实验目的:
利用nginx均衡两台lamp下Discuz,其中任意一台lamp的web 宕机,不影响discuz的使用!
实验拓扑:
实验环境:
服务器 主机名 IP地址
Nginx服务器 nginx 192.168.1.2
Discuz论坛(主mysql) master 192.168.1.3
Discuz论坛(从mysql) slave 192.168.1.4
Mysql主从授权账户为”tongbu” 密码为”123456”
所有的服务器均是Centos 6.5 x86_x64
实验步骤:
一、安装Nginx服务器
1、安装环境依赖包
[root@nginx ~]# yum -y install pcre pcre-devel gcc openssl-devel
2、下载Nginx并安装
[root@nginx ~]# wget http://nginx.org/download/nginx-1.6.3.tar.gz [root@nginx ~]# tar -zxf nginx-1.6.3.tar.gz [root@nginx ~]# cd nginx-1.6.3 [root@nginx nginx-1.6.3]# ./configure--prefix=/usr/local/nginx --with-http_stub_status_module --with-http_ssl_module [root@nginx ~]#make && make install [root@nginx nginx-1.6.3]#/usr/local/nginx/sbin/nginx ##启动Nginx [root@nginx nginx-1.6.3]# ps -ef | grepnginx root 4432 1 0 22:12 ? 00:00:00 nginx: master process/usr/local/nginx/sbin/nginx nobody 4433 4432 0 22:12 ? 00:00:00 nginx: worker process root 4437 2037 0 22:12 pts/2 00:00:00 grep nginx [root@nginx nginx-1.6.3]#
Nginx安装成功!
二、在主机master上安装lamp环境!
执行脚本Auto_Install_Discuz_V2.sh,选择7 构建LAMP平台!脚本文件在附件当中,内容可参加<<Linux Shell实战之二一键安装Discuz_v2>>
[root@master ~]#./Auto_Install_Discuz_V2.sh 1) Yum install Environment 6) Integrate Php and Mysql 2) Install Apache 7) AutomaticInstall LAMP 3) Install Mysql 8) ConfigureDiscuz 4) Configure Mysql 9) Automatic InstallALL 5) Install Php 10) Exit Please Enter Your choose: 7
脚本中定义的数据库名、数据库用户名、数据库密码都为discuz
执行脚本Auto_Install_Discuz_V2.sh选择7 构建LAMP平台!
四、做mysql主从!
在master上:
默认bin-log和server-id已经开启无需设置!
进入mysql,新建操作主从的用户!
mysql> grant replication slave on *.* to'tongbu'@'%' identified by '123456'; Query OK, 0 rows affected (0.00 sec) mysql> flush privileges; Query OK, 0 rows affected (0.00 sec) mysql> show master status; +------------------+----------+--------------+------------------+ | File | Position | Binlog_Do_DB |Binlog_Ignore_DB | +------------------+----------+--------------+------------------+ | mysql-bin.000003 | 325 | | | +------------------+----------+--------------+------------------+ 1 row in set (0.00 sec) mysql>
在slave上:
把/etc/my.cnf中的server-id改为2 然后重启musql
[root@slave ~]# pkill mysqld [root@slave ~]#/usr/local/mysql/bin/mysqld_safe --user=mysql & [root@slave ~]# /usr/local/mysql/bin/mysql
mysql> change master tomaster_host='192.168.1.3', -> master_user='tongbu', -> master_password='123456', -> master_log_file='mysql-bin.000003', -> master_log_pos=325; Query OK, 0 rows affected (0.03 sec) mysql> slave start; Query OK, 0 rows affected (0.00 sec) mysql> show slave status \G; *************************** 1. row*************************** Slave_IO_State: Waiting formaster to send event Master_Host: 192.168.1.3 Master_User: tongbu Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000003 Read_Master_Log_Pos: 325 Relay_Log_File:slave-relay-bin.000003 Relay_Log_Pos: 251 Relay_Master_Log_File: mysql-bin.000003 Slave_IO_Running: Yes Slave_SQL_Running: Yes Replicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 0 Last_Error: Skip_Counter: 0 Exec_Master_Log_Pos: 325 Relay_Log_Space: 406 Until_Condition: None Until_Log_File: Until_Log_Pos: 0 Master_SSL_Allowed: No Master_SSL_CA_File: Master_SSL_CA_Path: Master_SSL_Cert: Master_SSL_Cipher: Master_SSL_Key: Seconds_Behind_Master: 0 Master_SSL_Verify_Server_Cert: No Last_IO_Errno: 0 Last_IO_Error: Last_SQL_Errno: 0 Last_SQL_Error: 1 row in set (0.01 sec) ERROR: No query specified mysql>
测试主从:
在master上创建一个数据库hi,slave上已同步,主从构建成功!
五、在master上安装discuz论坛
直接利用脚本安装配置Discuz!
脚本中的数据库名、用户名、密码均为”discuz”
开始安装discuz
master上授权(因为脚本中是只允许localhost)
mysql> grant all on *.* to discuz@'%'identified by 'discuz'; Query OK, 0 rows affected (0.02 sec)
这里一定要注意,数据库服务器地址可以写为localhost,但是拷贝discuz论坛文件到mysql从服务器上web发布目录的时候,需要更改discuz配置文件中连接主mysql的IP地址,所以这里建议直接写主服务器的IP地址,这样discuz论坛文件复制到从服务器上的时候,无需更改discuz配置文件。
六、在slave上建立discuz
把master上的apache网站目录打包复制到slave的网络目录再解压(不打包容易出问题)。
分别登录发贴!
登录master上查看
七、Nginx做负载均衡
[root@nginx ~]# vim/usr/local/nginx/conf/nginx.conf
在http中添加以下内容:
upstream discuz { server 192.168.1.3:80 weight=1 max_fails=2 fail_timeout=30s; server 192.168.1.4:80 weight=1 max_fails=2 fail_timeout=30s; } location / { root html; index index.html index.htm; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_pass http://discuz; }
[root@nginx ~]# /usr/local/nginx/sbin/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@nginx ~]# [root@nginx ~]# /usr/local/nginx/sbin/nginx-s reload [root@nginx ~]# [root@nginx ~]# ps -ef | grep nginx root 4351 1 0 20:57 ? 00:00:00 nginx: master process/usr/local/nginx/sbin/nginx nobody 13696 4351 0 23:31 ? 00:00:00 nginx: worker process root 13698 1924 0 23:31 pts/0 00:00:00 grep nginx [root@nginx ~]#
访问nginx服务器测试!
停止master上的http
[root@master ~]#/usr/local/apache/bin/apachectl stop [root@master ~]# [root@master ~]# ps -ef | grep httpd root 53460 1715 0 23:34 pts/0 00:00:00 grep httpd [root@master ~]#
master上的web已经无法访问!
访问nginx可以继续发帖,此时已经指向slave!
至此,实验已经全部结束!至于说如果Nginx服务器挂了,Mysql主服务器挂了,如何保证论坛网站的高可用呢?会在后续博客继续写......