About GitOps for Kubernetes • Configuration Management in Kubernetes • GitOps for Kubernetes Essentials • Conclusion Git is the most widely used version control system, with more than 80 percent experience. In the last few years, the number of tools and systems needed to manage version control, configuration management, Infrastructure as Code, CI/CD, and observability have drastically increased. This Thus, to improve developer experience, GitOps emerged where infrastructure and application configuration changes revolve around Git, i.e., the version control ecosystem. The focus is entirely on

unrelated. Is GitOps something that application developers use? Is it for infra- structure folks or system administrators? Is it something you can buy off the shelf? Or is it just a fancy new term for DevOps One day there was an incident where a configuration change took down their entire hosting platform, but the DevOps engineers were able to bring back the system in about 40 minutes. When asked how they cofounder Alexis Richardson called “GitOps.” The DevOps engineers over at Weaveworks came up with a system that allowed them to return their entire platform (not just the workloads running on them) back

delivery teams can release software continuously, and with full confidence in the reliability of the system. THE GITOPS GUIDE TO BUILDING & MANAGING INTERNAL PLATFORMS 3 weave.works ▼ Self-service In the past, the only way a developer could get access to servers, data, or software was to ask a system administrator. In the modern era, however, developers require on-demand access to a variety of tools 3. Enforce zero-trust security 4. Sidecars enable better security A platform is an intricate system and it cannot be bought ready made from any vendor. It’s something that needs to be custom-built

straight-forward: ● Infrastructure as Code: Git is always the source of truth on what happens in the system ● Code changes always go through an automated process ● Deployments, tests, and rollbacks controlled at any moment. Those continuously compare the current state with the desired state to ensure the system is running like expected. The most popular GitOps tools today are ​Flux ​and ​ArgoCD​. As several GitOps has been heralded as a way to decouple CI from deployments. In the classic use of a CI/CD system, the last step in the pipeline is a deployment step. Classic pipeline With GitOps you

treat everything as code – from the application code itself to the underlying infrastructure and configuration – you can keep it in version control. This means the desired state and any changes of an entire ecosystem of cloud native tools are declarative, as opposed to imperative, which allows for configuration to be treated as code. It is this declarative nature that enables the infrastructure to be held make crucial decisions before they deploy new features. Features or other updates like cluster configuration can be pushed to Git and then observed in real-time – and rolled back if necessary. This means

significantly speed up your team’s ability to ship features. eBook 4 The Principles of GitOps The entire system is described declaratively. Kubernetes is just one example of many modern cloud native tools that that are “declarative” and that can be treated as code. Declarative means that configuration is guaranteed by a set of facts instead of by a set of instructions. With your application’s declarations reproduced. --------------- --- The canonical desired system state is versioned in Git. With the declaration of your system stored in a version control system, and serving as your canonical source of truth

apply when implementing and dealing with GitOps. Let’s take a look. Declarative system In the GitOps model, the complete system is configured declaratively. This declarative approach is focused on the result facilitating convenient deployments and rollbacks. The system state is versioned in Git All the declarative states are stored in the version-controlled system, which acts as the single source of truth. With With this version-controlled approach, all the system infrastructure changes are available chronologically, enabling users to identify infrastructure changes over time easily. It is also helpful in: Troubleshooting

truth for declarative infrastructure and application code. In GitOps, the desired state of the system is versioned and stored in a Git repository, and a reconciliation loop continuously monitors and published by the GitOps Working Group: The desired state of a GitOps managed system must be: 1. Declarative A system managed by GitOps must have its desired state expressed declaratively the source. 4. Continuously reconciled Software agents continuously observe the actual system state and attempt to apply the desired state. The Philosophy of GitOps | 07 3 KEY ELEMENTS

code. The system’s entire infrastructure must be described in Git. After a PR is merged, the changes are automatically applied using tools like Weave Kubernetes Platform. Once the system is described require cluster credentials or manual intervention to make a change to the system. As a segregated environment, the system can only be changed through Git, thereby reducing user error and speeding model-based system to configure and define clusters and components. The underlying architecture of WKP is based entirely on GitOps best practices, reducing complexity of configuration management for

Production ⼀條龍 ⼯程師 Configuration Provision Code Deploy CI / CD Production ⼀條龍 ⼯程團隊 Configuration Automation Code Deploy CI / CD Production ⼀條龍 ⼯程團隊 Configuration Automation Ops / Infra GitLab 說的~ GitOps = IaC + MRs + CI/CD Infrastructure as Code Infrastructure System Configuration Application Configuration GitOps = IaC + MRs + CI/CD Merge Requests GitOps = IaC + MRs + CI/CD Continuous