5、haproxy+keepalived实现负载均衡与高可用

haproxy+keepalived实现负载均衡与高可用

环境：

主机名	ip地址	规格	系统	说明
k8s-haproxy-01	172.31.3.144	2C4G	Ubuntu Server 20.04	master 节点
k8s-haproxy-01	172.31.3.145	2C4G	Ubuntu Server 20.04	backup 节点

下载keepalived和haproxy

root@k8s-haproxy-01:~# apt install -y keepalived haproxy

配置keepalived

直接在模板文件基础上修改配置

master节点配置文件

root@k8s-haproxy-01:~# cp /usr/share/doc/keepalived/samples/keepalived.conf.vrrp /etc/keepalived/keepalived.conf
root@k8s-haproxy-01:~# vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived

global_defs {
   notification_email {
     acassen
   }
   notification_email_from Alexandre.Cassen@firewall.loc
   smtp_server 192.168.200.1
   smtp_connect_timeout 30
   router_id LVS_10
}

vrrp_instance VI_1 {
    state MASTER
    interface ens33
    garp_master_delay 10
    smtp_alert
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
       172.31.3.150 dev ens33 label ens33:0
       172.31.3.151 dev ens33 label ens33:1
       172.31.3.152 dev ens33 label ens33:2
       172.31.3.153 dev ens33 label ens33:3
       172.31.3.154 dev ens33 label ens33:4
    }
}

backup节点配置文件

root@k8s-haproxy-02:~# vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived

global_defs {
   notification_email {
     acassen
   }
   notification_email_from Alexandre.Cassen@firewall.loc
   smtp_server 192.168.200.1
   smtp_connect_timeout 30
   router_id LVS_11
}

vrrp_instance VI_1 {
    state BACKUP
    interface ens33
    garp_master_delay 10
    smtp_alert
    virtual_router_id 51
    priority 50
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
       172.31.3.150 dev ens33 label ens33:0
       172.31.3.151 dev ens33 label ens33:1
       172.31.3.152 dev ens33 label ens33:2
       172.31.3.153 dev ens33 label ens33:3
       172.31.3.154 dev ens33 label ens33:4
    }
}

切换测试

配置haproxy

测试haproxy是否可以正常使用，本次连接一个nginx。

#两个节点添加配置
root@k8s-haproxy-01:~# vim /etc/haproxy/haproxy.cfg
listen haproxy-80
  bind 172.31.3.120:80
  mode tcp
  server server1 172.31.3.150:80 check inter 3s fall 3 rise 3