2020-02-23

[root@lb01 conf]# ip addr add 10.0.0.3/24 dev eth0 label eth0:0
[root@lb01 conf]# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:0C:29:75:2B:E9  
          inet addr:10.0.0.5  Bcast:10.0.0.255  Mask:255.255.255.0
          inet6 addr: fe80::20c:29ff:fe75:2be9/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:21728 errors:0 dropped:0 overruns:0 frame:0
          TX packets:11923 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:16542534 (15.7 MiB)  TX bytes:1614430 (1.5 MiB)

eth0:0    Link encap:Ethernet  HWaddr 00:0C:29:75:2B:E9  
          inet addr:10.0.0.3  Bcast:0.0.0.0  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
...

[root@lb01 conf]# vim nginx.conf
worker_processes  1;
events {
    worker_connections  1024;
worker_processes  1;
events {
    worker_connections  1024;
}
    http {
        include       mime.types;
        default_type  application/octet-stream;
        sendfile        on;
        keepalive_timeout  65;
    
    upstream server_pools {
        server 10.0.0.7:80  weight=1;
        server 10.0.0.8:80  weight=1;
    }   
    server {
        listen       80;
        server_name  bbs.etiantian.org;
        location / { 
           proxy_pass http://server_pools;
           proxy_set_header Host $host;
           proxy_set_header X-Forwarded-For $remote_addr;
    }      
}


    server {
        listen       80;
        server_name  blog.etiantian.org;
        location / { 
           proxy_pass http://server_pools;
           proxy_set_header Host $host;
"nginx.conf" 35L, 836C written                                                                                                                                                                                                               
[root@lb01 conf]# ../sbin/nginx -t
nginx: the configuration file /application/nginx-1.6.3/conf/nginx.conf syntax is ok
nginx: configuration file /application/nginx-1.6.3/conf/nginx.conf test is successful
[root@lb01 conf]# ../sbin/nginx -s reload
nginx: [error] invalid PID number "" in "/application/nginx-1.6.3/logs/nginx.pid"
[root@lb01 conf]# ../sbin/nginx 
[root@lb01 conf]# 

正在 Ping www.etiantian.org [10.0.0.3] 具有 32 字节的数据:
来自 10.0.0.3 的回复: 字节=32 时间<1ms TTL=64
来自 10.0.0.3 的回复: 字节=32 时间<1ms TTL=64
来自 10.0.0.3 的回复: 字节=32 时间<1ms TTL=64
来自 10.0.0.3 的回复: 字节=32 时间<1ms TTL=64

配置统一，lb02 /application/nginx-1.6.3/conf/nginx.conf

worker_processes  1;
events {
    worker_connections  1024;
}
    http {
        include       mime.types;
        default_type  application/octet-stream;
        sendfile        on;
        keepalive_timeout  65;
    
    upstream server_pools {
        server 10.0.0.7:80  weight=1;
        server 10.0.0.8:80  weight=1;
    }
    server {
        listen       80;
        server_name  bbs.etiantian.org;
        location / {
           proxy_pass http://server_pools;
           proxy_set_header Host $host;
           proxy_set_header X-Forwarded-For $remote_addr;
    }
}


    server {
        listen       80;
        server_name  blog.etiantian.org;
        location / {
           proxy_pass http://server_pools;
           proxy_set_header Host $host;
           proxy_set_header X-Forwarded-For $remote_addr;
      }
    }
}

[root@lb02 ~]# /application/nginx/sbin/nginx -t      
nginx: the configuration file /application/nginx-1.6.3/conf/nginx.conf syntax is ok
nginx: configuration file /application/nginx-1.6.3/conf/nginx.conf test is successful
[root@lb02 ~]# /application/nginx/sbin/nginx -s reload
[root@lb02 ~]# 

如果5宕机（暂停），刷新页面无法打开

[root@lb02 ~]# ip addr add 10.0.0.3/24 dev eth0 label eth0:0
[root@lb02 ~]# 

此时刷新，可以显示
关掉lb02

[root@lb02 ~]# pkill nginx
[root@lb02 ~]# 

页面无法显示。