Containerd
containerd is an open-source container runtime daemon that manages container images, execution, storage, supervision, and lifecycle operations on a host.
Acing the Certified Kubernetes Administrator Exam, Second Edition
Containerd is a lightweight, portable container runtime that implements the Container Runtime Interface.
- How it is used
- Runs application containers on Kubernetes worker nodes as the node’s CRI-compatible container engine.
- How deep it goes
- Defines the runtime’s role and demonstrates identification and inspection, stopping short of installation or configuration procedures.
- Examples
- Uses kubectl get no -o wide, kubectl describe po, crictl ps, and kind cluster output to verify runtime behavior.
- What you can do after
- Diagnose runtime selection and inspect CRI-managed containers with kubectl and crictl.
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Road to Kubernetes
containerd is an open-source container runtime that manages the complete container lifecycle on a host system.
- How it is used
- Positions containerd as the lightweight runtime Kubernetes uses to run containers on cluster nodes.
- How deep it goes
- Defines containerd and contrasts it with Docker Engine, but stops short of installation, commands, or runtime internals.
- Examples
- Uses Kubernetes clusters, virtual-machine nodes, Pods, Deployments, and Services to illustrate containerd’s deployment role.
- What you can do after
- Evaluate how containerd fits between Kubernetes and running containers, and distinguish it from Docker Engine.
Server-Side WebAssembly
containerd is a container runtime daemon that manages container lifecycles and coordinates container execution with host and external resources.
- How it is used
- Coordinates container lifecycles, shims, host interactions, and external resources while running Wasm workloads.
- How deep it goes
- Explains the layered architecture and provides installation, verification, image import, and execution commands, while deferring deeper OCI details.
- Examples
- Uses a hello-wasm-container OCI archive and hello-wasm-instance run producing Hello, Wasm containers!
- What you can do after
- Operate/configure containerd with ctr, install the Wasmtime shim, import a WASI image, and run it through the Wasmtime runtime.
Related concepts
- Container Runtime Interfaceimplements · The Container Runtime Interface is a Kubernetes standard interface through which kubelets communicate with and manage container runtimes.
- Dockerkind of · Docker is a platform and ecosystem for building, distributing, and running applications in containers.
- Kubernetesused by · Kubernetes is an open-source platform for orchestrating and automating the deployment, scaling, and management of containerized workloads across computing clusters.
- OpenTelemetryconfigures · OpenTelemetry is an open, vendor-neutral observability standard and framework for instrumenting software and generating, collecting, and exporting telemetry such as traces, metrics, and logs.
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