linux覆盤：linux+keepalived+lvs+tomcat雙端口負載均衡方案

先來感覺一下若是分開提供服務，不作反向代理的keepalived配置文件：（ps這樣配置多不要驚慌）

vim /etc/keepalived/keepalived.conf
vrrp_instance VI_1 {
    state BACKUP
    interface ens192
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass password
    }
    virtual_ipaddress {
        192.168.14.13
    }
}
virtual_server 192.168.14.13 80 {
    delay_loop 10
    lb_algo wlc
    lb_kind DR
    persistence_timeout 180
    protocol TCP
    real_server 192.168.14.127 80 {
        weight 100
        TCP_CHECK {
        connect_timeout 10
        nb_get_retry 3
        delay_before_retry 3
        connect_port 80
        }
    }
    real_server 192.168.14.128 80 {
        weight 100
        TCP_CHECK {
        connect_timeout 10
        nb_get_retry 3
        delay_before_retry 3
        connect_port 80
        }
     }
     real_server 192.168.14.129 80 {
         weight 100
         TCP_CHECK {
         connect_timeout 10
         nb_get_retry 3
         delay_before_retry 3
         connect_port 80
         }
      }
}
virtual_server 192.168.14.13 8080 {
    delay_loop 10
    lb_algo wlc
    lb_kind DR
    persistence_timeout 180
    protocol TCP
    real_server 192.168.14.127 8080 {
        weight 100
        TCP_CHECK {
        connect_timeout 10
        nb_get_retry 3
        delay_before_retry 3
        connect_port 80
        }
    }
    real_server 192.168.14.128 8080 {
        weight 100
        TCP_CHECK {
        connect_timeout 10
        nb_get_retry 3
        delay_before_retry 3
        connect_port 80
        }
     }
     real_server 192.168.14.129 8080 {
         weight 100
         TCP_CHECK {
         connect_timeout 10
         nb_get_retry 3
         delay_before_retry 3
         connect_port 80
         }
      }
}

好了解釋一下，這裏不止給80端口作了負載均衡，後面加入了8080端口的負載均衡，確定不提倡這麼作，可是若是作了別忘了機器2的state改成BACKUP，priority設爲90

如今講負載均衡應用場景：

Keepalived+LVS高可+負載均衡集羣架構中rs同時跑httpd（80端口）和Java（8080端口）服務，使用Keepalived負載均衡多個端口。 若是想所有由80端口提供服務，則Keepalived+LVS負載均衡層就只開啓80端口，內部節點使用nginx代理8080端口，那麼先作反向代理8080。

nginx反向代理Tomcat

#在rs上建立nginx代理虛擬主機，名爲zrlog.conf，而後配置內容以下：

vim /usr/local/nginx/conf/vhosts/zrlog.conf
server {
    listen 80;
    server_name www.3zuzrlog.com; #定義域名（通常和被代理ip的域名保持一致）

location / {
    proxy_pass http://localhost:8080; #指定被代理（被訪問）的IP（web服務器IP）
    proxy_redirect default;
    proxy_set_header Host   $host; #$host指的是代理服務器的servername（也是被代理IP的域名）
    proxy_set_header X-Real-IP      $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }

#說明： 由於該虛擬主機只用做代理服務器，不須要訪問本地文件，因此不須要設置根目錄。

好了，此時Keepalived+LVS只需監聽80端口便可：

vim /etc/keepalived/keepalived.conf
vrrp_instance VI_1 {
    state BACKUP
    interface ens192
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass password
    }
    virtual_ipaddress {
        192.168.14.13
    }
}
virtual_server 192.168.14.13 80 {
    delay_loop 10
    lb_algo wlc
    lb_kind DR
    persistence_timeout 180
    protocol TCP
    real_server 192.168.14.127 80 {
        weight 100
        TCP_CHECK {
        connect_timeout 10
        nb_get_retry 3
        delay_before_retry 3
        connect_port 80
        }
    }
    real_server 192.168.14.128 80 {
        weight 100
        TCP_CHECK {
        connect_timeout 10
        nb_get_retry 3
        delay_before_retry 3
        connect_port 80
        }
     }
     real_server 192.168.14.129 80 {
         weight 100
         TCP_CHECK {
         connect_timeout 10
         nb_get_retry 3
         delay_before_retry 3
         connect_port 80
         }
      }
}