How did you implement migration and integration of Kubernetes into existing infrastructure?

When migrating and implementing Kubernetes into an existing infrastructure, I usually follow these steps:

1. Analysis of the current infrastructure — studying the architecture of applications, dependencies, scaling requirements, and availability.

2. Environment preparation — deploying a Kubernetes cluster (for example, using kubeadm, managed services, or tools like k3s), considering security requirements and network policies.

3. Containerization of applications — if applications are not yet containerized, creating Docker images and optimizing them.

4. Creating Kubernetes manifests — describing Deployment, Service, ConfigMap, Secret, and other resources for managing applications.

5. Step-by-step migration — gradually transferring applications to the cluster, starting with less critical services to minimize risks.

6. Configuring CI/CD — automating the build, testing, and deployment of containers in Kubernetes.

7. Monitoring and logging — implementing tools (Prometheus, Grafana, EFK) to track the cluster and application status.

8. Team training and documentation — providing support and knowledge transfer for successful operation.

This approach allows for a smooth integration of Kubernetes, minimizing downtime and ensuring the stability of services.