##netsat

netstat -ant

得到

root@f6c0aba5201d:/# netstat -antActive Internet connections (servers and established)Proto Recv-Q Send-Q Local Address           Foreign Address         Statetcp6       0      0 :::8080                 :::*                    LISTENtcp6      52      0 172.17.0.2:8080         192.168.99.1:56750      ESTABLISHEDtcp6       0      0 172.17.0.2:8080         192.168.99.1:56503      TIME_WAITtcp6      52      0 172.17.0.2:8080         192.168.99.1:56788      ESTABLISHEDtcp6       0      0 172.17.0.2:8080         192.168.99.1:56686      TIME_WAITtcp6       0      0 172.17.0.2:8080         192.168.99.1:56658      TIME_WAITtcp6       0      0 172.17.0.2:8080         192.168.99.1:56723      TIME_WAITtcp6      52      0 172.17.0.2:8080         192.168.99.1:56695      ESTABLISHEDtcp6       0      0 172.17.0.2:8080         192.168.99.1:56688      TIME_WAITtcp6       0      0 172.17.0.2:8080         192.168.99.1:56701      TIME_WAIT

##整体统计

netstat -an | awk '/^tcp/ {++S[$NF]} END {for (a in S) print a, S[a]}'

得到

root@f6c0aba5201d:/# netstat -an | awk '/^tcp/ {++S[$NF]} END {for (a in S) print a, S[a]}'LISTEN 1TIME_WAIT 22ESTABLISHED 96

##TCP的状态机

##建立连接时对应的状态

##doc