Transcript Summer 05.2
Tinkernet The Presentation Dan Turner, Mark Kegel, Erik Shimshock and Ryan Ausanka-Crues With Support and Encouragement by Titus Winters and Mike Erlinger (also Jason Arold) Project Overview • What is Tinkernet? • System to allow students to write the networking code of an OS • Why would you want it? • Provides a convenient and controlled environment to write and test networking code Students How it works... Nodes Tinkerbell SSH TFTP Hardware • Rack of nodes • Basic (old) computer • minimal components (RAM, CPU, etc.) • Two network cards • Couple of hubs, many ethernet cables • Server • Standard computer (lots of RAM) • Linux Student Assignments • Writing modules to handle the protocol stack • ethernet, IP, UDP, ARP • TCP - could do but is a lot of work • Scaled down version of TCP Student Perspective • SSH in to a server (Tinkerbell) • Write the network module for a kernel • Filling in a code template • Compile code on the server; run on node • Debugging code • Tinkerboot • netprintf The Real Perspective • (1) Student writes code • (2) Student compiles code into kernel • (3) Student uses tinkerboot to load kernel • (4) Student tests kernel • (5) Kernel dies, and student repeats the first four steps Behind the Scenes: Compiling the Kernel • OSKit • provides a fully operable kernel • we strip out the networking module • student code gets compiled in as the new networking module • then you have your kernel... Behind the Scenes: Booting the Kernel • tinkercontroller • is a daemon that manages the nodes • a free node is chosen, and the kernel is sent to it • if all has gone well, you have a running kernel The Running Kernel • Kernels are expected to respond to: • ARP requests • IP broadcast • Handle IP packets • Also UDP • Also need to be able to generate their own packets Controlling the Kernel • Each node has two network cards • Is hooked in to two separate networks: warzone and admin • Student packets are sent over warzone • Admin network handles management of each node - booting, restarting, debug Individual Projects • Dan • Grub • OSKit • Packet dropping Individual Projects • Erik • Built a new rack • Solved missing nodes • Documentation • Comments Individual Projects • Mark • Set up team computers • Tinkerboot GUI • Tinkeradmin GUI Individual Projects • Ryan • Built rack • Missing nodes problem • Website and wiki • Commenting and re-factoring code Things left to do... • Documentation... • Portability... • Packaging for distribution...