1.用户通过浏览器输入url
  http://jxl.wecenter.com
2.先查看app缓存，也就是浏览器cookie缓存
3.如果app没有缓存再查看DNS解析
  1）本地DNS缓存
  2）主机hosts解析
  3）本地DNS服务器，通过递归查询将解析请求发送给内网、网关、ISP
  4）本地DNS服务器再通过迭代查询将解析请求发送至公网DNS服务器
4.通过解析到的web服务器的IP地址跟web服务器建立tcp连接
  1）通过私网交换机、路由器、防火墙等网络设备传递或验证
  2）和调度器建立三次握手
5.调度器会和web集群建立三次握手，将HTTP请求发送至web服务器
发送过程中有三个动作
  1）general
    URL http://jxl.wecenter.com
    动作  get
    状态码 200
    解析的IP 10.0.0.7
  2）Req header
    属性  文件类型、加密、编码、压缩等
    长连接 keepalive
    Host  jxl.rewrite.com
    User-Agent  用户使用的浏览器
  3）Rep header
      长连接
      属性
        文件类型、编码
      server
        服务器使用的软件
6.web服务器收到http请求
  1）静态页面
    .html
      nginx自己处理
        图片、视频、附件类文件：NFS
        网页内容、用户信息：MySQL
  2）动态页面
    .php
      Nnginx无法处理，交给php-fpm（127.0.0.1:9000）插件来实现
7.Nginx通过fastcgi协议，将请求发送至php-fpm
8.php-fpm调用wrapper线程，将php代码交于php解析器
9.php解析器解析php代码
  1）如果是代码直接返回至nginx
  2）如果涉及到查询数据库，就会与mysql建立tcp连接
10.返回

1.在web上备份数据库
[root@jxl log]# mysqldump -uroot -p123 --all-databases --single-transaction > `date +%F%H`-mysql-all.sql
mysqldump -uroot -p123 使用root用户来做mysql备份
--all-databases 所有数据库
--single-transaction  数据一致性
2.拷贝备份数据库文件至新的数据库服务器上
[root@jxl log]# scp 2020-04-2915-mysql-all.sql  root@192.168.81.230:/root/
3.导入数据库
扩展：mysql自身提供安全初始化脚本
[root@localhost ~]# mysql_secure_installation
输出数据库的root密码，全程y，是否禁止root登录可以选择，如果要改密码中间需要输入两次新密码
[root@localhost ~]# mysql -uroot -p123 < 2020-04-2915-mysql-all.sql
4.登录数据库验证导入是否成功
[root@localhost ~]# mysql -uroot -p123
mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| wecenter           |
| wordpress          |
| xyshop             |
+--------------------+
6 rows in set (0.00 sec)
mysql> use wecenter;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> desc aws_users_qq;
+---------------+---------------------+------+-----+---------+----------------+
| Field         | Type                | Null | Key | Default | Extra          |
+---------------+---------------------+------+-----+---------+----------------+
| id            | bigint(11) unsigned | NO   | PRI | NULL    | auto_increment |
| uid           | int(11)             | NO   | MUL | NULL    |                |
| nickname      | varchar(64)         | YES  |     | NULL    |                |
| openid        | varchar(128)        | YES  | MUL |         |                |
| gender        | varchar(8)          | YES  |     | NULL    |                |
| add_time      | int(10)             | YES  | MUL | NULL    |                |
| access_token  | varchar(64)         | YES  | MUL | NULL    |                |
| refresh_token | varchar(64)         | YES  |     | NULL    |                |
| expires_time  | int(10)             | YES  |     | NULL    |                |
| figureurl     | varchar(255)        | YES  |     | NULL    |                |
+---------------+---------------------+------+-----+---------+----------------+
10 rows in set (0.00 sec)
5.关闭原来服务器的mysql后，会发现页面访问失败
6.修改应用配置文件，指定新的数据库位置
利用grep找到配置文件路径
[root@jxl wecenter]# grep -R '192.168.81.220' | grep -v cache
system/config/database.php:  'host' => '192.168.81.220',
编辑此文件
[root@jxl wecenter]# vim system/config/database.php
<?php
$config['charset'] = 'utf8mb4';
$config['prefix'] = 'aws_';
$config['driver'] = 'MySQLi';
$config['master'] = array (
  'charset' => 'utf8mb4',
  'host' => '192.168.81.230',
  'username' => 'root',
  'password' => '123',
  'dbname' => 'wecenter',
);
$config['slave'] = false;
7.刷新页面即可

查看这个博客
https://blog.csdn.net/weixin_43815140/article/details/105311944
也就是把php的监听地址修成0.0.0.0即可

1.安装nfs
[root@localhost ~]# yum -y install nfs-util rpcbind
2.配置共享目录
[root@localhost ~]# vim /etc/exprots
/data/wordpress 172.16.1.0/24(rw,sync,no_root_squash)
/data/wecenter  172.16.1.0/24(rw,sync,no_root_squash)
3.启动nfs
[root@localhost ~]# systemctl restart nfs rpcbind
4.查看共享目录
[root@localhost ~]# showmount -e
Export list for localhost.localdomain:
/data/wecenter  172.16.1.0/24
/data/wordpress 172.16.1.0/24
5.挂载
[root@localhost ~]# mount 172.16.1.10:/data/wordpress web/wordpress/wp-content

1.安装nginx
[root@localhost ~]# scp -rp /etc/nginx/* root@192.168.81.230:/etc/nginx/
2.安装php
[root@localhost ~]# scp -rp /etc/php-fpm.d/* root@192.168.81.230:/etc/php-fpm.d
3.将网站源码直接从web01上拷贝过来
[root@localhost ~]# tar cvfP web.tar.gz /web
[root@localhost ~]# scp web.tar.gz root@192.168.81.230:/root
4.常见用户和组
[root@localhost ~]# useradd www
5.挂载nfs
[root@localhost ~]# mount 172.16.1.10:/data/wordpress web/wordpress/wp-content
6.启动nginx、php-fpm
[root@localhost ~]# systemctl reload nginx php-fpm

1.安装nginx、php
[root@localhost ~]# mkdir soft
[root@localhost ~]# cd soft
[root@localhost soft]# rpm -ivh nginx-1.16.1-1.el7.ngx.x86_64.rpm 
[root@localhost php]# sh php_install.sh
2.创建用户
[root@localhost ~]# groupadd -g 666 www
[root@localhost ~]# useradd -u 666 -g 666 -s /sbin/nologin www
3.配置Nginx、PHP
[root@localhost ~]# sed -i '/^user/c user www;' /etc/nginx/nginx.conf
[root@localhost conf.d]# sed -ri '/^user/c user = www' /etc/php-fpm.d/www.conf 
[root@localhost conf.d]# sed -ri '/^group/c group = www' /etc/php-fpm.d/www.conf
4.启动nginx、php
[root@localhost conf.d]# systemctl restart nginx php-fpm
[root@localhost conf.d]# systemctl enable nginx php-fpm
5.创建知乎、wordpress站点配置文件
[root@localhost conf.d]# rename .conf .conf.bak *.conf
[root@localhost conf.d]# vim wordpress.conf
#wordpress
server {
  listen 80;
  server_name jxl.wordpress.com;
  root /web/wordpress;
  index index.php index.html;
  access_log /nginx_log/jxl_wordpress_access.log main;  
  location ~ \.php$ {
    root /web/wordpress;
    fastcgi_pass 127.0.0.1:9000;
    fastcgi_index index.php;
    fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
    include fastcgi_params;
  }
}
[root@localhost conf.d]# vim wecenter.conf
#wecenter
server {
  listen 80;
  server_name jxl.wecenter.com;
  root /web/wecenter;
  index index.php index.html;
  access_log /nginx_log/jxl_wecenter_access.log main;
  location ~ \.php$ {
    root /web/wecenter;
    fastcgi_pass 127.0.0.1:9000;
    fastcgi_index index.php;
    fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
    include fastcgi_params;
  }
}
6.获取wordpress、wecenter源码
[root@localhost src]# unzip -d wecenter WeCenter_3-3-4.zip 
[root@localhost src]# unzip wordpress-5.2.3-zh_CN.zip 
[root@localhost src]# mv wecenter/ wordpress /web/
[root@localhost /]# chown -R www:www /web/
7.重载服务器
[root@localhost conf.d]# systemctl restart nginx php-fpm

1.安装mysql
[root@jxl soft]# rpm -ivh mysql-community-common-5.6.47-2.el7.x86_64.rpm 
[root@jxl soft]# rpm -ivh mysql-community-libs-5.6.47-2.el7.x86_64.rpm 
[root@jxl soft]# rpm -ivh mysql-community-client-5.6.47-2.el7.x86_64.rpm 
[root@jxl soft]# rpm -ivh mysql-community-server-5.6.47-2.el7.x86_64.rpm 
2.启动mysql
3.初始化mysql
[root@jxl ~]# mysql_secure_installation
mysql_root密码---y---设置新密码---y----n----y----y
4.创建wordpress、wecenter所用数据库并创建用户
[root@jxl ~]# mysql -uroot -p123
mysql> create database wordpress;
mysql> create database wecenter;
mysql> grant all on wordpress.* to 'wpadmin'@'%' identified by '123';
mysql> grant all on wecenter.* to 'wcadmin'@'%' identified by '123';

[root@localhost ~]# yum -y install nfs-utils
[root@localhost ~]# vim /etc/exports
/data/wordpress /data/wordpress 172.16.1.0/24(rw,sync,all_squash,anonuid=666,anongid=666)
/data/wecenter  172.16.1.0/24(rw,sync,all_squash,anonuid=666,anongid=666)
[root@localhost ~]# systemctl restart nfs rpcbind
[root@localhost ~]# showmount -e
Export list for localhost.localdomain:
/data/wecenter  172.16.1.0/24
/data/wordpress 172.16.1.0/24
注意NFS如果指定uid、gid，客户端上必须存在和他一样uid、gid的用户

wordpress
1.先将站点存放文件的目录备份便于挂载后还原
[root@localhost wordpress]# cp -r wp-content/ wp-content_bak
2.挂载
[root@localhost wordpress]# mount 172.16.1.10:/data/wordpress /web/wordpress/wp-content
3.还原
[root@localhost wordpress]# mv wp-content_bak/* wp-content/
4.永久挂载
[root@localhost wordpress]# vim /etc/fstab
172.16.1.10:/data/wordpress /web/wordpress/wp-content nfs defaults 0 0
wecenter
1.知乎默认没有任何附件，直接挂载即可
2.挂载
 mount 172.16.1.10:/data/wecenter /web/wecenter/uploads/
3.永久挂载
[root@localhost wordpress]# vim /etc/fstab
172.16.1.10:/data/wecenter      /web/wecenter/uploads   nfs     defaults 0 0

1.将源码打包
[root@localhost web]# tar cfP wecenter.tar.gz wecenter/
[root@localhost web]# tar cfP wordpress.tar.gz wordpress/
2.将源码推送其他web节点
[root@localhost ~]# scp /web/*.tar.gz root@192.168.81.220:/web/
[root@localhost ~]# scp /web/*.tar.gz root@192.168.81.230:/web/
3.将站点配置文件推送至web节点
[root@localhost ~]# scp /etc/nginx/conf.d/*.conf root@192.168.81.220:/etc/nginx/conf.d/
[root@localhost ~]# scp /etc/nginx/conf.d/*.conf root@192.168.81.230:/etc/nginx/conf.d/
4.在web节点解包
[root@jxl ~]# tar xf wecenter.tar.gz 
[root@jxl ~]# tar xf wordpress.tar.gz 
5.挂载nfs
[root@jxl ~]# vim /etc/fstab
172.16.1.10:/data/wordpress     /web/wordpress/wp-content nfs defaults 0 0 
172.16.1.10:/data/wecenter      /web/wecenter/uploads nfs defaults 0 0 
[root@jxl ~]# mount -a
6.创建用户赋权限
[root@jxl ~]# groupadd -g 666 www
[root@jxl ~]# useradd -u 666 -g 666 -s /sbin/nologin www
7.重载nginx
[root@jxl ~]# systemctl reload nginx