Hit a service running on localhost from inside a docker image - docker

Question

I'm on mac os, I have a service running on my machine on localhost:8000
now I want to launch a docker image and hit this service from here.
I did a docker bridge and I use it from inside, but it is not working.
Here are my steps:
My host ip:
ifconfig
en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
ether 98:01:a7:b0:2b:41
inet 192.168.0.70 netmask 0xffffff00 broadcast 192.168.0.255
media: autoselect
status: active
I hit my service from host:
curl localhost:8000 #this is working!
I create a bridge and I use it:
docker network create -d bridge --subnet 192.168.0.0/24 --gateway 192.168.0.1 dockernet
docker run --rm -it -v "$(pwd):/src" --network=dockernet qatests /bin/bash
from inside docker, I do a curl but it is not working:
curl 192.168.0.1:8000 #it's not working :-(
any ideas?

Answer 1

You dont need to create a new network. You can use the default one (bridge).
Just check which ip is associated to the docker0 interface in your host with ip or ifconfig (in my case is 172.17.42.1), and use that ip from inside the container:
$ curl 172.17.42.1:8000

Answer 2

In the end, I've discovered that if I ping my pc ip, I can see it even from the docker image.
For convenience, I did a lounch script witch get my current IP and launch the docker image making my ip accessible under "mymac" address
So what i did is lunching
MY_IP=$(ifconfig en0 | grep inet | grep -v inet6 | awk '{print $2}')
docker run --rm -it -v "$(pwd):/src" --add-host=mymac:$MY_IP qatests
/bin/bash
inside docker I can now lunch:
curl mymac:8000 #it works! now mymac is my pc outside docker