{"id":492,"title":"\u4e00\u6b21504 Gateway Time-out\u6392\u9664\u8fc7\u7a0b","good":0,"bad":0,"hit":1997,"created_at":"2020-06-24 14:43:30","content":"<p>\u7f51\u7ad9\u8bbf\u95ee\u91cf\u5f88\u5c0f\u7684\u65f6\u5019\uff0c\u9875\u9762\u62a5504 Gateway Time-out<\/p><p>\u67e5\u770b\u670d\u52a1\u5668\u53d1\u73b0\u5185\u5b58\u7a7a\u95f2\u7a7a\u95f4free\u5f88\u5c0f\uff0c\u4f46\u662fbuff\/cache\u5f88\u9ad8<\/p><p>\u53ef\u4ee5\u901a\u8fc7\u6b64\u5de5\u5177\u6765\u67e5\u770bbuff\/cache\u9ad8\u7684\u8fdb\u7a0b\uff1a<\/p><p><a href=\"https:\/\/www.cnblogs.com\/zh94\/p\/11922714.html\">https:\/\/www.cnblogs.com\/zh94\/p\/11922714.html<\/a><\/p><p><img src=\"https:\/\/api.hu-rong.com\/uploads\/image\/20200624\/1592980105635877.png\" title=\"1592980105635877.png\" alt=\"image.png\"\/><\/p><p>\u6000\u7591\u662f\u7f13\u51b2\u533a\u7684\u6570\u636e\u6ca1\u6709\u53ca\u65f6\u5199\u5165\u78c1\u76d8\uff0c\u53ef\u80fd\u662f\u7f13\u51b2\u533a\u7684\u6570\u636e\uff0c\u6ca1\u6709\u88ab\u76f8\u5e94\u7a0b\u5e8f\u4f7f\u7528\uff0c\u5bfc\u81f4\u4e00\u76f4\u5b58\u5728\u4e8e\u7f13\u51b2\u533a\uff0c\u670d\u52a1\u5668\u5185\u5b58\u4e0d\u591f\u5bfc\u81f4nginx\u65e0\u6cd5\u63d0\u4f9b\u670d\u52a1\uff08\u56e0\u4e3anginx\u672c\u8eab\u4e5f\u662f\u9700\u8981\u7528\u5230\u7f13\u51b2\u533a\u7684\uff09\u800c\u73b0\u5728\u7a7a\u95f2\u7684\u5185\u5b58\u5df2\u7ecf\u4e0d\u591f\u7528\u4e86\uff1b<\/p><p>\u5176\u5b9e\uff1abuffers\/cache\u5360\u7528\u7684\u8f83\u591a\uff0c\u8bf4\u660e\u7cfb\u7edf\u4e2d\u6709\u8fdb\u7a0b\u66fe\u7ecf\u8bfb\u5199\u8fc7\u6587\u4ef6\uff0c\u4f46\u662f\u4e0d\u8981\u7d27\uff0c\u8fd9\u90e8\u5206\u5185\u5b58\u662f\u5f53\u7a7a\u95f2\u6765\u7528\u7684<\/p><p>Linux\u5185\u6838\u4f1a\u5728\u5185\u5b58\u5c06\u8981\u8017\u5c3d\u7684\u65f6\u5019\uff0c\u89e6\u53d1\u5185\u5b58\u56de\u6536\u7684\u5de5\u4f5c\uff0c\u4ee5\u4fbf\u91ca\u653e\u51fa\u5185\u5b58\u7ed9\u6025\u9700\u5185\u5b58\u7684\u8fdb\u7a0b\u4f7f\u7528\u3002\u4e00\u822c\u60c5\u51b5\u4e0b\uff0c\u8fd9\u4e2a\u64cd\u4f5c\u4e2d\u4e3b\u8981\u7684\u5185\u5b58\u91ca\u653e\u90fd\u6765\u81ea\u4e8e\u5bf9buffer\uff0fcache\u7684\u91ca\u653e\u3002\u5c24\u5176\u662f\u88ab\u4f7f\u7528\u66f4\u591a\u7684cache\u7a7a\u95f4\u3002\u65e2\u7136\u5b83\u4e3b\u8981\u7528\u6765\u505a\u7f13\u5b58\uff0c\u53ea\u662f\u5728\u5185\u5b58\u591f\u7528\u7684\u65f6\u5019\u52a0\u5feb\u8fdb\u7a0b\u5bf9\u6587\u4ef6\u7684\u8bfb\u5199\u901f\u5ea6\uff0c\u90a3\u4e48\u5728\u5185\u5b58\u538b\u529b\u8f83\u5927\u7684\u60c5\u51b5\u4e0b\uff0c\u5f53\u7136\u6709\u5fc5\u8981\u6e05\u7a7a\u91ca\u653ecache\uff0c\u4f5c\u4e3afree\u7a7a\u95f4\u5206\u7ed9\u76f8\u5173\u8fdb\u7a0b\u4f7f\u7528\u3002\u6240\u4ee5\u4e00\u822c\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u8ba4\u4e3abuffer\/cache\u7a7a\u95f4\u53ef\u4ee5\u88ab\u91ca\u653e\uff0c\u8fd9\u4e2a\u7406\u89e3\u662f\u6b63\u786e\u7684\u3002<br\/><\/p><p>\u4f46\u662f\u8fd9\u79cd\u6e05\u7f13\u5b58\u7684\u5de5\u4f5c\u4e5f\u5e76\u4e0d\u662f\u6ca1\u6709\u6210\u672c\u3002\u7406\u89e3cache\u662f\u5e72\u4ec0\u4e48\u7684\u5c31\u53ef\u4ee5\u660e\u767d\u6e05\u7f13\u5b58\u5fc5\u987b\u4fdd\u8bc1cache\u4e2d\u7684\u6570\u636e\u8ddf\u5bf9\u5e94\u6587\u4ef6\u4e2d\u7684\u6570\u636e\u4e00\u81f4\uff0c\u624d\u80fd\u5bf9cache\u8fdb\u884c\u91ca\u653e\u3002\u6240\u4ee5\u4f34\u968f\u7740cache\u6e05\u9664\u7684\u884c\u4e3a\u7684\uff0c\u4e00\u822c\u90fd\u662f\u7cfb\u7edfIO\u98d9\u9ad8\u3002\u56e0\u4e3a\u5185\u6838\u8981\u5bf9\u6bd4cache\u4e2d\u7684\u6570\u636e\u548c\u5bf9\u5e94\u786c\u76d8\u6587\u4ef6\u4e0a\u7684\u6570\u636e\u662f\u5426\u4e00\u81f4\uff0c\u5982\u679c\u4e0d\u4e00\u81f4\u9700\u8981\u5199\u56de\uff0c\u4e4b\u540e\u624d\u80fd\u56de\u6536\u3002<\/p><p>\u5728\u7cfb\u7edf\u4e2d\u9664\u4e86\u5185\u5b58\u5c06\u88ab\u8017\u5c3d\u7684\u65f6\u5019\u53ef\u4ee5\u6e05\u7f13\u5b58\u4ee5\u5916\uff0c\u6211\u4eec\u8fd8\u53ef\u4ee5\u4f7f\u7528\u4e0b\u9762\u8fd9\u4e2a\u6587\u4ef6\u6765\u4eba\u5de5\u89e6\u53d1\u7f13\u5b58\u6e05\u9664\u7684\u64cd\u4f5c,\u6216\u8005\u5199\u6210\u5b9a\u65f6\u4efb\u52a1\uff1a<\/p><pre class=\"brush:bash;toolbar:false\">echo&nbsp;1&nbsp;&gt;&nbsp;\/proc\/sys\/vm\/drop_caches:\u8868\u793a\u6e05\u9664pagecache\u3002\necho&nbsp;2&nbsp;&gt;&nbsp;\/proc\/sys\/vm\/drop_caches:\u8868\u793a\u6e05\u9664\u56de\u6536slab\u5206\u914d\u5668\u4e2d\u7684\u5bf9\u8c61\uff08\u5305\u62ec\u76ee\u5f55\u9879\u7f13\u5b58\u548cinode\u7f13\u5b58\uff09\u3002slab\u5206\u914d\u5668\u662f\u5185\u6838\u4e2d\u7ba1\u7406\u5185\u5b58\u7684\u4e00\u79cd\u673a\u5236\uff0c\u5176\u4e2d\u5f88\u591a\u7f13\u5b58\u6570\u636e\u5b9e\u73b0\u90fd\u662f\u7528\u7684pagecache\u3002\necho&nbsp;3&nbsp;&gt;&nbsp;\/proc\/sys\/vm\/drop_caches:\u8868\u793a\u6e05\u9664pagecache\u548cslab\u5206\u914d\u5668\u4e2d\u7684\u7f13\u5b58\u5bf9\u8c61\u3002<\/pre><p><br\/><\/p><p><img src=\"https:\/\/api.hu-rong.com\/uploads\/image\/20200624\/1592980321277652.png\" title=\"1592980321277652.png\" alt=\"image.png\"\/><\/p><p>\u7528sync\u5f3a\u5236\u5c06\u7f13\u51b2\u533a\u7684\u5185\u5bb9\u5199\u5165\u540e\u8fd8\u662f\u6ca1\u53d8\u5316\uff0c\u7ee7\u7eed\u67e5\u627e<\/p><p><img src=\"https:\/\/api.hu-rong.com\/uploads\/image\/20200624\/1592980431303965.png\" title=\"1592980431303965.png\" alt=\"image.png\"\/><\/p><p>\u53d1\u73b0redis\u7684Recv-Q\u5f88\u9ad8\uff08\u975e0\u72b6\u6001\uff0c\u6b63\u5e38\u4e00\u822c\u4e3a0\uff09<\/p><p><br\/><\/p><p style=\"box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; font-family: Georgia, &quot;Bitstream Charter&quot;, serif; color: rgb(51, 51, 51); line-height: 24px; overflow-x: auto; overflow-wrap: break-word; white-space: normal; background-color: rgb(255, 255, 255); border: 0px; vertical-align: baseline;\">recv-Q \u8868\u793a\u7f51\u7edc\u63a5\u6536\u961f\u5217<br\/>\u8868\u793a\u6536\u5230\u7684\u6570\u636e\u5df2\u7ecf\u5728\u672c\u5730\u63a5\u6536\u7f13\u51b2\uff0c\u4f46\u662f\u8fd8\u6709\u591a\u5c11\u6ca1\u6709\u88ab\u8fdb\u7a0b\u53d6\u8d70\uff0crecv()<br\/>\u5982\u679c\u63a5\u6536\u961f\u5217Recv-Q\u4e00\u76f4\u5904\u4e8e\u963b\u585e\u72b6\u6001\uff0c\u53ef\u80fd\u662f\u906d\u53d7\u4e86\u62d2\u7edd\u670d\u52a1 denial-of-service \u653b\u51fb\u3002<\/p><p style=\"box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; font-family: Georgia, &quot;Bitstream Charter&quot;, serif; color: rgb(51, 51, 51); line-height: 24px; overflow-x: auto; overflow-wrap: break-word; white-space: normal; background-color: rgb(255, 255, 255); border: 0px; vertical-align: baseline;\">send-Q \u8868\u793a\u7f51\u8def\u53d1\u9001\u961f\u5217<br\/>\u5bf9\u65b9\u6ca1\u6709\u6536\u5230\u7684\u6570\u636e\u6216\u8005\u8bf4\u6ca1\u6709Ack\u7684,\u8fd8\u662f\u672c\u5730\u7f13\u51b2\u533a.<br\/>\u5982\u679c\u53d1\u9001\u961f\u5217Send-Q\u4e0d\u80fd\u5f88\u5feb\u7684\u6e05\u96f6\uff0c\u53ef\u80fd\u662f\u6709\u5e94\u7528\u5411\u5916\u53d1\u9001\u6570\u636e\u5305\u8fc7\u5feb\uff0c\u6216\u8005\u662f\u5bf9\u65b9\u63a5\u6536\u6570\u636e\u5305\u4e0d\u591f\u5feb\u3002<\/p><p style=\"box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; font-family: Georgia, &quot;Bitstream Charter&quot;, serif; color: rgb(51, 51, 51); line-height: 24px; overflow-x: auto; overflow-wrap: break-word; white-space: normal; background-color: rgb(255, 255, 255); border: 0px; vertical-align: baseline;\">\u8fd9\u4e24\u4e2a\u503c\u901a\u5e38\u5e94\u8be5\u4e3a0\uff0c\u5982\u679c\u4e0d\u4e3a0\u53ef\u80fd\u662f\u6709\u95ee\u9898\u7684\u3002packets\u5728\u4e24\u4e2a\u961f\u5217\u91cc\u90fd\u4e0d\u5e94\u8be5\u6709\u5806\u79ef\u72b6\u6001\u3002\u53ef\u63a5\u53d7\u77ed\u6682\u7684\u975e0\u60c5\u51b5\u3002<\/p><p style=\"box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; font-family: Georgia, &quot;Bitstream Charter&quot;, serif; color: rgb(51, 51, 51); line-height: 24px; overflow-x: auto; overflow-wrap: break-word; white-space: normal; background-color: rgb(255, 255, 255); border: 0px; vertical-align: baseline;\">\u4ece\u56fe\u4e2d\u53ef\u4ee5\u770b\u5230\u662f\u5927\u91cf\u7684 send-Q ,\u53ef\u4ee5\u5224\u5b9a\u662f\u53d1\u9001\u6570\u636e\u7ed9\u76ee\u7684\u5730\u5740\u7684\u65f6\u5019\u51fa\u73b0\u4e86\u963b\u585e\u7684\u95ee\u9898\uff0c\u5bfc\u81f4\u4e86\u5305\u5806\u79ef\u5728\u672c\u5730\u7f13\u5b58\u4e2d\uff0c\u4e0d\u80fd\u6210\u529f\u53d1\u51fa\u53bb\u3002<\/p><p style=\"box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; font-family: Georgia, &quot;Bitstream Charter&quot;, serif; color: rgb(51, 51, 51); line-height: 24px; overflow-x: auto; overflow-wrap: break-word; white-space: normal; background-color: rgb(255, 255, 255); border: 0px; vertical-align: baseline;\">\u90a3\u4e48\u95ee\u9898\u5c31\u4ea7\u751f\u5728\u4e86\u5ba2\u6237\u7aef\uff0c\u6839\u636e\u516c\u53f8\u7684\u4e1a\u52a1\u903b\u8f91\u53d1\u73b0\u662f\u5ba2\u6237\u7aef\u53d1\u9001\u7684TCP\u957f\u8fde\u63a5\u6570\u91cf\u8fc7\u591a\u3002<\/p><p style=\"box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; font-family: Georgia, &quot;Bitstream Charter&quot;, serif; color: rgb(51, 51, 51); line-height: 24px; overflow-x: auto; overflow-wrap: break-word; white-space: normal; background-color: rgb(255, 255, 255); border: 0px; vertical-align: baseline;\">\u7ecf\u540e\u9762\u6392\u5e8f\u662f\u6709\u4e00\u4e2a\u7a0b\u5e8f\u5faa\u73af\u6267\u884c\u6ca1\u6709\u7ed9\u7b49\u5f85\u65f6\u95f4\uff0c\u540c\u65f6\u5728\u5199redis,kill\u6389redis\u8fdb\u7a0b<\/p><p style=\"box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; font-family: Georgia, &quot;Bitstream Charter&quot;, serif; color: rgb(51, 51, 51); line-height: 24px; overflow-x: auto; overflow-wrap: break-word; white-space: normal; background-color: rgb(255, 255, 255); border: 0px; vertical-align: baseline;\">\u4fee\u6539redis\u914d\u7f6e(\/etc\/redis\/6379.conf)\uff0c\u5c06stop-writes-on-bgsave-error&nbsp;\u8bbe\u4e3ano<\/p><p style=\"box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; font-family: Georgia, &quot;Bitstream Charter&quot;, serif; color: rgb(51, 51, 51); line-height: 24px; overflow-x: auto; overflow-wrap: break-word; white-space: normal; background-color: rgb(255, 255, 255); border: 0px; vertical-align: baseline;\"><span style=\"color: rgb(51, 51, 51); font-family: Georgia, &quot;Bitstream Charter&quot;, serif; background-color: rgb(255, 255, 255);\">\u540c\u65f6\u4f18\u5316\u7a0b\u5e8f(usleep\u4e00\u5b9a\u65f6\u95f4)<\/span><\/p><p style=\"box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; font-family: Georgia, &quot;Bitstream Charter&quot;, serif; color: rgb(51, 51, 51); line-height: 24px; overflow-x: auto; overflow-wrap: break-word; white-space: normal; background-color: rgb(255, 255, 255); border: 0px; vertical-align: baseline;\">\u91cd\u542f redis \u89e3\u51b3\u95ee\u9898<\/p><p><img src=\"https:\/\/api.hu-rong.com\/uploads\/image\/20200624\/1592980896407857.png\" title=\"1592980896407857.png\" alt=\"image.png\"\/><\/p><p>\u91cd\u542f\u540e Recv-Q\u6b63\u5e38<\/p><p><img src=\"https:\/\/api.hu-rong.com\/uploads\/image\/20200624\/1592980987651302.png\" title=\"1592980987651302.png\" alt=\"image.png\"\/><\/p>"}