Merge pull request #15674 from erictune/cheatsheet

docs/user-guide/kubectl-cheatsheet.md

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+
+<h2>PLEASE NOTE: This document applies to the HEAD of the source tree</h2>
+
+If you are using a released version of Kubernetes, you should
+refer to the docs that go with that version.
+
+<strong>
+The latest 1.0.x release of this document can be found
+[here](http://releases.k8s.io/release-1.0/docs/user-guide/kubectl-cheatsheet.md).
+
+Documentation for other releases can be found at
+[releases.k8s.io](http://releases.k8s.io).
+</strong>
+--
+
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+
+
+An assortment of compact kubectl examples
+
+See also: [Kubectl overview](kubectl-overview.md) and [JsonPath guide](jsonpath.md).
+
+## Creating Objects
+
+```console
+$ kubectl create -f ./file.yml                   # create resource(s) in a json or yaml file
+
+$ kubectl create -f ./file1.yml -f ./file2.yaml  # create resource(s) in a json or yaml file
+
+$ kubectl create -f ./dir                        # create resources in all .json, .yml, and .yaml files in dir
+
+# Create from a URL
+$ kubectl create -f http://www.fpaste.org/279276/48569091/raw/
+
+# Create multiple YAML objects from stdin
+$ cat <<EOF | kubectl create -f -
+apiVersion: v1
+kind: Pod
+metadata:
+  name: busybox-sleep
+spec:
+  containers:
+  - name: busybox
+    image: busybox
+    args:
+    - sleep
+    - "1000000"
+---
+apiVersion: v1
+kind: Pod
+metadata:
+  name: busybox-sleep-less
+spec:
+  containers:
+  - name: busybox
+    image: busybox
+    args:
+    - sleep
+    - "1000"
+EOF
+
+# Create a secret with several keys
+$ cat <<EOF | kubectl create -f -
+apiVersion: v1
+kind: Secret
+metadata:
+  name: mysecret
+type: Opaque
+data:
+  password: $(echo "s33msi4" | base64)
+  username: $(echo "jane" | base64)
+EOF
+
+# TODO: kubectl-explain example
+```
+
+
+## Viewing, Finding Resources
+
+```console
+# Columnar output
+$ kubectl get services                          # List all services in the namespace
+$ kubectl get pods --all-namespaces             # List all pods in all namespaces
+$ kubectl get pods -o wide                      # List all pods in the namespace, with more details
+$ kubectl get rc <rc-name>                      # List a particular replication controller
+$ kubectl get replicationcontroller <rc-name>   # List a particular RC
+
+# Verbose output
+$ kubectl describe nodes <node-name>
+$ kubectl describe pods <pod-name>
+$ kubectl describe pods/<pod-name>              # Equivalent to previous
+$ kubectl describe pods <rc-name>               # Lists pods created by <rc-name> using common prefix
+
+# List Services Sorted by Name
+$ kubectl get services --sort-by=.metadata.name
+
+# List pods Sorted by Restart Count
+$ kubectl get pods --sort-by=.status.containerStatuses[0].restartCount
+
+# Get the version label of all pods with label app=cassandra
+$ kubectl get pods --selector=app=cassandra rc -o 'jsonpath={.items[*].metadata.labels.version}'
+
+# Get ExternalIPs of all nodes
+$ kubectl get nodes -o jsonpath='{.items[*].status.addresses[?(@.type=ExternalIP)].address}'
+
+# List Names of Pods that belong to Particular RC
+# "jq" command useful for transformations that are too complex for jsonpath
+$ sel=$(./kubectl get rc <rc-name> --output=json | jq -j '.spec.selector | to_entries | .[] | "\(.key)=\(.value),"')
+$ sel=${sel%?} # Remove trailing comma
+$ pods=$(kubectl get pods --selector=$sel --output=jsonpath={.items..metadata.name})`
+
+# Check which nodes are ready
+$ kubectl get nodes -o jsonpath='{range .items[*]}{@.metadata.name}:{range @.status.conditions[*]}{@.type}={@.status};{end}{end}'| tr ';' "\n"  | grep "Ready=True" 
+```
+
+## Modifying and Deleting Resources
+
+```console
+$ kubectl label pods <pod-name> new-label=awesome                  # Add a Label
+$ kubectl annotate pods <pod-name> icon-url=http://goo.gl/XXBTWq   # Add an annotation
+
+# TODO: examples of kubectl edit, patch, delete, replace, scale, and rolling-update commands.
+```
+
+## Interacting with running Pods
+
+```console
+$ kubectl logs <pod-name>         # dump pod logs (stdout)
+$ kubectl logs -f <pod-name>      # stream pod logs (stdout) until canceled (ctrl-c) or timeout
+
+$ kubectl run -i --tty busybox --image=busybox -- sh      # Run pod as interactive shell
+$ kubectl attach <podname> -i                             # Attach to Running Container
+$ kubectl port-forward <podname> <local-and-remote-port>  # Forward port of Pod to your local machine
+$ kubectl port-forward <servicename> <port>               # Forward port to service
+$ kubectl exec <pod-name> -- ls /                         # Run command in existing pod (1 container case) 
+$ kubectl exec <pod-name> -c <container-name> -- ls /     # Run command in existing pod (multi-container case) 
+```
+
+
+
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