Kubelet is an essential component of Kubernetes. It is responsible for maintaining the desired state of a cluster, including starting and stopping containers, scheduling and scaling workloads, launching new containers, and ensuring that containers remain available and up-to-date.
It tracks the health of the containers and provides lifecycle events to the rest of the system. For example, if a container fails, it can report that event to the API server, which will then take action. Additionally, it’s responsible for downloading container images from the configured container registry, starting and stopping containers, and collecting metrics and logs from the running containers.
The main task of Kubelet is to ensure that containers retain their desired states as defined in manifests, which include run-time parameters, configurations and other resources. It is responsible for collecting resource usage statistics and reporting them back to the Kubernetes API server. It also monitors the health of the nodes it is running on, such as disk space and memory utilization.
Kubelet is the bridge between the nodes and the rest of the cluster. It is responsible for communication between nodes, nodes and the control plane, and between nodes and external components, such as storage services like Amazon EBS or Amazon S3. It is also responsible for starting, stopping and managing the lifecycle of containers running on nodes. It also manages network policies, ingress, and egress rules.
In short, Kubelet is the glue that binds the entire system together and ensures that all the components of the cluster run smoothly and efficiently.
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