AI & Technology

Container Runtime Container Runtime runs on every node in a Kubernetes (k8s) cluster and is responsible for the entire container lifecycle. Docker is currently the most widely used. With the development of container cloud, more and more container runtimes have emerged. To solve the integration problems between these container runtimes and Kubernetes, the community introduced CRI (Container Runtime Interface) in Kubernetes version 1.5 to support more container runtimes. What is CRI CRI is a set of gRPC services defined by Kubernetes....

Kubelet Component Analysis Understanding kubelet The Kubelet component runs on Node nodes, maintaining running Pods and providing Kubernetes runtime environment, mainly accomplishing the following missions: Monitor Pods assigned to this Node Mount volumes required by Pods Download Pod secrets Run containers in Pods through docker/rkt Periodically execute liveness probes defined for containers in Pods Report Pod status to other system components Report Node status The core process of kubelet managing Pods mainly includes three steps....

Scheduler kube-scheduler is responsible for scheduling and assigning Pods to nodes within the cluster. It listens to kube-apiserver, queries for Pods that haven’t been assigned to Nodes, and then assigns nodes to these Pods based on scheduling policies (updating the Pod’s NodeName field). The scheduler needs to fully consider many factors: Fair scheduling; Efficient resource utilization; QoS; affinity and anti-affinity; data locality; inter-workload interference; deadlines. kube-scheduler scheduling is divided into two phases, predicate and priority:...

Deep understanding of Kube-APIServer kube-apiserver is one of the most important core components of Kubernetes and mainly provides the following functions Provides REST API interface for cluster management, including authentication and authorization, data verification, cluster status changes, etc. Provides a hub for data interaction and communication between other modules (other modules query or modify data through API Server, only API Server directly operates etcd) apiserver main functions: Authentication: Use the cluster to determine identity....

Before starting ETCD is the hardest of all components in Kubernetes because ETCD is stateful, not stateless. When I was doing k3s runtime design before, I learned some concepts about ETCD and Raft algorithms. As a prelude to knowledge, please go to [ETCD](https://docker.nsddd.top/Cloud-Native-k8s/24 .html) and Raft algorithm for prelude learning. **This article will explain ETCD and Raft in depth and throughout. And analyze ETCD in depth from the perspective of Kubernetes....

Introduction In the current module’s execution, numerous ports (ws, api, rpc, Prometheus) are passed directly. This approach can be cumbersome and doesn’t align with Kubernetes’ best practices where a pod typically exposes only one port (either 80 or 443). This proposal suggests transitioning to a configuration file-centric approach, while still retaining the capability to pass ports directly when needed. Goals Simplify the port configuration for Kubernetes deployment. Prioritize port values passed as arguments over configuration file values....

Conference and Reference Links Conference reference documents: https://nsddd.notion.site/2899028707604b8090b36677c031cdf8?pvs=4 Video playback: Bilibili: https://www.bilibili.com/video/BV1s8411q7Um/?spm_id_from=333.999.0.0 Comment: I think that middleware can be replaced with https://kubeblocks.io which can help you manage multiple database middlewares. im reads the configuration information, and reads the config/ directory. The config.yaml hard-coded in the code can be automatically divided into rpc for different services, and then unified directories. By default, the directory is read from the binary running path. two floors openim version: https://github....

Introduction: Global Perspective at the Shenzhen Futian Convention and Exhibition Center On December 6, 2023, the GTC 2023 Global Traffic Conference was held in full swing at the Shenzhen Futian Convention and Exhibition Center. This grand event brought together technology elites from around the world to explore the cutting-edge trends and future developments in the internet industry. As a participant, I had the privilege of immersing myself in this exchange between technology and business, particularly the theme of “Focusing on Open Source and Pioneering Global Expansion,” which left a profound impression on me....

Before asking a question Before you ask a technical question via email, newsgroup, or chat room, please do the following: Try searching for answers in old articles on the forum where you are asking a question. Try searching online to find the answer. Try reading the manual to find the answer. Try reading the Frequently Asked Questions document (FAQ) to find the answer. Try to check or experiment on your own to find the answer....

Task Assignment time:Within a week Complete first contribute, purpose: to understand the contribution process of open source projects Complete the construction of sealos development environment Understand the basic usage, core concepts, and functions of core components of kuberentes Basic usage: Create a pod and understand what a pod is Create a deployment and understand the relationship between deployment and pod Create a configmap and understand how to mount configuration files to pods Create a service and access pods in the cluster through service Core concepts and functions of core components: kubectl apiserver controller-manager scheduler kubelet kube-proxy etcd What do these components do?...