[root@w tmp]# cat /etc/*release
CentOS Linux release 7.8.2003 (Core)
NAME="CentOS Linux"
VERSION="7 (Core)"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="7"
PRETTY_NAME="CentOS Linux 7 (Core)"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:7"
HOME_URL="https://www.centos.org/"
BUG_REPORT_URL="https://bugs.centos.org/"

CENTOS_MANTISBT_PROJECT="CentOS-7"
CENTOS_MANTISBT_PROJECT_VERSION="7"
REDHAT_SUPPORT_PRODUCT="centos"
REDHAT_SUPPORT_PRODUCT_VERSION="7"

CentOS Linux release 7.8.2003 (Core)
CentOS Linux release 7.8.2003 (Core)

yum install tftp-server xinetd

[root@w tmp]# cat /etc/xinetd.d/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
        wait                    = yes
        user                    = root
        server                  = /usr/sbin/in.tftpd
        server_args             = -c -p -u tftpd -U 111 -s /var/lib/tftpboot
        disable                 = no
        per_source              = 11
        cps                     = 100 2
        flags                   = IPv4
}

useradd -d /var/lib/tftpboot -s /sbin/nologin tftpd
chown tftpd:tftpd /var/lib/tftpboot
chmod 0777 /var/lib/tftpboot

firewall-cmd --zone=public --add-service=tftp --permanent
firewall-cmd --zone=public --add-service=tftp

systemctl enable xinetd
systemctl restart xinetd

[user@host ~]$ tftp -4 192.168.7.3 -c get somefile.txt

[user@host ~]$ tftp -4 192.168.7.3 -c put somefile.txt

-rw-rw-rw- 1 tftpd  tftpd       223 Apr  15 09:10 somefile.txt