Nginx是什么？
    Nginx (engine x) 是一个高性能的HTTP和反向代理web服务器，同时也提供了IMAP/POP3/SMTP服务。
    Nginx配置文件

    1. #user  nobody;
    2. worker_processes  1; #worker进程的数量
    3. #error_log  logs/error.log;
    4. #error_log  logs/error.log  notice;
    5. #error_log  logs/error.log  info;
    6. #pid        logs/nginx.pid;
    7. events {                         #事件区块
    8. worker_connections  1024; #每个worker进程支持最大的连接数量
    9. }
    10. http {                                        #http区块
    11. include       mime.types;    #Nginx支持的媒体库文件
    12. default_type  application/octet-stream; #默认的媒体类型
    13. #log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
    14. #                  '$status $body_bytes_sent "$http_referer" '
    15. #                  '"$http_user_agent" "$http_x_forwarded_for"';
    17. #access_log  logs/access.log  main;
    19. sendfile        on; #开启传输模式
    20. #tcp_nopush     on;
    22. #keepalive_timeout  0;
    23. keepalive_timeout  65; #连接超时事件
    25. #gzip  on;
    26. #监听端口
    27. upstream AspNetCore31{                     #上游服务器设置，主要为反向代理、负载均衡相关配置
    28.       server  localhost:5726;        
    29.       server  localhost:5727;
    30.       server  localhost:5728;
    31. }
    32. server {                                                #第一个server区块，表示一个独立的虚拟主机站点
    33.     listen       8080;           #Nginx监听端口
    34.     server_name  localhost;            #服务器名称或域名
    36.     #charset koi8-r;
    38.     #access_log  logs/host.access.log  main;
    40.     location / {
    41.        proxy_pass   http://AspNetCore31;
    42.     }
    44.     #error_page  404              /404.html;
    46.     # redirect server error pages to the static page /50x.html
    47.     #
    48.     error_page   500 502 503 504  /50x.html;
    49.     location = /50x.html {
    50.         root   html;
    51.     }
    53.     # proxy the PHP scripts to Apache listening on 127.0.0.1:80
    54.     #
    55.     #location ~ \.php$ {
    56.     #    proxy_pass   http://127.0.0.1;
    57.     #}
    59.     # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
    60.     #
    61.     #location ~ \.php$ {
    62.     #    root           html;
    63.     #    fastcgi_pass   127.0.0.1:9000;
    64.     #    fastcgi_index  index.php;
    65.     #    fastcgi_param  SCRIPT_FILENAME  /scripts$fastcgi_script_name;
    66.     #    include        fastcgi_params;
    67.     #}
    69.     # deny access to .htaccess files, if Apache's document root
    70.     # concurs with nginx's one
    71.     #
    72.     #location ~ /\.ht {
    73.     #    deny  all;
    74.     #}
    75. }
    78. # another virtual host using mix of IP-, name-, and port-based configuration
    79. #
    80. #server {
    81. #    listen       8000;
    82. #    listen       somename:8080;
    83. #    server_name  somename  alias  another.alias;
    85. #    location / {
    86. #        root   html;
    87. #        index  index.html index.htm;
    88. #    }
    89. #}
    92. # HTTPS server
    93. #
    94. #server {
    95. #    listen       443 ssl;
    96. #    server_name  localhost;
    98. #    ssl_certificate      cert.pem;
    99. #    ssl_certificate_key  cert.key;
    101. #    ssl_session_cache    shared:SSL:1m;
    102. #    ssl_session_timeout  5m;
    104. #    ssl_ciphers  HIGH:!aNULL:!MD5;
    105. #    ssl_prefer_server_ciphers  on;
    107. #    location / {
    108. #        root   html;
    109. #        index  index.html index.htm;
    110. #    }
    111. #}

    }
    Nginx负载均衡策略
    1、轮询策略
    2、权重策略
    3、Ip_Hash策略
    4、Url_Hash策略