{"id":694,"date":"2022-09-22T14:54:34","date_gmt":"2022-09-22T06:54:34","guid":{"rendered":"https:\/\/frogvps.com\/?p=694"},"modified":"2022-10-10T16:55:27","modified_gmt":"2022-10-10T08:55:27","slug":"zabbix%e7%9b%91%e6%8e%a7linux-tcp%e8%bf%9e%e6%8e%a5%e7%8a%b6%e6%80%81","status":"publish","type":"post","link":"https:\/\/frogvps.com\/?p=694","title":{"rendered":"zabbix\u76d1\u63a7Linux TCP\u8fde\u63a5\u72b6\u6001"},"content":{"rendered":"\n

TCP\uff0c\u5168\u79f0Transfer Control Protocol\uff0c\u4e2d\u6587\u540d\u4e3a\u4f20\u8f93\u63a7\u5236\u534f\u8bae\uff0c\u5b83\u5de5\u4f5c\u5728OSI\u7684\u4f20\u8f93\u5c42\uff0c\u63d0\u4f9b\u9762\u5411\u8fde\u63a5\u7684\u53ef\u9760\u4f20\u8f93\u670d\u52a1\uff0cTCP\u7684\u5de5\u4f5c\u4e3b\u8981\u662f\u5efa\u7acb\u8fde\u63a5\uff0c\u7136\u540e\u4ece\u5e94\u7528\u5c42\u7a0b\u5e8f\u4e2d\u63a5\u6536\u6570\u636e\u5e76\u8fdb\u884c\u4f20\u8f93\u3002TCP\u91c7\u7528\u865a\u7535\u8def\u8fde\u63a5\u65b9\u5f0f\u8fdb\u884c\u5de5\u4f5c\uff0c\u5728\u53d1\u9001\u6570\u636e\u524d\u5b83\u9700\u8981\u5728\u53d1\u9001\u65b9\u548c\u63a5\u6536\u65b9\u5efa\u7acb\u4e00\u4e2a\u8fde\u63a5\uff0c\u6570\u636e\u5728\u53d1\u9001\u51fa\u53bb\u540e\uff0c\u53d1\u9001\u65b9\u4f1a\u7b49\u5f85\u63a5\u6536\u65b9\u7ed9\u51fa\u4e00\u4e2a\u786e\u8ba4\u6027\u7684\u5e94\u7b54\uff0c\u5426\u5219\u53d1\u9001\u65b9\u5c06\u8ba4\u4e3a\u6b64\u6570\u636e\u4e22\u5931\uff0c\u5e76\u91cd\u65b0\u53d1\u9001\u6b64\u6570\u636e\u3002<\/p>\n\n\n\n

\u5728\u5efa\u7acb\u8fde\u63a5\u7684\u65f6\u5019\uff0c\u6240\u8c13\u7684\u5ba2\u6237\u7aef\u4e0e\u670d\u52a1\u7aef\u662f\u76f8\u5bf9\u5e94\u7684\uff0c\u5373\u8981\u770b\u662f\u8c01\u4e3b\u52a8\u8fde\u63a5\u7684\u8c01\uff0c\u5982\u679cA\u4e3b\u52a8\u8fde\u63a5B\u90a3\u4e48A\u5c31\u662f\u5ba2\u6237\u7aef\u800cB\u662f\u670d\u52a1\u7aef\uff0c\u5982\u679c\u8fd4\u8fc7\u6765B\u4e3b\u52a8\u8fde\u63a5A\uff0c\u90a3\u4e48B\u5c31\u662f\u5ba2\u6237\u7aef\u800cA\u5c31\u6210\u4e86\u670d\u52a1\u7aef\u3002<\/p>\n\n\n\n

\n\n\n\n

TCP\u7aef\u53e3\u7684\u5341\u4e00\u79cd\u8fde\u63a5\u72b6\u6001<\/h2>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n

CLOSED<\/strong>\uff1a\u7aef\u53e3\u9ed8\u8ba4\u662f\u5173\u95ed\u72b6\u6001\u3002<\/p>\n\n\n\n

LISTEN<\/strong>\uff1a \u670d\u52a1\u5668\u7a0b\u5e8f\u5f00\u59cb\u76d1\u542c\u4e00\u4e2a\u7aef\u53e3\uff0c\u5c31\u662fLISTEN\u72b6\u6001\u3002<\/p>\n\n\n\n

SYN_SENT<\/strong>\uff1aSYN_SENT\u72b6\u6001\u8868\u793a\u5ba2\u6237\u7aef\u5df2\u53d1\u9001SYN=1\u7684\u8bf7\u6c42\u8fde\u63a5\u62a5\u6587\uff0c\u53d1\u9001\u4e4b\u540e\u5ba2\u6237\u7aef\u5c31\u4f1a\u5c06\u81ea\u5df1\u7684\u7aef\u53e3\u72b6\u6001\u7f6e\u4e3aSYN_SENT\u3002<\/p>\n\n\n\n

SYN_RCVD<\/strong>\uff1a\u4e09\u6b21\u63e1\u624b\u7684\u7b2c\u4e8c\u6b21\u63e1\u624b\u540e\u7684\u7aef\u53e3\u72b6\u6001\uff0c\u662f\u6536\u5230\u4e86\u5ba2\u6237\u7aef\u53d1\u9001\u7684SYN_SENT\u6570\u636e\u5305\u4e4b\u540e\u7684\u72b6\u6001\uff0c\u8fd9\u4e2a\u72b6\u6001\u5f88\u77ed\u6682\uff0c\u6b63\u5e38\u5728\u670d\u52a1\u5668\u4e0a\u662f\u5f88\u5c11\u770b\u5230\u7684\uff0c\u9664\u975e\u670d\u52a1\u5668\u6545\u610f\u4e0d\u53d1\u9001\u6700\u540e\u4e00\u6b21\u63e1\u624b\u6570\u636e\u5305\uff0c\u670d\u52a1\u5668\u8fd4\u56de\u7ed9\u5ba2\u6237\u7aefSYN\u786e\u8ba4\u4e4b\u540e\u5c31\u4f1a\u5c06\u5728\u81ea\u5df1\u7684\u7aef\u53e3\u7f6e\u4e3aSYN_RCVD\u3002<\/p>\n\n\n\n

ESTABLISHED<\/strong>\uff1a\u8868\u793a\u5df2\u7ecf\u8fde\u63a5\u6210\u529f\uff0c\u5ba2\u6237\u7aef\u6536\u5230\u670d\u52a1\u5668\u7684\u786e\u8ba4\u62a5\u6587\u4f1a\u56de\u590d\u670d\u52a1\u5668\uff0c\u7136\u540e\u5c31\u5c06\u7aef\u53e3\u7f6e\u4e3aESTABLISHED\uff0c\u670d\u52a1\u5668\u7b2c\u4e09\u6b21\u6536\u5230\u5ba2\u6237\u7aef\u7684ACK\u786e\u8ba4\u5c31\u4f1a\u5c06\u7aef\u53e3\u7f6e\u4e3aESTABLISHED\u5e76\u5f00\u59cb\u4f20\u8f93\u6570\u636e\u3002<\/p>\n\n\n\n

FIN_WAIT_1<\/strong>\uff1a\u51fa\u73b0\u5728\u4e3b\u52a8\u5173\u95ed\u65b9\uff0cFIN_WAIT_1\u72b6\u6001\u5b9e\u9645\u4e0a\u662f\u5f53SOCKET\u5728ESTABLISHED\u72b6\u6001\u65f6\uff0c\u5f53\u4efb\u610f\u4e00\u65b9\u60f3\u4e3b\u52a8\u5173\u95ed\u8fde\u63a5\uff0c\u5411\u5bf9\u65b9\u53d1\u9001\u4e86FIN=1\u7684\u65ad\u5f00\u8fde\u63a5\u8bf7\u6c42\u62a5\u6587\uff0c\u6b64\u65f6\u8be5SOCKET\u5373 \u8fdb\u5165\u5230FIN_WAIT_1\u72b6\u6001\u3002\u800c\u5f53\u5bf9\u65b9\u56de\u5e94ACK\u62a5\u6587
\u540e\uff0c\u5219\u8fdb\u5165\u5230FIN_WAIT_2\u72b6\u6001\uff0c\u5f53\u7136\u5728\u5b9e\u9645\u7684\u6b63\u5e38\u60c5\u51b5\u4e0b\uff0c\u65e0\u8bba\u5bf9\u65b9\u4f55\u79cd\u60c5\u51b5\u4e0b\uff0c\u90fd\u5e94\u8be5\u9a6c \u4e0a\u56de\u5e94ACK\u62a5\u6587\uff0c\u6240\u4ee5FIN_WAIT_1\u72b6\u6001\u4e00\u822c\u662f\u6bd4\u8f83\u96be\u89c1\u5230\u7684\uff0c\u800cFIN_WAIT_2\u72b6\u6001\u8fd8\u6709\u65f6\u5e38\u5e38\u53ef\u4ee5\u7528netstat\u770b\u5230\u3002<\/p>\n\n\n\n

FIN_WAIT_2<\/strong>\uff1a\u51fa\u73b0\u5728\u4e3b\u52a8\u5173\u95ed\u65b9\uff0c\u5f53\u88ab\u52a8\u65b9\u56de\u5e94FIN_WAIT_1\u7684ACK\u62a5\u6587\u540e\uff0c\u5219\u8fdb\u5165\u5230FIN_WAIT_2\u72b6\u6001<\/p>\n\n\n\n

TIME_WAIT<\/strong>\uff1a\u51fa\u73b0\u5728\u4e3b\u52a8\u5173\u95ed\u65b9\uff0c\u8868\u793a\u6536\u5230\u4e86\u5bf9\u65b9\u7684FIN\u8bf7\u6c42\u5173\u95ed\u62a5\u6587\uff0c\u5e76\u53d1\u9001\u51fa\u4e86ACK\u62a5\u6587\uff0c\u5c31\u7b492*MSL(Max Segment Lifetime)\u540e\u5373\u53ef\u56de\u5230CLOSED\u53ef\u7528\u72b6\u6001\u4e86\u3002\u5982\u679cFIN_WAIT_1\u72b6\u6001\u4e0b\uff0c\u6536\u5230\u4e86\u5bf9\u65b9\u540c\u65f6\u5e26FIN\u6807\u5fd7\u548cACK\u6807\u5fd7\u7684\u62a5\u6587\u65f6\uff0c\u53ef\u4ee5\u76f4\u63a5\u8fdb\u5165\u5230TIME_WAIT\u72b6\u6001\uff0c\u800c\u65e0\u987b\u7ecf\u8fc7FIN_WAIT_2\u72b6\u6001\u3002<\/p>\n\n\n\n

CLOSING<\/strong>\uff1a \u8fd9\u79cd\u72b6\u6001\u6bd4\u8f83\u7279\u6b8a\uff0c\u5b9e\u9645\u60c5\u51b5\u4e2d\u5e94\u8be5\u662f\u5f88\u5c11\u89c1\uff0c\u5c5e\u4e8e\u4e00\u79cd\u6bd4\u8f83\u7f55\u89c1\u7684\u4f8b\u5916\u72b6\u6001\u3002\u6b63\u5e38\u60c5\u51b5\u4e0b\uff0c\u5f53\u4f60\u53d1\u9001FIN\u62a5\u6587\u540e\uff0c\u6309\u7406\u6765\u8bf4\u662f\u5e94\u8be5\u5148\u6536\u5230\uff08\u6216\u540c\u65f6\u6536\u5230\uff09\u5bf9\u65b9\u7684 ACK\u62a5\u6587\uff0c\u518d\u6536\u5230\u5bf9\u65b9\u7684FIN\u62a5\u6587\u3002\u4f46\u662fCLOSING\u72b6\u6001\u8868\u793a\u4f60\u53d1\u9001
FIN\u62a5\u6587\u540e\uff0c\u5e76\u6ca1\u6709\u6536\u5230\u5bf9\u65b9\u7684ACK\u62a5\u6587\uff0c\u53cd\u800c\u5374\u4e5f\u6536\u5230\u4e86\u5bf9\u65b9\u7684FIN\u62a5\u6587\u3002\u4ec0\u4e48\u60c5\u51b5\u4e0b\u4f1a\u51fa\u73b0\u6b64\u79cd\u60c5\u51b5\u5462\uff1f\u5176\u5b9e\u7ec6\u60f3\u4e00\u4e0b\uff0c\u4e5f\u4e0d\u96be\u5f97\u51fa\u7ed3\u8bba\uff1a\u90a3\u5c31\u662f\u5982\u679c\u53cc\u65b9\u51e0\u4e4e\u5728\u540c\u65f6close\u4e00\u4e2aSOCKET\u7684\u8bdd\uff0c\u90a3\u4e48\u5c31\u51fa\u73b0\u4e86\u53cc\u65b9\u540c\u65f6\u53d1\u9001FIN\u62a5\u6587\u7684\u60c5\u51b5\uff0c\u4e5f\u5373\u4f1a\u51fa\u73b0CLOSING\u72b6\u6001\uff0c\u8868\u793a\u53cc\u65b9\u90fd\u6b63\u5728\u5173\u95edSOCKET\u8fde\u63a5\u3002<\/p>\n\n\n\n

CLOSE_WAIT<\/strong>\uff1a \u8868\u793a\u5728\u7b49\u5f85\u5173\u95ed\u7aef\u53e3\uff0c\u8fd9\u79cd\u72b6\u6001\u5b58\u5728\u4e8e\u88ab\u52a8\u5173\u95ed\u7684\u4e00\u65b9\u3002<\/p>\n\n\n\n

LAST_ACK<\/strong>\uff1a \u662f\u88ab\u52a8\u5173\u95ed\u65b9\u5728\u4e3b\u52a8\u5173\u95ed\u4e00\u65b9\u5728\u53d1\u9001FIN\u62a5\u6587\u540e\uff0c\u6700\u540e\u7b49\u5f85\u5bf9\u65b9\u7684ACK\u62a5\u6587\uff0c\u5f53\u518d\u6b21\u6536\u5230ACK\u62a5\u6587\u540e\uff0c\u4e5f\u5373\u53ef\u4ee5\u8fdb\u5165\u5230CLOSED\u53ef\u7528\u72b6\u6001\u4e86\u3002<\/p>\n\n\n\n

\n\n\n\n

\u76d1\u63a7TCP\u8fde\u63a5\u6570\u811a\u672c<\/h2>\n\n\n\n

\u751f\u4ea7\u4e2d\u5efa\u8bae\u5728\/etc\/zabbix\/zabbix_agentd.conf.d\u76ee\u5f55\u91cc\u653e\u5b50\u914d\u7f6e\u6587\u4ef6 xxx.conf<\/p>\n\n\n\n

\u9488\u5bf9\u4e0d\u540c\u7684\u914d\u7f6e\u53bb\u5199\u5b50\u914d\u7f6e\u6587\u4ef6\uff0c\u53ef\u89c6\u5316\u6548\u679c\u597d<\/p>\n\n\n\n

\u5982\u679c\u662f\u811a\u672c\uff0c\u5efa\u8bae\u5efa\u4e00\u4e2a\u4e13\u95e8\u653e\u7f6e\u811a\u672c\u7684\u6587\u4ef6\u5939\uff0c\u6bd4\u5982 \/etc\/zabbix\/zabbix_agentd.conf.d\/scripts\/<\/p>\n\n\n\n

\u521b\u5efa\u653e\u811a\u672c\u7684\u76ee\u5f55<\/p>\n\n\n\n

mkdir -p \/etc\/zabbix\/zabbix_agentd.conf.d\/scripts\/<\/code><\/pre>\n\n\n\n
\u521b\u5efa\u811a\u672c\/etc\/zabbix\/zabbix_agentd.conf.d\/scripts\/tcp_conn_plugin.sh<\/p>\n\n\n\n
#!\/bin\/bash\n#Author:xiao qin wa \ntcp_conn_status(){\nTCP_STAT=$1\nss -ant | awk 'NR>1 {++s[$1]} END {for(k in s) print k,s[k]}' > \/tmp\/tcp_conn.txt\nTCP_NUM=$(grep \"$TCP_STAT\" \/tmp\/tcp_conn.txt | cut -d ' ' -f2)\nif [ -z $TCP_NUM ];then\nTCP_NUM=0\nfi\necho $TCP_NUM\n}\nmain(){\ncase $1 in\ntcp_status)\ntcp_conn_status $2;\n;;\nesac\n}\nmain $1 $2<\/code><\/pre>\n\n\n\n
\u7ed9\u811a\u672c\u6267\u884c\u6743\u9650\uff0c\u7136\u540e\u5728agent\u4e0a\u6d4b\u8bd5\u8fd0\u884c\u662f\u5426\u80fd\u83b7\u53d6\u5230\u6570\u636e<\/p>\n\n\n\n
cd \/etc\/zabbix\/zabbix_agentd.conf.d\/scripts\/\nchmod +x .\/tcp_conn_plugin.sh\n.\/tcp_conn_plugin.sh tcp_status ESTAB<\/code><\/pre>\n\n\n\n
\u7f16\u8f91\/etc\/zabbix\/zabbix_agentd.conf<\/p>\n\n\n\n
Include=\/etc\/zabbix\/zabbix_agentd.conf.d\/*.conf<\/code><\/pre>\n\n\n\n
\u521b\u5efa\/etc\/zabbix\/zabbix_agentd.conf.d\/all.conf<\/p>\n\n\n\n
\u6dfb\u52a0\u81ea\u5b9a\u4e49\u76d1\u63a7\u9879\uff0c\u8fd9\u91cc\u7684KEY\u5fc5\u987b\u548c\u6a21\u677f\u914d\u7f6e\u7684\u76d1\u63a7\u9879\u7684KEY\u4e00\u81f4<\/p>\n\n\n\n
UserParameter=linux_status[*],\/etc\/zabbix\/zabbix_agentd.d\/scripts\/tcp_conn_plugin.sh  \"$1\" \"$2\"<\/code><\/pre>\n\n\n\n
\u91cd\u542f\u670d\u52a1<\/p>\n\n\n\n
systemctl restart zabbix-agent<\/code><\/pre>\n\n\n\n
\u5728zabbix server\u7528zabbix_get\u547d\u4ee4\u6d4b\u8bd5\u80fd\u5426\u53d6\u5230\u6570\u636e<\/p>\n\n\n\n
zabbix_get -s \"\u8fd9\u91cc\u6362\u6210agent\u7684IP\" -k \"linux_status[tcp_status,ESTAB]\"<\/code><\/pre>\n\n\n\n
\u5982\u679c\u63d0\u793a\u6743\u9650\u4e0d\u8db3\/tmp\/tcp_conn.txt: Permission denied<\/em><\/p>\n\n\n\n
\u9700\u8981\u5728zabbix agent\u4e0a\u6388\u6743<\/em><\/p>\n\n\n\n
chown zabbix.zabbix \/tmp\/tcp_conn.txt<\/code><\/pre>\n\n\n\n
\u6210\u529f\u53d6\u5230\u6570\u636e\u4ee5\u540e\u5c31\u53ef\u4ee5\u53bb\u5236\u4f5c\u6a21\u677f\u4e86<\/p>\n\n\n\n
\n\n\n\n
\u6a21\u677f\u5236\u4f5c<\/h2>\n\n\n\n
\u5728web\u7aef\u5236\u4f5c\u597d\u6a21\u677f\uff0c\u6dfb\u52a0\u76d1\u63a7\u9879\u3001\u89e6\u53d1\u5668\u3001\u56fe\u5f62\uff0c\u6700\u540e\u5173\u8054\u4e3b\u673a\u5c31\u53ef\u4ee5\u5f00\u59cb\u76d1\u63a7\u4e86\u3002<\/p>\n\n\n\n
\u6ce8\u610f\u6a21\u677f\u91cc\u7684key\u5fc5\u987b\u548cagent\u914d\u7f6e\u6587\u4ef6\u91cc\u7684key\u5bf9\u5e94\uff0c\u4e0d\u7136\u4f1a\u62a5\u9519\u3002<\/p>\n\n\n\n
\u65f6\u95f4\u95f4\u9694\u4e00\u822c\u8bbe\u7f6e\u4e94\u5206\u949f\u3002<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u6211\u5236\u4f5c\u7684\u6a21\u677f\u4e0b\u8f7d\u5730\u5740<\/p>\n\n\n\n
https:\/\/drive.google.com\/file\/d\/1_EfImC6qFkfc6WF5kMVMExnOsatKLxLG\/view?usp=sharing<\/a><\/p>\n\n\n\n
\u5173\u8054\u540e\u7b49\u5f85\u4e00\u6bb5\u65f6\u95f4\u5c31\u80fd\u770b\u5230\u6570\u636e\u4e86<\/p>\n\n\n\n
\"\"<\/figure>\n","protected":false},"excerpt":{"rendered":"
TCP\uff0c\u5168\u79f0Transfer Control Protocol\uff0c\u4e2d\u6587\u540d\u4e3a\u4f20\u8f93\u63a7\u5236\u534f\u8bae\uff0c\u5b83\u5de5\u4f5c\u5728OSI\u7684\u4f20\u8f93\u5c42\uff0c\u63d0\u4f9b\u9762\u5411\u8fde\u63a5\u7684\u53ef\u9760\u4f20\u8f93\u670d\u52a1\uff0cTCP\u7684\u5de5\u4f5c\u4e3b\u8981\u662f\u5efa\u7acb\u8fde\u63a5\uff0c\u7136\u540e\u4ece\u5e94\u7528\u5c42\u7a0b\u5e8f\u4e2d\u63a5\u6536\u6570\u636e\u5e76\u8fdb\u884c\u4f20\u8f93\u3002TCP\u91c7\u7528\u865a\u7535\u8def\u8fde\u63a5\u65b9\u5f0f\u8fdb\u884c\u5de5\u4f5c\uff0c\u5728…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[53,47],"tags":[48],"topic":[],"class_list":["post-694","post","type-post","status-publish","format-standard","hentry","category-zabbix","category-47","tag-zabbix"],"_links":{"self":[{"href":"https:\/\/frogvps.com\/index.php?rest_route=\/wp\/v2\/posts\/694","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/frogvps.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/frogvps.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/frogvps.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/frogvps.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=694"}],"version-history":[{"count":3,"href":"https:\/\/frogvps.com\/index.php?rest_route=\/wp\/v2\/posts\/694\/revisions"}],"predecessor-version":[{"id":728,"href":"https:\/\/frogvps.com\/index.php?rest_route=\/wp\/v2\/posts\/694\/revisions\/728"}],"wp:attachment":[{"href":"https:\/\/frogvps.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=694"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/frogvps.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=694"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/frogvps.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=694"},{"taxonomy":"topic","embeddable":true,"href":"https:\/\/frogvps.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftopic&post=694"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}