gitlab-org / gitlab

This document provides a comprehensive step-by-step guide on how to set up CI/CD deployment for the GitLab project. The focus is on the existing configurations and build files in the repository. If CI/CD settings are not found, alternative steps are offered.

Overview

Continuous Integration and Continuous Deployment (CI/CD) are essential practices in modern software development that allow teams to deliver updates with speed and efficiency. This documentation will outline the existing setup based on the provided build files.

CI/CD Configuration

Checking Existing CI/CD Setup

  1. Look for .gitlab-ci.yml: This is the primary configuration file for GitLab CI/CD pipelines. Open the root directory of the project to check for the presence of this file.

If CI/CD is Not Set Up

If the .gitlab-ci.yml does not exist:

  • It indicates that CI/CD has not been configured for this project.

Next Steps:

  • Create a .gitlab-ci.yml file in the root of your repository. This file will define your job, stages, and other CI/CD settings.
stages:
  - build
  - test
  - deploy
  
build:
  stage: build
  script:
    - echo "Building the project..."
    
test:
  stage: test
  script:
    - echo "Running tests..."
    
deploy:
  stage: deploy
  script:
    - echo "Deploying the application..."

Analyzing Existing Build Files

Dockerfile Overview

If the project has a Dockerfile, it indicates that containerization is involved. The provided Dockerfile includes the following important features:

  • Base Image Definition:
FROM registry.gitlab.com/gitlab-org/gitlab-build-images/${BUILD_OS}-${OS_VERSION}-ruby-${RUBY_VERSION}:git-${GIT_VERSION}-lfs-${LFS_VERSION}-chrome-${CHROME_VERSION}-docker-${DOCKER_VERSION}-gcloud-${GCLOUD_VERSION}-kubectl-${KUBECTL_VERSION}-helm-${HELM_VERSION} AS foss

This line specifies the base image from which to start, using multiple ARG variables to tailor the build environment.

  • Environment Settings:
ENV DEBIAN_FRONTEND="noninteractive"
ENV BUNDLE_APP_CONFIG=/home/gitlab/.bundle

These variables configure the environment for non-interactive installations and set the bundler configuration path.

  • System Libraries Installation:
RUN apt-get update && \
    apt-get install -y xvfb unzip google-cloud-sdk-gke-gcloud-auth-plugin && \
    apt-get -yq autoremove && \
    apt-get clean -yqq && \
    rm -rf /var/lib/apt/lists/*

Using RUN, this command installs necessary system libraries and cleans up to reduce image size.

Docker Compose File Overview

Additionally, check the docker-compose.yml file:

app:
  image: gitlab/gitlab-ce:latest

This indicates the Docker image used for deploying the GitLab application, suggesting a containerized environment.

Example CI/CD Configuration

Based on existing files, the following CI/CD pipeline can be developed:

image: gitlab/gitlab-ce:latest

stages:
  - build
  - test

build_job:
  stage: build
  script:
    - echo "Building your application"
    - docker build -t my-app .

test_job:
  stage: test
  script:
    - echo "Running tests"
    - docker run my-app test

This CI/CD configuration employs Docker to build and test the application, utilizing images already defined in the Docker files available in the repository.

Conclusion

This documentation outlines the steps to check for, set up, and leverage CI/CD for projects within gitlab-org/gitlab. If a CI/CD configuration does not exist, initiating a .gitlab-ci.yml file serves as a strong starting point for deploying your software effectively.

Reference the contents of your Dockerfile and docker-compose.yml as necessary to tailor your CI/CD pipeline according to your project’s requirements. If further guidance is needed, be sure to consult the official GitLab CI/CD documentation for in-depth examples and best practices.