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Container Service for Kubernetes:GitOps overview

Last Updated:Jan 20, 2025

GitOps is a framework that uses Git repositories as the source of truth for deploying applications in a Kubernetes cluster, enabling continuous deployment of applications through automated infrastructure configuration. The Fleet instance hosts Argo CD and support multi-cluster management to achieve continuous delivery across multiple clusters based on GitOps. This solution meets the requirements for high-availability application deployments and multi-cluster distribution of system components. This topic describes GitOps and Distributed Cloud Container Platform for Kubernetes (ACK One) GitOps.

Introduction to GitOps

In the GitOps framework, applications in Kubernetes clusters are deployed only by using Git repositories. GitOps continuously adjusts applications in Kubernetes clusters until the applications reach the expected state in the application templates in the source Git repositories.

Benefits of GitOps

  • Ease of learning: Git is easy to learn and integrate.

  • High reliability: Git repositories support version control, fast rollbacks, and auditing.

  • High security: No permissions on Kubernetes clusters are required for developers to use GitOps. This ensures cluster security. To use GitOps, only permissions on Git repositories are required.

  • Continuous deployment: Applications in Kubernetes clusters are automatically updated based on the source Git repositories. This implements continuous deployment for applications in Kubernetes clusters.

GitOps architecture

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Introduction to ACK One GitOps

The Fleet instances of ACK One are integrated with open source ArgoCD to implement GitOps-based continuous delivery for applications. Argo CD is implemented as a Kubernetes controller that continuously monitors applications and synchronizes applications with their source Git repositories.

Benefits of ACK One GitOps

  • ACK One GitOps hosts Argo CD, providing native CLI and UI experiences.

  • ACK One GitOps provides a separate Argo CD console that is integrated with Alibaba Cloud single sign-on (SSO) and supports permission control among users.

  • ACK One GitOps supports application distribution across clusters. Argo CD is automatically enabled for the clusters that are associated with the Fleet instances of ACK One. The associated clusters use GitOps for application distribution.

  • ACK One GitOps supports Argo CD ApplicationSet to improve the user experience of application distribution across clusters.

  • ACK One GitOps is O&M-free and provides out-of-the-box features.

ACK One GitOps architecture

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Features

Name

Description

References

Work with GitOps

Enable GitOps on a Fleet instance of ACK One to deploy a multi-cluster application.

Getting started with GitOps

Manage users based on GitOps

The types of users that are supported by ACK One GitOps and how to grant permissions to a user.

User management

Log on to the GitOps system

Log on to the GitOps system.

Log on to the GitOps system

Manage source Git repositories

Add a Git repository to or remove a Git repository from the GitOps system, and view Git repositories that are added to the GitOps system.

Repository management

Use GitOps to manage ACK clusters

Use the GitOps system to manage ACK clusters.

Use GitOps to manage ACK clusters

Manage applications based on GitOps

Use the GitOps system to manage applications.