注意：FTP 使用tcp协议，走的是tcp21端口，20端口或随机端口，共两个，TFTP使用udp协议，TFTP用udp69端口。TFTP是个非独立服务。支持文件下载、共享，TFTP(Trivial File Transfer Protocol,简单文件传输协议)是TCP/IP协议族中的一个用来在客户机与服务器之间进行简单文件传输的协议，提供不复杂、开销不大的文件传输服务，端口号为69。

前期准备：网卡必须在桥接模式下才能连接到外网，下载TFTP服务，所以把网卡修改为172.20网段。

1、[root@centos7 ~]# yum install tftp-server Loaded plugins: fastestmirror, langpacks Loading mirror speeds from cached hostfile development | 3.6 kB 00:00:00
epel | 4.7 kB 00:00:00
(1/2): epel/updateinfo | 956 kB 00:00:00
(2/2): epel/primary_db | 6.6 MB 00:00:00
Resolving Dependencies --> Running transaction check ---> Package tftp-server.x86_64 0:5.2-22.el7 will be installed --> Finished Dependency Resolution

Dependencies Resolved

================================================================================= Package Arch Version Repository Size

Installing: tftp-server x86_64 5.2-22.el7 development 47 k

Transaction Summary

Install 1 Package

Total download size: 47 k Installed size: 64 k Is this ok [y/d/N]: y Downloading packages: tftp-server-5.2-22.el7.x86_64.rpm | 47 kB 00:00:00
Running transaction check Running transaction test Transaction test succeeded Running transaction Installing : tftp-server-5.2-22.el7.x86_64 1/1 Verifying : tftp-server-5.2-22.el7.x86_64 1/1

Installed: tftp-server.x86_64 0:5.2-22.el7

Complete! [root@centos7 ~]# rpm -ql tftp-server /etc/xinetd.d/tftp /usr/lib/systemd/system/tftp.service /usr/lib/systemd/system/tftp.socket /usr/sbin/in.tftpd /usr/share/doc/tftp-server-5.2 /usr/share/doc/tftp-server-5.2/CHANGES /usr/share/doc/tftp-server-5.2/README /usr/share/doc/tftp-server-5.2/README.security /usr/share/man/man8/in.tftpd.8.gz /usr/share/man/man8/tftpd.8.gz /var/lib/tftpboot

2、开启TFTP服务，查看端口： [root@centos7 ~]# systemctl start tftp [root@centos7 ~]# ss -ntul Netid State Recv-Q Send-Q Local Address:Port Peer Address:Port
udp UNCONN 0 0 *:5353 :
udp UNCONN 0 0 *:49063 :
udp UNCONN 0 0 192.168.122.1:53 :
udp UNCONN 0 0 *:67 :
udp UNCONN 0 0 *%virbr0:67 :
udp UNCONN 0 0 :68 :
udp UNCONN 0 0 :111 :
udp UNCONN 0 0 :893 :
udp UNCONN 0 0 :::69 :::
udp UNCONN 0 0 :::111 :::
udp UNCONN 0 0 :::893 :::
tcp LISTEN 0 128 *:111 :
查看是谁在监听： [root@centos7 ~]# ss -ntulp Netid State Recv-Q Send-Q Local Address:Port Peer Address:Port
udp UNCONN 0 0 *:5353 : users:(("avahi-daemon",pid=6238,fd=12)) udp UNCONN 0 0 *:49063 : users:(("avahi-daemon",pid=6238,fd=13)) udp UNCONN 0 0 192.168.122.1:53 : users:(("dnsmasq",pid=7400,fd=5)) udp UNCONN 0 0 *:67 : users:(("dhcpd",pid=22547,fd=7)) udp UNCONN 0 0 *%virbr0:67 : users:(("dnsmasq",pid=7400,fd=3)) udp UNCONN 0 0 *:68 : users:(("dhclient",pid=23857,fd=6)) udp UNCONN 0 0 *:111 : users:(("rpcbind",pid=6234,fd=5),("systemd",pid=1,fd=155)) udp UNCONN 0 0 *:893 : users:(("rpcbind",pid=6234,fd=10))

udp UNCONN 0 0 :::69 :::* users:(("in.tftpd",pid=24131,fd=0),("systemd",pid=1,fd=24))

udp UNCONN 0 0 :::111 :::*
3、实现确保开机就启动TFTP服务： [root@centos7 ~]# systemctl enable tftp Created symlink from /etc/systemd/system/sockets.target.wants/tftp.socket to /usr/lib/systemd/system/tftp.socket.

注：笔记：（centos7 1、yum install tftp-server 2、systemctl start tftp 3、systemctl enable tftp）(centos6 1、yum install tftp-server 2、chkconfig tftp on 3、service xinetd restart )

4、我们在客户端安装TFTP [root@Centos6 ~]# yum install tftp Loaded plugins: fastestmirror, refresh-packagekit, security Setting up Install Process Loading mirror speeds from cached hostfile base | 3.7 kB 00:00
centosplus | 3.4 kB 00:00
contrib | 2.9 kB 00:00
epel | 4.7 kB 00:00
epel/primary_db | 6.0 MB 00:00
extras | 3.4 kB 00:00
updates | 3.4 kB 00:00
updates/primary_db | 3.0 MB 00:00
Resolving Dependencies --> Running transaction check ---> Package tftp.x86_64 0:0.49-8.el6 will be installed --> Finished Dependency Resolution

Dependencies Resolved

================================================================================= Package Arch Version Repository Size

Installing: tftp x86_64 0.49-8.el6 base 32 k

Transaction Summary

Install 1 Package(s)

Total download size: 32 k Installed size: 45 k Is this ok [y/N]: y Downloading Packages: tftp-0.49-8.el6.x86_64.rpm | 32 kB 00:00
Running rpm_check_debug Running Transaction Test Transaction Test Succeeded Running Transaction Installing : tftp-0.49-8.el6.x86_64 1/1 Verifying : tftp-0.49-8.el6.x86_64 1/1

Installed: tftp.x86_64 0:0.49-8.el6

Complete! [root@Centos6 ~]# rpm -ql tftp /usr/bin/tftp /usr/share/doc/tftp-0.49 /usr/share/doc/tftp-0.49/CHANGES /usr/share/doc/tftp-0.49/README /usr/share/doc/tftp-0.49/README.security /usr/share/doc/tftp-0.49/README.security.tftpboot /usr/share/man/man1/tftp.1.gz [root@Centos6 ~]# chkconfig tftp on [root@Centos6 ~]# service xinetd restart Stopping xinetd: [FAILED] Starting xinetd: [ OK ]

5、我们找到他的工作目录，里面无东西，拷贝一份文件过来，命名为f1 [root@centos7 ~]# cd /var/lib/tftpboot/ [root@centos7 tftpboot]# ls [root@centos7 tftpboot]# cp /etc/fstab f1 [root@centos7 tftpboot]# ll total 4 -rw-r--r-- 1 root root 655 Feb 3 11:44 f1

[root@Centos6 ~]# tftp 192.168.141.130 tftp> get f1 tftp> quit 此时centos6上就可以接收到f1 文件。

至此，tftp服务搭建完成！！