telnet ip port

最新推荐文章于 2024-07-09 16:28:07 发布

lazy_cat_go

最新推荐文章于 2024-07-09 16:28:07 发布

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分类专栏： LINUX

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本文介绍了如何在Linux系统中使用Telnet服务检查远程服务器的特定端口是否开放。首先，通过命令行确认本地系统是否已安装Telnet服务，若未安装，则使用YUM命令进行安装。接着，演示了如何通过Telnet命令连接到目标服务器的指定端口，并根据返回结果判断端口是否可用。

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查看某一个机器上的某一个端口是否可以访问

[root@iZ2ze7osf716ivjylia496Z redis]# telnet 172.17.154.217 6379
-bash: telnet: command not found

上述代码表示没有安装telnet服务

yum list telnet*              列出telnet相关的安装包
yum install telnet-server          安装telnet服务
yum install telnet.*           安装telnet客户端

yum list telnet* 列出telnet相关的安装包

[root@iZ2ze7osf716ivjylia496Z redis]# yum list telnet*
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
Available Packages
telnet.x86_64                                                     1:0.17-65.el7_8                                              updates
telnet-server.x86_64                                              1:0.17-65.el7_8

yum install telnet-server 安装telnet服务

[root@iZ2ze7osf716ivjylia496Z redis]# yum install telnet-server
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
base                                                                                                           | 3.6 kB  00:00:00     
epel                                                                                                           | 4.7 kB  00:00:00     
extras                                                                                                         | 2.9 kB  00:00:00     
updates                                                                                                        | 2.9 kB  00:00:00     
(1/3): updates/7/x86_64/primary_db                                                                             | 176 kB  00:00:00     
(2/3): epel/x86_64/updateinfo                                                                                  | 1.0 MB  00:00:00     
(3/3): epel/x86_64/primary_db                                                                                  | 6.8 MB  00:00:00     
Resolving Dependencies
--> Running transaction check
---> Package telnet-server.x86_64 1:0.17-65.el7_8 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

======================================================================================================================================
 Package                           Arch                       Version                               Repository                   Size
======================================================================================================================================
Installing:
 telnet-server                     x86_64                     1:0.17-65.el7_8                       updates                      41 k

Transaction Summary
======================================================================================================================================
Install  1 Package

Total download size: 41 k
Installed size: 55 k
Is this ok [y/d/N]: y
Downloading packages:
telnet-server-0.17-65.el7_8.x86_64.rpm                                                                         |  41 kB  00:00:00     
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Installing : 1:telnet-server-0.17-65.el7_8.x86_64                                                                               1/1 
  Verifying  : 1:telnet-server-0.17-65.el7_8.x86_64                                                                               1/1 

Installed:
  telnet-server.x86_64 1:0.17-65.el7_8                                                                                                

Complete!

yum install telnet.* 安装telnet客户端

[root@iZ2ze7osf716ivjylia496Z redis]# yum install telnet.*
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
Resolving Dependencies
--> Running transaction check
---> Package telnet.x86_64 1:0.17-65.el7_8 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

======================================================================================================================================
 Package                      Arch                         Version                                Repository                     Size
======================================================================================================================================
Installing:
 telnet                       x86_64                       1:0.17-65.el7_8                        updates                        64 k

Transaction Summary
======================================================================================================================================
Install  1 Package

Total download size: 64 k
Installed size: 113 k
Is this ok [y/d/N]: y
Downloading packages:
telnet-0.17-65.el7_8.x86_64.rpm                                                                                |  64 kB  00:00:00     
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Installing : 1:telnet-0.17-65.el7_8.x86_64                                                                                      1/1 
  Verifying  : 1:telnet-0.17-65.el7_8.x86_64                                                                                      1/1 

Installed:
  telnet.x86_64 1:0.17-65.el7_8                                                                                                       

Complete!

使用telnet功能

[root@iZ2ze7osf716ivjylia496Z redis]# telnet 172.17.154.217 6379
Trying 172.17.154.217...
telnet: connect to address 172.17.154.217: Connection refused

172.17.154.217 服务器的 6379端口没有开放

[root@iZ2ze7osf716ivjylia496Z ~]# telnet 172.17.154.217 6379
Trying 172.17.154.217...
Connected to 172.17.154.217.
Escape character is '^]'.

172.17.154.217 服务器的 6379端口开放了

输入quit退出备注ctrl+c或者ctrl+d不好用


[root@iZ2ze7osf716ivjylia496Z ~]# telnet 172.17.154.217 6379
Trying 172.17.154.217...
Connected to 172.17.154.217.
Escape character is '^]'.
quit
+OK
Connection closed by foreign host.
[root@iZ2ze7osf716ivjylia496Z ~]#