{"id":229,"date":"2017-11-22T04:34:59","date_gmt":"2017-11-22T04:34:59","guid":{"rendered":""},"modified":"2024-11-04T11:50:55","modified_gmt":"2024-11-04T03:50:55","slug":"%e8%bd%ac-linux%e4%b8%8b%e8%a7%a3%e5%86%b3time_wait%e8%bf%9e%e6%8e%a5%e8%bf%87%e5%a4%9a","status":"publish","type":"post","link":"http:\/\/weizn.net\/?p=229","title":{"rendered":"[\u8f6c] Linux\u4e0b\u89e3\u51b3time_wait\u8fde\u63a5\u8fc7\u591a"},"content":{"rendered":"\t\t
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1\u3001\u95ee\u9898\u63cf\u8ff0\uff1a\u9ad8\u8d1f\u8f7d\u4e0b\uff0c\u7cfb\u7edf\u54cd\u5e94\u53d8\u6162\uff0c\u5e76\u51fa\u73b0\u8d85\u65f6\u6216\u5931\u8bef\u5931\u8d25\u60c5\u51b5\uff0cTIME_WAIT\u79ef\u538b<\/span><\/p>\n

2\u3001\u95ee\u9898\u5f71\u54cd\uff1a\u7cfb\u7edf\u8bbe\u7f6e\u7684\u81ea\u52a8\u56de\u6536\u65f6\u95f4\u4e3a60s,\u4f46\u5728\u538b\u6d4b\u4e2d\u5982\u679c\u6d89\u53ca\u7684\u670d\u52a1\u8f83\u591a\u7684\u60c5\u51b5\u4e0b\uff0c\u6bd4\u5982\u8fd9\u6b21\u4ee5100TPS\u538b\u529b\u5355\u6d4b1\u4e2a\u63a5\u53e3\uff0c\u6d89\u53ca4-6\u4e2a\u670d\u52a1\uff0c\u6bcf\u79d2\u5c31\u4f1a\u521b\u5efa400+\u7684\u8fde\u63a5\uff0c1\u5206\u949f\u5c31\u662f2.4\u4e07\u7684\u8fde\u63a5\uff0c\u7cfb\u7edf\u65e0\u6cd5\u53ca\u65f6\u56de\u6536\uff0c\u538b\u6d4b\u4e24\u5206\u949f\u540e\uff0c\u65b0\u7684\u8bf7\u6c42\u8fc7\u6765\uff0c\u65e0\u6cd5\u521b\u5efa\u8fde\u63a5\u6216\u65e0\u6cd5\u53ca\u65f6\u521b\u5efa\u8fde\u63a5\uff0c\u5bfc\u81f4\u8bf7\u6c42\u5931\u8d25\uff0c\u4e25\u91cd\u65f6\u4f1a\u51fa\u73b0\u6574\u4e2a\u670d\u52a1\u5668\u6302\u6b7b\uff08\u65b0\u6765\u7684\u8bf7\u6c42\u65e0\u6cd5\u521b\u5efa\u8fde\u63a5\uff09\u3002<\/span><\/p>\n

3\u3001\u95ee\u9898\u539f\u56e0\uff1aLinux\u73af\u5883\u914d\u7f6e\u5b58\u5728\u95ee\u9898\uff08\u540echeck\u6240\u6709\u6d4b\u8bd5\u73af\u5883\u5747\u672a\u914d\u7f6e\uff0c\u5305\u62ec\u751f\u4ea7\u73af\u5883\uff09<\/span><\/p>\n

4\u3001\u95ee\u9898\u80cc\u666f\uff1a\u5728\u5bf9A\u63a5\u53e3\u8fdb\u884c\u8d1f\u8f7d\u6d4b\u8bd5\u65f6\uff0c\u5728\u4e00\u5b9a\u538b\u529b\u4e0b\uff0c\u51fa\u73b0\u4e86\u6bd4\u8f83\u8be1\u5f02\u7684\u73b0\u8c61\uff1a\u5728100TPS\u538b\u529b\u4e0b\uff0c\u5f00\u59cb\u54cd\u5e94\u65f6\u95f4\u5f88\u5feb\uff0c\u90fd\u57280.3s\u5de6\u53f3\uff0c\u4f46\u538b\u6d4b\u4e0d\u5230\u4e00\u5206\u949f\u5f00\u59cb\u51fa\u73b0\u5927\u91cf\u4e8b\u52a1\u5931\u8d25\uff0c\u54cd\u5e94\u65f6\u95f4\u500d\u589e\uff0c\u6700\u540e\u7cfb\u7edf\u751a\u81f3\u51fa\u73b0\u201c\u6302\u6b7b\u201d\u3002<\/span><\/p>\n

5\u3001\u95ee\u9898\u89e3\u51b3\uff1a\u589e\u52a0\u4ee5\u4e0b\uff0c<\/span>
[root@aaa1 ~]# vim \/etc\/sysctl.conf<\/span>
net.ipv4.tcp_tw_reuse = 1<\/span>
\u8fd9\u4e2a\u662f\u91cd\u70b9\uff0c\u8868\u793a\u5f00\u542f\u91cd\u7528\u3002\u5141\u8bb8\u5c06TIME-WAIT sockets\u91cd\u65b0\u7528\u4e8e\u65b0\u7684TCP\u8fde\u63a5\uff0c\u9ed8\u8ba4\u4e3a0\uff0c\u8868\u793a\u5173\u95ed\uff1b<\/span>
\u95ee\u9898\u5b9a\u4f4d\u53ca\u9a8c\u8bc1\uff1a<\/span>
netstat -n | awk ‘\/^tcp\/ {++S[$NF]} END {for(a in S) print a, S[a]}’<\/span>
TIME_WAIT 41735<\/span>
CLOSE_WAIT 145<\/span>
FIN_WAIT2 3<\/span>
ESTABLISHED 413<\/span><\/p>\n

\u4e0d\u5230\u4e24\u5206\u949f\uff0ctime_wait\u79ef\u538b\u52304\u4e07\uff0c\u6700\u540e\u5bfc\u81f4\u65e0\u6cd5\u521b\u5efa\u65b0\u7684\u8fde\u63a5\uff0c\u4e8b\u52a1\u5168\u90e8\u5931\u8d25\u3002<\/span>
\u6dfb\u52a0\u53c2\u6570\u540e\uff0c\u518d\u6b21\u9a8c\u8bc1\uff0c\u4ee5\u4e0b\u662f\u538b\u6d4b\u5341\u5206\u949f\u4e2d\u7684time_wait\u6570\u636e\uff0c\u4e00\u81f4\u4fdd\u6301\u57285000\u4ee5\u4e0b\uff0c\u800c\u4e14\u7531\u4e8e\u4e0d\u9700\u8981\u91cd\u65b0\u521b\u5efa\u8fde\u63a5\uff0c\u76f4\u63a5\u7528\u5df2\u5b58\u5728\u7684\uff0c\u51cf\u5c11\u4e86\u8d44\u6e90\u5f00\u9500\uff0c120TPS\u6bd4\u4e4b\u524d\u538b\u6d4b100TPS\u7684\u6027\u80fd\u8981\u597d\u5f88\u591a\u3002<\/span><\/p>\n

netstat -n | awk ‘\/^tcp\/ {++S[$NF]} END {for(a in S) print a, S[a]}’<\/span>
TIME_WAIT 4500<\/span>
CLOSE_WAIT 7<\/span>
ESTABLISHED 642<\/span><\/p>\n

***************************\u9644\u4e0a\u76f8\u5173\u53c2\u6570\u7684\u8be6\u89e3****************************<\/span>
1\u3001\u5728\u670d\u52a1\u5668\u4e2d\u53ef\u8f93\u5165\u5982\u4e0b\u547d\u4ee4:<\/span>
#netstat -n | awk ‘\/^tcp\/ {++S[$NF]} END {for(a in S) print a, S[a]}’<\/span>
LAST_ACK 14<\/span>
SYN_RECV 348<\/span>
ESTABLISHED 70<\/span>
FIN_WAIT1 229<\/span>
FIN_WAIT2 30<\/span>
CLOSING 33<\/span>
TIME_WAIT 18122<\/span><\/p>\n

\u72b6\u6001\uff1a\u63cf\u8ff0<\/span>
CLOSED\uff1a\u65e0\u8fde\u63a5\u662f\u6d3b\u52a8\u7684\u6216\u6b63\u5728\u8fdb\u884c<\/span>
LISTEN\uff1a\u670d\u52a1\u5668\u5728\u7b49\u5f85\u8fdb\u5165\u547c\u53eb<\/span>
SYN_RECV\uff1a\u4e00\u4e2a\u8fde\u63a5\u8bf7\u6c42\u5df2\u7ecf\u5230\u8fbe\uff0c\u7b49\u5f85\u786e\u8ba4<\/span>
SYN_SENT\uff1a\u5e94\u7528\u5df2\u7ecf\u5f00\u59cb\uff0c\u6253\u5f00\u4e00\u4e2a\u8fde\u63a5<\/span>
ESTABLISHED\uff1a\u6b63\u5e38\u6570\u636e\u4f20\u8f93\u72b6\u6001<\/span>
FIN_WAIT1\uff1a\u5e94\u7528\u8bf4\u5b83\u5df2\u7ecf\u5b8c\u6210<\/span>
FIN_WAIT2\uff1a\u53e6\u4e00\u8fb9\u5df2\u540c\u610f\u91ca\u653e<\/span>
ITMED_WAIT\uff1a\u7b49\u5f85\u6240\u6709\u5206\u7ec4\u6b7b\u6389<\/span>
CLOSING\uff1a\u4e24\u8fb9\u540c\u65f6\u5c1d\u8bd5\u5173\u95ed<\/span>
TIME_WAIT\uff1a\u53e6\u4e00\u8fb9\u5df2\u521d\u59cb\u5316\u4e00\u4e2a\u91ca\u653e<\/span>
LAST_ACK\uff1a\u7b49\u5f85\u6240\u6709\u5206\u7ec4\u6b7b\u6389<\/span>
\u4e5f\u5c31\u662f\u8bf4\uff0c\u8fd9\u6761\u547d\u4ee4\u53ef\u4ee5\u628a\u5f53\u524d\u7cfb\u7edf\u7684\u7f51\u7edc\u8fde\u63a5\u72b6\u6001\u5206\u7c7b\u6c47\u603b\u3002<\/span>
\u5982\u53d1\u73b0\u7cfb\u7edf\u5b58\u5728\u5927\u91cfTIME_WAIT\u72b6\u6001\u7684\u8fde\u63a5\uff0c\u901a\u8fc7\u8c03\u6574\u5185\u6838\u53c2\u6570\u89e3\u51b3\u3002<\/span><\/p>\n

2\u3001\u5148\u68c0\u67e5\u4e00\u4e0btime wait\u7684\u503c\uff1a<\/span>
[root@aaa1 ~]# sysctl -a | grep time | grep wait<\/span>
net.ipv4.netfilter.ip_conntrack_tcp_timeout_time_wait = 120<\/span>
net.ipv4.netfilter.ip_conntrack_tcp_timeout_close_wait = 60<\/span>
net.ipv4.netfilter.ip_conntrack_tcp_timeout_fin_wait = 120<\/span><\/p>\n

3\u3001\u4fee\u6539\u7cfb\u7edf\u914d\u7f6e<\/span>
[root@aaa1 ~]# vim \/etc\/sysctl.conf<\/span>
\u589e\u52a0\u4ee5\u4e0b\u51e0\u884c\uff1a\uff08\u8bf7\u6839\u636e\u5b9e\u9645\u9700\u8981\u6dfb\u52a0\uff09<\/span>
net.ipv4.tcp_fin_timeout = 30<\/span>
net.ipv4.tcp_keepalive_time = 1200<\/span>
net.ipv4.tcp_syncookies = 1<\/span>
net.ipv4.tcp_tw_reuse = 1<\/span>
net.ipv4.ip_local_port_range = 1024 65000<\/span>
net.ipv4.tcp_max_syn_backlog = 8192<\/span>
net.ipv4.tcp_max_tw_buckets = 5000<\/span><\/p>\n

\u8bf4\u660e\uff1a<\/span>
net.ipv4.tcp_syncookies = 1 \u8868\u793a\u5f00\u542fSYN Cookies\u3002\u5f53\u51fa\u73b0SYN\u7b49\u5f85\u961f\u5217\u6ea2\u51fa\u65f6\uff0c\u542f\u7528cookies\u6765\u5904\u7406\uff0c\u53ef\u9632\u8303\u5c11\u91cfSYN\u653b\u51fb\uff0c\u9ed8\u8ba4\u4e3a0\uff0c\u8868\u793a\u5173\u95ed\uff1b<\/span>
net.ipv4.tcp_tw_reuse = 1 \u8868\u793a\u5f00\u542f\u91cd\u7528\u3002\u5141\u8bb8\u5c06TIME-WAIT sockets\u91cd\u65b0\u7528\u4e8e\u65b0\u7684TCP\u8fde\u63a5\uff0c\u9ed8\u8ba4\u4e3a0\uff0c\u8868\u793a\u5173\u95ed\uff1b<\/span>
net.ipv4.tcp_fin_timeout = 30 \u8868\u793a\u5982\u679c\u5957\u63a5\u5b57\u7531\u672c\u7aef\u8981\u6c42\u5173\u95ed\uff0c\u8fd9\u4e2a\u53c2\u6570\u51b3\u5b9a\u4e86\u5b83\u4fdd\u6301\u5728FIN-WAIT-2\u72b6\u6001\u7684\u65f6\u95f4\u3002<\/span>
net.ipv4.tcp_keepalive_time = 1200 \u8868\u793a\u5f53keepalive\u8d77\u7528\u7684\u65f6\u5019\uff0cTCP\u53d1\u9001keepalive\u6d88\u606f\u7684\u9891\u5ea6\u3002\u7f3a\u7701\u662f2\u5c0f\u65f6\uff0c\u6539\u4e3a20\u5206\u949f\u3002<\/span>
net.ipv4.ip_local_port_range = 1024 65000 \u8868\u793a\u7528\u4e8e\u5411\u5916\u8fde\u63a5\u7684\u7aef\u53e3\u8303\u56f4\u3002\u7f3a\u7701\u60c5\u51b5\u4e0b\u5f88\u5c0f\uff1a32768\u523061000\uff0c\u6539\u4e3a1024\u523065000\u3002<\/span>
net.ipv4.tcp_max_syn_backlog = 8192 \u8868\u793aSYN\u961f\u5217\u7684\u957f\u5ea6\uff0c\u9ed8\u8ba4\u4e3a1024\uff0c\u52a0\u5927\u961f\u5217\u957f\u5ea6\u4e3a8192\uff0c\u53ef\u4ee5\u5bb9\u7eb3\u66f4\u591a\u7b49\u5f85\u8fde\u63a5\u7684\u7f51\u7edc\u8fde\u63a5\u6570\u3002<\/span>
net.ipv4.tcp_max_tw_buckets = 5000\u8868\u793a\u7cfb\u7edf\u540c\u65f6\u4fdd\u6301TIME_WAIT\u5957\u63a5\u5b57\u7684\u6700\u5927\u6570\u91cf\uff0c\u5982\u679c\u8d85\u8fc7\u8fd9\u4e2a\u6570\u5b57\uff0cTIME_WAIT\u5957\u63a5\u5b57\u5c06\u7acb\u523b\u88ab\u6e05\u9664\u5e76\u6253\u5370\u8b66\u544a\u4fe1\u606f\u3002\u9ed8\u8ba4\u4e3a180000\uff0c\u6539\u4e3a5000\u3002\u5bf9\u4e8eApache\u3001Nginx\u7b49\u670d\u52a1\u5668\uff0c\u4e0a\u51e0\u884c\u7684\u53c2\u6570\u53ef\u4ee5\u5f88\u597d\u5730\u51cf\u5c11TIME_WAIT\u5957\u63a5\u5b57\u6570\u91cf\uff0c\u4f46\u662f\u5bf9\u4e8eSquid\uff0c\u6548\u679c\u5374\u4e0d\u5927\u3002\u6b64\u9879\u53c2\u6570\u53ef\u4ee5\u63a7\u5236TIME_WAIT\u5957\u63a5\u5b57\u7684\u6700\u5927\u6570\u91cf\uff0c\u907f\u514dSquid\u670d\u52a1\u5668\u88ab\u5927\u91cf\u7684TIME_WAIT\u5957\u63a5\u5b57\u62d6\u6b7b\u3002<\/span><\/p>\n

4\u3001\u6267\u884c\u4ee5\u4e0b\u547d\u4ee4\u4f7f\u914d\u7f6e\u751f\u6548\uff1a<\/span>
[root@aaa1 ~]# \/sbin\/sysctl -p<\/span>
<\/span><\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

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2\u3001\u95ee\u9898\u5f71\u54cd\uff1a\u7cfb\u7edf\u8bbe\u7f6e\u7684\u81ea\u52a8\u56de\u6536\u65f6\u95f4\u4e3a60s,\u4f46\u5728\u538b\u6d4b\u4e2d\u5982\u679c\u6d89\u53ca\u7684\u670d\u52a1\u8f83\u591a\u7684\u60c5\u51b5\u4e0b\uff0c\u6bd4\u5982\u8fd9\u6b21\u4ee5100TPS\u538b\u529b\u5355\u6d4b1\u4e2a\u63a5\u53e3\uff0c\u6d89\u53ca4-6\u4e2a\u670d\u52a1\uff0c\u6bcf\u79d2\u5c31\u4f1a\u521b\u5efa400+\u7684\u8fde\u63a5\uff0c1\u5206\u949f\u5c31\u662f2.4\u4e07\u7684\u8fde\u63a5\uff0c\u7cfb\u7edf\u65e0\u6cd5\u53ca\u65f6\u56de\u6536\uff0c\u538b\u6d4b\u4e24\u5206\u949f\u540e\uff0c\u65b0\u7684\u8bf7\u6c42\u8fc7\u6765\uff0c\u65e0\u6cd5\u521b\u5efa\u8fde\u63a5\u6216\u65e0\u6cd5\u53ca\u65f6\u521b\u5efa\u8fde\u63a5\uff0c\u5bfc\u81f4\u8bf7\u6c42\u5931\u8d25\uff0c\u4e25\u91cd\u65f6\u4f1a\u51fa\u73b0\u6574\u4e2a\u670d\u52a1\u5668\u6302\u6b7b…<\/span><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[332],"tags":[],"class_list":["post-229","post","type-post","status-publish","format-standard","hentry"],"yoast_head":"\n[\u8f6c] Linux\u4e0b\u89e3\u51b3time_wait\u8fde\u63a5\u8fc7\u591a - 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