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Running a TFTP server in Docker

The easiest way to run a TFTP server is to do that inside a containerized environment. It does not matter if you run Linux, Windows, or Mac, just perform these steps:

Install Docker Composer

Follow the Docker installation instructions.

Create Docker image files

Create a file named Dockerfile with the following content:

FROM debian:latest

ARG DEBIAN_FRONTEND=noninteractive

RUN apt-get update && apt-get install tftpd-hpa -y -qq && \
apt-get clean && rm -rf /var/lib/apt/lists/*

CMD echo -n "Starting $(in.tftpd --version)" && \
in.tftpd --foreground --create --secure --ipv4 --verbose --user tftp \
--address 0.0.0.0:69 --blocksize 1468 /srv/tftp

In the same directory, create a file named docker-compose.yml with the following content:

version: '3.9'
services:
  tftpd-hpa:
    build: .
    container_name: tftp
    network_mode: 'host'
    restart: unless-stopped
    volumes:
      - ./tftp:/srv/tftp

Start the container

docker-compose up -d

Docker will build an image if necessary and launch it in the background. During building the container, Docker will also create tftp/ subdirectory from which your files will be served. Docker acts as user systemd-network from group input to access that directory. If you want to allow saving files sent via TFTP to your machine you'll need to change ownership on that directory:

sudo chown systemd-network:input ./tftp

Alternatively, you may loosen permissions on that directory:

sudo chmod 777 ./tftp

Use your computer's IP address to access the TFTP server from other machines on your local network.

Stop the container

To stop the container and free up memory just run

docker-compose stop

The container will be saved on your computer until the next time you need to start it.