docker - Remote debug Rails app on Kubernetes with RubyMine

Question

I'm trying to debug a rails application running in a k8s cluster.

The stack used is the following: Ruby '2.6.6' - Docker Engine v20.10.2 - Kubernetes v1.19.3 - Skaffold v1.17.2 - MacOS BigSur 11.1

Skaffold is running with skaffold dev --port-forward

In Dockerfile i have CMD ["rdebug-ide", "--debug", "--host", "0.0.0.0", "--port", "1234", "--dispatcher-port", "5884", "--", "bin/bundle", "exec", "rails", "s"]

The service yaml for this app is like:

apiVersion: v1
kind: Service
metadata:
  name: system-management-srv
spec:
  selector:
    app: system-management
  ports:
    - name: system-management
      port: 3000
    - name: debug
      port: 1234

When i start the "RemoteDebug" configuration, it can detect the breakpoints, but the output error is:

[system-management] Connected from local client
[system-management] 1: Starting control thread
[system-management] 1: Processing in control: b /project/app/controllers/api/v1/services_controller.rb:25
[system-management] 1: <breakpointAdded no="1" location="/project/app/controllers/api/v1/services_controller.rb:25"/>
[system-management] 1: Processing in control: b /project/app/controllers/api/v1/services_controller.rb:28
[system-management] 1: <breakpointAdded no="2" location="/project/app/controllers/api/v1/services_controller.rb:28"/>
[system-management] 1: Processing in control: b /project/app/controllers/api/v1/services_controller.rb:29
[system-management] 1: <breakpointAdded no="3" location="/project/app/controllers/api/v1/services_controller.rb:29"/>
[system-management] 1: Processing in control: b /project/app/controllers/api/v1/services_controller.rb:27
[system-management] 1: <breakpointAdded no="4" location="/project/app/controllers/api/v1/services_controller.rb:27"/>
[system-management] 1: Processing in control: b /project/app/controllers/api/v1/services_controller.rb:7
[system-management] 1: <breakpointAdded no="5" location="/project/app/controllers/api/v1/services_controller.rb:7"/>
[system-management] 1: Processing in control: b /project/app/controllers/api/v1/services_controller.rb:24
[system-management] 1: <breakpointAdded no="6" location="/project/app/controllers/api/v1/services_controller.rb:24"/>
[system-management] 1: Processing in control: b /project/app/controllers/api/v1/services_controller.rb:11
[system-management] 1: <breakpointAdded no="7" location="/project/app/controllers/api/v1/services_controller.rb:11"/>
[system-management] 1: Processing in control: start
[system-management] 1: Starting: running program script
[system-management] /usr/local/bundle/gems/ruby-debug-ide-0.7.2/lib/ruby-debug-ide/multiprocess/starter.rb:3:in `<top (required)>': undefined method `split' for nil:NilClass (NoMethodError)
[system-management]     from bin/rails:1:in `require'
[system-management] Fast Debugger (ruby-debug-ide 0.7.2, debase 0.2.4.1, file filtering is supported) listens on 0.0.0.0:1234
WARN[3324] exit status 1                                
[system-management] error: unexpected EOF

How can i make it work?

EDIT:

i tried adding

ENV DEBUGGER_STORED_RUBYLIB ''
ENV RUBYLIB ''

as suggested here, but still facing errors

    [system-management] 1: Processing in control: b /project/app/controllers/api/v1/services_controller.rb:11
    [system-management] 1: <breakpointAdded no="7" location="/project/app/controllers/api/v1/services_controller.rb:11"/>
    [system-management] 1: Processing in control: start
    [system-management] 1: Starting: running program script
    [system-management] 1: connection failed(1)
    [system-management] Exception: Connection refused - connect(2) for "127.0.0.1" port 5884
    [system-management]     /usr/local/bundle/gems/ruby-debug-ide-0.7.2/lib/ruby-debug-ide.rb:201:in `initialize'
    [system-management]     /usr/local/bundle/gems/ruby-debug-ide-0.7.2/lib/ruby-debug-ide.rb:201:in `open'
    [system-management]     /usr/local/bundle/gems/ruby-debug-ide-0.7.2/lib/ruby-debug-ide.rb:201:in `block in notify_dispatcher_if_needed'
    [system-management]     /usr/local/bundle/gems/ruby-debug-ide-0.7.2/lib/ruby-debug-ide.rb:199:in `times'
    [system-management]     /usr/local/bundle/gems/ruby-debug-ide-0.7.2/lib/ruby-debug-ide.rb:199:in `notify_dispatcher_if_needed'
    [system-management]     /usr/local/bundle/gems/ruby-debug-ide-0.7.2/lib/ruby-debug-ide.rb:146:in `block in _start_control_common'
[system-management] Fatal exception in DebugThread loop: undefined method `accept' for 3:Integer
[system-management] Backtrace:
[system-management] /usr/local/bundle/gems/ruby-debug-ide-0.7.2/lib/ruby-debug-ide.rb:160:in `block in _start_control_common'
[system-management] Fast Debugger (ruby-debug-ide 0.7.2, debase 0.2.4.1, file filtering is supported) listens on 0.0.0.0:1234

question from:https://stackoverflow.com/questions/65917191/remote-debug-rails-app-on-kubernetes-with-rubymine

Answer 1

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