{"id":191748,"date":"2022-04-28T07:26:08","date_gmt":"2022-04-27T23:26:08","guid":{"rendered":"https:\/\/www.idc.net\/help\/191748\/"},"modified":"2022-04-28T07:26:08","modified_gmt":"2022-04-27T23:26:08","slug":"%e5%90%8e%e6%b5%aa%e4%ba%91nginx%e6%95%99%e7%a8%8b%ef%bc%9anginx-upstream-%e6%a8%a1%e5%9d%97%e7%ae%80%e4%bb%8b","status":"publish","type":"post","link":"https:\/\/idc.net\/help\/191748\/","title":{"rendered":"\u540e\u6d6a\u4e91Nginx\u6559\u7a0b\uff1aNginx upstream \u6a21\u5757\u7b80\u4ecb"},"content":{"rendered":"

upstream \u6a21\u5757\u7b80\u4ecb<\/h2>\n

Nginx \u6a21\u5757\u4e00\u822c\u88ab\u5206\u6210\u4e09\u5927\u7c7b\uff1ahandler\u3001filter \u548c upstream\u3002\u524d\u9762\u7684\u7ae0\u8282\u4e2d\uff0c\u8bfb\u8005\u5df2\u7ecf\u4e86\u89e3\u4e86 handler\u3001filter\u3002\u5229\u7528\u8fd9\u4e24\u7c7b\u6a21\u5757\uff0c\u53ef\u4ee5\u4f7f Nginx \u8f7b\u677e\u5b8c\u6210\u4efb\u4f55\u5355\u673a\u5de5\u4f5c\u3002\u800c\u672c\u7ae0\u4ecb\u7ecd\u7684 upstream \u6a21\u5757\uff0c\u5c06\u4f7f Nginx \u8de8\u8d8a\u5355\u673a\u7684\u9650\u5236\uff0c\u5b8c\u6210\u7f51\u7edc\u6570\u636e\u7684\u63a5\u6536\u3001\u5904\u7406\u548c\u8f6c\u53d1\u3002<\/p>\n

\u6570\u636e\u8f6c\u53d1\u529f\u80fd\uff0c\u4e3a Nginx \u63d0\u4f9b\u4e86\u8de8\u8d8a\u5355\u673a\u7684\u6a2a\u5411\u5904\u7406\u80fd\u529b\uff0c\u4f7f Nginx \u6446\u8131\u53ea\u80fd\u4e3a\u7ec8\u7aef\u8282\u70b9\u63d0\u4f9b\u5355\u4e00\u529f\u80fd\u7684\u9650\u5236\uff0c\u800c\u4f7f\u5b83\u5177\u5907\u4e86\u7f51\u8def\u5e94\u7528\u7ea7\u522b\u7684\u62c6\u5206\u3001\u5c01\u88c5\u548c\u6574\u5408\u7684\u6218\u7565\u529f\u80fd\u3002\u5728\u4e91\u6a21\u578b\u5927\u884c\u5176\u9053\u7684\u4eca\u5929\uff0c\u6570\u636e\u8f6c\u53d1\u662f Nginx \u6709\u80fd\u529b\u6784\u5efa\u4e00\u4e2a\u7f51\u7edc\u5e94\u7528\u7684\u5173\u952e\u7ec4\u4ef6\u3002\u5f53\u7136\uff0c\u9274\u4e8e\u5f00\u53d1\u6210\u672c\u7684\u95ee\u9898\uff0c\u4e00\u4e2a\u7f51\u7edc\u5e94\u7528\u7684\u5173\u952e\u7ec4\u4ef6\u4e00\u5f00\u59cb\u5f80\u5f80\u4f1a\u91c7\u7528\u9ad8\u7ea7\u7f16\u7a0b\u8bed\u8a00\u5f00\u53d1\u3002\u4f46\u662f\u5f53\u7cfb\u7edf\u5230\u8fbe\u4e00\u5b9a\u89c4\u6a21\uff0c\u5e76\u4e14\u9700\u8981\u66f4\u91cd\u89c6\u6027\u80fd\u7684\u65f6\u5019\uff0c\u4e3a\u4e86\u8fbe\u5230\u6240\u8981\u6c42\u7684\u6027\u80fd\u76ee\u6807\uff0c\u9ad8\u7ea7\u8bed\u8a00\u5f00\u53d1\u51fa\u7684\u7ec4\u4ef6\u5fc5\u987b\u8fdb\u884c\u7ed3\u6784\u5316\u4fee\u6539\u3002\u6b64\u65f6\uff0c\u5bf9\u4e8e\u4fee\u6539\u4ee3\u4ef7\u800c\u8a00\uff0cNginx \u7684 upstream \u6a21\u5757\u5448\u73b0\u51fa\u6781\u5927\u7684\u5438\u5f15\u529b\uff0c\u56e0\u4e3a\u5b83\u5929\u751f\u5c31\u5feb\u3002\u4f5c\u4e3a\u9644\u5e26\uff0cNginx \u7684\u914d\u7f6e\u7cfb\u7edf\u63d0\u4f9b\u7684\u5c42\u6b21\u5316\u548c\u677e\u8026\u5408\u4f7f\u5f97\u7cfb\u7edf\u7684\u6269\u5c55\u6027\u4e5f\u8fbe\u5230\u6bd4\u8f83\u9ad8\u7684\u7a0b\u5ea6\u3002<\/p>\n

\u8a00\u5f52\u6b63\u4f20\uff0c\u4e0b\u9762\u4ecb\u7ecd upstream \u7684\u5199\u6cd5\u3002<\/p>\n

upstream \u6a21\u5757\u63a5\u53e3<\/h2>\n

\u4ece\u672c\u8d28\u4e0a\u8bf4\uff0cupstream \u5c5e\u4e8e handler\uff0c\u53ea\u662f\u4ed6\u4e0d\u4ea7\u751f\u81ea\u5df1\u7684\u5185\u5bb9\uff0c\u800c\u662f\u901a\u8fc7\u8bf7\u6c42\u540e\u7aef\u670d\u52a1\u5668\u5f97\u5230\u5185\u5bb9\uff0c\u6240\u4ee5\u624d\u79f0\u4e3a upstream\uff08\u4e0a\u6e38\uff09\u3002\u8bf7\u6c42\u5e76\u53d6\u5f97\u54cd\u5e94\u5185\u5bb9\u7684\u6574\u4e2a\u8fc7\u7a0b\u5df2\u7ecf\u88ab\u5c01\u88c5\u5230 Nginx \u5185\u90e8\uff0c\u6240\u4ee5 upstream \u6a21\u5757\u53ea\u9700\u8981\u5f00\u53d1\u82e5\u5e72\u56de\u8c03\u51fd\u6570\uff0c\u5b8c\u6210\u6784\u9020\u8bf7\u6c42\u548c\u89e3\u6790\u54cd\u5e94\u7b49\u5177\u4f53\u7684\u5de5\u4f5c\u3002<\/p>\n

\u8fd9\u4e9b\u56de\u8c03\u51fd\u6570\u5982\u4e0b\u8868\u6240\u793a\uff1a<\/p>\n\n\n\n\n\n\n\n\n\n\n\n
SN<\/th>\n\u63cf\u8ff0<\/th>\n<\/tr>\n<\/thead>\n
create_request<\/td>\n\u751f\u6210\u53d1\u9001\u5230\u540e\u7aef\u670d\u52a1\u5668\u7684\u8bf7\u6c42\u7f13\u51b2\uff08\u7f13\u51b2\u94fe\uff09\uff0c\u5728\u521d\u59cb\u5316 upstream \u65f6\u4f7f\u7528\u3002<\/td>\n<\/tr>\n
reinit_request<\/td>\n\u5728\u67d0\u53f0\u540e\u7aef\u670d\u52a1\u5668\u51fa\u9519\u7684\u60c5\u51b5\uff0cNginx\u4f1a\u5c1d\u8bd5\u53e6\u4e00\u53f0\u540e\u7aef\u670d\u52a1\u5668\u3002Nginx \u9009\u5b9a\u65b0\u7684\u670d\u52a1\u5668\u4ee5\u540e\uff0c\u4f1a\u5148\u8c03\u7528\u6b64\u51fd\u6570\uff0c\u4ee5\u91cd\u65b0\u521d\u59cb\u5316 upstream \u6a21\u5757\u7684\u5de5\u4f5c\u72b6\u6001\uff0c\u7136\u540e\u518d\u6b21\u8fdb\u884c upstream \u8fde\u63a5\u3002<\/td>\n<\/tr>\n
process_header<\/td>\n\u5904\u7406\u540e\u7aef\u670d\u52a1\u5668\u8fd4\u56de\u7684\u4fe1\u606f\u5934\u90e8\u3002\u6240\u8c13\u5934\u90e8\u662f\u4e0e upstreamserver \u901a\u4fe1\u7684\u534f\u8bae\u89c4\u5b9a\u7684\uff0c\u6bd4\u5982 HTTP \u534f\u8bae\u7684 header \u90e8\u5206\uff0c\u6216\u8005 memcached \u534f\u8bae\u7684\u54cd\u5e94\u72b6\u6001\u90e8\u5206\u3002<\/td>\n<\/tr>\n
abort_request<\/td>\n\u5728\u5ba2\u6237\u7aef\u653e\u5f03\u8bf7\u6c42\u65f6\u88ab\u8c03\u7528\u3002\u4e0d\u9700\u8981\u5728\u51fd\u6570\u4e2d\u5b9e\u73b0\u5173\u95ed\u540e\u7aef\u670d\u52a1\u5668\u8fde\u63a5\u7684\u529f\u80fd\uff0c\u7cfb\u7edf\u4f1a\u81ea\u52a8\u5b8c\u6210\u5173\u95ed\u8fde\u63a5\u7684\u6b65\u9aa4\uff0c\u6240\u4ee5\u4e00\u822c\u6b64\u51fd\u6570\u4e0d\u4f1a\u8fdb\u884c\u4efb\u4f55\u5177\u4f53\u5de5\u4f5c\u3002<\/td>\n<\/tr>\n
finalize_request<\/td>\n\u6b63\u5e38\u5b8c\u6210\u4e0e\u540e\u7aef\u670d\u52a1\u5668\u7684\u8bf7\u6c42\u540e\u8c03\u7528\u8be5\u51fd\u6570\uff0c\u4e0e abort_request \u76f8\u540c\uff0c\u4e00\u822c\u4e5f\u4e0d\u4f1a\u8fdb\u884c\u4efb\u4f55\u5177\u4f53\u5de5\u4f5c\u3002<\/td>\n<\/tr>\n
input_filter<\/td>\n\u5904\u7406\u540e\u7aef\u670d\u52a1\u5668\u8fd4\u56de\u7684\u54cd\u5e94\u6b63\u6587\u3002Nginx \u9ed8\u8ba4\u7684 input_filter \u4f1a\u5c06\u6536\u5230\u7684\u5185\u5bb9\u5c01\u88c5\u6210\u4e3a\u7f13\u51b2\u533a\u94fe ngx_chain\u3002\u8be5\u94fe\u7531 upstream \u7684 out_bufs \u6307\u9488\u57df\u5b9a\u4f4d\uff0c\u6240\u4ee5\u5f00\u53d1\u4eba\u5458\u53ef\u4ee5\u5728\u6a21\u5757\u4ee5\u5916\u901a\u8fc7\u8be5\u6307\u9488 \u5f97\u5230\u540e\u7aef\u670d\u52a1\u5668\u8fd4\u56de\u7684\u6b63\u6587\u6570\u636e\u3002memcached \u6a21\u5757\u5b9e\u73b0\u4e86\u81ea\u5df1\u7684 input_filter\uff0c\u5728\u540e\u9762\u4f1a\u5177\u4f53\u5206\u6790\u8fd9\u4e2a\u6a21\u5757\u3002<\/td>\n<\/tr>\n
input_filter_init<\/td>\n\u521d\u59cb\u5316 input filter \u7684\u4e0a\u4e0b\u6587\u3002Nginx \u9ed8\u8ba4\u7684 input_filter_init \u76f4\u63a5\u8fd4\u56de\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

memcached \u6a21\u5757\u5206\u6790<\/h2>\n

memcache \u662f\u4e00\u6b3e\u9ad8\u6027\u80fd\u7684\u5206\u5e03\u5f0f cache \u7cfb\u7edf\uff0c\u5f97\u5230\u4e86\u975e\u5e38\u5e7f\u6cdb\u7684\u5e94\u7528\u3002memcache \u5b9a\u4e49\u4e86\u4e00\u5957\u79c1\u6709\u901a\u4fe1\u534f\u8bae\uff0c\u4f7f\u5f97\u4e0d\u80fd\u901a\u8fc7 HTTP \u8bf7\u6c42\u6765\u8bbf\u95ee memcache\u3002\u4f46\u534f\u8bae\u672c\u8eab\u7b80\u5355\u9ad8\u6548\uff0c\u800c\u4e14 memcache \u4f7f\u7528\u5e7f\u6cdb\uff0c\u6240\u4ee5\u5927\u90e8\u5206\u73b0\u4ee3\u5f00\u53d1\u8bed\u8a00\u548c\u5e73\u53f0\u90fd\u63d0\u4f9b\u4e86 memcache \u652f\u6301\uff0c\u65b9\u4fbf\u5f00\u53d1\u8005\u4f7f\u7528 memcache\u3002<\/p>\n

Nginx \u63d0\u4f9b\u4e86 ngx_http_memcached \u6a21\u5757\uff0c\u63d0\u4f9b\u4ece memcache \u8bfb\u53d6\u6570\u636e\u7684\u529f\u80fd\uff0c\u800c\u4e0d\u63d0\u4f9b\u5411 memcache \u5199\u6570\u636e\u7684\u529f\u80fd\u3002\u4f5c\u4e3a Web \u670d\u52a1\u5668\uff0c\u8fd9\u79cd\u8bbe\u8ba1\u662f\u53ef\u4ee5\u63a5\u53d7\u7684\u3002<\/p>\n

\u4e0b\u9762\uff0c\u6211\u4eec\u5f00\u59cb\u5206\u6790 ngx_http_memcached \u6a21\u5757\uff0c\u4e00\u7aa5 upstream \u7684\u5965\u79d8\u3002<\/p>\n

Handler \u6a21\u5757\uff1f<\/h2>\n

\u521d\u770b memcached \u6a21\u5757\uff0c\u5927\u5bb6\u53ef\u80fd\u89c9\u5f97\u5e76\u65e0\u7279\u522b\u4e4b\u5904\u3002\u5982\u679c\u7a0d\u5fae\u7ec6\u770b\uff0c\u751a\u81f3\u89c9\u5f97\u6709\u70b9\u50cf handler \u6a21\u5757\uff0c\u5f53\u5927\u5bb6\u770b\u5230\u8fd9\u6bb5\u4ee3\u7801\u4ee5\u540e\uff0c\u5fc5\u5b9a\u7591\u60d1\u4e3a\u4ec0\u4e48\u4f1a\u8ddf handler \u6a21\u5757\u4e00\u6a21\u4e00\u6837\u3002<\/p>\n

        clcf = ngx_http_conf_get_module_loc_conf(cf, ngx_http_core_module);\n        clcf->handler = ngx_http_memcached_handler;<\/code><\/pre>\n
\u56e0\u4e3a upstream \u6a21\u5757\u4f7f\u7528\u7684\u5c31\u662f handler \u6a21\u5757\u7684\u63a5\u5165\u65b9\u5f0f\u3002\u540c\u65f6\uff0cupstream \u6a21\u5757\u7684\u6307\u4ee4\u7cfb\u7edf\u7684\u8bbe\u8ba1\u4e5f\u662f\u9075\u5faa handler \u6a21\u5757\u7684\u57fa\u672c\u89c4\u5219\uff1a\u914d\u7f6e\u8be5\u6a21\u5757\u624d\u4f1a\u6267\u884c\u8be5\u6a21\u5757\u3002<\/p>\n
\n        { ngx_string(\"memcached_pass\"),\n          NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF|NGX_CONF_TAKE1,\n          ngx_http_memcached_pass,\n          NGX_HTTP_LOC_CONF_OFFSET,\n          0,\n          NULL }<\/code><\/pre>\n
\u6240\u4ee5\u5927\u5bb6\u89c9\u5f97\u773c\u719f\u662f\u597d\u4e8b\uff0c\u8bf4\u660e\u5927\u5bb6\u5bf9 Handler \u7684\u5199\u6cd5\u5df2\u7ecf\u5f88\u719f\u6089\u4e86\u3002<\/p>\n
Upstream \u6a21\u5757<\/h2>\n
\u90a3\u4e48\uff0cupstream \u6a21\u5757\u7684\u7279\u522b\u4e4b\u5904\u7a76\u7adf\u5728\u54ea\u91cc\u5462\uff1f\u7b54\u6848\u662f\u5c31\u5728\u6a21\u5757\u5904\u7406\u51fd\u6570\u7684\u5b9e\u73b0\u4e2d\u3002upstream \u6a21\u5757\u7684\u5904\u7406\u51fd\u6570\u8fdb\u884c\u7684\u64cd\u4f5c\u90fd\u5305\u542b\u4e00\u4e2a\u56fa\u5b9a\u7684\u6d41\u7a0b\u3002\u5728 memcached \u7684\u4f8b\u5b50\u4e2d\uff0c\u53ef\u4ee5\u89c2\u5bdf ngx_http_memcached_handler \u7684\u4ee3\u7801\uff0c\u53ef\u4ee5\u53d1\u73b0\uff0c\u8fd9\u4e2a\u56fa\u5b9a\u7684\u64cd\u4f5c\u6d41\u7a0b\u662f\uff1a<\/p>\n
    \n
  1. \u521b\u5efa upstream \u6570\u636e\u7ed3\u6784\u3002<\/li>\n<\/ol>\n
            if (ngx_http_upstream_create(r) != NGX_OK) {\n            return NGX_HTTP_INTERNAL_SERVER_ERROR;\n        }<\/code><\/pre>\n
      \n
    1. \u8bbe\u7f6e\u6a21\u5757\u7684 tag \u548c schema\u3002schema \u73b0\u5728\u53ea\u4f1a\u7528\u4e8e\u65e5\u5fd7\uff0ctag \u4f1a\u7528\u4e8e buf_chain \u7ba1\u7406\u3002<\/li>\n<\/ol>\n
              u = r->upstream;\n\n        ngx_str_set(&u->schema, \"memcached:\/\/\");\n        u->output.tag = (ngx_buf_tag_t) &ngx_http_memcached_module;<\/code><\/pre>\n
        \n
      1. \u8bbe\u7f6e upstream \u7684\u540e\u7aef\u670d\u52a1\u5668\u5217\u8868\u6570\u636e\u7ed3\u6784\u3002<\/li>\n<\/ol>\n
                mlcf = ngx_http_get_module_loc_conf(r, ngx_http_memcached_module);\n        u->conf = &mlcf->upstream;<\/code><\/pre>\n
          \n
        1. \u8bbe\u7f6e upstream \u56de\u8c03\u51fd\u6570\u3002\u5728\u8fd9\u91cc\u5217\u51fa\u7684\u4ee3\u7801\u7a0d\u7a0d\u8c03\u6574\u4e86\u4ee3\u7801\u987a\u5e8f\u3002<\/li>\n<\/ol>\n
                  u->create_request = ngx_http_memcached_create_request;\n        u->reinit_request = ngx_http_memcached_reinit_request;\n        u->process_header = ngx_http_memcached_process_header;\n        u->abort_request = ngx_http_memcached_abort_request;\n        u->finalize_request = ngx_http_memcached_finalize_request;\n        u->input_filter_init = ngx_http_memcached_filter_init;\n        u->input_filter = ngx_http_memcached_filter;<\/code><\/pre>\n
            \n
          1. \u521b\u5efa\u5e76\u8bbe\u7f6e upstream \u73af\u5883\u6570\u636e\u7ed3\u6784\u3002<\/li>\n<\/ol>\n
                    ctx = ngx_palloc(r->pool, sizeof(ngx_http_memcached_ctx_t));\n        if (ctx == NULL) {\n            return NGX_HTTP_INTERNAL_SERVER_ERROR;\n        }\n\n        ctx->rest = NGX_HTTP_MEMCACHED_END;\n        ctx->request = r;\n\n        ngx_http_set_ctx(r, ctx, ngx_http_memcached_module);\n\n        u->input_filter_ctx = ctx;<\/code><\/pre>\n
              \n
            1. \u5b8c\u6210 upstream \u521d\u59cb\u5316\u5e76\u8fdb\u884c\u6536\u5c3e\u5de5\u4f5c\u3002<\/li>\n<\/ol>\n
                      r->main->count++;\n        ngx_http_upstream_init(r);\n        return NGX_DONE;<\/code><\/pre>\n
              \u4efb\u4f55 upstream \u6a21\u5757\uff0c\u7b80\u5355\u5982 memcached\uff0c\u590d\u6742\u5982 proxy\u3001fastcgi \u90fd\u662f\u5982\u6b64\u3002\u4e0d\u540c\u7684 upstream \u6a21\u5757\u5728\u8fd9 6 \u6b65\u4e2d\u7684\u6700\u5927\u5dee\u522b\u4f1a\u51fa\u73b0\u5728\u7b2c 2\u30013\u30014\u30015 \u4e0a\u3002\u5176\u4e2d\u7b2c 2\u30014 \u4e24\u6b65\u5f88\u5bb9\u6613\u7406\u89e3\uff0c\u4e0d\u540c\u7684\u6a21\u5757\u8bbe\u7f6e\u7684\u6807\u5fd7\u548c\u4f7f\u7528\u7684\u56de\u8c03\u51fd\u6570\u80af\u5b9a\u4e0d\u540c\u3002\u7b2c 5 \u6b65\u4e5f\u4e0d\u96be\u7406\u89e3\uff0c\u53ea\u6709\u7b2c3\u6b65\u662f\u6700\u4e3a\u6666\u6da9\u7684\uff0c\u4e0d\u540c\u7684\u6a21\u5757\u5728\u53d6\u5f97\u540e\u7aef\u670d\u52a1\u5668\u5217\u8868\u65f6\uff0c\u7b56\u7565\u7684\u5dee\u5f02\u975e\u5e38\u5927\uff0c\u6709\u5982 memcached \u8fd9\u6837\u7b80\u5355\u660e\u4e86\u7684\uff0c\u4e5f\u6709\u5982 proxy \u90a3\u6837\u903b\u8f91\u590d\u6742\u7684\u3002\u8fd9\u4e2a\u95ee\u9898\u5148\u8bb0\u4e0b\u6765\uff0c\u7b49\u628amemcached\u5256\u6790\u6e05\u695a\u4e86\uff0c\u518d\u5355\u72ec\u8ba8\u8bba\u3002<\/p>\n
              \u7b2c 6 \u6b65\u662f\u4e00\u4e2a\u5e38\u6001\u3002\u5c06 count \u52a0 1\uff0c\u7136\u540e\u8fd4\u56de NGX_DONE\u3002Nginx \u9047\u5230\u8fd9\u79cd\u60c5\u51b5\uff0c\u867d\u7136\u4f1a\u8ba4\u4e3a\u5f53\u524d\u8bf7\u6c42\u7684\u5904\u7406\u5df2\u7ecf\u7ed3\u675f\uff0c\u4f46\u662f\u4e0d\u4f1a\u91ca\u653e\u8bf7\u6c42\u4f7f\u7528\u7684\u5185\u5b58\u8d44\u6e90\uff0c\u4e5f\u4e0d\u4f1a\u5173\u95ed\u4e0e\u5ba2\u6237\u7aef\u7684\u8fde\u63a5\u3002\u4e4b\u6240\u4ee5\u9700\u8981\u8fd9\u6837\uff0c\u662f\u56e0\u4e3a Nginx \u5efa\u7acb\u4e86 upstream \u8bf7\u6c42\u548c\u5ba2\u6237\u7aef\u8bf7\u6c42\u4e4b\u95f4\u4e00\u5bf9\u4e00\u7684\u5173\u7cfb\uff0c\u5728\u540e\u7eed\u4f7f\u7528 ngx_event_pipe \u5c06 upstream \u54cd\u5e94\u53d1\u9001\u56de\u5ba2\u6237\u7aef\u65f6\uff0c\u8fd8\u8981\u4f7f\u7528\u5230\u8fd9\u4e9b\u4fdd\u5b58\u7740\u5ba2\u6237\u7aef\u4fe1\u606f\u7684\u6570\u636e\u7ed3\u6784\u3002\u8fd9\u90e8\u5206\u4f1a\u5728\u540e\u9762\u7684\u539f\u7406\u7bc7\u505a\u5177\u4f53\u4ecb\u7ecd\uff0c\u8fd9\u91cc\u4e0d\u518d\u5c55\u5f00\u3002<\/p>\n
              \u5c06 upstream \u8bf7\u6c42\u548c\u5ba2\u6237\u7aef\u8bf7\u6c42\u8fdb\u884c\u4e00\u5bf9\u4e00\u7ed1\u5b9a\uff0c\u8fd9\u4e2a\u8bbe\u8ba1\u6709\u4f18\u52bf\u4e5f\u6709\u7f3a\u9677\u3002\u4f18\u52bf\u5c31\u662f\u7b80\u5316\u6a21\u5757\u5f00\u53d1\uff0c\u53ef\u4ee5\u5c06\u7cbe\u529b\u96c6\u4e2d\u5728\u6a21\u5757\u903b\u8f91\u4e0a\uff0c\u800c\u7f3a\u9677\u540c\u6837\u660e\u663e\uff0c\u4e00\u5bf9\u4e00\u7684\u8bbe\u8ba1\u5f88\u591a\u65f6\u5019\u90fd\u4e0d\u80fd\u6ee1\u8db3\u590d\u6742\u903b\u8f91\u7684\u9700\u8981\u3002\u5bf9\u4e8e\u8fd9\u4e00\u70b9\uff0c\u5c06\u4f1a\u5728\u540e\u9762\u7684\u539f\u7406\u7bc7\u6765\u9610\u8ff0\u3002<\/p>\n
              \u56de\u8c03\u51fd\u6570<\/h2>\n
              \u524d\u9762\u5256\u6790\u4e86 memcached \u6a21\u5757\u7684\u9aa8\u67b6\uff0c\u73b0\u5728\u5f00\u59cb\u9010\u4e2a\u89e3\u51b3\u6bcf\u4e2a\u56de\u8c03\u51fd\u6570\u3002<\/p>\n
                \n
              • \n
                ngx_http_memcached_create_request\uff1a\u5f88\u7b80\u5355\u7684\u6309\u7167\u8bbe\u7f6e\u7684\u5185\u5bb9\u751f\u6210\u4e00\u4e2a key\uff0c\u63a5\u7740\u751f\u6210\u4e00\u4e2a\u201cget $key\u201d\u7684\u8bf7\u6c42\uff0c\u653e\u5728 r->upstream->request_bufs \u91cc\u9762\u3002<\/p>\n<\/li>\n
              • \n
                ngx_http_memcached_reinit_request\uff1a\u65e0\u9700\u521d\u59cb\u5316\u3002<\/p>\n<\/li>\n
              • \n
                ngx_http_memcached_abort_request\uff1a\u65e0\u9700\u989d\u5916\u64cd\u4f5c\u3002<\/p>\n<\/li>\n
              • \n
                ngx_http_memcached_finalize_request\uff1a\u65e0\u9700\u989d\u5916\u64cd\u4f5c\u3002<\/p>\n<\/li>\n
              • ngx_http_memcached_process_header\uff1a\u6a21\u5757\u7684\u4e1a\u52a1\u91cd\u70b9\u51fd\u6570\u3002memcache \u534f\u8bae\u7684\u5934\u90e8\u4fe1\u606f\u88ab\u5b9a\u4e49\u4e3a\u7b2c\u4e00\u884c\u6587\u672c\uff0c\u53ef\u4ee5\u627e\u5230\u8fd9\u6bb5\u4ee3\u7801\u8bc1\u660e\uff1a<\/li>\n<\/ul>\n
                        for (p = u->buffer.pos; p < u->buffer.last; p++) {\n            if ( * p == LF) {\n            goto found;\n        }<\/code><\/pre>\n
                \u5982\u679c\u5728\u5df2\u8bfb\u5165\u7f13\u51b2\u7684\u6570\u636e\u4e2d\u6ca1\u6709\u53d1\u73b0 LF('\\n')\u5b57\u7b26\uff0c\u51fd\u6570\u8fd4\u56de NGX_AGAIN\uff0c\u8868\u793a\u5934\u90e8\u672a\u5b8c\u5168\u8bfb\u5165\uff0c\u9700\u8981\u7ee7\u7eed\u8bfb\u53d6\u6570\u636e\u3002Nginx \u5728\u6536\u5230\u65b0\u7684\u6570\u636e\u4ee5\u540e\u4f1a\u518d\u6b21\u8c03\u7528\u8be5\u51fd\u6570\u3002<\/p>\n
                Nginx \u5904\u7406\u540e\u7aef\u670d\u52a1\u5668\u7684\u54cd\u5e94\u5934\u65f6\u53ea\u4f1a\u4f7f\u7528\u4e00\u5757\u7f13\u5b58\uff0c\u6240\u6709\u6570\u636e\u90fd\u5728\u8fd9\u5757\u7f13\u5b58\u4e2d\uff0c\u6240\u4ee5\u89e3\u6790\u5934\u90e8\u4fe1\u606f\u65f6\u4e0d\u9700\u8981\u8003\u8651\u5934\u90e8\u4fe1\u606f\u8de8\u8d8a\u591a\u5757\u7f13\u5b58\u7684\u60c5\u51b5\u3002\u800c\u5982\u679c\u5934\u90e8\u8fc7\u5927\uff0c\u4e0d\u80fd\u4fdd\u5b58\u5728\u8fd9\u5757\u7f13\u5b58\u4e2d\uff0cNginx \u4f1a\u8fd4\u56de\u9519\u8bef\u4fe1\u606f\u7ed9\u5ba2\u6237\u7aef\uff0c\u5e76\u8bb0\u5f55 error log\uff0c\u63d0\u793a\u7f13\u5b58\u4e0d\u591f\u5927\u3002<\/p>\n
                process_header \u7684\u91cd\u8981\u804c\u8d23\u662f\u5c06\u540e\u7aef\u670d\u52a1\u5668\u8fd4\u56de\u7684\u72b6\u6001\u7ffb\u8bd1\u6210\u8fd4\u56de\u7ed9\u5ba2\u6237\u7aef\u7684\u72b6\u6001\u3002\u4f8b\u5982\uff0c\u5728 ngx_http_memcached_process_header \u4e2d\uff0c\u6709\u8fd9\u6837\u51e0\u6bb5\u4ee3\u7801\uff1a<\/p>\n
                        r->headers_out.content_length_n = ngx_atoof(len, p - len - 1);\n\n        u->headers_in.status_n = 200;\n        u->state->status = 200;\n\n        u->headers_in.status_n = 404;\n        u->state->status = 404;<\/code><\/pre>\n
                u->state \u7528\u4e8e\u8ba1\u7b97 upstream \u76f8\u5173\u7684\u53d8\u91cf\u3002\u6bd4\u5982 u->state->status \u5c06\u88ab\u7528\u4e8e\u8ba1\u7b97\u53d8\u91cf\u201cupstream_status\u201d\u7684\u503c\u3002u->headers_in \u5c06\u88ab\u4f5c\u4e3a\u8fd4\u56de\u7ed9\u5ba2\u6237\u7aef\u7684\u54cd\u5e94\u8fd4\u56de\u72b6\u6001\u7801\u3002\u800c\u7b2c\u4e00\u884c\u5219\u662f\u8bbe\u7f6e\u8fd4\u56de\u7ed9\u5ba2\u6237\u7aef\u7684\u54cd\u5e94\u7684\u957f\u5ea6\u3002<\/p>\n
                \u5728\u8fd9\u4e2a\u51fd\u6570\u4e2d\u4e0d\u80fd\u5fd8\u8bb0\u7684\u4e00\u4ef6\u4e8b\u60c5\u662f\u5904\u7406\u5b8c\u5934\u90e8\u4fe1\u606f\u4ee5\u540e\u9700\u8981\u5c06\u8bfb\u6307\u9488 pos \u540e\u79fb\uff0c\u5426\u5219\u8fd9\u6bb5\u6570\u636e\u4e5f\u5c06\u88ab\u590d\u5236\u5230\u8fd4\u56de\u7ed9\u5ba2\u6237\u7aef\u7684\u54cd\u5e94\u7684\u6b63\u6587\u4e2d\uff0c\u8fdb\u800c\u5bfc\u81f4\u6b63\u6587\u5185\u5bb9\u4e0d\u6b63\u786e\u3002<\/p>\n
                \n        u->buffer.pos = p + 1;<\/code><\/pre>\n
                process_header \u51fd\u6570\u5b8c\u6210\u54cd\u5e94\u5934\u7684\u6b63\u786e\u5904\u7406\uff0c\u5e94\u8be5\u8fd4\u56de NGX_OK\u3002\u5982\u679c\u8fd4\u56de NGX_AGAIN\uff0c\u8868\u793a\u672a\u8bfb\u53d6\u5b8c\u6574\u6570\u636e\uff0c\u9700\u8981\u4ece\u540e\u7aef\u670d\u52a1\u5668\u7ee7\u7eed\u8bfb\u53d6\u6570\u636e\u3002\u8fd4\u56de NGX_DECLINED \u65e0\u610f\u4e49\uff0c\u5176\u4ed6\u4efb\u4f55\u8fd4\u56de\u503c\u90fd\u88ab\u8ba4\u4e3a\u662f\u51fa\u9519\u72b6\u6001\uff0cNginx \u5c06\u7ed3\u675f upstream \u8bf7\u6c42\u5e76\u8fd4\u56de\u9519\u8bef\u4fe1\u606f\u3002<\/p>\n
                  \n
                • \n
                  ngx_http_memcached_filter_init\uff1a\u4fee\u6b63\u4ece\u540e\u7aef\u670d\u52a1\u5668\u6536\u5230\u7684\u5185\u5bb9\u957f\u5ea6\u3002\u56e0\u4e3a\u5728\u5904\u7406 header \u65f6\u6ca1\u6709\u52a0\u4e0a\u8fd9\u90e8\u5206\u957f\u5ea6\u3002<\/p>\n<\/li>\n
                • ngx_http_memcached_filter\uff1amemcached \u6a21\u5757\u662f\u5c11\u6709\u7684\u5e26\u6709\u5904\u7406\u6b63\u6587\u7684\u56de\u8c03\u51fd\u6570\u7684\u6a21\u5757\u3002\u56e0\u4e3a memcached \u6a21\u5757\u9700\u8981\u8fc7\u6ee4\u6b63\u6587\u672b\u5c3e CRLF \"END\" CRLF\uff0c\u6240\u4ee5\u5b9e\u73b0\u4e86\u81ea\u5df1\u7684 filter \u56de\u8c03\u51fd\u6570\u3002\u5904\u7406\u6b63\u6587\u7684\u5b9e\u9645\u610f\u4e49\u662f\u5c06\u4ece\u540e\u7aef\u670d\u52a1\u5668\u6536\u5230\u7684\u6b63\u6587\u6709\u6548\u5185\u5bb9\u5c01\u88c5\u6210 ngx_chain_t\uff0c\u5e76\u52a0\u5728 u->out_bufs \u672b\u5c3e\u3002Nginx \u5e76\u4e0d\u8fdb\u884c\u6570\u636e\u62f7\u8d1d\uff0c\u800c\u662f\u5efa\u7acb ngx_buf_t \u6570\u636e\u7ed3\u6784\u6307\u5411\u8fd9\u4e9b\u6570\u636e\u5185\u5b58\u533a\uff0c\u7136\u540e\u7531 ngx_chain_t \u7ec4\u7ec7\u8fd9\u4e9b buf\u3002\u8fd9\u79cd\u5b9e\u73b0\u907f\u514d\u4e86\u5185\u5b58\u5927\u91cf\u642c\u8fc1\uff0c\u4e5f\u662f Nginx \u9ad8\u6548\u7684\u5965\u79d8\u4e4b\u4e00\u3002<\/li>\n<\/ul>\n
                  \u672c\u8282\u56de\u987e<\/h2>\n
                  \u8fd9\u4e00\u8282\u4ecb\u7ecd\u4e86 upstream \u6a21\u5757\u7684\u57fa\u672c\u7ec4\u6210\u3002upstream \u6a21\u5757\u662f\u4ece handler \u6a21\u5757\u53d1\u5c55\u800c\u6765\uff0c\u6307\u4ee4\u7cfb\u7edf\u548c\u6a21\u5757\u751f\u6548\u65b9\u5f0f\u4e0e handler \u6a21\u5757\u65e0\u5f02\u3002\u4e0d\u540c\u4e4b\u5904\u5728\u4e8e\uff0cupstream \u6a21\u5757\u5728 handler \u51fd\u6570\u4e2d\u8bbe\u7f6e\u4f17\u591a\u56de\u8c03\u51fd\u6570\u3002\u5b9e\u9645\u5de5\u4f5c\u90fd\u662f\u7531\u8fd9\u4e9b\u56de\u8c03\u51fd\u6570\u5b8c\u6210\u7684\u3002\u6bcf\u4e2a\u56de\u8c03\u51fd\u6570\u90fd\u662f\u5728 upstream \u7684\u67d0\u4e2a\u56fa\u5b9a\u9636\u6bb5\u6267\u884c\uff0c\u5404\u53f8\u5176\u804c\uff0c\u5927\u90e8\u5206\u56de\u8c03\u51fd\u6570\u4e00\u822c\u4e0d\u4f1a\u771f\u6b63\u7528\u5230\u3002upstream \u6700\u91cd\u8981\u7684\u56de\u8c03\u51fd\u6570\u662f create_request\u3001process_header \u548c input_filter\uff0c\u4ed6\u4eec\u5171\u540c\u5b9e\u73b0\u4e86\u4e0e\u540e\u7aef\u670d\u52a1\u5668\u7684\u534f\u8bae\u7684\u89e3\u6790\u90e8\u5206\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
                  upstream \u6a21\u5757\u7b80\u4ecb Nginx \u6a21\u5757\u4e00\u822c\u88ab\u5206\u6210\u4e09\u5927\u7c7b\uff1ahandler\u3001filter \u548c upstrea […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[42],"tags":[],"class_list":["post-191748","post","type-post","status-publish","format-standard","hentry","category-nginx"],"_links":{"self":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/191748","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/comments?post=191748"}],"version-history":[{"count":0,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/191748\/revisions"}],"wp:attachment":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/media?parent=191748"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/categories?post=191748"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/tags?post=191748"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}