总结几种Linux环境下端口状态判断的方法

Linux环境下能否知道端口的状态对于我们服务器的运维工作来讲是很重要的，接下来小编就给大家分享几种Linux环境下端口状态的判断方法。

1. nc命令
语法：nc -z -v -n IPADDRESS port
-z 仅用于端口扫描，0输入输出
-v 显示指令执行过程
-n 直接使用IP地址，而不是通过域名服务器

[root@shansibleqa ~]# nc -z -v -n IP 22
Ncat: Version 7.50 ( https://nmap.org/ncat )
Ncat: Connected to IP:22.
Ncat: 0 bytes sent, 0 bytes received in 0.01 seconds.
[root@shansibleqa ~]# nc -z -v -n IP 587
Ncat: Version 7.50 ( https://nmap.org/ncat )
Ncat: Connected to IP:587.
Ncat: 0 bytes sent, 0 bytes received in 0.01 seconds.
2. wget命令
语法：wget ip:port
如果通

[root@shansibleqa ~]# wget IP:22
--2019-12-24 17:43:50-- http://IP:22/
Connecting to IP:22... connected.
HTTP request sent, awaiting response... 200 No headers, assuming HTTP/0.9
Length: unspecified
如果不通

[root@shansibleqa ~]# wget IP:80
--2019-12-24 17:43:56-- http://IP/
Connecting to IP:80... failed: No route to host.
3. shell命令
语法：ssh -v -p port IP
能够连上

[root@shansibleqa ~]# ssh -v -p 80 XX.XX.XX.XX
OpenSSH_7.4p1, OpenSSL 1.0.2k-fips 26 Jan 2017
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 58: Applying options for *
debug1: Connecting to XX.XX.XX.XX [XX.XX.XX.XX] port 80.
debug1: Connection established.
debug1: permanently_set_uid: 0/0
连不上

[root@shansibleqa ~]# ssh -v -p 23 XX.XX.XX.XX
OpenSSH_7.4p1, OpenSSL 1.0.2k-fips 26 Jan 2017
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 58: Applying options for *
debug1: Connecting to XX.XX.XX.XX [XX.XX.XX.XX] port 23.
debug1: connect to address XX.XX.XX.XX port 23: Connection timed out
ssh: connect to host XX.XX.XX.XXport 23: Connection timed out
4. curl命令
语法：curl ip:port
端口通

[root@shansibleqa ~]# curl ip:22
SSH-2.0-OpenSSH_7.4
curl: (56) Recv failure: Connection reset by peer
端口不通

[root@shansibleqa ~]# curl ip:443
curl: (52) Empty reply from server

希望南方联合小编的分享对大家有帮助，南方联合专注IDC14年，为大家提供专业化服务器托管，服务器租用，主机托管，云服务器租用，香港主机托管，云服务器租用，香港主机租用等服务器资源，详情欢迎咨询客服了解。