Flannel kubernetes

Flannel kubernetes

flannel is a virtual network that attaches IP addresses to containers

Flannel is responsible for providing a layer 3 IPv4 network between multiple nodes in a cluster. Flannel does not control how containers are networked to the host, only how the traffic is transported between hosts. However, flannel does provide a CNI plugin for Kubernetes and a guidance on integrating with Docker.

CoreOS Flannel vs. Container Networking Alternatives

CoreOS Flannel vs. Container Networking Alternatives

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Kubernetes vs. Docker: What Does it Really Mean?

Kubernetes vs. Docker: What Does it Really Mean?

Containers solved this critical issue of portability allowing you to separate code from the underlying infrastructure it is running on. Developers could package up their application, including all of the bins and libraries it needs to run correctly, into a small container image. In production that container can be run on any computer that has a containerization platform.

Comparing Kubernetes CNI Providers: Flannel, Calico, Canal, and Weave

Comparing Kubernetes CNI Providers: Flannel, Calico, Canal, and Weave

Plugins are responsible for provisioning and managing an IP address to the interface and usually provide functionality related to IP management, IP-per-container assignment, and multi-host connectivity. The container runtime calls the networking plugins to allocate IP addresses and configure networking when the container starts and calls it again when the container is deleted to clean up those resources.

Deploying Docker Compose Applications With Ansible and GitHub Actions

Deploying Docker Compose Applications With Ansible and GitHub Actions

Kubernetes is an excellent tool for managing containerized applications at scale. But as you may know, working with kubernetes is not an easy road, especially the backend networking implementation. I have met many problems in networking and it cost me much time to figure out how it works.

Install Calico for policy and flannel (aka Canal) for networking

Install Calico for policy and flannel (aka Canal) for networking

Kubernetes network policies are implemented by network plugins rather than Kubernetes itself. Simply creating a network policy resource without a network plugin to implement it, will have no effect on network traffic.

Migrate a Kubernetes cluster from flannel/Canal to Calico

Migrate a Kubernetes cluster from flannel/Canal to Calico

If you are already using flannel for networking, it is easy to migrate to Calico’s native VXLAN networking. Calico VXLAN is fully equivalent to flannel vxlan, but you get the benefits of the broader range of features offered by Calico with an active maintainer community.

Deploying Charmed Kubernetes with flannel

You should see kubelet, kube-proxy, and (if you chose Flannel as your networking solution) flanneld host-agent processes running on your node. In addition to this, your Windows node should be listed as “Ready” in your Kubernetes cluster.

How to Understand and Set Up Kubernetes Networking, Including Multiple Networks

Kubernetes networking is a complex topic, if not even the most complicated topic. This post will give you insight on how kubernetes actually creates networks and also how to setup a network for a kubernetes cluster yourself.