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keepalived高可用(haporxy)

时间：2022-10-10 07:23:35浏览次数：87  
标签：haproxy 00 可用 backup keepalived 192.168 master root haporxy

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 [email protected]:/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.
[email protected]'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

标签：haproxy,00,可用,backup,keepalived,192.168,master,root,haporxy
From： https://www.cnblogs.com/tushanbu/p/16774298.html

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