编译安装Keepalived，实现热备并监听指定端口

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前言

1、编译环境

系统：CentOS
Master IP：172.16.10.200
Backup IP：172.16.10.201
VIP：172.16.10.254

2、脚本使用说明

1、sh install_keepalived.sh 虚拟地址 运行VRRP的网卡 监听的端口 主备状态
如：在ens32接口上运行VRRP协议，状态为MASTER，VIP地址为172.16.10.254，并监听443端口是否正常运行
sh install_keepalived.sh 172.16.10.254 ens32 443 MASTER

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一、MASTER部署

###1、直接执行

sh install_keepalived.sh 172.16.10.254 ens32 443 MASTER

2、出现以下界面即编译安装成功，安装目录为/usr/local/keepalived/，配置文件位置为/usr/local/etc/keepalived/keepalived.conf

二、BACKUP部署

1、运行

sh install_keepalived.sh 172.16.10.254 ens32 443 BACKUP

2、出现以下界面即编译安装完成

三、抓包分析

正常状态下的Master会向网络中不断发送通告报文

注意事项：
1、 运行VRRP协议需要防火墙允许224.0.0.18出入站
2、 如果想修改keepalived配置可通过运行keepalived_conf.sh修改
如：sh keepalived_conf.sh 172.16.10.254 ens32 22 MASTER

四、代码区

安装脚本

#!/bin/sh

VIP="$1"
eth="$2"
ports="$3"
status="$4"

wget https://www.keepalived.org/software/keepalived-2.2.7.tar.gz
tar -zxf keepalived-2.2.7.tar.gz
cd keepalived-2.2.7
yum install  gcc-c++  openssl-devel -y
./configure --prefix=/usr/local/keepalived
make&&make install
ln -s /usr/local/keepalived/sbin/keepalived  /usr/local/sbin/ 
mkdir /usr/local/etc/keepalived/


if [ "$status" = "MASTER" ];then
pri="150"
else
pri="120"
fi

mkdir /usr/local/etc/keepalived/
echo > /usr/local/etc/keepalived/keepalived.conf
cat >/usr/local/etc/keepalived/keepalived.conf<<EOF
vrrp_script chk_port {
        script "</dev/tcp/127.0.0.1/$ports"
        interval 1
        weight -50
}

vrrp_instance VI_1 {
    state $status
    interface $eth
    garp_master_delay 10
    virtual_router_id 51
    priority $pri
    advert_int 1
    virtual_ipaddress {
        $ip_addr
                        }
track_script {
       chk_port
                   }
                        }
EOF

systemctl enable  keepalived&&systemctl restart keepalived&&systemctl status keepalived

复制保存为install_keepalived.sh，然后sh install_keepalived.sh

改配置脚本

#!/bin/sh

VIP="$1"
eth="$2"
ports="$3"
status="$4"

if [ "$status" = "MASTER" ];then
pri="150"
else
pri="120"
fi

mkdir /usr/local/etc/keepalived/
echo > /usr/local/etc/keepalived/keepalived.conf
cat >/usr/local/etc/keepalived/keepalived.conf<<EOF
vrrp_script chk_port {
        script "</dev/tcp/127.0.0.1/$ports"
        interval 1
        weight -50
}

vrrp_instance VI_1 {
    state $status
    interface $eth
    garp_master_delay 10
    virtual_router_id 51
    priority $pri
    advert_int 1
    virtual_ipaddress {
        $ip_addr
			}
track_script {
       chk_port
 		   }
			}
EOF

systemctl enable  keepalived&&systemctl restart keepalived&&systemctl status keepalived

复制保存为keepalived_conf.sh，用法详见注意事项