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 根据指定的域名进行反向代理转发，实现负载均衡

Nginx的upstream支持如下六种方式的分配算法，分别是：

轮询 默认方式

weight 权重方式

ip_hash 依据ip分配方式

least_conn 依据最少连接方式

url_hash 依据URL分配方式

fair 依据响应时间方式

user   appuser;
worker_processes  64;
error_log  logs/error.log;pid        logs/nginx.pid;events {worker_connections  102400;use epoll;
}http {include       mime.types;default_type  application/octet-stream;log_format  main  '$remote_addr - $remote_user [$time_local] "$request" ''$status $body_bytes_sent "$http_referer" ''"$http_user_agent" "$http_x_forwarded_for"';access_log  logs/access.log  main;client_max_body_size 100m;sendfile       off;tcp_nopush     on;tcp_nodelay    on;#keepalive_timeout  0;keepalive_timeout  600;gzip  on;include /usr/local/nginx/conf.d/*.conf;upstream 127.0.0.1 {#weigth参数表示权值，权值越高被分配到的几率越大server 127.0.0.1:8310  weight=1;server 127.0.0.1:8311 weight=1;}server {listen       80;#已提供的域名server_name  test.login.com;return      301 https://$server_name$request_uri;#rewrite ^(.*)$ https://$host$1 permanent;access_log off;         location / {         proxy_pass http://127.0.0.1;proxy_redirect off;proxy_set_header X-Real-IP $remote_addr;proxy_set_header Referer $http_referer;proxy_set_header Host $host:$server_port;proxy_ignore_client_abort on;client_max_body_size 1000m;client_body_buffer_size 10240k;proxy_connect_timeout 300;proxy_send_timeout 300;proxy_read_timeout 300;proxy_buffer_size 4096k;proxy_buffers 24 4096k;proxy_busy_buffers_size 4096k;proxy_temp_file_write_size 4096k;add_header backendIp $upstream_addr;#proxy_redirect http:// $scheme://;}#error_page  404              /404.html;# redirect server error pages to the static page /50x.html#error_page   500 502 503 504  /50x.html;location = /50x.html {root   html;}}
}