{"id":75976,"date":"2024-10-16T02:49:15","date_gmt":"2024-10-15T18:49:15","guid":{"rendered":"https:\/\/server.hk\/cnblog\/75976\/"},"modified":"2024-10-16T02:49:15","modified_gmt":"2024-10-15T18:49:15","slug":"mysql-%e4%bc%ba%e6%9c%8d%e5%99%a8%e7%99%bc%e7%8f%be%e5%a4%a7%e9%87%8ftime_wait%e8%a7%a3%e6%b1%ba%e8%be%a6%e6%b3%95","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/75976\/","title":{"rendered":"MySQL \u4f3a\u670d\u5668\u767c\u73fe\u5927\u91cfTIME_WAIT\u89e3\u6c7a\u8fa6\u6cd5"},"content":{"rendered":"<h1 id=\"mysql-%e4%bc%ba%e6%9c%8d%e5%99%a8%e7%99%bc%e7%8f%be%e5%a4%a7%e9%87%8ftime_wait%e8%a7%a3%e6%b1%ba%e8%be%a6%e6%b3%95-oBhqMMXcaK\">MySQL \u4f3a\u670d\u5668\u767c\u73fe\u5927\u91cfTIME_WAIT\u89e3\u6c7a\u8fa6\u6cd5<\/h1>\n<p>\u5728\u904b\u884cMySQL\u4f3a\u670d\u5668\u7684\u904e\u7a0b\u4e2d\uff0c\u7ba1\u7406\u8005\u7d93\u5e38\u6703\u9047\u5230TIME_WAIT\u72c0\u614b\u7684\u9023\u63a5\u3002\u9019\u7a2e\u72c0\u614b\u662fTCP\u5354\u8b70\u7684\u4e00\u90e8\u5206\uff0c\u7576\u4e00\u500b\u9023\u63a5\u95dc\u9589\u5f8c\uff0c\u7cfb\u7d71\u6703\u5c07\u5176\u4fdd\u6301\u5728TIME_WAIT\u72c0\u614b\u4e00\u6bb5\u6642\u9593\uff0c\u4ee5\u78ba\u4fdd\u6240\u6709\u7684\u6578\u64da\u5305\u90fd\u80fd\u6b63\u78ba\u50b3\u9001\u3002\u96d6\u7136\u9019\u662f\u6b63\u5e38\u7684\u884c\u70ba\uff0c\u4f46\u7576TIME_WAIT\u7684\u6578\u91cf\u904e\u591a\u6642\uff0c\u53ef\u80fd\u6703\u5f71\u97ff\u4f3a\u670d\u5668\u7684\u6027\u80fd\uff0c\u7279\u5225\u662f\u5728\u9ad8\u6d41\u91cf\u7684\u74b0\u5883\u4e2d\u3002<\/p>\n<h2 id=\"time_wait%e7%9a%84%e5%bd%b1%e9%9f%bf-oBhqMMXcaK\">TIME_WAIT\u7684\u5f71\u97ff<\/h2>\n<p>TIME_WAIT\u72c0\u614b\u7684\u4e3b\u8981\u5f71\u97ff\u5728\u65bc\u5b83\u6703\u4f54\u7528\u7cfb\u7d71\u7684\u7aef\u53e3\u8cc7\u6e90\u3002\u6bcf\u500bTCP\u9023\u63a5\u90fd\u9700\u8981\u4e00\u500b\u552f\u4e00\u7684\u7aef\u53e3\u865f\uff0c\u7576TIME_WAIT\u72c0\u614b\u7684\u9023\u63a5\u6578\u91cf\u904e\u591a\u6642\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4\u65b0\u7684\u9023\u63a5\u7121\u6cd5\u5efa\u7acb\uff0c\u5f9e\u800c\u5f71\u97ff\u61c9\u7528\u7a0b\u5e8f\u7684\u53ef\u7528\u6027\u548c\u6027\u80fd\u3002<\/p>\n<h2 id=\"%e5%a6%82%e4%bd%95%e6%aa%a2%e6%9f%a5time_wait%e7%9a%84%e6%95%b8%e9%87%8f-oBhqMMXcaK\">\u5982\u4f55\u6aa2\u67e5TIME_WAIT\u7684\u6578\u91cf<\/h2>\n<p>\u8981\u6aa2\u67e5\u4f3a\u670d\u5668\u4e0aTIME_WAIT\u7684\u6578\u91cf\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\uff1a<\/p>\n<pre><code>netstat -an | grep TIME_WAIT | wc -l<\/code><\/pre>\n<p>\u9019\u689d\u547d\u4ee4\u6703\u986f\u793a\u7576\u524d\u8655\u65bcTIME_WAIT\u72c0\u614b\u7684\u9023\u63a5\u6578\u91cf\u3002\u6839\u64da\u5be6\u969b\u60c5\u6cc1\uff0c\u7ba1\u7406\u8005\u53ef\u4ee5\u6c7a\u5b9a\u662f\u5426\u9700\u8981\u9032\u884c\u8abf\u6574\u3002<\/p>\n<h2 id=\"%e8%a7%a3%e6%b1%batime_wait%e5%95%8f%e9%a1%8c%e7%9a%84%e6%96%b9%e6%b3%95-oBhqMMXcaK\">\u89e3\u6c7aTIME_WAIT\u554f\u984c\u7684\u65b9\u6cd5<\/h2>\n<h3 id=\"1-%e8%aa%bf%e6%95%b4tcp%e5%8f%83%e6%95%b8-oBhqMMXcaK\">1. \u8abf\u6574TCP\u53c3\u6578<\/h3>\n<p>\u53ef\u4ee5\u901a\u904e\u8abf\u6574\u7cfb\u7d71\u7684TCP\u53c3\u6578\u4f86\u6e1b\u5c11TIME_WAIT\u7684\u6301\u7e8c\u6642\u9593\u3002\u9019\u53ef\u4ee5\u901a\u904e\u4fee\u6539\u7cfb\u7d71\u914d\u7f6e\u6587\u4ef6\u4f86\u5be6\u73fe\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u53c3\u6578\uff1a<\/p>\n<ul>\n<li><code>net.ipv4.tcp_fin_timeout<\/code>: \u6b64\u53c3\u6578\u63a7\u5236TIME_WAIT\u72c0\u614b\u7684\u6301\u7e8c\u6642\u9593\uff0c\u9ed8\u8a8d\u503c\u901a\u5e38\u70ba60\u79d2\u3002\u53ef\u4ee5\u6839\u64da\u9700\u8981\u5c07\u5176\u6e1b\u5c11\uff0c\u4f8b\u5982\u8a2d\u7f6e\u70ba30\u79d2\uff1a<\/li>\n<\/ul>\n<pre><code>echo 30 &gt; \/proc\/sys\/net\/ipv4\/tcp_fin_timeout<\/code><\/pre>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8so_reuseaddr%e9%81%b8%e9%a0%85-oBhqMMXcaK\">2. \u4f7f\u7528SO_REUSEADDR\u9078\u9805<\/h3>\n<p>\u5728\u61c9\u7528\u7a0b\u5e8f\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528SO_REUSEADDR\u9078\u9805\u4f86\u5141\u8a31\u91cd\u7528TIME_WAIT\u72c0\u614b\u7684\u7aef\u53e3\u3002\u9019\u6a23\u53ef\u4ee5\u5728\u7aef\u53e3\u4ecd\u7136\u8655\u65bcTIME_WAIT\u72c0\u614b\u6642\uff0c\u5141\u8a31\u65b0\u7684\u9023\u63a5\u4f7f\u7528\u8a72\u7aef\u53e3\u3002\u4ee5\u4e0b\u662f\u5982\u4f55\u5728Java\u4e2d\u8a2d\u7f6e\u6b64\u9078\u9805\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>ServerSocket serverSocket = new ServerSocket(port);\nserverSocket.setReuseAddress(true);<\/code><\/pre>\n<h3 id=\"3-%e5%a2%9e%e5%8a%a0%e5%8f%af%e7%94%a8%e7%ab%af%e5%8f%a3%e7%af%84%e5%9c%8d-oBhqMMXcaK\">3. \u589e\u52a0\u53ef\u7528\u7aef\u53e3\u7bc4\u570d<\/h3>\n<p>\u901a\u904e\u589e\u52a0\u53ef\u7528\u7684\u7aef\u53e3\u7bc4\u570d\uff0c\u53ef\u4ee5\u6e1b\u5c11\u56e0\u7aef\u53e3\u8017\u76e1\u800c\u5c0e\u81f4\u7684\u554f\u984c\u3002\u53ef\u4ee5\u901a\u904e\u4ee5\u4e0b\u547d\u4ee4\u4f86\u6aa2\u67e5\u548c\u8a2d\u7f6e\u53ef\u7528\u7aef\u53e3\u7bc4\u570d\uff1a<\/p>\n<pre><code>sysctl net.ipv4.ip_local_port_range<\/code><\/pre>\n<p>\u9ed8\u8a8d\u7bc4\u570d\u901a\u5e38\u662f32768\u523060999\uff0c\u53ef\u4ee5\u6839\u64da\u9700\u8981\u9032\u884c\u8abf\u6574\u3002<\/p>\n<h3 id=\"4-%e4%bd%bf%e7%94%a8%e8%b2%a0%e8%bc%89%e5%9d%87%e8%a1%a1-oBhqMMXcaK\">4. \u4f7f\u7528\u8ca0\u8f09\u5747\u8861<\/h3>\n<p>\u5728\u9ad8\u6d41\u91cf\u7684\u74b0\u5883\u4e2d\uff0c\u4f7f\u7528\u8ca0\u8f09\u5747\u8861\u5668\u53ef\u4ee5\u6709\u6548\u5730\u5206\u6563\u6d41\u91cf\uff0c\u6e1b\u5c11\u55ae\u500b\u4f3a\u670d\u5668\u7684\u8ca0\u64d4\uff0c\u5f9e\u800c\u964d\u4f4eTIME_WAIT\u7684\u6578\u91cf\u3002\u9019\u6a23\u53ef\u4ee5\u63d0\u9ad8\u6574\u9ad4\u7cfb\u7d71\u7684\u7a69\u5b9a\u6027\u548c\u6027\u80fd\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-oBhqMMXcaK\">\u7e3d\u7d50<\/h2>\n<p>TIME_WAIT\u72c0\u614b\u662fTCP\u5354\u8b70\u7684\u4e00\u90e8\u5206\uff0c\u96d6\u7136\u5b83\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\u662f\u5fc5\u8981\u7684\uff0c\u4f46\u904e\u591a\u7684TIME_WAIT\u9023\u63a5\u6703\u5f71\u97ffMySQL\u4f3a\u670d\u5668\u7684\u6027\u80fd\u3002\u901a\u904e\u8abf\u6574TCP\u53c3\u6578\u3001\u4f7f\u7528SO_REUSEADDR\u9078\u9805\u3001\u589e\u52a0\u53ef\u7528\u7aef\u53e3\u7bc4\u570d\u4ee5\u53ca\u4f7f\u7528\u8ca0\u8f09\u5747\u8861\u7b49\u65b9\u6cd5\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u6e1b\u5c11TIME_WAIT\u7684\u5f71\u97ff\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u80fd\u7684\u61c9\u7528\uff0c\u9078\u64c7\u5408\u9069\u7684<a href=\"https:\/\/server.hk\">VPS<\/a>\u89e3\u6c7a\u65b9\u6848\u4e5f\u662f\u81f3\u95dc\u91cd\u8981\u7684\uff0c\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u4f3a\u670d\u5668\u5728\u9ad8\u6d41\u91cf\u60c5\u6cc1\u4e0b\u7684\u7a69\u5b9a\u904b\u884c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22MySQL\u4f3a\u670d\u5668\u4e2d\u5927\u91cfTIME_WAIT\u72c0\u614b\u7684\u89e3\u6c7a\u8fa6\u6cd5\uff0c\u63d0\u5347\u6027\u80fd\u8207\u9023\u63a5\u7ba1\u7406\uff0c\u78ba\u4fdd\u7cfb\u7d71\u7a69\u5b9a\u904b\u884c\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-75976","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/75976","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=75976"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/75976\/revisions"}],"predecessor-version":[{"id":75977,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/75976\/revisions\/75977"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=75976"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=75976"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=75976"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}