Local gitlab pipeline error during connect - docker

Question

I have a local Gitlab setup and trying to build a pipeline that runs a SAST scan using MobSF. Upon trying to pull the image of MobSF in order to run it I get the following error:
error during connect: Post http://docker:2375/v1.39/images/create?fromImage=opensecurity%2Fmobile-security-framework-mobsf&tag=latest: dial tcp: lookup docker on 8.8.8.8:53: no such host
The error comes up on any script line referencing a Docker command.
The whole output of the pipeline is:
Running with gitlab-runner 14.0.0 (3b6f852e)
on pipeline 5qvFbM4s
Preparing the "docker" executor 00:04
Preparing environment 00:01
Running on runner-5qvfbm4s-project-2-concurrent-0 via TheOneWhoKnocks...
Getting source from Git repository 00:01
Fetching changes with git depth set to 50...
Reinitialized existing Git repository in /builds/root/sast-dast-security-testing/.git/
Checking out e71038e1 as master...
Skipping Git submodules setup
Executing "step_script" stage of the job script 00:01
Using docker image sha256:25a1e57c774167d28c44d88fa296f3e1122c6d79e99b98653c899b170393bbd6 for docker:18.09.7-dind with digest docker#sha256:a490c83561c1cef49b6fe12aba2c31f908391ec3efe4eb173225809c981e50c3 ...
$ export DOCKER_HOST=tcp://docker:2375
$ docker pull opensecurity/mobile-security-framework-mobsf
Using default tag: latest
error during connect: Post http://docker:2375/v1.39/images/create?fromImage=opensecurity%2Fmobile-security-framework-mobsf&tag=latest: dial tcp: lookup docker on 8.8.8.8:53: no such host
ERROR: Job failed: exit code 1
This is my .gitlab-ci.yaml:
stages:
- build
- mobsf
build:
image: docker:18.09.7-dind
stage: build
variables:
DOCKER_HOST: tcp://docker:2375/
DOCKER_DRIVER: overlay2
DOCKER_TLS_CERTDIR: ""
script:
- docker pull opensecurity/mobile-security-framework-mobsf
- docker run -i --env-file ./env.list -p 8000:8000 opensecurity/mobile-security-framework-mobsf:latest
mobsf:
image: owasp/glue:raw-latest
stage: mobsf
script:
- ./scan.sh
- docker run -it -v $(pwd):/app owasp/glue:raw-latest ruby bin/glue -t Dynamic -T /app/report.json --mapping-file mobsf --finding-file-path /app/android.json -z 2
And this is my runner's config.toml:
[[runners]]
name = "pipeline"
url = "http://192.168.179.129/"
token = "XXXXX"
executor = "docker"
[runners.custom_build_dir]
[runners.cache]
[runners.cache.s3]
[runners.cache.gcs]
[runners.cache.azure]
[runners.docker]
tls_verify = false
image = "docker:stable"
privileged = true
disable_entrypoint_overwrite = false
oom_kill_disable = false
disable_cache = false
volumes = ["/cache"]
shm_size = 0
Any help would be appreciated!

Answer 1

It's fairly obvious that Google's public DNS servers won't resolve your local DNS requests. "docker"
error during connect: Post http://docker:2375/v1.39/images/create?fromImage=opensecurity%2Fmobile-security-framework-mobsf&tag=latest: dial tcp: lookup docker on 8.8.8.8:53: no such host
Try this answer, i was facing similar one when registering local gitlab-runner to local domain name (gitlab.local).
Docker cannot resolve dns on private network