Gitlab Runner auto CI stuck at downloading - kubernetes

Question

Until now I worked a lot with github/bitbucket and jenkins/bamboo. Right now I'm trying to setup a Gitlab CE server with a private kubernetes cluster.
I want to run a hello world project in java with gitlabs AutoDevOps in kubernetes, this is the repo I'm using:
https://github.com/dstar55/docker-hello-world-spring-boot
Everything works fine until runner gets created in kubernetes, downloads the image but gets stuck on downloading maven resources.
Running on runner-h6cwaztm-project-8-concurrent-0jvd9f via runner-gitlab-runner-6dcf7dd458-jl69h...
Fetching changes with git depth set to 50...
00:02
Initialized empty Git repository in /builds/.../hello-world-spring/.git/
Created fresh repository.
From https://.../hello-world-spring
* [new ref] refs/pipelines/14 -> refs/pipelines/14
* [new branch] master -> origin/master
Checking out ad24ac6b as master...
Skipping Git submodules setup
$ if [[ -z "$CI_COMMIT_TAG" ]]; then # collapsed multi-line command
$ /build/build.sh
Logging to GitLab Container Registry with CI credentials...
WARNING! Using --password via the CLI is insecure. Use --password-stdin.
WARNING! Your password will be stored unencrypted in /root/.docker/config.json.
Configure a credential helper to remove this warning. See
https://docs.docker.com/engine/reference/commandline/login/#credentials-store
Login Succeeded
Building Dockerfile-based application...
Step 1/10 : FROM maven:3.5.2-jdk-8-alpine AS maven_build
3.5.2-jdk-8-alpine: Pulling from library/maven
22bc7fb81913: Pull complete
Digest: sha256:7cebda60f8a541e1bf2330306d22f9786f989187f4ec96539d398a0d4dbfdadb
Status: Downloaded newer image for maven:3.5.2-jdk-8-alpine
---> 293423a981a7
Step 2/10 : COPY pom.xml /tmp/
---> c0e609a509a8
Step 3/10 : COPY src /tmp/src/
---> e735a08f2b39
Step 4/10 : WORKDIR /tmp/
---> Running in 90620c0ca3ad
Removing intermediate container 90620c0ca3ad
---> a5d9fdc62aa9
Step 5/10 : RUN mvn package
---> Running in dc90f43fc83b
[INFO] Scanning for projects...
Downloading from central: https://repo.maven.apache.org/maven2/org/springframework/boot/spring-boot-starter-parent/2.2.1.RELEASE/spring-boot-starter-parent-2.2.1.RELEASE.pom
It never throws an error (until it timesout) and it never goes past this point.
Kubernetes has 4 nodes 1 master and 3 slaves, using flannel and MetalLB
Edit:
I added a curl command instead of mvn package and it seems the download speed is 0, how is that possible?
Step 5/11 : RUN curl https://repo.maven.apache.org/maven2/org/springframework/boot/spring-boot-starter-parent/2.2.1.RELEASE/spring-boot-starter-parent-2.2.1.RELEASE.pom --output test.pom
---> Running in db2bc24c6a4f
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:--:-- 0:05:00 --:--:-- 0
curl: (28) Operation timed out after 300689 milliseconds with 0 out of 0 bytes received
The command '/bin/sh -c curl https://repo.maven.apache.org/maven2/org/springframework/boot/spring-boot-starter-parent/2.2.1.RELEASE/spring-boot-starter-parent-2.2.1.RELEASE.pom --output test.pom' returned a non-zero code: 28
ERROR: Job failed: command terminated with exit code 1

Answer 1

According to place where CI hangs, your pipeline stuck at mvn package:
Step 5/10 : RUN mvn package
---> Running in dc90f43fc83b
[INFO] Scanning for projects...
Downloading from central: https://repo.maven.apache.org/maven2/org/springframework/boot/spring-boot-starter-parent/2.2.1.RELEASE/spring-boot-starter-parent-2.2.1.RELEASE.pom
So, you can try to restart Artifactory.
Also, you can debug mvn packages with mvn clean package -X -e
See: this answer :
java - Maven hanging indefinitely while checking for updates - Stack Overflow
mvn clean package -X -e