Install and use tftp server on Centos.

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yum install tftp-server

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rpm -ihv tftp-server-0.49-8.el6.x86_64.rpm

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$ ls /usr/sbin/in.tftpd
/usr/sbin/in.tftpd

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# cat /etc/xinetd.conf
#
# This is the master xinetd configuration file. Settings in the
# default section will be inherited by all service configurations
# unless explicitly overridden in the service configuration. See
# xinetd.conf in the man pages for a more detailed explanation of
# these attributes.

defaults
{
# The next two items are intended to be a quick access place to
# temporarily enable or disable services.
#
#   enabled     =
#   disabled    =

# Define general logging characteristics.
    log_type    = SYSLOG daemon info
    log_on_failure  = HOST
    log_on_success  = PID HOST DURATION EXIT

# Define access restriction defaults
#
#   no_access   =
#   only_from   =
#   max_load    = 0

# Accept up to 50 connections per second, if more than 50, stop for 20 seconds before accepting new connections
    cps     = 50 10
# Maximum number of connections
    instances   = 50
# Maximum number of connections for a single client
    per_source  = 10

# Address and networking defaults
#
#   bind        =
#   mdns        = yes
    v6only      = no

# setup environmental attributes
#
#   passenv     =
    groups      = yes
    umask       = 002

# Generally, banners are not used. This sets up their global defaults
#
#   banner      =
#   banner_fail =
#   banner_success  =
}

includedir /etc/xinetd.d

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# cd /etc/xinetd.d/
# vim tftp 
# default: off
# description: The tftp server serves files using the trivial file transfer \
#       protocol.  The tftp protocol is often used to boot diskless \
#       workstations, download configuration files to network-aware printers, \
#       and to start the installation process for some operating systems.
service tftp
{
        socket_type             = dgram
        protocol                = udp
        # Concurrency
        wait                    = no
        # Start tftpd user
        user                    = root
        # Start command
        server                  = /usr/sbin/in.tftpd
        # Start parameter, -s specifies the file directory of tftpd, -c means allow file upload
        server_args             = -s /var/lib/tftpboot -c
        # Allow start
        disable                 = no
        per_source              = 11
        cps                     = 100 2
        flags                   = IPv4
}

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chmod 777 /var/lib/tftpboot

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chkconfig tftp on
chkconfig xinetd on
service xinetd start

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# service xinetd status
xinetd (pid  28613) is running...

# ps -ef | grep in.tftpd | grep -v 'grep'
root     23264     1  0 May19 ?        00:00:03 in.tftpd -s /tftpboot -c
nobody   23405 28616  0 14:32 ?        00:00:00 in.tftpd -s /tftpboot -c
root     28616 28613  0 May19 ?        00:00:03 in.tftpd -s /tftpboot -c

# tftpd uses port 69 by default
$ netstat -tuplna | grep ':69 '
(No info could be read for "-p": geteuid()=249958 but you should be root.)
udp        0      0 0.0.0.0:69                  0.0.0.0:*                               -
udp        0      0 0.0.0.0:69                  0.0.0.0:*                               -

# Test port connection
$ nc -uvz 127.0.0.1 69
Connection to 127.0.0.1 69 port [udp/tftp] succeeded!

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# Check whether the tftp client is installed, the system is generally installed by default
$ which tftp
/usr/bin/tftp


$ tftp -v 127.0.0.1
Connected to 127.0.0.1 (127.0.0.1), port 69
tftp> ?
tftp-hpa 0.49
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> quit

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$ tftp 127.0.0.1
tftp> put test.txt
tftp> get test.txt
tftp> quit

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# Upload
$ tftp -v 127.0.0.1 -c put test.txt
Connected to 127.0.0.1 (127.0.0.1), port 69
putting test.txt to 127.0.0.1:test.txt [netascii]
Sent 19 bytes in 0.0 seconds [8069 bit/s] 

# tftpd file directory to view the uploaded files
$ ls /var/lib/tftpboot
test.txt
$ rm -f test.txt
$ ls

# downloaded
$ tftp -v 127.0.0.1 -c get test.txt
Connected to 127.0.0.1 (127.0.0.1), port 69
getting from 127.0.0.1:test.txt to test.txt [netascii]
Received 19 bytes in 0.0 seconds [17714 bit/s]

# View downloaded files
$ ls
test.txt