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Failed to access container containers created inside docker

I have a file docker-compose.ymlthat starts a simple HTTP echo service on a port 8800.

version: '2'

services:
    echo-server:
        image: luisbebop/echo-server
        container_name: echo-server
        ports:
        - "8800:8800"

Super simple stuff. If I run docker-compose upand run on my local computer:

echo "Hello World" | nc 127.0.0.1 8800

Then I see an echo. However: If I run the same build script inside the docker container through the GitLab runner, it does not work.

I tried to draw attention to this issue in GitLab, but with limited results: https://gitlab.com/gitlab-org/gitlab-ce/issues/26566

My .gitlab-ci.ymlfile looks like this:

---

stages:
  - docker_test

services:
  - docker:dind

docker_test:
  stage: docker_test
  image: docker:latest
  script:
  - docker version
  - apk update
  - apk add py-pip
  - pip install docker-compose
  - docker-compose up -d
  - sleep 10
  - netstat -tulpn
  - docker-compose port echo-server 8800
  - echo "Hello world" | nc 127.0.0.1 8800

And the conclusion gitlab-ci-multi-runner exec docker --docker-privileged docker_test:

$ netstat -tulpn
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name

$ docker-compose port echo-server 8800
0.0.0.0:8800

$ echo "Hello world" | nc 127.0.0.1 8800
ERROR: Build failed: exit code 1

, , , -. - ?

, , , , , , .

Host (My Mac) -> GitLab CI Container -> Docker Compose Container exposing 8800

  ^ Not here        ^ I want port 8800 accessible here

: , CI, :

/ # docker ps
CONTAINER ID        IMAGE                   COMMAND                  CREATED             STATUS              PORTS                    NAMES
ab192edf5872        luisbebop/echo-server   "/opt/echo-server/..."   2 minutes ago       Up About a minute   0.0.0.0:8800->8800/tcp   echo-server
/ # netstat -nltup
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name

"" , , .

+6
1

" ", , Gitlab:

services:
  - docker:dind

, docker. , :

echo "Hello world" | nc docker 8800

, , :

script:
  - echo $DOCKER_HOST
+6

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