Update cheatsheets

kubectl

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# kubectl
+
+> Command-line interface for running commands against Kubernetes clusters.
+> Some subcommands such as `kubectl run` have their own usage documentation.
+> More information: <https://kubernetes.io/docs/reference/kubectl/>.
+
+- List information about a resource with more details:
+
+`kubectl get {{pod|service|deployment|ingress|...}} -o wide`
+
+- Update specified pod with the label 'unhealthy' and the value 'true':
+
+`kubectl label pods {{name}} unhealthy=true`
+
+- List all resources with different types:
+
+`kubectl get all`
+
+- Display resource (CPU/Memory/Storage) usage of nodes or pods:
+
+`kubectl top {{pod|node}}`
+
+- Print the address of the master and cluster services:
+
+`kubectl cluster-info`
+
+- Display an explanation of a specific field:
+
+`kubectl explain {{pods.spec.containers}}`
+
+- Print the logs for a container in a pod or specified resource:
+
+`kubectl logs {{pod_name}}`
+
+- Run command in an existing pod:
+
+`kubectl exec {{pod_name}} -- {{ls /}}`