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An instance of Kubernetes is called a "cluster"
Each cluster has a control plane and at least one worker node.
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Think of the "control plane" like air traffic control at a busy airport.
The control plane helps with overlooking the cluster to make sure nodes and pods are created, modified, and deleted without any issues.
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The control plane consists of several components
- API Server
- etcd
- Kube scheduler
- Kube controller manager
- Cloud controller manager
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API Server
The API Server component exposes the Kubernetes API. kubectl and kubeadm are CLI tools used to communicate with the Kubernetes API via HTTP requests.
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etcd
The etcd component saves all data about the state of the cluster. Only the Kube API server can communicate directly with etcd.
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Kube Scheduler
The Kube scheduler component identifies newly created pods that have not been assigned a worker node and then chooses a node for the pod to run on.
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Kubernetes Controller Manager
The Kubernetes Controller Manager component is a loop that runs continuously and checks the status of a cluster to make sure everything is running properly.
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Cloud Controller Manager
The Cloud Controller Manager component allows the cluster to connect with a cloud provider's API, allowing you to use cloud resources from AWS, GCP, Azure, or any public cloud.
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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 components that make up the Kubernetes control plane.
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