Overview

Docker-based tftp server with PXE boot images.

Start a container with hostname tftp.example.com and specify kickstart server ks.example.com in the PXE config:

docker pull jumanjiman/tftp:latest
docker run -d -p 69:69/udp -h tftp.example.com -e FQDN=ks.example.com jumanjiman/tftp

Alternatively, create /etc/systemd/system/tftp.service with:

[Unit]
Description=TFTP Server
After=docker.service
Requires=docker.service

[Service]
ExecStartPre=/usr/sbin/modprobe nf_conntrack_tftp
ExecStartPre=/usr/sbin/modprobe nf_nat_tftp
ExecStartPre=/bin/bash -c '/usr/bin/docker inspect %n &> /dev/null && /usr/bin/docker rm %n || :'
ExecStart=/usr/bin/docker run --rm --name %n -p 69:69/udp -h tftp.example.com -e FQDN=ks.example.com jumanjiman/tftp
ExecStop=/usr/bin/docker stop %n
RestartSec=5s
Restart=always

[Install]
WantedBy=multi-user.target

Then run:

systemctl start tftp.service
systemctl enable tftp.service

Test harness

contributor friction
  there should not be any

jumanjiman/tftp
  api version
    should be valid
  image
    should be available
  docker
    should expose tftp port and only tftp port

tftpd
  host must support tftp nat
  host must support tftp connection tracking
  container should serve pxelinux.0
  container should serve pxelinux.cfg/default
  container should serve coreos alpha
  container should serve coreos beta
  pxe menu is available
  pxe menu shows coreos version

users with interactive shells
  should only include "root" and "user"