panchalhimself
Kubernetes addons and metrics server
18 June 2023
What are kubernetes addons ?
k8s addons provide additional functionalities to the kubernetes cluster.
What is a kubernetes metrics server ?
K8s metrics server is an addon that lets you monitor resource usage for pods and nodes using kubectl top command and has support for --sort-by and --selector
Setting up metrics server in local 4 node k8s cluster
Setup k8s cluster using k8s-1.3 notes.
All pods after the cluster setup.
Setting up metrics server documentation:- https://github.com/kubernetes-sigs/metrics-server
kubectl apply -f https://github.com/kubernetes-sigs/metrics-server/releases/latest/download/components.yaml
Turnsout it is notworking, let us inspect as to what actually is going on in the pod.
Let us check the kubectl top nodes command to see what do we get..
Now we need to edit the default component.yaml a little bit
So let us download the file using wget and use vim to edit it.
wget https://github.com/kubernetes-sigs/metrics-server/releases/latest/download/components.yaml
vim components.yaml
modify the -args of containers in spec section to include --kubelet-insecure-tls=true
Let us now deploy this modified components.yaml manifest.
We can see that the pod metrics-server is runnning successfully.
Let us further inspect it.
Yes it is up and running.
Now let us confirm if the kubectl top is working as per expectations.
Yup it is working beautifully like a Baddiee… <3
reference:
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https://github.com/kubernetes-sigs/metrics-server/releases/tag/v0.6.3
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https://github.com/kubernetes-sigs/metrics-server
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https://kubernetes.io/docs/tasks/debug/debug-cluster/resource-metrics-pipeline/#metrics-server