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keepalived高可用反向代理的nginx

实验系统:

(1)CentOS 6.6_x86_64;

(2)共有三台主机,本实验以ip地址来命名主机,即131主机、132主机、133主机。

实验前提:防火墙和selinux都关闭,主机之间时间同步

实验软件:nginx-x86_64-1.6.2 keepalived-x86_64-1.2.13

实验拓扑:

keepalived高可用反向代理的nginx

一、安装配置keepalived

1.直接使用yum安装,133主机只安装nginx:

yum -y install keepalived nginx

2.在131主机上配置keepalived:

vim /etc/keepalived/keepalived.conf -------------------------------------------- ! Configuration File for keepalived global_defs {       //此段配置忽略    notification_email {   acassen@firewall.loc   failover@firewall.loc   sysadmin@firewall.loc    }    notification_email_from Alexandre.Cassen@firewall.loc    smtp_server 192.168.200.1    smtp_connect_timeout 30    router_id LVS_DEVEL }  vrrp_instance VI_1 {  state MASTER      //定义为MASTER主机  interface eth0  virtual_router_id 55   //虚拟id  priority 100    //优先级 advert_int 1      //检测间隔  authentication {   auth_type PASS     //认证方式   auth_pass abcd     //认证密码  }  virtual_ipaddress {   192.168.245.150    //虚拟ip,即VIP  }  notify_master "/etc/init.d/nginx start"  //成为MASTER之后执行的动作  notify_backup "/etc/init.d/nginx stop"   //成为BACKUP之后执行的动作  notify_fault "/etc/init.d/nginx stop"    //FAULT之后执行的动作 } 

3.将配置文件传到132主机,并配置:

vim /etc/keepalived/keepalived.conf -------------------------------------------------- 只改动如下两行 state BACKUP         //定义为BACKUP priority 99          //优先级

4.两台主机启动keepalived服务,现在131这台主机为MASTER,所以服务都起在这台主机上:

service keepalived start
ip addr show

keepalived高可用反向代理的nginx

keepalived高可用反向代理的nginx

5.停止131主机的keepalived服务,可以看到服务已经转移到了132这台主机上:

service keepalived stop

keepalived高可用反向代理的nginx

6.再次启动131主机的keepalived服务,从日志可以看出,它又成为了MASTER:

keepalived高可用反向代理的nginx

二、配置nginx的反向代理

1.131和132主机配置nginx:

vim /etc/nginx/conf.d/default.conf ---------------------------------------------- location / {                                              //增加此段         proxy_pass http://192.168.245.133; }

#location / { //将此段注释掉
# root /usr/share/nginx/html;
# index index.html index.htm;
# example
#ModSecurityEnabled on;
#ModSecurityConfig /etc/nginx/modsecurity.conf;
#}
----------------------------------------------
service nginx restart
service keepalived restart

2.133主机启动测试页:

rm -rf /usr/share/nginx/html/*                 //删除原有页面文件 vim /usr/share/nginx/html/index.html --------------------------------------------- <h1>This is a test!</h1> ---------------------------------------------
service nginx start

访问http://192.168.245.150,133主机上的页面文件出现,反向代理成功。关闭131主机的keepalived服务,132主机变为MASTER,页面仍然可以访问。但是,当nginx进程被kill掉时,并不能实现高可用。

keepalived高可用反向代理的nginx

至此,实验演示完毕,谢谢! 如有问题,请与我联系,QQ:82800452

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