What is the fundamental technical difference between FluxCD and ArgoCD? Pull vs Push model?

The main difference between FluxCD and ArgoCD lies in their configuration synchronization models with the Kubernetes cluster:

• FluxCD uses a pull model: an agent in the cluster periodically polls the repository with manifests and applies changes. This enhances security as the initiative comes from within the cluster.

• ArgoCD supports a push model: the ArgoCD server monitors the state and can initiate the application of changes in the cluster by sending commands directly.

Thus, FluxCD is focused on autonomously maintaining the cluster state, while ArgoCD provides more centralized control and visualization of application states.