Rails - ActionCable: "action_cable.url" for Kubernetes/Minikube
I have an answer: in a Minikube cluster, don't put anything and disable forgery protection, Rails will default the correct value. When Nginx is front of a Rails pod and a standalone ActionCable/websocket pod (the Rails image is launched with bundle exec puma -p 28080 cable/config.ru), if I name "cable-svc" the service that exposes the ActionCable container, and "rails-svc" the one for the Rails container, you need to:
- in K8, don't set the config for
CABLE_URI - in the Rails backend, you don't have the URL (unknown
127.0.0.1:some_port), do:
# config.action_cable.url <-- comment thisconfig.action_cable.disable_request_forgery_protection=true- in the Nginx config, add a specific location for the "/cable" path:
upstream rails { server rails-svc:3000;}server { [...root, location @rails {...}] location /cable { proxy_http_version 1.1; proxy_set_header Upgrade $http_upgrade; proxy_set_header Connection "Upgrade"; proxy_pass "http://cable-svc:28080"; }}Check the logs, no more WebSockets in Rails, and Cable responds.