nginx + keepalived

小灰灰 2022-05-12 01:34 113阅读 0赞

1、准备2台机器，192.168.1.11、192.168.1.12  vip 192.168.1.20

vip 的设置 即在2台已经分配好静态IP的机器中做如下配置（2台机器都要）

vim /etc/sysconfig/network-scripts/ifcfg-eno16777736
    #插入公共IP
    
    IPADDR1=192.168.1.20
    
    
    ##配置完成莫忘记执行下面command
    
    service network restart
    systemctl stop firewalld

2、2台机器中都部署nginx 这个不赘述了，因为我做的是一主一备所以搭建的2台机器的nginx.conf配置是一致的

3、下载安装keepalived

#下载地址http://www.keepalived.org/
    tar xf keepalived-1.3.4.tar.gz
    mv keepalived-1.3.4 keepalived
    cd keepalived
    yum install -y libnl*
    yum install -y libnfnetlink-devel zlib zlib-devel gcc gcc-c++ openssl openssl-devel openssh
    ./configure --prefix=/data/keepalived
    make && make install

复制/sbin/keepalived到/usr/sbin下

cp /data/keepalived/sbin/keepalived /usr/sbin/
    
    mkdir /etc/keepalived
    cp /data/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf
    cp /data/keepalived/etc/sysconfig/keepalived /etc/sysconfig/

复制启动脚本到/etc/init.d下

cd /data/keepalived-1.3.4
    cp /usr/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
    chmod 755 /etc/init.d/keepalived

4、配置keepalived配置文件 这里我把192.168.1.11当做主192.168.1.12当做备机

vi /etc/keepalived/keepalived.conf
    ##192.168.1.11
    
    global_defs {
       notification_email {
         test@163.com
       }
       notification_email_from Keepalived@localhost
       smtp_server 163@smtp.com
       smtp_connect_timeout 30
       router_id 192.168.1.11
    }
    vrrp_script chk_nginx {
    script "/etc/keepalived/ck_ng.sh"
        interval 2
        weight -5
        fall 3
        rise 2
    }
    
    vrrp_instance VI_1 {
        state MASTER
        interface eno16777736
        mcast_src_ip 192.168.1.11
        virtual_router_id 55
        priority 100
        advert_int 1
        authentication {
            auth_type PASS
            auth_pass 123456
        }
        virtual_ipaddress {
        192.168.1.20/24
            }
      track_script {
           chk_nginx
        }
      smtp_alert
    }
    
    
    ##192.168.1.12 备机
    global_defs {
       notification_email {
         test@163.com
       }
       notification_email_from Keepalived@localhost
       smtp_server 163@smtp.com
       smtp_connect_timeout 30
       router_id 192.168.1.11
    }
    vrrp_script chk_nginx {
    script "/etc/keepalived/ck_ng.sh"
        interval 2
        weight -5
        fall 3
        rise 2
    }
    
    vrrp_instance VI_1 {
        state BACKUP
        interface eno16777736
        mcast_src_ip 192.168.1.12
        virtual_router_id 55
        priority 99
        advert_int 1
        authentication {
            auth_type PASS
            auth_pass 123456
        }
        virtual_ipaddress {
        192.168.1.20/24
            }
      track_script {
           chk_nginx
        }
      smtp_alert
    }

5、启动2台机器的nginx 和keepalived

./nginx

配置完成后使用192.168.1.11和192.168.1.12访问2台nginx是可以访问的，但是使用虚拟的vip192.168.1.20访问是不可能访问通的，但是没有关系  ，在这2台机器中都启动keepalived就可以使用这个ip访问这个主备机器了，启动命令

service keepalived start

到此，主备nginx用keepalive配置完毕

6、验证配置是否成功

由于如上我配置的master机器是192.168.1.11 ，备机是192.168.1.12，

1）若将192.168.1.12这台机器的nginx宕机，使用192.168.1.20访问nginx不会受到影响，

2）若将192.168.1.11这台机器的nginx宕机，使用192.168.1.20访问nginx会受到影响，大约10s会自动恢复，去访问备机。至于为何10s恢复这个和上面的keepalived配置有关

3）通过access.log去查看请求都是进入主机并且都是192.168.1.20 转发的304请求

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[70]: /images/20220512/59ad338a500f4f5c8303e9e060ae3328.png