关于错误IOError:<urlopen error (-3, 'Temporary failure in name resolution')>的解决

fedora安装Tftp时出错：网上对此问题解决方法很多，但都没有解决此问题，最终还是从鸟哥的书上找到答案。

错误信息如下：

[root@tom ~]# yum install xinetd tftp tftp-server

Loaded plugins: refresh-packagekit
http://ftp-stud.hs-esslingen.de/pub/Mirrors/archive.fedoraproject.org/fedora/linux/releases/9/Everything/i386/os/repodata/repomd.xml: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>

Trying other mirror.
http://fedora-mirror01.rbc.ru/pub/fedora-archive/fedora/linux/releases/9/Everything/i386/os/repodata/repomd.xml: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>

Trying other mirror.
http://dl.fedoraproject.org/pub/archive/fedora/linux/releases/9/Everything/i386/os/repodata/repomd.xml: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>

Trying other mirror.

Error: Cannot retrieve repository metadata (repomd.xml) for repository: fedora. Please verify its path and try again

解决方法：

[root@tom /]# yum search tftp

Loaded plugins: refresh-packagekit

================================ Matched: tftp =================================

bootparamd.i386 : A server process which provides boot information to diskless

: clients

curl.i386 : A utility for getting files from remote servers (FTP, HTTP, and

: others)

jakarta-commons-net.noarch : Internet protocol suite Java library

tcp_wrappers.i386 : A security tool which acts as a wrapper for TCP daemons

tftp.i386 : The client for the Trivial File Transfer Protocol (TFTP)

tftp-server.i386 : The server for the Trivial File Transfer Protocol (TFTP)

[root@tom /]# yum install tftp.i386

Loaded plugins: refresh-packagekit

Setting up Install Process

Parsing package install arguments

Resolving Dependencies

--> Running transaction check

---> Package tftp.i386 0:0.48-3.fc9 set to be updated

--> Finished Dependency Resolution

Dependencies Resolved

=============================================================================

Package Arch Version Repository Size

=============================================================================

Installing:

tftp i386 0.48-3.fc9 fedora 28 k

Transaction Summary

=============================================================================

Install 1 Package(s)

Update 0 Package(s)

Remove 0 Package(s)

Total download size: 28 k

Is this ok [y/N]: y

Downloading Packages:

(1/1): tftp-0.48-3.fc9.i386.rpm | 28 kB 00:00

Running rpm_check_debug

Running Transaction Test

Finished Transaction Test

Transaction Test Succeeded

Running Transaction

Installing: tftp ######################### [1/1]

Installed: tftp.i386 0:0.48-3.fc9

Complete!

[root@tom /]# yum install tftp-server.i386

Loaded plugins: refresh-packagekit

Setting up Install Process

Parsing package install arguments

Resolving Dependencies

--> Running transaction check

---> Package tftp-server.i386 0:0.48-3.fc9 set to be updated

--> Processing Dependency: xinetd for package: tftp-server

--> Running transaction check

---> Package xinetd.i386 2:2.3.14-18.fc9 set to be updated

--> Finished Dependency Resolution

Dependencies Resolved

=============================================================================

Package Arch Version Repository Size

=============================================================================

Installing:

tftp-server i386 0.48-3.fc9 fedora 35 k

Installing for dependencies:

xinetd i386 2:2.3.14-18.fc9 fedora 124 k

Transaction Summary

=============================================================================

Install 2 Package(s)

Update 0 Package(s)

Remove 0 Package(s)

Total download size: 160 k

Is this ok [y/N]: y

Downloading Packages:

(1/2): xinetd-2.3.14-18.fc9.i386.rpm | 124 kB 00:01

(2/2): tftp-server-0.48-3.fc9.i386.rpm | 35 kB 00:00

Running rpm_check_debug

Running Transaction Test

Finished Transaction Test

Transaction Test Succeeded

Running Transaction

Installing: xinetd ######################### [1/2]

Installing: tftp-server ######################### [2/2]

Installed: tftp-server.i386 0:0.48-3.fc9

Dependency Installed: xinetd.i386 2:2.3.14-18.fc9

Complete!

[root@tom /]# yum install tcp_wrappers.i386

Loaded plugins: refresh-packagekit

Setting up Install Process

Parsing package install arguments

Package tcp_wrappers-7.6-52.fc9.i386 already installed and latest version

Nothing to do

[root@tom /]# yum install curl.i386

Loaded plugins: refresh-packagekit

Setting up Install Process

Parsing package install arguments

Resolving Dependencies

--> Running transaction check

---> Package curl.i386 0:7.18.1-1.fc9 set to be updated

--> Finished Dependency Resolution

Dependencies Resolved

=============================================================================

Package Arch Version Repository Size

=============================================================================

Installing:

curl i386 7.18.1-1.fc9 fedora 149 k

Transaction Summary

=============================================================================

Install 1 Package(s)

Update 0 Package(s)

Remove 0 Package(s)

Total download size: 149 k

Is this ok [y/N]: y

Downloading Packages:

(1/1): curl-7.18.1-1.fc9.i386.rpm | 149 kB 00:01

Running rpm_check_debug

Running Transaction Test

Finished Transaction Test

Transaction Test Succeeded

Running Transaction

Installing: curl ######################### [1/1]

Installed: curl.i386 0:7.18.1-1.fc9

Complete!

[root@tom /]# yum install bootparamd.i386

Loaded plugins: refresh-packagekit

Setting up Install Process

Parsing package install arguments

Resolving Dependencies

--> Running transaction check

---> Package bootparamd.i386 0:0.17-27.fc9 set to be updated

--> Finished Dependency Resolution

Dependencies Resolved

=============================================================================

Package Arch Version Repository Size

=============================================================================

Installing:

bootparamd i386 0.17-27.fc9 fedora 21 k

Transaction Summary

=============================================================================

Install 1 Package(s)

Update 0 Package(s)

Remove 0 Package(s)

Total download size: 21 k

Is this ok [y/N]: y

Downloading Packages:

(1/1): bootparamd-0.17-27.fc9.i386.rpm | 21 kB 00:00

Running rpm_check_debug

Running Transaction Test

Finished Transaction Test

Transaction Test Succeeded

Running Transaction

Installing: bootparamd ######################### [1/1]

Installed: bootparamd.i386 0:0.17-27.fc9

Complete!

[root@tom /]#

测试：

[root@tom /]# cd tftpboot/

[root@tom tftpboot]# ls

[root@tom tftpboot]# vi /etc/xinetd.

xinetd.conf xinetd.d/

[root@tom tftpboot]# vi /etc/xinetd.d/t

tcpmux-server tftp time-dgram time-stream

[root@tom tftpboot]# vi /etc/xinetd.d/tftp

[root@tom tftpboot]# /etc/init.d/xinetd start

Starting xinetd: [ OK ]

[root@tom tftpboot]# /etc/init.d/xinetd restart

Stopping xinetd: [ OK ]

Starting xinetd: [ OK ]

[root@tom tftpboot]# netstat -a | grep tftp

udp 0 0 *:tftp *:*

到此tftp启动成功

[root@tom /]# cd home/

[root@tom home]# ls

apache apache_1.3.36.tar.gz apache-arm fzf smb

[root@tom home]# tftp 127.0.0.1

tftp> help

tftp-hpa 0.48

Commands may be abbreviated. Commands are:

connect connect to remote tftp

mode set file transfer mode

put send file

get receive file

quit exit tftp

verbose toggle verbose mode

trace toggle packet tracing

literal toggle literal mode, ignore ':' in file name

status show current status

binary set mode to octet

ascii set mode to netascii

rexmt set per-packet transmission timeout

timeout set total retransmission timeout

? print help information

help print help information

tftp> get test

tftp> q

[root@tom home]# ls

apache apache_1.3.36.tar.gz apache-arm fzf smb test

//本机测试Tftp服务器成功