本文共 1936 字，大约阅读时间需要 6 分钟。

linux获取TCP连接数

方法一：[admin@zabbix ~]$ ss -ant | awk 'NR>1 {a[$1]++} END {for (b in a) print b,a[b]}'ESTAB 535TIME-WAIT 80LISTEN 13方法二：[admin@zabbix ~]$ netstat -an | awk '/^tcp/ {a[$NF]++} END {for (b in a) print b,a[b]}'TIME_WAIT 91SYN_SENT 7ESTABLISHED 535LISTEN 13方法三：[admin@zabbix ~]$ cat /proc/net/snmpIp: Forwarding DefaultTTL InReceives InHdrErrors InAddrErrors ForwDatagrams InUnknownProtos InDiscards InDelivers OutRequests OutDiscards OutNoRoutes ReasmTimeout ReasmReqds ReasmOKs ReasmFails FragOKs FragFails FragCreatesIp: 1 64 12503948767 0 0 0 0 0 12503948767 12822437575 0 0 0 0 0 0 0 0 0Icmp: InMsgs InErrors InDestUnreachs InTimeExcds InParmProbs InSrcQuenchs InRedirects InEchos InEchoReps InTimestamps InTimestampReps InAddrMasks InAddrMaskReps OutMsgs OutErrors OutDestUnreachs OutTimeExcds OutParmProbs OutSrcQuenchs OutRedirects OutEchos OutEchoReps OutTimestamps OutTimestampReps OutAddrMasks OutAddrMaskRepsIcmp: 985733 389 3779 69 0 0 0 490950 490935 0 0 0 0 984433 0 2548 0 0 0 0 490935 490950 0 0 0 0IcmpMsg: InType0 InType3 InType8 InType11 OutType0 OutType3 OutType8IcmpMsg: 490935 3779 490950 69 490950 2548 490935Tcp: RtoAlgorithm RtoMin RtoMax MaxConn ActiveOpens PassiveOpens AttemptFails EstabResets CurrEstab InSegs OutSegs RetransSegs InErrs OutRstsTcp: 1 200 120000 -1 1585243925 55029885 290059 15370 535 12500488405 12818246605 731883 25103 3821760Udp: InDatagrams NoPorts InErrors OutDatagrams RcvbufErrors SndbufErrorsUdp: 2546210 3436 0 2657997 0 0UdpLite: InDatagrams NoPorts InErrors OutDatagrams RcvbufErrors SndbufErrorsUdpLite: 0 0 0 0 0 0注：通过CurrEstab获取tcp连接数[admin@zabbix ~]$ cat /proc/net/snmp | grep Tcp | tail -1 | awk '{print $10}'535扩展：如何获取每秒新增的TCP连接呢？通过cat /proc/net/snmp得到最近240秒内PassiveOpens的增量，除以240可以得到每秒的tcp连接增量。详情参考我的另一篇文章：https://blog.csdn.net/m0_37814112/article/details/80774935如果想知道cat /proc/net/snmp输出选项各个参数的意义，可以参考http://perthcharles.github.io/2015/11/10/wiki-netstat-proc/