kubectl get pods -A --field-selector=status.phase!=Running | grep -v Complete

kubectl get no -o json | \
  jq -r '.items | sort_by(.status.capacity.memory)[]|[.metadata.name,.status.capacity.memory]| @tsv'

kubectl get po -o json --all-namespaces | \
  jq '.items | group_by(.spec.nodeName) | map({"nodeName": .[0].spec.nodeName, "count": length}) | sort_by(.count)'

ns=my-namespace
pod_template=my-pod
kubectl get node | grep -v "$(kubectl -n ${ns} get pod --all-namespaces -o wide | fgrep ${pod_template} | awk '{print $8}' | xargs -n 1 echo -n "\|" | sed 's/[[:space:]]*//g')"

# cpu
kubectl top pods -A | sort --reverse --key 3 --numeric
# memory
kubectl top pods -A | sort --reverse --key 4 --numeric

kubectl get pods --sort-by=.status.containerStatuses[0].restartCount

kubectl -n jaeger get svc -o wide
NAME                            TYPE        CLUSTER-IP        EXTERNAL-IP   PORT(S)                                  AGE   SELECTOR
jaeger-cassandra                ClusterIP   None              <none>        9042/TCP                                 77d   app=cassandracluster,cassandracluster=jaeger-cassandra,cluster=jaeger-cassandra

kubectl get pods -n my-namespace -o=custom-columns='NAME:spec.containers[*].name,MEMREQ:spec.containers[*].resources.requests.memory,MEMLIM:spec.containers[*].resources.limits.memory,CPUREQ:spec.containers[*].resources.requests.cpu,CPULIM:spec.containers[*].resources.limits.cpu'

kubectl run test --image=grafana/grafana --dry-run -o yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  creationTimestamp: null
  labels:
    run: test
  name: test
spec:
  replicas: 1
  selector:
    matchLabels:
      run: test
  strategy: {}
  template:
    metadata:
      creationTimestamp: null
      labels:
        run: test
    spec:
      containers:
      - image: grafana/grafana
        name: test
        resources: {}
status: {}

kubectl explain hpa
KIND:     HorizontalPodAutoscaler
VERSION:  autoscaling/v1
DESCRIPTION:
     configuration of a horizontal pod autoscaler.
FIELDS:
   apiVersion    <string>
     APIVersion defines the versioned schema of this representation of an
     object. Servers should convert recognized schemas to the latest internal
     value, and may reject unrecognized values. More info:
     https://git.k8s.io/community/contributors/devel/api-conventions.md#resources
   kind    <string>
     Kind is a string value representing the REST resource this object
     represents. Servers may infer this from the endpoint the client submits
     requests to. Cannot be updated. In CamelCase. More info:
     https://git.k8s.io/community/contributors/devel/api-conventions.md#types-kinds
   metadata    <Object>
     Standard object metadata. More info:
     https://git.k8s.io/community/contributors/devel/api-conventions.md#metadata
   spec    <Object>
     behaviour of autoscaler. More info:
     https://git.k8s.io/community/contributors/devel/api-conventions.md#spec-and-status.
   status    <Object>
     current information about the autoscaler.

kubectl get nodes -o json | \
  jq -r '.items[].status.addresses[]? | select (.type == "InternalIP") | .address' | \
  paste -sd "\n" -

kubectl get --all-namespaces svc -o json | \
  jq -r '.items[] | [.metadata.name,([.spec.ports[].nodePort | tostring ] | join("|"))]| @tsv'

kubectl get nodes -o jsonpath='{.items[*].spec.podCIDR}' | tr " " "\n"

kubectl -n my-namespace logs -f my-pod --timestamps
2020-07-08T14:01:59.581788788Z fail: Microsoft.EntityFrameworkCore.Query[10100]

kubectl -n my-namespace logs -f my-pod --tail=50

kubectl -n my-namespace logs -f my-pod --all-containers

kubectl -n my-namespace logs -f -l app=nginx

kubectl -n my-namespace logs my-pod --previous

kubectl get secrets -o json --namespace namespace-old | \
  jq '.items[].metadata.namespace = "namespace-new"' | \
  kubectl create-f  -

openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout tls.key -out tls.crt -subj "/CN=grafana.mysite.ru/O=MyOrganization"
kubectl -n myapp create secret tls selfsecret --key tls.key --cert tls.crt