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Re: [tlug] [CFP] Call for presenters - May 10 Technical Meeting

On 2014年04月24日 16:36, Kalin KOZHUHAROV wrote:
On Thu, Apr 24, 2014 at 3:13 PM, 黒鉄章 wrote:
If only there was some way to make virtual server instances that could be
set with identical filesystem snapshots and spun up in seconds, each with
their own IP addresses so any number of challengers could login and begin
instantaneously ....

There are such solutions, but why bother?

It depends on the exercises; ephemeral containers / virtual machines might be desired if doing privilege escalation, destructive modification of the filesystem, etc. Reading what you wrote below, I realize that you have a different sort of "capture the flag" in mind. :)

A simple linux set up with remote ssh is enough.
Everyone gets a home directory, nobody can sniff what others are doing
(and there is no time). If you want more, namespace separation (to
disallow people spoofing the options used for grep) or LXC is in

Tasks are given by copying a certain directory, submitted by producing
a file in ~/answer.txt ( a loop watches all ~/answer and greps for the
right answer).
Alternatively setup a git repo, clone in a new branch, commit/push
back, add a server hook to look for correct answer and play a
"BANG.wav". (branch is needed to prevent people from having unresolved

This sounds like fun! How about setting the server up to give users access to a sequence of challenges, one at a time? When a user completes a challenge, the server can update a leaderboard webpage, announce it using TTS (example: "Kalin has completed challenge number one!"), and copy the next challenge into the user's directory.



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