Deploy Rails across multiple servers with Kamal 2: roles, the load balancing gap, boot limit gotchas, the multi-host SSL error, and when one big box wins.
Rails 8.1's ActiveJob::Continuable resumes long jobs from their last completed step. How to wire it in, when not to, why Kamal deploys stop losing work.
Porting a Kamal 1 config to Kamal 2 fails on unknown key: traefik. Here is what each dead key became, and what a working first deploy on one server looks like.
