https://blog.csdn.net/qq_43442524/article/details/105706017
https://blog.csdn.net/guhong888/article/details/82344775
https://www.jianshu.com/p/d83249b72b06
https://blog.csdn.net/weixin_51052054/article/details/112803200
https://baijiahao.baidu.com/s?id=1672520162384771451&wfr=spider&for=pc

安装依赖

yum install -y curl gcc openssl openssl-devel libnl libnl-devel -y

安装keepalive ipvsadm

yum install keepalived -y

查看安装路径

rpm -ql keepalived

查看网卡设备信息
nmcli device

image.png

vim /etc/sysctl.conf

net.ipv4.ip_forward = 1
#保存退出
sysctl -p

103编写keepalive

! Configuration File for keepalived

global_defs {
   notification_email {
     514840279@qq.com
   }
   notification_email_from 514840279@qq.com
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL_103 # 全局唯一
   vrrp_skip_check_adv_addr
   vrrp_strict
   vrrp_garp_interval 0
   vrrp_gna_interval 0
}

vrrp_instance VI_1 {
    state MASTER
    interface em1
    virtual_router_id 51
    priority 100
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.0.101
    }
}


virtual_server 192.168.0.101 9082 {
    delay_loop 1
    lb_algo rr
    lb_kind DR
    persistence_timeout 50
    protocol TCP

   real_server 192.168.0.105 9082 {
        weight 1
        HTTP_GET|SSL_GET {                    #定义checker的方法(TCP/HTTP/SSL/MISC)
          connect_port 9082            #定义tcp的port
          connect_timeout 3            #定义本次连接的超时时长为3s
          nb_get_retry 3               #定义尝试3次,如果3次都失败则宣告本real_server失效
          delay_before_retry 3         #定义重连接间隔时间为3s

        }
   }

}

# 保存

systemctl restart keepalived
ps -ef | grep keepalived
ip add

image.png

win下

aro -a

image.png

httpd

因为端口80被占需要修改端口 这里统一用9082

105

yum install -y httpd
systemctl stop httpd.service

find /etc/httpd/ -name *.conf
vim /etc/httpd/conf/httpd.conf
# 修改端口为 9082. 
#http 不允许修改默认的80端口，这里需要关闭setenforce 
setenforce 0
systemctl start httpd.service
systemctl enable --now httpd.service
echo server105 > /var/www/html/index.html

103

yum install -y httpd
setenforce 0
systemctl stop httpd.service

find /etc/httpd/ -name *.conf
vim /etc/httpd/conf/httpd.conf
# 修改端口为9082.
systemctl start httpd.service
systemctl enable --now httpd.service
echo server103 > /var/www/html/index.html

配置

同理105上安装keepalive 配置conf
https://www.cnblogs.com/along1226/p/5027838.html
vim /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {
   notification_email {
     514840279@qq.com
   }
   notification_email_from 514840279@qq.com
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL_105 # 唯一
   vrrp_skip_check_adv_addr
   vrrp_strict
   vrrp_garp_interval 0
   vrrp_gna_interval 0
}

vrrp_instance VI_1 {
    state BACKUP  # 备份服务
    interface em1
    virtual_router_id 51  # 主从一致
    priority 50 # 
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.0.101
    }
}


virtual_server 192.168.0.101 9082 {
    delay_loop 1
    lb_algo rr
    lb_kind DR
    persistence_timeout 50
    protocol TCP

    real_server 192.168.0.103 9082 {
        weight 1
        HTTP_GET|SSL_GET{                    #定义checker的方法(TCP/HTTP/SSL/MISC)
          connect_port 9082            #定义tcp的port
          connect_timeout 3            #定义本次连接的超时时长为3s
          nb_get_retry 3               #定义尝试3次,如果3次都失败则宣告本real_server失效
          delay_before_retry 3         #定义重连接间隔时间为3s

        }
   }
   real_server 192.168.0.105 9082 {
        weight 1
        HTTP_GET|SSL_GET{                    #定义checker的方法(TCP/HTTP/SSL/MISC)
          connect_port 9082            #定义tcp的port
          connect_timeout 3            #定义本次连接的超时时长为3s
          nb_get_retry 3               #定义尝试3次,如果3次都失败则宣告本real_server失效
          delay_before_retry 3         #定义重连接间隔时间为3s

        }
   }


}

启动

systemctl start keepalived

开启自启

systemctl enable keepalived

到此处keepalive配置完成，使用ip addr 在103上有ip

image.png
关闭 103的keepalivesystemctl stop keepalived
查看 ip addr 发现 105上有ip
image.png
重启103的keepalive ip又回来了

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