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| 1 | +--- |
| 2 | +title: 'is app-of-apps the right pattern for you?' |
| 3 | +date: 2023-05-17 |
| 4 | +author: 'Christoph [GNU:] Görn' |
| 5 | +description: 'The app-of-apps pattern, while a useful concept, does have its pitfalls. The most significant is the complexity it introduces into application management.' |
| 6 | +tags: |
| 7 | + - OperateFirst |
| 8 | + - Operations |
| 9 | + - GitOps |
| 10 | + - ArgoCD |
| 11 | + - Kustomize |
| 12 | + - App-of-Apps |
| 13 | +--- |
| 14 | + |
| 15 | +The app-of-apps pattern, while a useful concept, does have its pitfalls. The most significant is the complexity it |
| 16 | +introduces into application management. When you use the app-of-apps pattern, you're essentially managing applications |
| 17 | +within applications. This can become difficult to navigate, especially when applications begin to scale. |
| 18 | + |
| 19 | +## The Problem with the App-of-Apps Pattern |
| 20 | + |
| 21 | +With a growing number of applications, it becomes challenging to keep track of all the interdependencies. Furthermore, |
| 22 | +when multiple teams are responsible for different applications, the complexity increases exponentially. This can lead |
| 23 | +to configuration drift and potential security risks, as the entire system's stability becomes dependent on each |
| 24 | +individual application. |
| 25 | + |
| 26 | +## Putting the Environment at the Center |
| 27 | + |
| 28 | +In contrast, if we put the environment - the Kubernetes cluster - at the center of our thoughts, we can streamline our |
| 29 | +application management process. This doesn't mean we forget about applications, but rather, we view them as an integral |
| 30 | +part of the environment. |
| 31 | + |
| 32 | +We can think of our environment as a living ecosystem, with applications as various organisms living within it. Rather |
| 33 | +than managing these organisms separately, we manage the ecosystem as a whole, ensuring that it remains healthy and |
| 34 | +balanced. This involves considering the system's stability, security, and ability to scale, as well as the |
| 35 | +interdependencies between various applications. |
| 36 | + |
| 37 | +When we treat the environment as the central focus, we can apply a more holistic management approach. Using tools like |
| 38 | +Kustomize and ArgoCD, we can manage the Kubernetes cluster and its applications as a unified entity. This reduces |
| 39 | +complexity and makes it easier to maintain stability and security. |
| 40 | + |
| 41 | +## The Power of GitOps |
| 42 | + |
| 43 | +By using GitOps, we keep all our application's declarative configurations in a version-controlled system - Git. This |
| 44 | +enables automatic detection and remediation of configuration drift, thereby enhancing security and reliability. |
| 45 | + |
| 46 | +Kustomize allows us to manage Kubernetes configurations through customization, and ArgoCD provides continuous delivery |
| 47 | +capabilities to deploy these configurations to the Kubernetes cluster. When used together, these tools can provide a |
| 48 | +powerful, declarative, and version-controlled approach to managing our Kubernetes environment. |
| 49 | + |
| 50 | +## Conclusion |
| 51 | + |
| 52 | +While the app-of-apps pattern has its merits, it can introduce unnecessary complexity into Kubernetes application |
| 53 | +management. By shifting our focus to the environment - the Kubernetes cluster - and treating it as a unified entity |
| 54 | +with its applications, we can simplify management and enhance stability and security. |
| 55 | + |
| 56 | +The combination of GitOps, Kustomize, and ArgoCD offers a powerful toolkit for managing our environment. They enable a |
| 57 | +declarative, version-controlled approach to configuration management that is both flexible and reliable. This makes it |
| 58 | +easier to maintain our environment and ensures our applications always run in a stable and secure ecosystem. |
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