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Kubernetes Without Docker: Why Container Runtimes Are Changing the Game in 2025
- Kubernetes, as of v1.24, no longer uses Docker as the default container runtime, opting for containerd or CRI-O instead.
- Docker images and Dockerfiles still work with Kubernetes, but Docker is no longer used to run containers within Kubernetes.
- Docker's dockershim was replaced with containerd and CRI-O, which are more lightweight and compliant with Kubernetes' CRI.
- Developers may need to adjust their debugging tools and workflow, as Kubernetes now interacts directly with container runtimes like containerd and CRI-O.
- Various container runtimes such as containerd, CRI-O, gVisor, and WasmEdge offer different features like leaner design, better security, and support for WebAssembly.
- Developers using Kubernetes should familiarize themselves with tools like nerdctl, podman, and learn about runtime-specific behaviors for effective debugging and deployment.
- Cloud providers like AWS, Google, and Azure have migrated to containerd, and developers are advised to align their local development with production runtimes to avoid compatibility issues.
- Understanding container runtimes is crucial for modern development practices, impacting areas such as image building, testing, pipeline security, and deployment strategies.
- The emergence of WebAssembly, gVisor, and multi-runtime environments signals a shift towards modular, secure, and efficient container deployments in the future.
- Developers are encouraged to experiment with new runtimes, optimize CI pipelines, and stay updated on evolving container technologies to stay ahead in the DevOps landscape.
- Embracing the runtime future involves transitioning from Docker to containerd, exploring tools like WasmEdge, and adapting to the changing container orchestration ecosystem.
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