linux下定時監控tcp連接數的方法和步驟

1. 編寫監控腳本 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. 更改文件權限
chmod 777 tcp_statistics.sh

3. 加入定時任務
crontab -e
*/1 * * * * sh /root/tcp_statistics.sh

3. 重啟定時服務
service crond restart