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Yin Ding


[KubeEdge](https://kubeedge.io/en/) is an open source framework for edge computing built on Kubernetes that is an incubation-level [CNCF](https://www.cncf.io/projects/kubeedge/) project. KubeEdge helps developers deploy and manage containerized applications in the cloud and on the edge using the same unified platform. KubeEdge handles networking, deployment and data synchronization between edge and cloud infrastructure.



KubeEdge cloud components

KubeEdge cloud components all fall under what is called “CloudCore” which handles communication between the Kubernetes cluster via API and then communicates with the edge devices.

  • CloudHub – Works by establishing a websocket connection with EdgeHub on edge devices and passes changes from the cloud to the edge

  • EdgeController – Handles metadata for nodes and pods on the edge and allows data from cloud to be sent to specific edge nodes

  • DeviceController – Similar to EdgeController and handles metadata for specific devices so data can be synced between edge and cloud

KubeEdge edge components

KubeEdge edge components fall under “EdgeCore” and handle communication between application containers, devices, and the cloud.

  • EdgeHub – Connects to cloud via websocket and is responsible for passing data from devices back to the cloud and cloud data to devices

  • Edged – The agent that runs on edge nodes and what manages the actual containers and pods running on edge devices

  • MetaManager – MetaManager handles message processing between Edged and EdgeHub. MetaManager also provides persistence and querying of metadata via SQLite

  • EventBus – MQTT client that allows edge devices to interact with MQTT servers and gives KubeEdge pub/sub capabilities

  • ServiceBus – HTTP client that allows edge devices to interact with other services over HTTP

  • DeviceTwin – Stores device status and syncs device status with cloud. DeviceTwin also provides the ability to query devices connected to KubeEdge

  • Mappers – KubeEdge Mappers allow edge nodes to communicate over common IoT protocols like Modbus, OPC-UA, and Bluetooth.


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