centos7下安裝telnet服務

阿新 • • 發佈：2019-01-21

先檢視是否安裝Telnet

[[email protected] ~]# rpm -qa | grep telnet
telnet-server-0.17-64.el7.x86_64
telnet-0.17-64.el7.x86_64

若沒有安裝，則分別安裝telnet 和 telnet-server

[[email protected] ~]# yum install telnet-server
Loaded plugins: fastestmirror
Repository HDP-UTILS-1.1.0.21 is listed more than once in the configuration
Loading mirror speeds from cached hostfile
* base: mirrors.aliyun.com
* extras: mirrors.aliyun.com
* updates: mirrors.aliyun.com
Resolving Dependencies
–> Running transaction check
—> Package telnet-server.x86_64 1:0.17-64.el7 will be installed
–> Finished Dependency Resolution
Dependencies Resolved
Package Arch Version Repository Size
\==================================================================================================================================
Installing:
telnet-server x86_64 1:0.17-64.el7 base 41 k
Transaction Summary
\==================================================================================================================================
Install 1 Package
Total download size: 41 k

注意：telnet-server服務啟動依賴xinetd服務。

檢視是否安裝xinetd

[[email protected] ~]# rpm -qa | grep xinetd
[[email protected] ~]#

安裝xinetd

[[email protected] ~]# yum install -y xinetd
Loaded plugins: fastestmirror
Repository HDP-UTILS-1.1.0.21 is listed more than once in the configuration
Loading mirror speeds from cached hostfile
* base: mirrors.aliyun.com
* extras: mirrors.aliyun.com
* updates: mirrors.aliyun.com
Resolving Dependencies
…
Transaction test succeeded
Running transaction
Installing : 2:xinetd-2.3.15-13.el7.x86_64 1/1
Verifying : 2:xinetd-2.3.15-13.el7.x86_64 1/1
Installed:
xinetd.x86_64 2:2.3.15-13.el7
Complete!

開啟xinetd服務並設定為開機自啟。

[[email protected] ~]# systemctl enable xinetd.service
[[email protected] ~]# systemctl status xinetd.service
● xinetd.service - Xinetd A Powerful Replacement For Inetd
Loaded: loaded (/usr/lib/systemd/system/xinetd.service; enabled; vendor preset: enabled)
Active: inactive (dead)
[

[email protected] ~]# systemctl start xinetd.service
[[email protected] ~]# systemctl status xinetd.service
● xinetd.service - Xinetd A Powerful Replacement For Inetd
Loaded: loaded (/usr/lib/systemd/system/xinetd.service; enabled; vendor preset: enabled)
Active: active (running) since Thu 2018-01-18 09:59:00 CST; 2s ago
Process: 55642 ExecStart=/usr/sbin/xinetd -stayalive -pidfile /var/run/xinetd.pid $EXTRAOPTIONS (code=exited, status=0/SUCCESS)
Main PID: 55643 (xinetd)
CGroup: /system.slice/xinetd.service
└─55643 /usr/sbin/xinetd -stayalive -pidfile /var/run/xinetd.pid
Jan 18 09:59:00 Hortonworks02 xinetd[55643]: removing discard
Jan 18 09:59:00 Hortonworks02 xinetd[55643]: removing discard
Jan 18 09:59:00 Hortonworks02 xinetd[55643]: removing echo
Jan 18 09:59:00 Hortonworks02 xinetd[55643]: removing echo
Jan 18 09:59:00 Hortonworks02 xinetd[55643]: removing tcpmux
Jan 18 09:59:00 Hortonworks02 xinetd[55643]: removing time
Jan 18 09:59:00 Hortonworks02 xinetd[55643]: removing time
Jan 18 09:59:00 Hortonworks02 xinetd[55643]: xinetd Version 2.3.15 started with libwrap loadavg labeled-networking option…ed in.
Jan 18 09:59:00 Hortonworks02 xinetd[55643]: Started working: 0 available services
Jan 18 09:59:00 Hortonworks02 systemd[1]: Started Xinetd A Powerful Replacement For Inetd.
Hint: Some lines were ellipsized, use -l to show in full.

測試telnet

[[email protected] ~]# telnet localhost
Trying ::1…
telnet: connect to address ::1: Connection refused
Trying 127.0.0.1…
telnet: connect to address 127.0.0.1: Connection refused

並沒有連線成功。

檢視23埠是否能用

[[email protected] ~]# netstat -tunlp
(only servers)
Foreign Address State PID/Program name
0.0.0.0:* LISTEN 52726/java
0.0.0.0:* LISTEN 6119/java
0.0.0.0:* LISTEN 1/systemd
0.0.0.0:* LISTEN 56810/java
0.0.0.0:* LISTEN 56810/java
0.0.0.0:* LISTEN 53113/jsvc.exec
0.0.0.0:* LISTEN 52726/java
0.0.0.0:* LISTEN 1175/sshd
0.0.0.0:* LISTEN 1785/master
0.0.0.0:* LISTEN 52726/java
0.0.0.0:* LISTEN 52726/java
0.0.0.0:* LISTEN 2229/python
0.0.0.0:* LISTEN 53113/jsvc.exec
0.0.0.0:* LISTEN 53113/jsvc.exec
0.0.0.0:* LISTEN 56810/java
0.0.0.0:* LISTEN 6119/java
:::* LISTEN 54539/java
:::* LISTEN 4481/java
:::* LISTEN 9540/java
:::* LISTEN 4481/java
:::* LISTEN 54539/java
:::* LISTEN 1/systemd
:::* LISTEN 2778/java
:::* LISTEN 995/httpd
:::* LISTEN 2778/java
:::* LISTEN 9540/java
:::* LISTEN 6072/java
:::* LISTEN 46355/java
:::* LISTEN 6072/java
:::* LISTEN 1175/sshd
:::* LISTEN 54539/java
:::* LISTEN 1785/master
:::* LISTEN 54539/java
:::* LISTEN 40547/java
:::* LISTEN 46639/java
:::* LISTEN 6072/java
:::* LISTEN 46355/java
:::* LISTEN 6072/java
:::* LISTEN 6072/java
:::* LISTEN 9540/java
:::* LISTEN 2778/java
:::* LISTEN 5674/java
:::* LISTEN 54539/java
:::* LISTEN 9540/java
:::* LISTEN 54539/java
0.0.0.0:* 53113/jsvc.exec
0.0.0.0:* 2480/rpcbind
0.0.0.0:* 62181/ntpd
0.0.0.0:* 62181/ntpd
0.0.0.0:* 62181/ntpd
0.0.0.0:* 2480/rpcbind
0.0.0.0:* 53113/jsvc.exec
:::* 2480/rpcbind
:::* 62181/ntpd
:::* 62181/ntpd
:::* 62181/ntpd
:::* 2480/rpcbind

可以看到，tcp並沒有23埠。

開放23埠

[[email protected] xinetd.d]# firewall-cmd –zone=public –add-port=23/tcp –permanent
success
[[email protected] xinetd.d]# firewall-cmd –reload
success

檢視修改是否生效

[[email protected] xinetd.d]# firewall-cmd –zone=public –query-port=23/tcp
yes

再進行telnet測試

[[email protected] xinetd.d]# telnet localhost
Trying ::1…
Connected to localhost.
Escape character is ‘^]’.
Kernel 3.10.0-514.el7.x86_64 on an x86_64
Hortonworks02 login: root
Password:
Login incorrect

一直提示密碼不正確。
註釋/etc/pam.d/remote的第一行

再次測試

[[email protected] xinetd.d]# telnet localhost 23
Trying ::1…
Connected to localhost.
Escape character is ‘^]’.
Kernel 3.10.0-514.el7.x86_64 on an x86_64
Hortonworks02 login: root
Password:
Last login: Thu Jan 18 10:33:29 from localhost

終於成功了。

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