This article explains how Docker relies on Linux kernel features to isolate processes, introduces containerd as an industrial‑grade container runtime, compares their logging, configuration, CNI handling, and command interfaces, and provides practical tables and examples for migrating from Docker to containerd in Kubernetes environments.
This guide shows Kubernetes operators step‑by‑step how to locate the host process ID of a pod and, conversely, how to identify the pod name from a given PID using kubectl and crictl commands, helping troubleshoot resource spikes in complex clusters.
An in‑depth comparison of Docker and containerd explains their architectural roles in Kubernetes, covering lifecycle management, logging, configuration, stream services, CNI networking, command equivalents, and how tools like crictl and ctr replace Docker CLI functions.
This guide walks through moving a Docker‑Compose‑defined web front‑end and MySQL back‑end to a Kubernetes cluster using containerd as the runtime, covering essential tools, conversion commands, container‑keep‑alive tricks, external service access, and common troubleshooting steps.
This article walks you through configuring containerd image pull acceleration using crictl, ctr, and nerdctl, provides a curated list of accelerated registry mirrors, shows exact command‑line examples, and demonstrates how to verify that the acceleration is effective, helping you speed up container workflows.
Starting with Kubernetes v1.24 the built‑in dockershim is removed, requiring users to switch to a CRI‑compatible runtime such as containerd or CRI‑O—or install cri‑dockerd for Docker compatibility—while updating scripts, logs, and tooling, and using crictl or ctr for debugging and managing containers and pods.
This article explains how containerd works as a high‑level container runtime and demonstrates practical usage of its three command‑line clients—ctr, nerdctl, and crictl—for pulling images, managing containers, debugging Kubernetes pods, and performing low‑level runtime operations.
This guide explains what containerd is, how to manage images and containers with its command‑line clients ctr, nerdctl, and crictl, and provides practical examples of pulling, running, inspecting, and cleaning up containers in a Linux environment.
This guide explains how to switch a Kubernetes cluster’s container runtime from Docker to containerd, including node maintenance, configuration changes, restarting services, verifying the runtime, installing and using crictl for container management, and comparing CLI tools, with detailed command examples.
This guide walks you through replacing Docker with Containerd in Kubernetes, explains the crictl and ctr command‑line tools, shows how to configure Containerd, and demonstrates using nerdctl and BuildKit for image building, tagging, and pushing to Harbor.
This guide explains how to safely switch a Kubernetes cluster's container runtime from Docker to containerd by putting nodes into maintenance mode, updating configuration files, restarting services, verifying the change, and then using crictl for efficient container and pod management, including command comparisons and log handling.
This article explains what k3s is, why it’s named that way, and provides detailed, command‑line instructions for installing k3s on a master node, adding worker nodes, verifying the cluster status, and inspecting running containers, all with example outputs and a link to the official documentation.
This article explains what containerd is, compares it with Docker, describes Kubernetes' CRI support, and provides step‑by‑step commands for using containerd via crictl, showing that migrating from Docker to containerd is simple and resource‑efficient.
This article explains the origins and design of Kubernetes' Container Runtime Interface (CRI), how it abstracts container runtimes, details its lifecycle and streaming operations, reviews major implementations like CRI‑containerd and CRI‑O, and introduces essential debugging tools.
