使用KeepAlive实现将lvs进行高可用

 

配置keepalived：

1、使用DR模式：

环境说明：

192.168.2.205  node1.sky.com  keepalived+lvs 服务器  DIP

192.168.2.206  node2.sky.com  keepalived+lvs 服务器  DIP

192.168.2.220  lvs VIP

192.168.2.207  web1.sky.com  apache服务器

192.168.2.208  web2.sky.com  apache服务器

192.168.2.100  window客户端

首先进行时间同步

配置说明：

global_defs {
   notification_email {
      [email protected]
   }
   notification_email_from [email protected]
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id node1.sky.com
   vrrp_mcast_group4 224.0.0.28
}


vrrp_script chk_mantaince_down {
   script "[[ -f /etc/keepalived/down ]] && exit 1 || exit 0"
   interval 1
   weight -20
}

vrrp_instance lvs {
    state MASTER
    interface eth0
    virtual_router_id 51
    track_interface {
        eth0 weight 5
        eth1 weight -20
    }
    priority 110
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.2.220/32 dev eth0 label eth0:0
    }
    track_script {  
        chk_mantaince_down
    }  
  notify_backup "/usr/local/keepalived/bin/show.sh http backup"
  notify_master "/usr/local/keepalived/bin/show.sh http master"
  notify_fault "/usr/local/keepalived/bin/show.sh http fault"
  smtp_alert
}

virtual_server 192.168.2.220 80 {
    delay_loop 3
    lb_algo rr
    lb_kind DR
    persistence_timeout 10
    protocol TCP

    real_server 192.168.2.207 80 {
        weight 1
        HTTP_GET {
            url {
              path /status
              status_code 200
            }
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }

    real_server 192.168.2.208 80 {
        weight 1
        HTTP_GET {
            url {
              path /status
              status_code 200
            }
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }

}

如果后端的httpd服务监控端口是8080，可以在web服务器上用 iptables进行端口转发

iptables -t nat -A PREROUTING -p tcp --dport 80 -j DNAT --to-destination :8080

2、使用nat模式

环境说明：

192.168.2.205  node1.sky.com  keepalived+lvs 服务器  DIP

192.168.2.206  node2.sky.com  keepalived+lvs 服务器  DIP

192.168.2.220  lvs VIP

192.168.2.207(管理IP)    172.16.2.207 (VIP)   web1.sky.com  apache服务器

192.168.2.208(管理IP)    172.16.2.208 (VIP)   web2.sky.com  apache服务器

192.168.2.100  window客户端

配置说明：

global_defs {
   notification_email {
      [email protected]
   }
   notification_email_from [email protected]
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id node1.sky.com
   vrrp_mcast_group4 224.0.0.28
}


vrrp_script chk_mantaince_down {
   script "[[ -f /etc/keepalived/down ]] && exit 1 || exit 0"
   interval 1
   weight -20
}

vrrp_instance lvs {
    state MASTER
    interface eth0
    virtual_router_id 51
    track_interface {
        eth0 weight 5
        eth1 weight -20
    }
    priority 110
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.2.220/24 brd 192.168.2.255 dev eth0 label eth0:0
        172.16.2.220/24 brd 172.16.2.255 dev eth1 label eth1:0
    }
    track_script {  
        chk_mantaince_down
    }  
  notify_backup "/usr/local/keepalived/bin/show.sh http backup"
  notify_master "/usr/local/keepalived/bin/show.sh http master"
  notify_fault "/usr/local/keepalived/bin/show.sh http fault"
  smtp_alert
}

virtual_server 192.168.2.220 80 {
    delay_loop 3
    lb_algo rr
    lb_kind NAT
    persistence_timeout 10
    nat
    protocol TCP

    real_server 172.16.2.207 8080 {
        weight 1
        HTTP_GET {
            url {
              path /status
              status_code 200
            }
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }

    real_server 172.16.2.208 8080 {
        weight 1
        HTTP_GET {
            url {
              path /status
              status_code 200
            }
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }

}

注意：

1、二台lvs服务器开启端口转发

2、二台web服务器网关指向172.16.2.220

echo "101 rip" >> /etc/iproute2/rt_tables

ip route add default via 172.16.2.220 dev eth1 tablerip

ip rule add from 172.16.2.207(208) table rip