LVS#Haproxy+Keepalived高可用

Keepalived + Haproxy + nginx

先是两台nginx服务器配置不同网站发布页面，便于区分
然后Haprox给nginx做负载均衡
最后keepalived给Haproxy做高可用
上一篇博客已经完成Haproxy给nginx做负载均衡，这一片博客主要是Keepalived给Haproxy实现高可用

Keepalived + Haproxy实验操作

1、haproxy-master 192.168.138.133

slave安装好haproxy后
[root@haproxy-master ~]# \scp /etc/haproxy/haproxy.cfg 192.168.138.131:/etc/haproxy/haproxy.cfg
[root@haproxy-master ~]# vim /etc/keepalived/keepalived.conf 

! Configuration File for keepalived

global_defs {
    
    
   router_id director1
}
vrrp_instance VI_1 {
    
    
    state MASTER
    interface ens33
    virtual_router_id 80
    priority 100
    advert_int 1
    authentication {
    
    
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
    
    
        192.168.138.200/24
    }
}
[root@haproxy-master ~]# systemctl start keepalived
[root@haproxy-master ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1
    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 pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:e7:33:2b brd ff:ff:ff:ff:ff:ff
    inet 192.168.138.133/24 brd 192.168.138.255 scope global dynamic ens33
       valid_lft 1244sec preferred_lft 1244sec
    inet 192.168.138.200/24 scope global secondary ens33
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fee7:332b/64 scope link 
       valid_lft forever preferred_lft forever

2、haproxy-slave 192.168.138.131

[root@haproxy-slave ~]# yum -y install haproxy
[root@haproxy-slave ~]# vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived

global_defs {
    
    
   router_id directory2
}
vrrp_instance VI_1 {
    
    
    state BACKUP
    interface ens33
    nopreempt
    virtual_router_id 80
    priority 50
    advert_int 1
    authentication {
    
    
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
    
    
        192.168.138.200/24
    }
}
[root@haproxy-slave ~]# systemctl start keepalived

3、浏览器访问验证，keepalived爆头验证

验证vip访问是否正常


爆头验证

4、对调度器Haproxy做健康检查

[root@haproxy-master ~]# cat /etc/keepalived/check_haproxy.sh 
#!/bin/bash

curl -I http://localhost &>/dev/null
if [ $? -ne 0 ];then
    systemctl stop keepalived
fi
[root@haproxy-master ~]# vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived

global_defs {
    
    
   router_id director1
}
vrrp_script check_haproxy {
    
    
   script "/etc/keepalived/check_haproxy.sh"
   interval 5
}
vrrp_instance VI_1 {
    
    
    state MASTER
    interface ens33
    virtual_router_id 80
    priority 100
    advert_int 1
    authentication {
    
    
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
    
    
        192.168.138.200/24
    }
    track_script {
    
    
        check_haproxy
    }
}