql> Bye

通过页面访问安装wordpress

填写数据库信息

安装完毕。

realserver1 和 realserver2 都指向了一个站点，并能正常访问。

(4) lvs-dr搭建

vip: 192.168.2.200

director配置如下：

[root@lvs-dr ~]# yum install ipvsadm
[root@lvs-dr ~]# ifconfig eth0: 192.168.2.200/ broadcast 192.168.2.200 up
[root@lvs-dr ~]# route add -host 192.168.2.200 dev eth0:
[root@lvs-dr ~]# ip a
: lo: <LOOPBACK,UP,LOWER_UP> mtu  qdisc noqueue state UNKNOWN
    link/loopback ::::: brd :::::
    inet 127.0.0.1/ scope host lo
    inet6 ::/ scope host
       valid_lft forever preferred_lft forever
: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu  qdisc pfifo_fast state UP qlen
    link/ether :0c::::4f brd ff:ff:ff:ff:ff:ff
    inet 192.168.2.10/ brd 192.168.2.255 scope global eth0
    inet 192.168.2.200/ brd 192.168.2.200 scope global eth0:
    inet6 fe80::20c:29ff:fe39:924f/ scope link
       valid_lft forever preferred_lft forever

接下来给realserver 添加vip

net.ipv4.conf.all.arp_ignore =
net.ipv4.conf.all.arp_announce =
net.ipv4.conf.lo.arp_ignore =
net.ipv4.conf.lo.arp_announce =
[root@realserver1 ~]# sysctl -p
[root@realserver1 ~]# ifconfig lo: 192.168.2.200/ broadcast 192.168.2.200 up
[root@realserver1 ~]# route add -host 192.168.2.200 dev lo:

另一台realserver2 一样的操作

在lvs-dr主机添加规则如下：

[root@lvs-dr ~]# ipvsadm -A -t 192.168.2.200: -s rr
[root@lvs-dr ~]# ipvsadm -a -t 192.168.2.200: -r 192.168.2.11 -g -w
[root@lvs-dr ~]# ipvsadm -a -t 192.168.2.200: -r 192.168.2.12 -g -w
[root@lvs-dr ~]# ipvsadm -L -n
IP Virtual Server version 1.2. (size=)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  192.168.2.200: rr
  -> 192.168.2.11:              Route
  -> 192.168.2.12:              Route                    

浏览器访问http://192.168.2.200

访问成功。到此，本次实验完成。

由此引发的问题：
    1. lvs工作在四层，自身不具备后端realserver自动检测的功能，需要对lvs配备后端检测的功能
    2. 此架构不太完善，基于这种物理环境做简单调整会更好，如下图：