A detailed account of deploying an Elixir Phoenix application for DEF CON CTF finals, focusing on challenges with the Erlang Port Mapper Daemon (EPMD). The author explains Erlang's distributed computing architecture, container deployment issues with krun virtualization, and the specific networking problems that prevented the application from starting. The solution involved disabling distributed Erlang functionality using the --dist_listen false flag to bypass EPMD's port binding requirements.
Table of contents
Erlang DistributionCTF InfrastructureHow Axis StartsHow to Deploy a CTF ChallengeConclusion1.4K Impressions