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keepalived高可用(haporxy)

tushanbu 2023-03-28 原文

keepalived高可用(haporxy)

目录

keepalived高可用的介绍可以参考keepalived高可用(nginx)
环境

系统信息 主机名 IP 服务
centos8 master 192.168.222.250 haproxy,keepalived
centos8 backup 192.168.222.137 haproxy,keepalived
centos8 RS1 192.168.222.138 httpd
centos8 RS2 192.168.222.139 nginx

部署httpd,nginx

RS1

[root@localhost ~]# hostnamectl set-hostname RS1
[root@localhost ~]# bash
[root@RS1 ~]# systemctl stop firewalld.service //关闭防火墙
[root@RS1 ~]# vim /etc/selinux/config 
SELINUX=disabled
[root@RS1 ~]# setenforce 0
[root@RS1 ~]# systemctl disable --now firewalld.service 
Removed /etc/systemd/system/multi-user.target.wants/firewalld.service.
Removed /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service.
[root@RS1 ~]# dnf -y install wget
[root@RS1 ~]# cd /etc/yum.repos.d/
[root@RS1 yum.repos.d]# wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-vault-8.5.2111.repo
//配置阿里源
[root@RS1 yum.repos.d]#sed -i -e '/mirrors.cloud.aliyuncs.com/d' -e '/mirrors.aliyuncs.com/d' /etc/yum.repos.d/CentOS-Base.repo
[root@RS1 yum.repos.d]# ls
CentOS-Base.repo
[root@RS1 yum.repos.d]# cd
[root@RS1 ~]# dnf -y install httpd
[root@RS1 ~]# echo "RS1" > /var/www/html/index.html
[root@RS1 ~]# cat  /var/www/html/index.html
RS1
[root@RS1 ~]# systemctl enable --now httpd
Created symlink /etc/systemd/system/multi-user.target.wants/httpd.service → /usr/lib/systemd/system/httpd.service.
[root@RS1 ~]# ss -antl  //查看80端口
State      Recv-Q     Send-Q          Local Address:Port           Peer Address:Port     Process     
LISTEN     0          128                   0.0.0.0:111                 0.0.0.0:*                    
LISTEN     0          32              192.168.122.1:53                  0.0.0.0:*                    
LISTEN     0          128                   0.0.0.0:22                  0.0.0.0:*                    
LISTEN     0          128                      [::]:111                    [::]:*                    
LISTEN     0          128                         *:80                        *:*                    
LISTEN     0          128                      [::]:22                     [::]:*

访问:

RS2

[root@localhost ~]# hostnamectl set-hostname RS2
[root@localhost ~]# bash
[root@RS2 ~]# systemctl stop firewalld.service  //关闭防火墙
[root@RS2 ~]# vim /etc/selinux/config 
SELINUX=disabled
[root@RS2 ~]# setenforce 0
[root@RS2 ~]# systemctl disable --now firewalld.service 
Removed /etc/systemd/system/multi-user.target.wants/firewalld.service.
Removed /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service.
[root@RS2 ~]# dnf -y install wget
[root@RS2 ~]# cd /etc/yum.repos.d/
[root@RS2 yum.repos.d]# wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-vault-8.5.2111.repo
//配置阿里源
[root@RS2 yum.repos.d]#sed -i -e '/mirrors.cloud.aliyuncs.com/d' -e '/mirrors.aliyuncs.com/d' /etc/yum.repos.d/CentOS-Base.repo
[root@RS2 yum.repos.d]# ls
CentOS-Base.repo
[root@RS2 yum.repos.d]# cd
[root@RS2 ~]# dnf -y install nginx
[root@RS2 ~]# echo "RS2" > /usr/share/nginx/html/index.html 
[root@RS2 ~]# cat /usr/share/nginx/html/index.html 
RS2
[root@RS2 ~]# systemctl enable --now nginx
Created symlink /etc/systemd/system/multi-user.target.wants/nginx.service → /usr/lib/systemd/system/nginx.service.
[root@RS2 ~]# ss -antl     //查看80端口
State      Recv-Q     Send-Q          Local Address:Port           Peer Address:Port     Process     
LISTEN     0          128                   0.0.0.0:22                  0.0.0.0:*                    
LISTEN     0          128                   0.0.0.0:80                  0.0.0.0:*                    
LISTEN     0          128                      [::]:22                     [::]:*                    
LISTEN     0          128                      [::]:80                     [::]:*

访问:

部署haproxy负载均衡

master

[root@localhost ~]# hostnamectl set-hostname master
[root@localhost ~]# bash
[root@master ~]# systemctl stop firewalld.service //关闭防火墙
[root@master ~]# vim /etc/selinux/config
SELINUX=disabled 
[root@master ~]# setenforce 0
[root@master ~]# systemctl disable --now firewalld.service 
Removed /etc/systemd/system/multi-user.target.wants/firewalld.service.
Removed /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service.
[root@master ~]# dnf -y install wget
[root@master ~]# cd /etc/yum.repos.d/
[root@master yum.repos.d]# wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-vault-8.5.2111.repo
//配置阿里源
[root@master yum.repos.d]#sed -i -e '/mirrors.cloud.aliyuncs.com/d' -e '/mirrors.aliyuncs.com/d' /etc/yum.repos.d/CentOS-Base.repo
[root@master yum.repos.d]# ls
CentOS-Base.repo
[root@master yum.repos.d]# cd
[root@master ~]# useradd -rMs /sbin/nologin haproxy
//创建用户
[root@master ~]# dnf -y install make gcc pcre-devel bzip2-devel openssl-devel systemd-devel  vim
//安装依赖包
[root@master ~]# wget https://src.fedoraproject.org/repo/pkgs/haproxy/haproxy-2.6.0.tar.gz/sha512/7bb70bfb5606bbdac61d712bc510c5e8d5a5126ed8827d699b14a2f4562b3bd57f8f21344d955041cee0812c661350cca8082078afe2f277ff1399e461ddb7bb/haproxy-2.6.0.tar.gz
//下载haproxy压缩包
[root@master ~]# ls
anaconda-ks.cfg  haproxy-2.6.0.tar.gz
[root@master ~]# tar -xf haproxy-2.6.0.tar.gz  //解压
[root@master ~]# cd haproxy-2.6.0/
[root@master haproxy-2.6.0]#  make -j $(grep 'processor' /proc/cpuinfo |wc -l)  \
> TARGET=linux-glibc  \
> USE_OPENSSL=1  \
> USE_ZLIB=1  \
> USE_PCRE=1  \
> USE_SYSTEMD=1
[root@master haproxy-2.6.0]# make install PREFIX=/usr/local/haproxy
//安装
[root@master haproxy-2.6.0]# cp haproxy  /usr/sbin/
//复制命令到/usr/sbin目录下
[root@master haproxy-2.6.0]# cd
[root@master ~]# vim /etc/sysctl.conf
net.ipv4.ip_nonlocal_bind = 1
net.ipv4.ip_forward = 1
[root@master ~]# sysctl -p
net.ipv4.ip_nonlocal_bind = 1
net.ipv4.ip_forward = 1
//修改内核参数，等于号前后有空格
[root@master ~]# mkdir /etc/haproxy
[root@master ~]# vim /etc/haproxy/haproxy.cfg //修改配置文件
[root@master ~]# cat /etc/haproxy/haproxy.cfg 
global
    daemon
    maxconn 256
 
defaults
    mode http
    timeout connect 5000ms
    timeout client 50000ms
    timeout server 50000ms
 
frontend http-in
    bind *:80
    default_backend servers
 
backend servers
    server web01 192.168.222.138:80
    server web02 192.168.222.139:80
[root@master ~]# vim /usr/lib/systemd/system/haproxy.service
//编写service文件
[root@master ~]# cat /usr/lib/systemd/system/haproxy.service
[Unit]
Description=HAProxy Load Balancer
After=syslog.target network.target
 
[Service]
ExecStartPre=/usr/local/haproxy/sbin/haproxy -f /etc/haproxy/haproxy.cfg   -c -q
ExecStart=/usr/local/haproxy/sbin/haproxy -Ws -f /etc/haproxy/haproxy.cfg  -p /var/run/haproxy.pid
ExecReload=/bin/kill -USR2 $MAINPID
 
[Install]
WantedBy=multi-user.target
[root@master ~]# systemctl daemon-reload 
[root@master ~]# systemctl start haproxy.service 
//启动服务
[root@master ~]# ss -antl
State      Recv-Q     Send-Q          Local Address:Port           Peer Address:Port     Process     
LISTEN     0          128                   0.0.0.0:80                  0.0.0.0:*                    
LISTEN     0          128                   0.0.0.0:22                  0.0.0.0:*                    
LISTEN     0          128                      [::]:22                     [::]:*
[root@master ~]# curl 192.168.222.250
RS1
[root@master ~]# curl 192.168.222.250
RS2
[root@master ~]# curl 192.168.222.250
RS1
[root@master ~]# curl 192.168.222.250
RS2        
//测试负载均衡效果

backup

[root@localhost ~]# hostnamectl set-hostname backup
[root@localhost ~]# bash
[root@backup ~]# vim /etc/selinux/config  //关闭防火墙
SELINUX=disabled
[root@backup ~]# setenforce 0
[root@backup ~]# systemctl disable --now firewalld.service 
Removed /etc/systemd/system/multi-user.target.wants/firewalld.service.
Removed /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service.
[root@backup ~]# dnf -y install wget
[root@backup ~]# cd /etc/yum.repos.d/
[root@backup yum.repos.d]# wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-vault-8.5.2111.repo
//配置阿里源
[root@backup yum.repos.d]#sed -i -e '/mirrors.cloud.aliyuncs.com/d' -e '/mirrors.aliyuncs.com/d' /etc/yum.repos.d/CentOS-Base.repo
[root@backup yum.repos.d]# ls
CentOS-Base.repo
[root@backup yum.repos.d]# cd
[root@backup ~]# useradd -rMs /sbin/nologin haproxy
//创建用户
[root@backup ~]# dnf -y install make gcc pcre-devel bzip2-devel openssl-devel systemd-devel  vim
//下载依赖包
[root@backup ~]# wget https://src.fedoraproject.org/repo/pkgs/haproxy/haproxy-2.6.0.tar.gz/sha512/7bb70bfb5606bbdac61d712bc510c5e8d5a5126ed8827d699b14a2f4562b3bd57f8f21344d955041cee0812c661350cca8082078afe2f277ff1399e461ddb7bb/haproxy-2.6.0.tar.gz
//下载haproxy压缩包
[root@backup ~]# ls
anaconda-ks.cfg  haproxy-2.6.0.tar.gz
[root@backup ~]# tar -xf haproxy-2.6.0.tar.gz  //解压
[root@backup ~]# cd haproxy-2.6.0/
[root@backup haproxy-2.6.0]# make -j $(grep 'processor' /proc/cpuinfo |wc -l)  \
> TARGET=linux-glibc  \
> USE_OPENSSL=1  \
>  USE_ZLIB=1  \
> USE_PCRE=1  \
> USE_SYSTEMD=1
[root@backup haproxy-2.6.0]# make install PREFIX=/usr/local/haproxy
//安装
[root@backup haproxy-2.6.0]# cp haproxy /usr/sbin/
//复制命令到/usr/sbin目录下
[root@backup haproxy-2.6.0]# cd
[root@backup ~]# vim /etc/sysctl.conf
net.ipv4.ip_nonlocal_bind = 1
net.ipv4.ip_forward = 1
[root@backup ~]# sysctl -p
net.ipv4.ip_nonlocal_bind = 1
net.ipv4.ip_forward = 1
//修改内核参数,等于号前后都要空格
[root@backup ~]# vim /etc/haproxy/haproxy.cfg //修改配置文件
[root@backup ~]# cat /etc/haproxy/haproxy.cfg
global
    daemon
    maxconn 256
 
defaults
    mode http
    timeout connect 5000ms
    timeout client 50000ms
    timeout server 50000ms
 
frontend http-in
    bind *:80
    default_backend servers
 
backend servers
    server web01 192.168.222.138:80
    server web02 192.168.222.139:80
[root@backup ~]# vim /usr/lib/systemd/system/haproxy.service
[root@backup ~]# cat /usr/lib/systemd/system/haproxy.service
[Unit]
Description=HAProxy Load Balancer
After=syslog.target network.target
 
[Service]
ExecStartPre=/usr/local/haproxy/sbin/haproxy -f /etc/haproxy/haproxy.cfg   -c -q
ExecStart=/usr/local/haproxy/sbin/haproxy -Ws -f /etc/haproxy/haproxy.cfg  -p /var/run/haproxy.pid
ExecReload=/bin/kill -USR2 $MAINPID
 
[Install]
WantedBy=multi-user.target
//编写service文件
[root@backup ~]# systemctl daemon-reload 
[root@backup ~]# systemctl start haproxy.service 
//启动服务
[root@backup ~]# ss -antl
State      Recv-Q     Send-Q          Local Address:Port           Peer Address:Port     Process     
LISTEN     0          128                   0.0.0.0:22                  0.0.0.0:*                    
LISTEN     0          128                   0.0.0.0:80                  0.0.0.0:*                    
LISTEN     0          128                      [::]:22                     [::]:*  
[root@backup ~]# curl 192.168.222.137
RS1
[root@backup ~]# curl 192.168.222.137
RS2
[root@backup ~]# curl 192.168.222.137
RS1
[root@backup ~]# curl 192.168.222.137
RS2
//测试负载均衡效果
[root@backup ~]# systemctl stop haproxy.service 
//关闭backup上面的haproxy

部署keepalived高可用

master

[root@master ~]# dnf -y install keepalived
//安装keepalived
[root@master ~]# cd /etc/keepalived/
[root@master keepalived]# ls
keepalived.conf
[root@master keepalived]# mv keepalived.conf{,-bak}
//备份一下配置文件
[root@master keepalived]# ls
keepalived.conf-bak
[root@master keepalived]# vim keepalived.conf  //编写新的配置文件
[root@master keepalived]# cat keepalived.conf
! Configuration File for keepalived

global_defs {
   router_id lb01
}

vrrp_instance VI_1 {        //这里主备节点需要一致
    state BACKUP
    interface ens33      //网卡
    virtual_router_id 51
    priority 100     //这里比备节点的高
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass tushanbu   //密码(可以随机生成)
    }
    virtual_ipaddress {
        192.168.222.133    //高可用虚拟IP（VIP）地址
    }
}

virtual_server 192.168.222.133 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    persistence_timeout 50
    protocol TCP

    real_server 192.168.222.250 80 {
        weight 1
        TCP_CHECK {
            connect_port 80
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }

    real_server 192.168.222.137 80 {
        weight 1
        TCP_CHECK {
            connect_port 80
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }
}
[root@master keepalived]# ls
keepalived.conf  keepalived.conf-bak
[root@master keepalived]# systemctl enable --now keepalived.service 
Created symlink /etc/systemd/system/multi-user.target.wants/keepalived.service → /usr/lib/systemd/system/keepalived.service.
[root@master keepalived]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 00:0c:29:05:f4:28 brd ff:ff:ff:ff:ff:ff
    inet 192.168.222.250/24 brd 192.168.222.255 scope global noprefixroute ens33
       valid_lft forever preferred_lft forever
    inet 192.168.222.133/32 scope global ens33
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fe05:f428/64 scope link 
       valid_lft forever preferred_lft forever
//此时备节点的keepalived还没有启动
测试:(访问vip)
[root@master ~]# curl 192.168.222.133
RS1
[root@master ~]# curl 192.168.222.133
RS2
[root@master ~]# curl 192.168.222.133
RS1
[root@master ~]# curl 192.168.222.133
RS2

backup

[root@backup ~]# dnf -y install keepalived
//安装keepalived
[root@backup ~]# cd /etc/keepalived/
[root@backup keepalived]# ls
keepalived.conf
[root@backup keepalived]# mv keepalived.conf{,-bak}
[root@backup keepalived]# ls
keepalived.conf-bak
//备份一下配置文件
[root@backup keepalived]# vim keepalived.conf
//编写新的配置文件
[root@backup keepalived]# cat keepalived.conf
! Configuration File for keepalived

global_defs {
   router_id lb02    
}

vrrp_instance VI_1 {       //这里主备节点需要一致
    state BACKUP
    interface ens33      //网卡
    virtual_router_id 51
    priority 90     //这里比主节点的小
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass tushanbu   //密码(可以随机生成)
    }
    virtual_ipaddress {
        192.168.222.133    //高可用虚拟IP（VIP）地址
    }
}

virtual_server 192.168.222.133 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    persistence_timeout 50
    protocol TCP

    real_server 192.168.222.250 80 {
        weight 1
        TCP_CHECK {
            connect_port 80
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }

    real_server 192.168.222.137 80 {
        weight 1
        TCP_CHECK {
            connect_port 80
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }
}
[root@backup keepalived]# systemctl enable --now keepalived.service 
Created symlink /etc/systemd/system/multi-user.target.wants/keepalived.service → /usr/lib/systemd/system/keepalived.service.

编写脚本

master

[root@master ~]# mkdir /scripts
[root@master ~]# cd /scripts/
[root@master scripts]# vim check_haproxy.sh
[root@master scripts]# cat check_haproxy.sh
#!/bin/bash

haproxy_status=$(ps -ef|grep -Ev "grep|$0"|grep '\bhaproxy\b'|wc -l)
if [ $haproxy_status -lt 1 ];then
    systemctl stop keepalived
fi
[root@master scripts]# chmod +x check_haproxy.sh 
[root@master scripts]# ll
total 4
-rwxr-xr-x. 1 root root 149 Oct 10 02:50 check_haproxy.sh
[root@master scripts]# vim notify.sh
[root@master scripts]# cat notify.sh
#!/bin/bash
VIP=$2
case "$1" in
    master)
        haproxy_status=$(ps -ef|grep -Ev "grep|$0"|grep '\bhaproxy\b'|wc -l)
        if [ $haproxy_status -lt 1 ];then
            systemctl start haproxy
        fi
    ;;
    backup)
        haproxy_status=$(ps -ef|grep -Ev "grep|$0"|grep '\bhaproxy\b'|wc -l)
        if [ $haproxy_status -gt 0 ];then
            systemctl stop haproxy
        fi
    ;;
    *)
        echo "Usage:$0 master|backup VIP"
    ;;
esac
[root@master scripts]# chmod +x notify.sh 
[root@master scripts]# ll
total 8
-rwxr-xr-x. 1 root root 149 Oct 10 02:50 check_haproxy.sh
-rwxr-xr-x. 1 root root 413 Oct 10 02:56 notify.sh

backup

[root@backup keepalived]# cd
[root@backup ~]# mkdir /scripts
[root@backup ~]# cd /scripts/
[root@backup scripts]# scp root@192.168.222.250:/scripts/notify.sh .
The authenticity of host '192.168.222.250 (192.168.222.250)' can't be established.
ECDSA key fingerprint is SHA256:y11UDaNXs3AnvVUnZQfAim2VHAplF09YOvQp2NemHyk.
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
Warning: Permanently added '192.168.222.250' (ECDSA) to the list of known hosts.
root@192.168.222.250's password: 
notify.sh                                                          100%  413   429.2KB/s   00:00    
[root@backup scripts]# ll
total 4
-rwxr-xr-x. 1 root root 413 Oct 10 02:58 notify.sh

配置keepalived加入监控脚本的配置

master

[root@master scripts]# cd
[root@master ~]# vim /etc/keepalived/keepalived.conf
[root@master ~]# cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived

global_defs {
   router_id lb01
}

vrrp_script haproxy_check {                             //添加
    script "/scripts/check_haproxy.sh"
    interval 1
    weight -20
}

vrrp_instance VI_1 {        //这里主备节点需要一致
    state BACKUP
    interface ens33      //网卡
    virtual_router_id 51
    priority 100     //这里比备节点的高
    advert_int 5
    authentication {
        auth_type PASS
        auth_pass tushanbu   //密码(可以随机生成)
    }
    virtual_ipaddress {
        192.168.222.133    //高可用虚拟IP（VIP）地址
    }
    track_script {                      //添加
        haproxy_check                   //添加
    }                                   //添加
    notify_master "/scripts/notify.sh master 192.168.222.133"  //添加
}

virtual_server 192.168.222.133 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    persistence_timeout 50
    protocol TCP

    real_server 192.168.222.250 80 {
        weight 1
        TCP_CHECK {
            connect_port 80
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }

    real_server 192.168.222.137 80 {
        weight 1
        TCP_CHECK {
            connect_port 80
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }
}
[root@master ~]# systemctl restart keepalived.service

backup

[root@backup ~]# vim /etc/keepalived/keepalived.conf
[root@backup ~]# cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived

global_defs {
   router_id lb02    
}

vrrp_instance VI_1 {       //这里主备节点需要一致
    state BACKUP
    interface ens33      //网卡
    virtual_router_id 51
    priority 90     //这里比主节点的小
    advert_int 5
    authentication {
        auth_type PASS
        auth_pass tushanbu   //密码(可以随机生成)
    }
    virtual_ipaddress {
        192.168.222.133    //高可用虚拟IP（VIP）地址
    }
    notify_master "/scripts/notify.sh master 192.168.222.133"           //添加
    notify_backup "/scripts/notify.sh backup 192.168.222.133"           //添加
}

virtual_server 192.168.222.133 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    persistence_timeout 50
    protocol TCP

    real_server 192.168.222.250 80 {
        weight 1
        TCP_CHECK {
            connect_port 80
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }

    real_server 192.168.222.137 80 {
        weight 1
        TCP_CHECK {
            connect_port 80
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }
}
[root@backup ~]# systemctl restart keepalived.service

测试

模拟haproxy服务故障
master端

[root@master ~]# ip a   //有vip
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 00:0c:29:05:f4:28 brd ff:ff:ff:ff:ff:ff
    inet 192.168.222.250/24 brd 192.168.222.255 scope global noprefixroute ens33
       valid_lft forever preferred_lft forever
    inet 192.168.222.133/32 scope global ens33
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fe05:f428/64 scope link 
       valid_lft forever preferred_lft forever
[root@master ~]# curl 192.168.222.133
RS1
[root@master ~]# curl 192.168.222.133
RS2
[root@master ~]# systemctl stop haproxy.service 
[root@master ~]# systemctl restart keepalived.service 
[root@master ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 00:0c:29:05:f4:28 brd ff:ff:ff:ff:ff:ff
    inet 192.168.222.250/24 brd 192.168.222.255 scope global noprefixroute ens33
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fe05:f428/64 scope link 
       valid_lft forever preferred_lft forever

backup
backup变成主

[root@backup ~]# systemctl start haproxy.service 
[root@backup ~]# systemctl restart keepalived.service 
[root@backup ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 00:0c:29:c7:0e:b2 brd ff:ff:ff:ff:ff:ff
    inet 192.168.222.137/24 brd 192.168.222.255 scope global noprefixroute ens33
       valid_lft forever preferred_lft forever
    inet 192.168.222.133/32 scope global ens33
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fec7:eb2/64 scope link 
       valid_lft forever preferred_lft forever
[root@backup ~]# curl 192.168.222.133
RS1
[root@backup ~]# curl 192.168.222.133
RS2
[root@backup ~]# curl 192.168.222.133
RS1
[root@backup ~]# curl 192.168.222.133
RS2

启动master端的haproxy服务
master
master变回主

[root@master ~]# systemctl start haproxy.service 
[root@master ~]# systemctl restart keepalived.service 
[root@master ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 00:0c:29:05:f4:28 brd ff:ff:ff:ff:ff:ff
    inet 192.168.222.250/24 brd 192.168.222.255 scope global noprefixroute ens33
       valid_lft forever preferred_lft forever
    inet 192.168.222.133/32 scope global ens33
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fe05:f428/64 scope link 
       valid_lft forever preferred_lft forever
[root@master ~]# curl 192.168.222.133
RS1
[root@master ~]# curl 192.168.222.133
RS2
[root@master ~]# curl 192.168.222.133
RS1
[root@master ~]# curl 192.168.222.133
RS2

backup

[root@backup ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 00:0c:29:c7:0e:b2 brd ff:ff:ff:ff:ff:ff
    inet 192.168.222.137/24 brd 192.168.222.255 scope global noprefixroute ens33
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fec7:eb2/64 scope link 
       valid_lft forever preferred_lft forever
keepalivedhaporxyroothaproxy操作系统

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