通过PID查看端口号:netstat -anop|grep pid
——其中的status
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ESTABLISHED:已经建立连接,正在进行数据交换,接收对方发来的数据
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LISTEN:侦听来自远方的TCP连接请求,表示端口正在开放,可以提供服务
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SYN_SENT:发送连接请求等待匹配请求
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FIN_WAIT_1:等待远程TCP连接中断的请求,或对先前中断请求的确认
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FIN_WAIT_2:从远程TCP等待连接中断请求
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CLOSE_WAIT:等待从本地用户发来的连接中断请求
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CLOSING:等待远程TCP连接中断的确认,表示端口认为或防火墙关闭或服务被关停
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LAST_ACK:等待原来发向远程TCP连接中断请求的确认
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TIME_WAIT:正在等待连接
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CLOSED:没有任何连接
如:
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[lenovo@supervisor ~]$ netstat -anop|grep 38670
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(Not all processes could be identified, non-owned process info
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will not be shown, you would have to be root to see it all.) status
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tcp 0 0 :::6707 :::* LISTEN 38670/java off (0.00/0/0)
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tcp 0 0 ::ffff:192.168.0.219:53900 ::ffff:192.168.0.65:3306 ESTABLISHED 38670/java keepalive (3281.61/0/0)
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tcp 0 0 ::ffff:192.168.0.219:53901 ::ffff:192.168.0.65:3306 ESTABLISHED 38670/java keepalive (3281.63/0/0)
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tcp 0 0 ::ffff:192.168.0.219:43923 ::ffff:192.168.0.216:2181 ESTABLISHED 38670/java off (0.00/0/0)
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unix 2 [ ] STREAM CONNECTED 9828854 38670/java
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unix 2 [ ] STREAM CONNECTED 9828818 38670/java
lsof -p PID //查看进程pid打开的文件描述符,(一般情况下,一个进程可以打开的文件描述符的个数不超过1024)