Specifying hostname to forward request

[bkuhl]

I was experiencing an issue where ngrok could not access localhost:80. It looked like ngrok was trying to take an external request into the docker container and fowarding it to localhost:80 which it couldn't find.

Here's an example of my not functional config:

version: '2'

services:
  web:
    image: nginx:latest
    ports:
      - "80:80"
  ngrok:
    image: wernight/ngrok
    links:
      - web:http
    ports:
      - "4040:4040"
    env_file: .env

The solution was to tell it to forward incoming requests to web:80 and not alias the web container. Port 80 was the internal port that my web container was listening for, not the one that is publicly exposed. I was able to achieve this with the following configuration:

  ngrok:
    image: wernight/ngrok
    links:
      - web
    ports:
      - "4040:4040"
    env_file: .env
    environment:
      NGROK_PORT: web:80

In this case I happened to resolve the issue but wanted to post it here in case it was helpful to someone else.

[wernight]

May be you'd like to start a WiKi page? I've enabled it.

[walidshaari]

I got the same error, i changed the command from the example to the below:

docker run --rm -d -p 4040 --link www:http --name www_ngrok wernight/ngrok ngrok http http:80

[leewynne]

@bkuhl could you explain a little more on the following based on your solution?

env_file: .env
environment:
NGROK_PORT: web:80

[devkinetic]

NGROK_LOOK_DOMAIN should be what is used for this, but it doesn't work. Currently, using the workaround @bkuhl provided is working.

if [ -n "$NGROK_LOOK_DOMAIN" ]; then
  ARGS="$ARGS `echo $NGROK_LOOK_DOMAIN:$NGROK_PORT | sed 's|^tcp://||'`"
else
  ARGS="$ARGS `echo $NGROK_PORT | sed 's|^tcp://||'`"
fi

[bkuhl]

@madebylee Basically that's saying to read environment variables from .env, but override what's in that file with what's specified in environment.

[ezekel]

@bkuhl , should we use .env here ? or is it ok not to have ?, if ever what's inside in the .env ?

Thank you in advance

ngrok:
image: wernight/ngrok
links:
- web:http
ports:
- "4040:4040"
env_file: .env

[bkuhl]

@ezekel You should be able to use the env_file directive there just fine.

[ezekel]

@bkuhl , I rebuild my docker , my question after I rebuild is there a command to run so that it will expose now to internet ?

[ezekel]

@ezekel You should be able to use the env_file directive there just fine.

Ok I will rebuild again. thank you fro the quick reply

[ezekel]

@bkuhl, I'm done rebuilding my docker, what command to run for ngrok ?

Thank you in advance

[ezekel]

@bkuhl by the way is this will work in my local I used host in windows. then I access my app like this myapp.local, is this will work in ngrok too ?

[ezekel]

@wernight , can I ask please what command I will run so that it will generate ngrok url

Thank you in advance