Debugging Elixir phoenix.server

Question

What I am looking for is some ideas on how to debug mix phoenix.server

When I run the command there is no output and it hangs (doesn't finish and show the cmd prompt). I've tried:

IEx -S mix phoenix.server

this opens up the elixir session but at that point I'm unsure what to do next. I was hoping to see something verbose that showed me where specifically the server start was stopping. I tried:

mix phoenix.server --verbose

and that didn't work, of course. At this moment I'm struggling to figure out what the right approach to this is.

Can you give us more details at which moment this happened ? Is it a new app ? If not, can you give us the potential modifications to the code that might have made this happen ? Thanks — BachirC, Jun 14 '17 at 23:11

score 2 · Accepted Answer · edited Feb 19 '21 at 06:18

2

In your code you need to require the IEx module and place an IEx.pry where you want to debug:

defmodule MyModule do
    require IEx

    def my_function do
        IEx.pry
    end
end

then run your phoenix server in an IEx context:

iex -S mix phx.server

edited Feb 19 '21 at 06:18

ijt

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answered Jun 15 '17 at 02:24

Marcos Costa Pinto

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1

You can also do it inline: `require IEX; IEx.pry` – Mike Quinlan Jun 17 '17 at 15:12

score 1 · Answer 2 · answered Jun 14 '17 at 15:44

1

Try modifying your dev.exs file and set your logger level to debug.

answered Jun 14 '17 at 15:44

Jesse Shieh

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Debugging Elixir phoenix.server

2 Answers2