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Think of a Worker Node as an Airport Terminal
Remember the previous analogy about the Kubernetes control plane being like an air traffic control tower? Think of a worker node as an airport terminal where planes park and passengers board.
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Most Kubernetes clusters run with a minimum of three worker nodes.
This is to help ensure that the cluster is highly available and resilient to issues/outages.
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The Kubelet is an agent that runs on every worker node.
The Kubelet is responsible for making sure that containers in a pod are running and healthy.
The Kubelet communicates directly with the API server in the control plane.
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The container runtime enables the kublet to create containers locally.
The Container Runtime Interface (CRI) can create containers with the engines:
- Containerd
- CRI-O
- Kata Containers
- AWS Firecracker
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The kube proxy helps the worker node communicate with peers
It makes sure pods and services can communicate with other pods and services on nodes and in the control plane.
Each kube-proxy communicates directly with the Kube-apiserver.
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IDEAS CURATED BY
Cybersecurity geek, engineering nerd, productivity enthusiast, devops wannabe, and sci-fi addict.
CURATOR'S NOTE
A brief walk-through of the Kubernetes worker node architecture.
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