lvs+keepalived集群架构

其他 2020-01-19 11:18:17 阅读次数: 0

LVS负载均衡高可用最优方案（LVS+Keepalived）
在这里插入图片描述
内部IP(eth0) 外部IP(eth1) 角色 备注
192.168.0.210 无 LVS负载均衡器（主） VIP：192.168.0.240
192.168.0.211 无 LVS负载均衡器（备） VIP：192.168.0.240
192.168.0.223 无 Web01节点
192.168.0.224 无 Web02节点
192.168.0.220 无 内网客户端
1.LVS负载均衡器主和备安装Keepalived软件

[root@lvs01 ~]# yum -y install keepalived   #光盘安装即可

仅实现LVS负载均衡器主和备的keepalived高可用功能
LVS负载均衡器主的keepalived配置文件内容如下

[

root@lvs01 ~]# sed -n '1,30p' /etc/keepalived/keepalived.conf 
! Configuration File for keepalived

global_defs {
   notification_email {
    [email protected]
   }
   notification_email_from yunjisuan
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id LVS01
}

vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 55
    priority 150
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
    192.168.0.240/24 dev eth0 label eth0:240
    }
}

LVS负载均衡器主的keepalived配置文件内容如下

[root@localhost ~]# sed -n '1,30p' /etc/keepalived/keepalived.conf 
! Configuration File for keepalived

global_defs {
   notification_email {
    [email protected]
   }
   notification_email_from yunjisuan
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id LVS02
}

vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    virtual_router_id 55
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
    192.168.0.240/24 dev eth0 label eth0:240
    }
}

1.1 添加LVS的负载均衡规则
以下操作过程，在LVS主和备上完全一样

[root@localhost ~]# ipvsadm -C
[root@localhost ~]# ipvsadm -A -t 192.168.0.240:80 -s rr
[root@localhost ~]# ipvsadm -a -t 192.168.0.240:80 -r 192.168.0.223:80 -g -w 1
[root@localhost ~]# ipvsadm -a -t 192.168.0.240:80 -r 192.168.0.224:80 -g -w 1
[root@localhost ~]# ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  192.168.0.240:80 rr persistent 20
  -> 192.168.0.223:80             Route   1      0          0         
  -> 192.168.0.224:80             Route   1      0          0

1.2启动LVS主和备的keepalived服务
#在LVS主上

[root@lvs01 ~]# /etc/init.d/keepalived start
[root@lvs01 ~]# ifconfig 
eth0      Link encap:Ethernet  HWaddr 00:0C:29:D5:7F:9D  
          inet addr:192.168.0.210  Bcast:192.168.0.255  Mask:255.255.255.0
          inet6 addr: fe80::20c:29ff:fed5:7f9d/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:23567 errors:0 dropped:0 overruns:0 frame:0
          TX packets:14635 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:2008524 (1.9 MiB)  TX bytes:1746298 (1.6 MiB)

eth0:240  Link encap:Ethernet  HWaddr 00:0C:29:D5:7F:9D  
          inet addr:192.168.0.240  Bcast:0.0.0.0  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:769 errors:0 dropped:0 overruns:0 frame:0
          TX packets:769 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:56636 (55.3 KiB)  TX bytes:56636 (55.3 KiB)

#在LVS副上

[root@localhost ~]# /etc/init.d/keepalived start
[root@localhost ~]# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:0C:29:E7:06:1D  
          inet addr:192.168.0.211  Bcast:192.168.0.255  Mask:255.255.255.0
          inet6 addr: fe80::20c:29ff:fee7:61d/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:14109 errors:0 dropped:0 overruns:0 frame:0
          TX packets:4902 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:12683754 (12.0 MiB)  TX bytes:553207 (540.2 KiB)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:155 errors:0 dropped:0 overruns:0 frame:0
          TX packets:155 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:11283 (11.0 KiB)  TX bytes:11283 (11.0 KiB)

#如果LVS副上没有VIP就对了。如果主副都有，那么请检查防火墙是否开启状态
1.3内网客户端进行访问测试
#在内网客户端上进行访问测试

[root@LanClient ~]# curl 192.168.0.240
192.168.0.224 bbs
[root@LanClient ~]# curl 192.168.0.240
192.168.0.223 bbs
[root@LanClient ~]# curl 192.168.0.240
192.168.0.224 bbs
[root@LanClient ~]# curl 192.168.0.240
192.168.0.223 bbs
[root@LanClient ~]# curl 192.168.0.240
192.168.0.224 bbs
[root@LanClient ~]# curl 192.168.0.240
192.168.0.223 bbs
[root@LanClient ~]# curl 192.168.0.240
192.168.0.224 bbs

#在LVS主上进行访问连接查询

[root@lvs01 ~]# ipvsadm -Lnc
IPVS connection entries
pro expire state       source             virtual            destination
TCP 00:01  FIN_WAIT    192.168.0.220:59887 192.168.0.240:80   192.168.0.223:80
TCP 00:01  FIN_WAIT    192.168.0.220:59889 192.168.0.240:80   192.168.0.223:80
TCP 00:01  FIN_WAIT    192.168.0.220:59888 192.168.0.240:80   192.168.0.224:80
TCP 00:00  FIN_WAIT    192.168.0.220:59886 192.168.0.240:80   192.168.0.224:80

#在LVS主上停掉keepalived服务

[root@lvs01 ~]# /etc/init.d/keepalived stop
Stopping keepalived:                                       [  OK  ]
[root@lvs01 ~]# ifconfig | grep eth0:240

#在LVS副上查看VIP

[root@localhost ~]# ip a | grep eth0:240
    inet 192.168.0.240/24 scope global secondary eth0:240

#再次在内网客户端上进行访问测试

[root@LanClient ~]# curl 192.168.0.240
192.168.0.223 bbs
[root@LanClient ~]# curl 192.168.0.240
192.168.0.224 bbs
[root@LanClient ~]# curl 192.168.0.240
192.168.0.223 bbs
[root@LanClient ~]# curl 192.168.0.240
192.168.0.224 bbs
[root@LanClient ~]# curl 192.168.0.240
192.168.0.223 bbs

#在LVS副上进行访问连接查询

[root@localhost ~]# ipvsadm -Lnc
IPVS connection entries
pro expire state       source             virtual            destination
TCP 01:47  FIN_WAIT    192.168.0.220:59900 192.168.0.240:80   192.168.0.223:80
TCP 01:09  FIN_WAIT    192.168.0.220:59891 192.168.0.240:80   192.168.0.224:80
TCP 01:48  FIN_WAIT    192.168.0.220:59902 192.168.0.240:80   192.168.0.223:80
TCP 01:09  FIN_WAIT    192.168.0.220:59892 192.168.0.240:80   192.168.0.224:80
TCP 01:14  FIN_WAIT    192.168.0.220:59896 192.168.0.240:80   192.168.0.224:80
TCP 01:10  FIN_WAIT    192.168.0.220:59894 192.168.0.240:80   192.168.0.224:80

#开启LVS主上的keepalived服务

[root@lvs01 ~]# /etc/init.d/keepalived start
[root@lvs01 ~]# ip a | grep eth0:240
    inet 192.168.0.240/24 scope global secondary eth0:240

#查看LVS副上VIP资源是否释放

[root@localhost ~]# ip a | grep eth0:240
[root@localhost ~]#

综上，至此基于LVS的keepalived高可用功能实验完毕

1.4通过Keepalived对LVS进行管理的功能实现

[root@lvs01 ~]# cat /etc/keepalived/keepalived.conf 
! Configuration File for keepalived

global_defs {
   notification_email {
    [email protected]
   }
   notification_email_from yunjisuan
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id LVS01
}

vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 55
    priority 150
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
    192.168.0.240/24 dev eth0 label eth0:240
    }
}

virtual_server 192.168.0.240 80 {       #虚拟主机VIP
    delay_loop 6            #
    lb_algo rr              #算法
    lb_kind DR              #模式
    nat_mask 255.255.255.0  #掩码
#    persistence_timeout 50 #会话保持
    protocol TCP            #协议

    real_server 192.168.0.223 80 {      #RS节点
        weight 1                #权重
        TCP_CHECK {             #节点健康检查
        connect_timeout 8       #延迟超时时间
        nb_get_retry 3          #重试次数
        delay_before_retry 3    #延迟重试次数
        connect_port 80         #利用80端口检查
    }
    }
    real_server 192.168.0.224 80 {      #RS节点
        weight 1
        TCP_CHECK {
        connect_timeout 8
        nb_get_retry 3
        delay_before_retry 3
        connect_port 80 
    }
    }
}

以上keepalived配置文件在LVS主和备上都进行修改。
然后在lvs服务器上通过ipvsadm -C清除之前设置的规则
重新启动keepalived服务进行测试，操作过程如下：

[root@lvs01 ~]# /etc/init.d/keepalived stop             #关闭主LVS的keepalived服务
Stopping keepalived:                                       [  OK  ]
[root@lvs01 ~]# ipvsadm -Ln                             #没有ipvs规则
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
[root@lvs01 ~]# ip a | grep 240                         #没有VIP
[root@lvs01 ~]# /etc/init.d/keepalived start            #启动keepalived服务
Starting keepalived:                                       [  OK  ]
[root@lvs01 ~]# ipvsadm -Ln                             #出现ipvs规则
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  192.168.0.240:80 rr
  -> 192.168.0.223:80             Route   1      0          0         
  -> 192.168.0.224:80             Route   1      0          0         
[root@lvs01 ~]# ip a | grep 240                         #出现VIP
    inet 192.168.0.240/24 scope global secondary eth0:240
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