GitLab

wikipedia:GitLab (2011) is a web-based DevOps lifecycle software service or locally installed, available since 2011, that provides a Git-repository manager providing wiki, issue-tracking and CI/CD pipeline features, using an open-source license.

Since April 2018, GitLab support integration with Google Kubernetes Engine (GKE) to simplify the process of spinning up a new Kubernetes cluster and deploy applications.

GitLab is integrated of different modules including GitLab Runner (.gitlab-ci.yml) responsible for the continuous integration with an embedded HTTP Statistics Server with Prometheus metrics available on /metrics since GitLab Runner 1.8.0.

GitLab offers many features such as:

• Audit events
• GitLab container registry
• ElasticSearch and Sentry integration (not installed with GitLab)
• read-only mirrors called GitLab Geo (Premium)
• SAML 2.0 Service Provider (SP) capabilities used for Web Browser Single Sign-On (SSO)
• Project members permissions: Guest, Reporter, Developer, Maintainer, Owner

An integrates with many platforms such as Salesforce DX and Snowplow.

GitLab Software

Binaries

• gitlab-ctl
  • gitlab-ctl status
  • gitlab-ctl tail
  • gitlab-ctl pg-password-md5 gitlab
  • gitlab-ctl reconfigure

Configuration files

• Default configuration file: /etc/gitlab/gitlab.rb
• Secrets: /etc/gitlab/gitlab-secrets.json
• Default data directory: /var/opt/gitlab/git-data
• Default backup directory: /var/opt/gitlab/backup
• GitLab CI/CD pipelines: .gitlab-ci.yml https://docs.gitlab.com/ee/ci/yaml/

GitLab logs

• /var/log/gitlab/gitlab-rails/production.log
• application.log and application_json.log (Since GitLab 12.7)

Health checks and monitoring

Health checks https://docs.gitlab.com/ee/user/admin_area/monitoring/health_check.html

• GET http://localhost/-/health
• GET http://localhost/-/readiness
• GET http://localhost/-/liveness

GitLab provides a Prometheus and Grafana integration, GitLab export GitLab metrics to Prometheus monitoring system and it is activated by default since version 9.0 in 2017.

Components

• Sidekiq job scheduler

Activities

Basic

1. Read GitLab CI/CD Pipeline Configuration Reference:.gitlab-ci.yml https://docs.gitlab.com/ee/ci/yaml/
2. Create a backup from GitLab

Medium

1. Read GitLab release notes/Changelog/versions
2. Install GitLab using docker containers. Note: Gitlab uses PostgreSQL as database backend.
3. Review GitLab Automatic Let’s Encrypt Renewal
4. Review GitLab project members permissions/privileges: Guest, Reporter, Developer, Maintainer, Owner, and external users.

Advanced

1. Review Ansible GitLab modules https://docs.ansible.com/ansible/latest/modules/list_of_all_modules.html
2. Enable Gitlab container registry in: /etc/gitlab/gitlab.rb
3. Read https://about.gitlab.com/devops-tools/teamcity-vs-gitlab.html

GitLab and Kubernetes

Since April 2018, GitLab simplifies process of spinning up a new Kubernetes cluster in Google Kubernetes Engine (GKE) to deploy applications.

Related terms

• U2F
• GitLab groups https://about.gitlab.com/blog/2014/06/30/feature-highlight-groups/
• EKS integration
• Bitbucket
• Azure DevOps Server

See also

• GitLab: Install GitLab, Upgrade GitLab Gitlab runner (changelog), gitlab.rb, .gitlab/, gitlab-ci.yml, gitlab-ctl, gitlab-rake, gitlab-backup, gitlab-rails, GitLab editions, GitLab Security Dashboards, GitLab environments, GitLab environment variables, Auto DevOps, permissions, GitLab Pages, gitlab-rails, GitLab scheduled pipelines, GitLab logs, GitLab changelog , GitLab Release CLI, GitLab Omnibus, GitLab Advanced Search, GitLab container registry, GitLab infrastructure registry
• git, GitHub, GitLab, Gerrit, TeamCity, Jenkins, CircleCI, Bitbucket, AWS Codecommit
• Software development: SDLC, SCM, git, GitHub, GitLab, TeamCity, Jenkins, CircleCI, Rational ClearCase, AWS CodeCommit, VCS, /sys/dev/, DDD, EDA
• Software Composition Analysis (SCA): Flexera, FOSSA, GitLab Ultimate, JFrog Xray, Snyk, Sonatype, Synopsys: Black Duck, Veracode, WhiteHat Security, WhiteSource, Bill of Materials (BOM), Semgrep, Clair
• Continuous integration (Continuous delivery): GitLab CI, TeamCity, Travis CI, Jenkins, CloudBees, AWS CodePipelines, Azure Pipelines, XebiaLabs, Codefresh, GitHub, Pipeline, CircleCI, JFrog Pipelines, Concourse CI, Dagger, Bitbucket Pipelines, Buildkite, Google Cloud Build
• wikipedia:Comparison_of_source-code-hosting_facilities

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Source: https://en.wikiversity.org/wiki/DevOps/GitLab