Can't connect to service from another service by its name

Docker Engine General
1

Docker version 18.03.0-ce, build 0520e24

Hi everyone, I’m having trouble accessing one service from inside another by its name.
Here is the docker-compose.yml:

version: “3.6”

services:
rest:
image: restimage
environment:
- “MONGO_URL=${MONGO_URL}”
deploy:
replicas: 1
ports:
- “8081:8081”

scraper:
image: scrimage
depends_on:
- rest
deploy:
replicas: 1

scraper has the code that is trying to reach rest:8081 and is failing.
Before it was solved using links but they got deprecated.
I tried creating custom network which didn’t help.
Thank you!

Addition: I ran ping rest inside scraper and it returns

ping: unknown host rest

but then it pings some internal IP address.

2

Does the restimage container start as it should?

And, btw, convention recommends to not name your images something with image in it… :wink:

3

It does, and I can access it from host using docker machine ip.
One interesting thing I’ve noticed that when I do
docker network inspect scraper_default
in the attached containers it has names

“Name”: “scraper_rest.1.pmr5h9igwa7mut46wam”
and
“Name”: “scraper_scraper.1.kxgivjn6bq2dt8akdw6”

for containers respectively.
Aren’t they supposed to be “rest” and “scraper”?
Thank you for your response!