Dockerizing a Node.js and MongoDB app with CI/CD Pipelines on Gitlab for staging and production environments.

.gitlab-ci.yml

image: docker:stable

variables:
  DOCKER_DRIVER: overlay2
  CONTAINER_IMAGE: registry.gitlab.com/$CI_PROJECT_PATH
  STAGE_CONTAINER: dev
  PROD_CONTAINER: prod
  DEV_FOLDER: /path/to/repo/dev
  PROD_FOLDER: /path/to/repo/prod

services:
    - docker:dind

stages:
  - build
  - stage
  - deploy

build_dev:
  only:
    - dev
  before_script:
    - docker login --username gitlab-ci-token --password $CI_BUILD_TOKEN registry.gitlab.com
  after_script:
    - docker logout registry.gitlab.com
  image: docker:stable
  stage: build
  script:
    - docker build --tag $CONTAINER_IMAGE/$STAGE_CONTAINER:$CI_COMMIT_SHA --tag $CONTAINER_IMAGE/$STAGE_CONTAINER:latest .
    - docker push $CONTAINER_IMAGE/$STAGE_CONTAINER:$CI_COMMIT_SHA
    - docker push $CONTAINER_IMAGE/$STAGE_CONTAINER:latest

build_master:
  only:
    - master
  before_script:
    - docker login --username gitlab-ci-token --password $CI_BUILD_TOKEN registry.gitlab.com
  after_script:
    - docker logout registry.gitlab.com
  image: docker:stable
  stage: build
  script:
    - docker build --tag $CONTAINER_IMAGE/$PROD_CONTAINER:$CI_COMMIT_SHA --tag $CONTAINER_IMAGE/$PROD_CONTAINER:latest .
    - docker push $CONTAINER_IMAGE/$PROD_CONTAINER:$CI_COMMIT_SHA
    - docker push $CONTAINER_IMAGE/$PROD_CONTAINER:latest

stage:
  only:
    - dev
  stage: stage
  image: kroniak/ssh-client
  script:
    - mkdir -p ~/.ssh
    - chmod 700 ~/.ssh
    - echo -e "Host *\n\tStrictHostKeyChecking no\n\n" > ~/.ssh/config
    - echo "$SSH_PRIVATE_KEY" > ~/.ssh/id_rsa
    - chmod 600 ~/.ssh/id_rsa
    - ssh -i ~/.ssh/id_rsa $SSH_HOST "docker login --username gitlab-ci-token --password $CI_BUILD_TOKEN registry.gitlab.com && cd $DEV_FOLDER && git fetch --all && git reset --hard origin/dev && docker-compose pull $STAGE_CONTAINER && sudo service $STAGE_CONTAINER restart && docker logout registry.gitlab.com"

deploy:
  only:
    - master
  stage: deploy
  image: kroniak/ssh-client
  script:
    - mkdir -p ~/.ssh
    - chmod 700 ~/.ssh
    - echo -e "Host *\n\tStrictHostKeyChecking no\n\n" > ~/.ssh/config
    - echo "$SSH_PRIVATE_KEY" > ~/.ssh/id_rsa
    - chmod 600 ~/.ssh/id_rsa
    - ssh -i ~/.ssh/id_rsa $SSH_HOST "docker login --username gitlab-ci-token --password $CI_BUILD_TOKEN registry.gitlab.com && cd $PROD_FOLDER && git fetch --all && git reset --hard origin/master && docker-compose pull $PROD_CONTAINER && sudo service $PROD_CONTAINER restart && docker logout registry.gitlab.com"