Henry Du Blog

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K8S Runtime: With or Without Docker

K8S Container Runtime Evolution With Docker In Kubernetes v1.20 release note, the major change is to deprecate dockershim, which means, K8S will never use Docker as container runtime. The Kubernetes community has written a blog post about this in detail. The docker runtime is just one component of Docker suite. Developers still use Docker to compile a docker image, and use docker hub to store docker images, as a docker image repository.

Posted by Henry Du on Saturday, December 12, 2020

Cilium: K8S Service Load Balancing - Part 2

Cilium’s service LB based on eBPF/XDP The first part introduced K8S service. Now, we can focus on Cilium’s service LB based on eBPF/XDP. Cilium agent Cilium service LB implements data path for all K8s service types via BPF. cilium-agent on each node watches kube-apiserver. cilium-agent observes the changes in K8S service. cilium-agent dynamically update BPF configuration according to changes in K8S service. As the diagram shown above, there are two components realized the service

Posted by Henry Du on Thursday, December 3, 2020

Cilium: K8S Service Load Balancing - Part 1

Cilium: K8S Service Load Balancing - Part 1 This blog is my reading note when I read K8S Service Load Balancing with BPF & XDP, presented by Daniel Borkmann and Martynas Pumputis in Linux Plumbers Conference. Kubernetes Networking Basic I have summarized kubernetes network feature when I introduced Flannel CNI. Kubenetes network is a flat network in the sense that each pod must be reachable by its IP address within a cluster.

Posted by Henry Du on Monday, November 30, 2020

K3S Supports CNI and Flannel Plugin

K3S Supports Container Network Interface (CNI) and Flannel Introduction Kubernetes network provide the following features: Pods can communicate directly with all other pods on all nodes (no NAT). All nodes agents can communicate with other pods on all nodes (no NAT). The IP that a container sees itself as is the same IP that others see it as. This article explains how every pod is assigned an IP address managed by K3S.

Posted by Henry Du on Monday, November 16, 2020

Running A Simple Operator in Minikube

Running A Simple Operator in Minikube Introduction You may have heard of Kubernetes operator pattern. Maybe you have worked on one of projects that has Custom Resource Definition (CRD). Custom resource definitions are cool things once you define your custom resource on Kubernetes by using YAML. The Kubernetes API server component will implement CRUD API for you automatically. Then, you can use powerful Kubernetes clients, such as kubectl to interact with your own resources managed by Kubernetes.

Posted by Henry Du on Saturday, October 24, 2020

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