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一个功能一个模块，单一职责原则，（会有模块依赖） 核心模块,标准http模块,可选http模块，邮件模块，第三方模块. ####查看已安装的模块 ``` nginx -V nginx version: nginx/1.18.0 built by gcc 8.3.1 20190507 (Red Hat 8.3.1-4) (GCC) built with OpenSSL 1.1.1g 21 Apr 2020 TLS SNI support enabled configure arguments: --user=www --group=www --prefix=/www/server/nginx --add-module=srclib/ngx_devel_kit --add-module=srclib/lua_nginx_module --add-module=srclib/ngx_cache_purge --add-module=srclib/nginx-sticky-module --with-openssl=srclib/openssl --with-pcre=srclib/pcre-8.43 --with-http_v2_module --with-stream --with-stream_ssl_module --with-stream_ssl_preread_module --with-http_stub_status_module --with-http_ssl_module --with-http_image_filter_module --with-http_gzip_static_module --with-http_gunzip_module --with-ipv6 --with-http_sub_module --with-http_flv_module --with-http_addition_module --with-http_realip_module --with-http_mp4_module --with-ld-opt=-Wl,-E --with-cc-opt=-Wno-error --with-http_dav_module --add-module=srclib/nginx-dav-ext-module ```