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This command displays the expiration and remaining validity time for all certificates, including client certificates in the /etc/kubernetes/pki directory and client certificates embedded in KUBECONFIG files (admin.conf, controller-manager.conf, scheduler.conf). ### Manual Certificate Renewal The kubeadm certs renew command allows manual certif ...

Infrastructure Setup Prerequisites Ensure the cluster infrastructure is active on CentOS 7 hosts. The node toploogy includes: Role IP Address Master Node 192.168.138.110 Slave Node 1 192.168.138.111 Slave Node 2 192.138.138.112 1. Database Provisioning 1.1 Resource Isolation Define a dedicated namespace to isolate database resourc ...

Installing the Container RuntimeDocker serves as the underlying container runtime for Kubernetes. Update the package index and install Docker using the following commands:sudo apt-get update sudo apt-get install -y docker.ioOnce installed, ensure the Docker service is running:sudo systemctl start docker sudo systemctl enable dockerDeploying Kub ...

A Job in Kubernetes is designed to execute short-lived, one-time tasks that are meant to run until completion. It ensures that one or more Pods associated with it finish successfully. A Job can be considered a specialized type of Pod that runs a task once and then releases its resources. Kubernetes supports several types of Jobs: Non-parallel ...

Public cloud virtual machines typically route traffic through NAT gateways, which disrupts Kubernetes control plane and etcd peer communication that expects direct layer-3 connectivity. Deploying a cluster on low-spec instances requires explicit runtime configuration, network address translation rules, and careful component selection. Container ...

Objective The goal is to critical evaluate the user experience of KubeKey (kk). As a former community member, the aim is to identify friction points in the installation workflow, specifically when deploying a Kubernetes cluster and integrating KubeSphere. Environment The evaluation was performed on a provided Linux virtual machine (VM) acting a ...

Kubernetes is an open-source container orchestration platform, and kubeadm is a tool provided by the Kubernetes team for quickly setting up a Kubernetes cluster. This article walks through the process of creating a Kubernetes cluster on Ubuntu using kubeadm, covering prerequisites, installing components, initializing the cluster, and adding wor ...

When kube-apiserver fails to start, check the service status: systemctl status kube-apiserver Examine system logs for detailed error messages: cat /var/log/messages | grep kube-apiserver | grep -i error If the log shows Error: --etcd-servers must be specified, verify the configuration file /usr/local/kubernetes/cfg/kube-apiserver.conf. Even i ...

Overview All API objects in Kubernetes are persisted in etcd, but every operation on these objects must go through the kube-apiserver. The API server acts as the gatekeeper for authorization, and Kubernetes uses RBAC (Role-Based Access Control) as its authorization mechanism. Core RBAC Concepts Three fundamental conecpts form the foundation of ...

Environment cat /proc/version Linux version 3.10.0-957.21.3.el7.x86_64 (mockbuild@kbuilder.bsys.centos.org) (gcc version 4.8.5 20150623 (Red Hat 4.8.5-36) (GCC) ) #1 SMP Tue Jun 18 16:35:19 UTC 2019 root@10.101.1.30 ~$ cat /etc/redhat-releace CentOS Linux release 7.5.1804 (Core) cat /etc/redhat-release CentOS Linux release 7.5.1804 (Core) ...