Deploying a spring boot application with a postgresql database to kubernetes using Gitlab CI / CD

General
1

Hi everyone, I am currently interested in deploying our applications to kubernetes. Now I have in gitlb deployment solved via docker compose, which is not a very happy solution. I would therefore wish to deploy to the kubernetes cluster. I currently have two kubernetes clusters for testing and I’m trying to deploy them from gitlab CI. The whole pipeline runs fine, but as soon as it is deployed in kubernetes it crashes. I followed the instructions Automated Kubernetes deployments with GitLab, Helm and Traefik | by Yanick Witschi | Medium where I used the deployment method through the helmet chart because it looked best. My goal was to deploy both DB and tomcat, but unfortunately I got stuck with tomcat. When running the build from the manual via gitla-ci.yml it crashes, see below. I’m new to this. Has anyone solved such a problem yet? or do you not have an example of gitlab-ci.yml for tomcat with psql? Below I enclose the current gitlab-ci.yml

    stages:
    - compile
    - build
    - deploy

variables:
    IMAGE: ${CI_REGISTRY_IMAGE}/argos-control-test:${CI_COMMIT_REF_SLUG}
    URL_REVIEW: ${CI_COMMIT_REF_SLUG}.my-app.cloud
    URL_PRODUCTION: live.my-app.cloud

.maven:
  image: maven:3.6.3-openjdk-8
  variables:
  cache:
    key: maven-repository
    paths:
      - .m2/repository

compile:
    extends: .maven
    stage: compile
    script:
        - mvn clean install
        - mv -v target/my-app.war my-app.war
    artifacts:
        paths:
        - my-app.war
        expire_in: 10 min

        

build:
    extends: .maven
    stage: build
    image: docker:18.09.7-dind
    services:
    - docker:18.09.7-dind
    variables:
        DOCKER_DRIVER: overlay
        DOCKER_HOST: tcp://localhost:2375
    artifacts:
        paths:
        - my-app.war

    script:
        - echo "$CI_REGISTRY_PASSWORD" | docker login --username "$CI_REGISTRY_USER" --password-stdin "$CI_REGISTRY"
        - docker build -t "$CI_REGISTRY_IMAGE:$CI_COMMIT_SHA" .
        - docker push "$CI_REGISTRY_IMAGE:$CI_COMMIT_SHA"


deploy_review:
    stage: deploy
    image: devth/helm
    script:
        - mkdir -p /etc/deploy
        - helm upgrade
          --install
          --set web.name="my-app-${CI_COMMIT_REF_SLUG}"
          --set web.image="${IMAGE}"
          --set web.host="${URL_REVIEW}"
          --wait
          --force
          my-app-${CI_COMMIT_REF_SLUG}
          ./k8s-chart
    except:
        refs:
            - master

deploy_production:
    stage: deploy
    image: devth/helm
    script:
        - mkdir -p /etc/deploy
        - helm upgrade
          --install
          --set web.name="my-app-${CI_COMMIT_REF_SLUG}"
          --set web.image="${IMAGE}"
          --set web.host="${URL_PRODUCTION}"
          --wait
          --force
          my-app-${CI_COMMIT_REF_SLUG}
          ./k8s-chart
    only:
        refs:
            - master

and with deploy_production it crashes

Error: Kubernetes cluster unreachable: Get "http://localhost:8080/version?timeout=32s": dial tcp 127.0.0.1:8080: connect: connection refused

Thank you very much in advance for any advice, ideas or help