查看当前是否安装telnet
[knight@knight ~]$ yrpm -qa | grep telnet
[knight@knight ~]$
查看当前可获得安装包
[knight@knight ~]$ yum list | grep telnet
telnet.x86_64 1:0.17-47.el6 RHEL
telnet-server.x86_64 1:0.17-47.el6 RHEL
安装所有与telnet相关的包
[knight@knight ~]# yum -y install telnet*
Loaded plugins: product-id, refresh-packagekit, security, subscription-manager
Updating certificate-based repositories.
Unable to read consumer identity
Setting up Install Process
Package 1:telnet-0.17-47.el6.x86_64 already installed and latest version
Resolving Dependencies
--> Running transaction check
---> Package telnet-server.x86_64 1:0.17-47.el6 will be installed
--> Processing Dependency: xinetd for package: 1:telnet-server-0.17-47.el6.x86_64
--> Running transaction check
---> Package xinetd.x86_64 2:2.3.14-39.el6_4 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
======================================================================================================================================================
Package Arch Version Repository Size
======================================================================================================================================================
Installing:
telnet-server x86_64 1:0.17-47.el6 RHEL 37 k
Installing for dependencies:
xinetd x86_64 2:2.3.14-39.el6_4 bs 122 k
Transaction Summary
======================================================================================================================================================
Install 2 Package(s)
Total download size: 158 k
Installed size: 312 k
Downloading Packages:
(1/2): telnet-server-0.17-47.el6.x86_64.rpm | 37 kB 00:00
(2/2): xinetd-2.3.14-39.el6_4.x86_64.rpm | 122 kB 00:00
------------------------------------------------------------------------------------------------------------------------------------------------------
Total 1.6 MB/s | 158 kB 00:00
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
Warning: RPMDB altered outside of yum.
Installing : 2:xinetd-2.3.14-39.el6_4.x86_64 1/2
Installing : 1:telnet-server-0.17-47.el6.x86_64 2/2
Installed products updated.
Verifying : 1:telnet-server-0.17-47.el6.x86_64 1/2
Verifying : 2:xinetd-2.3.14-39.el6_4.x86_64 2/2
Installed:
telnet-server.x86_64 1:0.17-47.el6
Dependency Installed:
xinetd.x86_64 2:2.3.14-39.el6_4
Complete!
修改配置文件并启动服务
[knight@knight~]# vim /etc/xinetd.d/telnet
# default: on
# description: The telnet server serves telnet sessions; it uses \
# unencrypted username/password pairs for authentication.
service telnet
{
flags = REUSE
socket_type = stream
wait = no
user = root
server = /usr/sbin/in.telnetd
log_on_failure += USERID
disable = no #默认是yes 改为no
}
[knight@knight~]# service xinetd start
Starting xinetd: [ OK ]
测试和退出
[knight@knight~]# telnet 47.88.xx.xx 22
Trying 47.88.xx.xx...
Connected to 47.88.xx.xx.
Escape character is '^]'.
^] # ctrl + ]
telnet> quit #quit+回车
Connection closed.
[knight@knight~]#
关闭服务
[knight@knight~]# service xinetd stop
Stopping xinetd: [ OK ]
