#num1
1. 编写监控脚本 tcp_statistics.sh
echo `date +"%F %H:%M:%S"` "TCP-ALL" `netstat -anotp |awk '/tcp/ {print $6}'|wc -l` >> tcp_count.txt
echo `date +"%F %H:%M:%S"` "TCP-LISTEN" `netstat -anotp|grep "LISTEN" |wc -l` >>tcp_count.txt
echo `date +"%F %H:%M:%S"` "TCP-ESTABLISHED" `netstat -anotp | grep "ESTABLISHED" |wc -l ` >> tcp_count.txt
echo `date +"%F %H:%M:%S"` "TCP_TIME_WAIT" `netstat -anotp |grep "TIME_WAIT" |wc -l  ` >> tcp_count.txt
echo `date +"%F %H:%M:%S"` "TCP_CLOSE_WAIT" `netstat -anotp |grep "CLOSE_WAIT" |wc -l` >> tcp_count.txt

2. 更改文件权限
chmod 777 tcp_statistics.sh

3. 加入定时任务
crontab -e
*/1 * * * * sh /root/tcp_statistics.sh

3. 重启定时服务
service crond restart
------------------------------

#num2
ss监控
/usr/sbin/ss state all | awk '{++S[$1]} END {for (a in S) {printf "%11-s %s\n",a,S[a]}}'
LISTEN      9
ESTAB       1
State       1
TIME-WAIT   110
-----------------------------


#num3
netstat监控
/bin/netstat -an|awk '/^tcp/{++S[$NF]}END{for(a in S) print a,S[a]}'
LISTEN 9
ESTABLISHED 1
SYN_SENT 1
TIME_WAIT 126
----------------------------


#num4
脚本监控