Flannel is a network fabric for containers that provides a simple and reliable way to connect containers across multiple nodes in a cluster. Its main feature is to establish a virtual network that allows containers to communicate with each other regardless of the host they are running on. Here are some key features of Flannel:

1. Overlay Network: Flannel creates an overlay network that abstracts the underlying network infrastructure, allowing containers to communicate over this virtual network. This enables containers running on different hosts to communicate seamlessly as if they were on the same host.

2. IP Address Management: Flannel assigns each container a unique IP address within the overlay network, ensuring that containers can communicate with each other using standard networking protocols.

3. Backend Support: Flannel supports various backends for networking, such as VXLAN, UDP, and host-gw (host gateway). These backends help in establishing the communication routes between containers running on different hosts.

4. Scalability: Flannel is designed to scale efficiently to large clusters by distributing the networking load across nodes and ensuring that communication between containers remains reliable and performant.

5. Integration with Orchestration Tools: Flannel is commonly used in container orchestration platforms like Kubernetes to provide networking support for containerized applications. It integrates smoothly with these tools to enable network connectivity for microservices and applications deployed in containers.

6. Security: Flannel offers network isolation and security features to ensure that communication between containers is secure and isolated from other network traffic within the cluster.

Overall, Flannel plays a crucial role in container networking by providing a simple yet powerful solution for connecting containers across distributed environments. It simplifies the networking setup for containerized applications and facilitates seamless communication between containers running on different nodes in a cluster.


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Flannel is indeed a network fabric. In the context of container networking, a network fabric like Flannel is responsible for providing the underlying infrastructure that enables communication between containers running on different hosts within a cluster.

Flannel creates an overlay network that abstracts the physical network infrastructure, allowing containers to communicate with each other over a virtual network. This overlay network helps in simplifying networking for containerized applications by providing a seamless and scalable way for containers to interact with one another, regardless of the underlying host they are running on.

By establishing this network fabric, Flannel facilitates the connectivity and communication between containers, enabling them to function as part of a distributed system while abstracting the complexity of networking configurations and routing. This abstraction layer provided by Flannel simplifies the deployment and management of containerized applications across multiple nodes in a cluster.

#cni #flannel #net #k8s #kuber #kube #kubernetes #linux #minikube #k3s #k3d #container #kernel #overlay


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