I have a Phoenix application running in a Docker container, based on the bitwalker/alpine-elixir-phoenix image.
I would like to be able to inspect it with :observer.start
as described in chapter 12 of Programming Phoenix.
I assume several steps are needed :
- inspecting the remote host from my local machine, simply via ssh (there is a related discussion here)
- run
iex> :observer.start()
inside the container (I have addedRUN apk add --update postgresql-client erlang-observer && rm -rf /var/cache/apk/*
in my Dockerfile
When doing this, I get the following error :
** (UndefinedFunctionError) function :wx_object.start/3 is undefined (module :wx_object is not available)
:wx_object.start(:observer_wx, [], [])
observer_wx.erl:72: :observer_wx.start/0
My understanding is that wx_object
is part of the UI of :observer.
Assuming this would be fixed by installing another package, is it really the way to go? Is there a resource I could open to outside (a port ?) that would let me grab the output of :observer and render it on my local machine?
Or maybe another idea to explore would be to use ttb
and funnel the raw data (how ?) to :observer
on my local machine?