{"id":50348,"date":"2023-07-13T18:59:49","date_gmt":"2023-07-29T15:32:51","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e8%bf%87%e5%8e%bb%e6%88%91%e4%bb%ac%e5%85%ac%e5%8f%b8%e4%bd%bf%e7%94%a8%e7%9a%84sysctl%e5%b7%b2%e7%bb%8f%e8%bf%9b%e4%b8%80%e6%ad%a5%e6%94%b9%e8%89%af%e3%80%82\/"},"modified":"2024-04-30T13:25:21","modified_gmt":"2024-04-30T05:25:21","slug":"%e8%bf%87%e5%8e%bb%e6%88%91%e4%bb%ac%e5%85%ac%e5%8f%b8%e4%bd%bf%e7%94%a8%e7%9a%84sysctl%e5%b7%b2%e7%bb%8f%e8%bf%9b%e4%b8%80%e6%ad%a5%e6%94%b9%e8%89%af%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e8%bf%87%e5%8e%bb%e6%88%91%e4%bb%ac%e5%85%ac%e5%8f%b8%e4%bd%bf%e7%94%a8%e7%9a%84sysctl%e5%b7%b2%e7%bb%8f%e8%bf%9b%e4%b8%80%e6%ad%a5%e6%94%b9%e8%89%af%e3%80%82\/","title":{"rendered":"\u8fc7\u53bb\u6211\u4eec\u516c\u53f8\u4f7f\u7528\u7684sysctl\u5df2\u7ecf\u8fdb\u4e00\u6b65\u6539\u826f"},"content":{"rendered":"<p>\u6211\u5728\u5546\u7528\u73af\u5883\u4e2d\u6240\u914d\u7f6e\u7684\u8bbe\u7f6e\u3002<br \/>\n\u56e0\u4e3a\u5168\u90e8\u90fd\u662f\u81ea\u5df1\u7814\u7a76\u548c\u8bbe\u7f6e\u7684\uff0c<br \/>\n\u6240\u4ee5\u6211\u4f1a\u516c\u5f00\u5305\u62ec\u53c2\u8003\u7684\u7f51\u7ad9\u5728\u5185\u7684\u6240\u6709\u5185\u5bb9\u3002<br \/>\n\u57fa\u4e8eCentOS6\u8fdb\u884c\u8bbe\u60f3\u3002<br \/>\n\u5728\u6b64\u4e4b\u540e\uff0c\u8bf7\u53e6\u884c\u67e5\u96053.0\u6216\u66f4\u65b0\u7248\u672c\u5185\u6838\u7684\u529f\u80fd\u3002<\/p>\n<p>\u8bf7\u53c2\u8003\u300aCentOS\u7528\u6237\u5728Ubuntu 16.04\u4e0a\u642d\u5efaMySQL\u5e76\u9677\u5165\u56f0\u5883\uff08\u5b8c\u5168\u8c03\u4f18\u7248\uff09\u300b\uff0c\u8fdb\u884csysctl\u4ee5\u5916\u7684\u8bbe\u7f6e\u3002<\/p>\n<h2>\u4e0d\u7ba1\u670d\u52a1\u5668\uff0c\u90fd\u53ef\u4ee5\u8fdb\u884c\u8bbe\u7f6e\u3002<\/h2>\n<h3>\u7981\u7528IPv6<\/h3>\n<p>\u5982\u4f55\u7981\u7528IPv6\uff1f- \u5e38\u89c1\u95ee\u9898\/ CentOS6 &#8211; CentOS Wiki<\/p>\n<pre class=\"post-pre\"><code><span class=\"py\">net.ipv6.conf.all.disable_ipv6<\/span> <span class=\"p\">=<\/span> <span class=\"s\">1<\/span>\r\n<span class=\"py\">net.ipv6.conf.default.disable_ipv6<\/span> <span class=\"p\">=<\/span> <span class=\"s\">1<\/span>\r\n<\/code><\/pre>\n<h3>\u5c3d\u529b\u4e0d\u8fdb\u884c\u4e92\u6362<\/h3>\n<p>\u65b0\u5185\u6838\u4e2dOOM\u548cvm.swappiness=0\u7684\u5173\u7cfb\uff1b\u5bfc\u81f4MySQL\u670d\u52a1\u5668\u8fdb\u7a0b\u7ec8\u6b62\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"py\">vm.swappiness<\/span> <span class=\"p\">=<\/span> <span class=\"s\">1<\/span>\r\n<\/code><\/pre>\n<p>\u4ece\u5185\u68384.6\u7248\u672c\u5f00\u59cb\uff0c\u53ef\u80fd\u6ca1\u6709\u95ee\u9898\uff0c\u4f46\u76ee\u524d\u672a\u8c03\u67e5\u3002<\/p>\n<h3>\u63a7\u5236\u5185\u5b58\u4f7f\u7528\u91cf<\/h3>\n<p>\u5173\u4e8evm.overcommit_memory\u7684\u5185\u5bb9<\/p>\n<pre class=\"post-pre\"><code><span class=\"py\">vm.overcommit_memory<\/span><span class=\"p\">=<\/span><span class=\"s\">1<\/span>\r\n<\/code><\/pre>\n<p>\u53ea\u8981\u80fd\u591f\u6709\u6548\u63a7\u5236\uff0c\u9009\u62e91\u662f\u6700\u597d\u7684\u3002<br \/>\n\u5982\u679c\u6709\u591a\u4e2a\u5e94\u7528\u5728\u8fd0\u884c\uff0c\u4e0d\u5f97\u4e0d\u9009\u62e92\u3002<\/p>\n<h3>TCP\u91cd\u4f20\u6b21\u6570<\/h3>\n<p>\u5173\u4e8eWeb\u5e7f\u544a\u57fa\u7840\u8bbe\u65bd(\u7b2c5\u90e8\u5206)\uff1aLinux\u7684TCP\u91cd\u4f20\u7b97\u6cd5\u548c\u79fb\u52a8\u7f51\u7edc\u7684\u4e0d\u517c\u5bb9\u6027 | \u591a\u811a.com<\/p>\n<pre class=\"post-pre\"><code><span class=\"py\">net.ipv4.tcp_orphan_retries<\/span> <span class=\"p\">=<\/span> <span class=\"s\">3<\/span>\r\n<\/code><\/pre>\n<h3>\u4fdd\u6301\u8fde\u63a5\u524d\u7684\u901a\u4fe1\u72b6\u51b5\u786e\u8ba4<\/h3>\n<p>\u9ad8\u6027\u80fd\u7684\u7f51\u7edc\u6d4f\u89c8-\u7231\u4e0e\u52c7\u6c14\u4e0e\u7f50\u88c5\u5564\u9152<\/p>\n<pre class=\"post-pre\"><code><span class=\"py\">net.ipv4.tcp_slow_start_after_idle<\/span> <span class=\"p\">=<\/span> <span class=\"s\">0<\/span>\r\n<\/code><\/pre>\n<h3>SYN\u6d2a\u6cdb\u653b\u51fb\u9632\u5fa1\u63aa\u65bd<\/h3>\n<p>\u542c\u89c9\u80cc\u666f \u30103.6\u3011-Linux\u5185\u6838\u7b14\u8bb0<\/p>\n<pre class=\"post-pre\"><code><span class=\"py\">net.ipv4.tcp_syncookies<\/span> <span class=\"p\">=<\/span> <span class=\"s\">1<\/span>\r\n<\/code><\/pre>\n<h3>\u6ca1\u6709\u5bf9\u624b\u4fbf\u53d8\u6210\u4e86ESTABLISHED\u3002<\/h3>\n<p>TCP\u7aef\u53e3\u5df2\u6210\u4e3aESTABLISHED\u72b6\u6001\uff0c\u5c3d\u7ba1\u6ca1\u6709\u5bf9\u65b9\u5b58\u5728 &#8211; @tmtms\u7684\u7b14\u8bb0<\/p>\n<pre class=\"post-pre\"><code><span class=\"py\">net.ipv4.tcp_abort_on_overflow<\/span><span class=\"p\">=<\/span><span class=\"s\">1<\/span>\r\n<\/code><\/pre>\n<h3>\u7981\u7528TCP\u9009\u9879<\/h3>\n<p>\u4e86\uff0c\u4e3a\u4e86\u89e3\u5176\u5371\u9669\u6027<\/p>\n<pre class=\"post-pre\"><code><span class=\"py\">net.ipv4.tcp_tw_reuse<\/span> <span class=\"p\">=<\/span> <span class=\"s\">1<\/span>\r\n<span class=\"py\">net.ipv4.tcp_tw_recycle<\/span> <span class=\"p\">=<\/span> <span class=\"s\">0<\/span>\r\n<\/code><\/pre>\n<h3>\u4e5f\u8bb8\u5c06Oracle\u7684\u8bbe\u7f6e\u76f4\u63a5\u653e\u5165\u4f1a\u6bd4\u8f83\u597d<\/h3>\n<p>\u5b89\u88c5Oracle\u6570\u636e\u5e93\u8f6f\u4ef6<\/p>\n<pre class=\"post-pre\"><code>kernel.sem = 250 32000 100 128\r\nnet.core.rmem_default = 4194304\r\nnet.core.rmem_max = 4194304\r\nnet.core.wmem_default = 262144\r\nnet.core.wmem_max = 1048576\r\nfs.aio-max-nr = 1048576\r\nfs.file-max = 681574\r\n<\/code><\/pre>\n<h3>\u5982\u679c\u4f7f\u7528NoSQL\u6216\u8005\u67091Gbps\u4ee5\u4e0a\u7684\u6d41\u91cf\uff0c\u53ef\u4ee5\u9009\u62e9\u57fa\u4e8eCassandra\u8fdb\u884c\u5f00\u53d1\u3002<\/h3>\n<p># Apache Cassandra\u7684\u63a8\u8350\u751f\u4ea7\u8bbe\u7f6e<\/p>\n<pre class=\"post-pre\"><code>net.core.rmem_max = 16777216\r\nnet.core.wmem_max = 16777216\r\nnet.core.rmem_default = 16777216\r\nnet.core.wmem_default = 16777216\r\nnet.core.optmem_max = 40960\r\nnet.ipv4.tcp_rmem = 4096 87380 16777216\r\nnet.ipv4.tcp_wmem = 4096 65536 16777216\r\nvm.max_map_count = 1048575\r\n<\/code><\/pre>\n<h3>\u5176\u4ed6\u8bbe\u7f6e<\/h3>\n<p>\uff20IT\uff1a\u5728Linux\u4e0a\u6709\u4e00\u4e9b\u65e0\u6cd5\u663e\u793a\u7684\u7f51\u7ad9\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"py\">net.ipv4.tcp_ecn<\/span> <span class=\"p\">=<\/span> <span class=\"s\">1<\/span>\r\n<\/code><\/pre>\n<p>\u4e0d\u592a\u4e3a\u4eba\u6240\u77e5\u7684\u8bbe\u7f6e- Linux\u9ad8\u7ea7\u8def\u7531\u548c\u6d41\u91cf\u63a7\u5236\u6307\u5357<\/p>\n<pre class=\"post-pre\"><code><span class=\"py\">net.ipv4.tcp_rfc1337<\/span> <span class=\"p\">=<\/span> <span class=\"s\">1<\/span>\r\n<\/code><\/pre>\n<p>Linux \u5728\u5957\u63a5\u5b57\u529f\u80fd\u65b9\u9762\u7684\u6539\u8fdb<\/p>\n<pre class=\"post-pre\"><code><span class=\"py\">net.ipv4.tcp_sack<\/span> <span class=\"p\">=<\/span> <span class=\"s\">1<\/span>\r\n<span class=\"py\">net.ipv4.tcp_fack<\/span> <span class=\"p\">=<\/span> <span class=\"s\">1<\/span>\r\n<\/code><\/pre>\n<h3>\u53d1\u9001\u4f7f\u7528TCP\u534f\u8bae\u7684\u7aef\u53e3\u8303\u56f4<\/h3>\n<pre class=\"post-pre\"><code><span class=\"c\">#NAT\u3001\u30ea\u30d0\u30fc\u30b9\u30d7\u30ed\u30af\u30b7\u7528\r\n#net.ipv4.ip_local_port_range = 1024 65000\r\n<\/span><\/code><\/pre>\n<h1>\u6700\u597d\u6839\u636e\u670d\u52a1\u5668\u7c7b\u578b\u8fdb\u884c\u914d\u7f6e\u66f4\u6539\u3002<\/h1>\n<h3>\u8bbe\u7f6eTCP\u7684\u91cd\u4f20\u6b21\u6570<\/h3>\n<p>\u6839\u636e\u6545\u969c\u8f6c\u79fb\u6240\u9700\u7684\u65f6\u95f4\u8fdb\u884c\u8bbe\u8ba1\uff0c\u5982\u679c\u4e0d\u9700\u8981\u6545\u969c\u8f6c\u79fb\uff0c\u5219\u6700\u591a\u5141\u8bb82\u6b21\u3002<br \/>\n# Linux\u7684TCP SYN\u91cd\u4f20\u95f4\u9694\u7684\u521d\u59cb\u503c\u5df2\u4ece3\u79d2\u66f4\u6539\u4e3a1\u79d2- \u6765\u81ea\u66fe\u7ecf\u9a7e\u9a76RX-7\u7684\u5306\u5fd9\u65e5\u5b50<\/p>\n<pre class=\"post-pre\"><code><span class=\"py\">net.ipv4.tcp_syn_retries<\/span> <span class=\"p\">=<\/span> <span class=\"s\">2<\/span>\r\n<span class=\"py\">net.ipv4.tcp_synack_retries<\/span> <span class=\"p\">=<\/span> <span class=\"s\">2<\/span>\r\n<\/code><\/pre>\n<h3>\u4fdd\u6301\u8fde\u63a5\u7684\u8bbe\u7f6e<\/h3>\n<p>\u5173\u95edCLOSE_WAIT\u4f1a\u8bdd\u7684\u65b9\u6cd5-\u798f\u4e0a\u5e7f\u7684\u535a\u5ba2<\/p>\n<pre class=\"post-pre\"><code><span class=\"c\">#\u30d5\u30ed\u30f3\u30c8\u7528\u30b5\u30fc\u30d0(PC)\r\n#net.ipv4.tcp_keepalive_time = 5\r\n#net.ipv4.tcp_keepalive_intvl = 2\r\n#net.ipv4.tcp_keepalive_probes = 5\r\n<\/span>\r\n<span class=\"c\">#\u30d5\u30ed\u30f3\u30c8\u7528\u30b5\u30fc\u30d0(mobile)\r\n#net.ipv4.tcp_keepalive_time = 10\r\n#net.ipv4.tcp_keepalive_intvl = 2\r\n#net.ipv4.tcp_keepalive_probes = 10\r\n<\/span>\r\n<span class=\"c\">#\u305d\u308c\u4ee5\u5916\u306e\u30b5\u30fc\u30d0\r\n#net.ipv4.tcp_keepalive_time = 60\r\n#net.ipv4.tcp_keepalive_intvl = 2\r\n#net.ipv4.tcp_keepalive_probes = 60\r\n<\/span><\/code><\/pre>\n<h3>\u5f3a\u5236\u65ad\u5f00\u8fde\u63a5\u5728FIN\u4e0a\u3002<\/h3>\n<p>\u90fd\u662f\u56e0\u4e3aTIME_WAIT\u7684\u95ee\u9898\uff01- Qiita<\/p>\n<pre class=\"post-pre\"><code><span class=\"py\">net.ipv4.tcp_fin_timeout<\/span> <span class=\"p\">=<\/span> <span class=\"s\">30<\/span>\r\n<\/code><\/pre>\n<h3>\u9ad8\u8d1f\u8377\u65f6\u7684\u8fd0\u884c\u7a33\u5b9a<\/h3>\n<p># DSAS\u5f00\u53d1\u8005\u7684\u623f\u95f4\uff1a\u5982\u4f55\u627e\u5230\u9ad8\u8d1f\u8377\u7f51\u7ad9\u7684\u74f6\u9888<br \/>\n# \u7814\u7a76Linux\u7684TCP\/IP\u5b9e\u73b0 &#8211; Nyant\u7684\u65e5\u8bb0<\/p>\n<pre class=\"post-pre\"><code><span class=\"py\">net.core.netdev_max_backlog<\/span> <span class=\"p\">=<\/span> <span class=\"s\">4096<\/span>\r\n<span class=\"py\">net.core.somaxconn<\/span> <span class=\"p\">=<\/span> <span class=\"s\">4096<\/span>\r\n<span class=\"py\">net.ipv4.tcp_max_syn_backlog<\/span> <span class=\"p\">=<\/span> <span class=\"s\">4096<\/span>\r\n<\/code><\/pre>\n<h3>\u6ce8\u91cd\u541e\u5410\u91cf\uff08\u672a\u7ecf\u9a8c\u8bc1\uff09<\/h3>\n<p>\u5728Linux\u4e2d\u6539\u8fdb\u4e86\u5957\u63a5\u5b57\u529f\u80fd\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"py\">net.ipv4.tcp_low_latency<\/span> <span class=\"p\">=<\/span> <span class=\"s\">0<\/span>\r\n<\/code><\/pre>\n<h3>\u5982\u679c\u662f\u6d89\u53ca\u5230\u78c1\u76d8\u6027\u80fd\u7684\u4e2d\u95f4\u4ef6\uff0c\u5728\u8c03\u6574\u4e0a\u53ef\u80fd\u4f1a\u4ea7\u751f\u6548\u679c\uff08\u672a\u7ecf\u9a8c\u8bc1\u7684\uff09\u3002<\/h3>\n<p>\u66f4\u597d\u7684Linux\u78c1\u76d8\u7f13\u5b58\u548c\u6027\u80fd\uff0c\u4f7f\u7528vm.dirty_ratio\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"c\">#vm.dirty_background_ratio = 5\r\n#vm.dirty_ratio = 80\r\n<\/span><\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u6211\u5728\u5546\u7528\u73af\u5883\u4e2d\u6240\u914d\u7f6e\u7684\u8bbe\u7f6e\u3002 \u56e0\u4e3a\u5168\u90e8\u90fd\u662f\u81ea\u5df1\u7814\u7a76\u548c\u8bbe\u7f6e\u7684\uff0c \u6240\u4ee5\u6211\u4f1a\u516c\u5f00\u5305\u62ec\u53c2\u8003\u7684\u7f51\u7ad9\u5728\u5185\u7684\u6240\u6709\u5185\u5bb9\u3002 \u57fa\u4e8e [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-50348","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u8fc7\u53bb\u6211\u4eec\u516c\u53f8\u4f7f\u7528\u7684sysctl\u5df2\u7ecf\u8fdb\u4e00\u6b65\u6539\u826f - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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