基于Keepalived+Varnish+Nginx实现的高可用LAMP架构

原理图：

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Nginx+keepalived   高可用

主：192.168.80.181

从：192.168.80.182

在两台虚拟机上都做的操作：

关闭firewalld（systemctl stop firewalld.service，systemctl disable firewalld.service），设置selinux为permissive（setenforce 0 或 vim /etc/selinux/config）；同时确保DR1和DR2节点的网卡支持MULTICAST（多播）通信。通过命令ifconfig可以查看到是否开启了MULTICAST：

释放网络yum源 挂载光盘 NAT模式联网

yum install epel-release -y  //安装一个epel源 

yum install keepalived  Nginx -y  //安装keepalived服务

vi /etc/keepalived/keepalived.conf

   //修改后的配置文件

! Configuration File for keepalived

global_defs {
   route_id Nginx-01
}

vrrp_script Nginx {
        script "/opt/Nginx.sh"
        interval 2
        weight -10
}

vrrp_instance VI_1 {
    state MASTER
    interface ens32
    virtual_router_id 51
! Configuration File for keepalived
! Configuration File for keepalived

global_defs {
   route_id Nginx-01
}

vrrp_script Nginx {
        script "/opt/Nginx.sh"        
        interval 2
        weight -10
}

vrrp_instance VI_1 {
    state MASTER
    interface ens32
    virtual_router_id 51
    priority 150
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
}
 track_script {
 Nginx
 }

 virtual_ipaddress {
        192.168.80.188
}

 scp /etc/keepalived/keepalived.conf [email protected]:/etc/keepalived/keepalived.conf   //发送到从服务器

编写脚本主脚本 ：

 vi /opt/Nginx.sh

 //脚本内容

#!/bin/bash
A=$(ps -ef | grep keepalived | grep -v grep | wc -l )
if [ $A -gt 0 ];then
        systemctl start Nginx
else
        systemctl stop Nginx
fi

chmod +x /opt/Nginx.sh

systemctl start keepalived

netstat -anpt | grep Nginx

编写 从 脚本：

#!/bin/bash
A=$(ip addr | grep 192.168.80.188/32 | grep -v grep | wc-l)
if [ $A -gt 0];then
        systemctl start Nginx
else
        systemctl stop Nginx
fi

因为主服务器keepalived开启的原因，从的并无法开启，可以cat /var/log/messages查看

vi /etc/Nginx/Nginx.conf

scp /etc/Nginx/Nginx.conf 192.168.80.182:/etc/Nginx/Nginx.conf

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.

varnish服务器 两台 192.168.80.183  192.168.80.184

yum   install epel-release -y

yum install varnish -y

vi /etc/varnish/varnish.params

vi /etc/varnish/default.vcl

backend web1 {
    .host = "192.168.80.185";
    .port = "80";
}
backend web2 {
    .host = "192.168.80.186";
    .port = "80";
}

sub vcl_recv {
if ( req.url ~ "(?i)\.PHP$") {
    set  req.backend_hint = web1;
} else {
    set  req.backend_hint = web2;
}

varnishd -C -f /etc/varnish/default.vcl  > /dev/null    //检测语法有没有问题  无输出说明没有问题

systemctl start varnish

netstat -anpt | grep varnish

两台操作一样。

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LAMP 一台提供静态网页一台提供动态网页 192.168.80.185  192.168.80.186   （都是仅主机模式）

192.168.80.185  提供动态网页

systemctl stop firewalld

setenforce 0

 yum install -y httpd mariadb-server mariadb PHP PHP-MysqL PHP-gd libjpeg* PHP-ldap PHP-odbc PHP-pear PHP-xml PHP-xmlrpc PHP-mhash

vi /etc/httpd/conf/httpd.conf

echo "<h1>192.168.80.181</h1>" > /var/www/html/index.PHP

192.168.80.186  提供静态网页

vi /etc/httpd/conf/httpd.conf

echo "<h1>192.168.80.182</h1>" > /var/www/html/index.html

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