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

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
• GitLab CI/CD pipelines: .gitlab-ci.yml https://docs.gitlab.com/ee/ci/yaml/

GitLab Log files

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

Health checks

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

Components

• Sidekiq job scheduler

Editions

• Self-managed: Core, Starter, Premium and Ultimate

Activities

Basic

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

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

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/

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
• 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