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LVS和nginx的测试

实验DR模式

LVS四层代理

test----lvs vip—nginx1/ngin2

LVS服务器的配置

[root@lvs openresty-1.17.8.2]# ipvsadm -ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  192.168.137.99:80 rr
  -> 192.168.137.101:80           Route   1      0          4994      
  -> 192.168.137.102:80           Route   1      0          5030
[root@lvs openresty-1.17.8.2]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    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: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 08:00:27:9a:2c:4d brd ff:ff:ff:ff:ff:ff
    inet 192.168.137.100/24 brd 192.168.137.255 scope global noprefixroute enp0s3
       valid_lft forever preferred_lft forever
    inet 192.168.137.99/24 brd 192.168.137.255 scope global secondary noprefixroute enp0s3:0
       valid_lft forever preferred_lft forever
    inet6 fe80::9740:e62:24b0:b04d/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever

测试

在test服务器上测试，访问均匀的分布在 两个rip上

for i in {1…3000};do curl http://192.168.137.99;done

在nginx服务器上查看日志，发现日志中remoteip 是client的ip。

结论

1、在lvs rr算法下，不设置-p参数的话，请求能均匀的分布在两台服务器上。

2、lvs的dr模式，后端nginx获取的remote_ip不是lvs代理服务器的IP。是直接client过来的IP。

3、后端直接给客户端回包。不经过代理，后端与代理也没有链接

nginx七层代理

test----lvs nginx8080—nginx1/ngin2

LVS服务器上的nginx的配置

http {
    include       mime.types;
    default_type  application/octet-stream;
    sendfile        on;
    keepalive_timeout  65;
    upstream nginx{ 
       server 192.168.137.101 weight=100 max_fails=2 fail_timeout=30s;
       server 192.168.137.102 weight=100 max_fails=2 fail_timeout=30s;
             }
    server {
        listen       8080;
        server_name  localhost;
        ##让代理设置请求头，传递之前的IP
        proxy_set_header Host $http_host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header REMOTE-HOST $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        
        location / {
        proxy_pass http://nginx;
        }

        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }
    }

}

后端nginx配置

#nginx1配置，设置上realip模块，记录真实IP
 server {
        listen       80;
        server_name  localhost;
        set_real_ip_from 192.168.137.100;  #表示来自代理服务器的IP，不是用户的真实IP
        real_ip_header X-Forwarded-For;   #用户真实IP存在X-Forwarded-For请求头中
        real_ip_recursive on;
        location / {
            root   html;
            index  index.html index.htm;
        }
        }

#nginx2，不设置realip模块，记录真实IP
 server {
        listen       80;
        server_name  localhost;
        
        location / {
            root   html;
            index  index.html index.htm;
        }
        }

测试

在test服务器上测试

for i in {1…3000};do curl http://192.168.137.99:8080/;done

for i in {1…3000};do curl http://192.168.137.100:8080/;done

观察日志中的remote_ip和http_x_forwarded_for

观察两后台nginx的建立的链接

观察测试服务器的链接

结论

1、nginx七层代理的请求均匀的打在了两台机器上

2、用户访问nginx代理，后端实际与代理进行通讯。流量从代理来，走代理出去。不同于lvs的DR模式

3、nginx的七层代理可以通过xff设置IP透传。代理的ip记录在http_x_forwarded_for中。可通过realip模块将clientIP过滤出来，通过remote_ip打印

nginx四层代理

test----lvs nginx8081—nginx1/ngin2

LVS服务器上nginx的配置

stream {
   upstream web{
      server 192.168.137.101:80 weight=100 max_fails=2 fail_timeout=30s;
      server 192.168.137.102:80 weight=100 max_fails=2 fail_timeout=30s;
               }
        server {
                listen 8081;
                proxy_pass web;
        }
}

测试
观察后端nginx日志

观察后端服务器socket链接

结论

1、nginx四层代理不能透传IP

2、和7层一样流量经过代理出去。类似lvs的nat模式

keepalive四层

test----nginx1（keepalive vip dr）—nginx1/ngin2

这次在服务器nginx1和nginx2上部署的keepalive nginx1做keepalive的主

keepalived主配置

global_defs {
   router_id nginx1
}
vrrp_instance VI_1 {
    state MASTER
    interface enp0s3
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.137.103
    }
}
virtual_server 192.168.137.103 80 {
    delay_loop 3
    lb_algo rr
    lb_kind DR
    ###persistence_timeout 0
    protocol TCP
    real_server 192.168.137.101 80 {
        weight 1
        TCP_CHECK{
        connect_timeout 3
        retry 3
        delay_before_retry 3
        }
       }
    real_server 192.168.137.102 80 {
        weight 1
        TCP_CHECK{
        connect_timeout 3
        retry 3
        delay_before_retry 3
        }

    }
}

keepalived备配置

##keepalived配置
global_defs {
   router_id nginx2
}

vrrp_instance VI_1 {
    state BACKUP
    interface enp0s3
    virtual_router_id 51
    priority 50
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.137.103
    }
}

virtual_server 192.168.137.103 80 {
    delay_loop 3
    lb_algo rr
    lb_kind DR
    ###persistence_timeout 0
    protocol TCP
#此处需要把这个到nginx1的转发注释掉，否则转发会死循环
   # real_server 192.168.137.101 80 {
    #    weight 1
   #     TCP_CHECK{
  #      connect_timeout 3
 #       retry 3
#        delay_before_retry 3
 #       }
 #      }
    real_server 192.168.137.102 80 {
        weight 1
        TCP_CHECK{
        connect_timeout 3
        retry 3
        delay_before_retry 3
        }

    }
}

#路由和ip配置
 ip addr add 192.168.137.103/32  dev lo label lo:2
 route add -host 192.168.137.103 dev lo:2

结论

1、后台realserver需要抑制IP和设置路由

2、备机上的转发规则不能往主机转，否则死循环。因此把备机上的规则只要指向自己。

3、DR模式直接给客户端回包，不需要再经过代理服务器