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🚀 From Docker to Kubernetes: The Containerization Chronicles
- Docker is used for packaging and running a single application, while Kubernetes helps run multiple apps efficiently, especially when scaling.
- When using Docker, running 'docker run' starts an isolated container with necessary app components, sharing the host OS kernel for lightweight performance.
- Internally, Docker utilizes Linux namespaces, cgroups, and a Union File System to manage containers efficiently.
- Kubernetes complements Docker by managing multiple containers, enabling deployment, scaling, updates, and self-healing in a microservices environment.
- Kubernetes doesn't replace Docker but works with it to orchestrate container lifecycles in a distributed system.
- To deploy a Spring Boot microservice on Kubernetes, build and push a Docker image, then create YAML files for Deployment and Service configurations.
- YAML files specify deployment replicas, container images, ports, and services to expose application functionality.
- For multiple microservices and databases, separate Deployments and Services are created, with optional Ingress to manage external traffic routing.
- Docker builds and runs containers, while Kubernetes orchestrates containers across nodes in production, offering autoscaling and resilience.
- Understanding Docker's internals, Kubernetes basics, deploying microservices, and reading YAML manifests are key takeaways for building cloud-native apps.
- The combined use of Docker and Kubernetes forms the foundation for developing scalable, cloud-native applications.
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