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Cluster Maintenance (11%)

kubernetes.io > Documentation > Reference > kubectl CLI > kubectl Cheat Sheet

kubernetes.io > Documentation > Tasks > Monitoring, Logging, and Debugging > Get a Shell to a Running Container

kubernetes.io > Documentation > Tasks > Access Applications in a Cluster > Configure Access to Multiple Clusters

kubernetes.io > Documentation > Tasks > Access Applications in a Cluster > Accessing Clusters using API

kubernetes.io > Documentation > Tasks > Access Applications in a Cluster > Use Port Forwarding to Access Applications in a Cluster

Install the metrics server add-on and view resource usage by a pods and nodes in the cluster

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# install the metrics server
kubectl apply -f https://raw.githubusercontent.com/linuxacademy/content-cka-resources/master/metrics-server-components.yaml

# verify that the metrics server is responsive
kubectl get --raw /apis/metrics.k8s.io/

# create a file named my-pod.yml
apiVersion: v1
kind: Pod
metadata:
  name: my-pod
  labels:
    app: metrics-test
spec:
  containers:
  - name: busybox
    image: radial/busyboxplus:curl
    command: ['sh', '-c', 'while true; do sleep 3600; done']

# create a pod from the my-pod.yml file
kubectl apply -f my-pod.yml

# view resources usage by the pods in the cluster
kubectl top pod

# view resource usage by the nodes in the cluster
kubectl top node