[LINUX] Tftp server with Docker


Build a tftp server with Docker. I'm not doing anything special.

Target device and environment

Verification environment

Work content

Allow port with firewall

Allow the service to listen for the tftp service

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

Docker image preparation

Create an image so that it can be reused. Create an appropriate directory to put the Dockerfile and the configuration file.

mkdir -p /opt/docker/tftp
cd /opt/docker/tftp

Create a Dockerfile


FROM centos:centos8
RUN dnf -y update ; dnf -y install tftp-server xinetd
COPY tftp /etc/xinetd.d/tftp
CMD [ "/usr/sbin/init" ]

xinetd settings

Create a configuration file to start tftp via xinetd


service tftp
        socket_type             = dgram
        protocol                = udp
        wait                    = yes
        user                    = root
        server                  = /usr/sbin/in.tftpd
        server_args             = -c -u root -s /var/lib/tftpboot
        disable                 = no
        per_source              = 11
        cps                     = 100 2
        flags                   = IPv4

Build an image from a Dockerfile to create a container

Once you have created the Dockerfile, build it. tftp first connects with 69 / udp, but after that it negotiates the port number and transfers data, so it is difficult to forward port with bridge. So it connects to the host network.

docker build --force-rm -t infraserv:tftp . -f ./tftp.df && \
docker run --cap-add sys_admin --security-opt seccomp:unconfined  -v /sys/fs/cgroup:/sys/fs/cgroup:ro \
  --network host -it -d --name tftp --hostname tftp   infraserv:tftp

Operation check

Check with the Cisco router you had

Rdc01#copy run tftp://
Address or name of remote host []?
Destination filename [rdc01-config]?
11944 bytes copied in 1.112 secs (10741 bytes/sec)

Rdc01#copy tftp:// flash:
Destination filename [rdc01-config]?
Accessing tftp://
Loading rdc01-config from (via Vlan10): !
[OK - 11944 bytes]

11944 bytes copied in 0.652 secs (18319 bytes/sec)


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