Metrics-server aggregates resource consumption data like CPU and memory usage for Kubernetes nodes, pods and containers. These metrics are collected from the API exposed by the Kubelet on each node.
The metrics server is commonly used by other Kubernetes add ons, such as the Horizontal Pod Autoscaler or the Kubernetes Dashboard.
It is not deployed by default.
In order to deploy metrics-server in your kubernetes master machine clone https://github.com/MithunTechnologiesDevOps/metrics-server.git and run the following command from the top-level directory(metrics-server) of this repository:
$ kubectl apply -f deploy/1.8+/# Display node metrics
$ kubectl top nodes
# Display pod metrics
$ kubectl top podsYou can find the user guide in the official Kubernetes documentation.
The detailed design of the project can be found in the following docs:
For the broader view of monitoring in Kubernetes take a look into Monitoring architecture