cheatsheet for Kubernetes

README.md

@@ -93,6 +93,7 @@ You are more than welcome to contribute and build your own cheatsheet for your f
 * [Docker](tools/docker.sh)
 * [Nanobox Boxfile](tools/nanobox_boxfile.yml)
 * [Nanobox CLI](tools/nanobox_cli.sh)
+* [Kubernetes](tools/kubernetes.sh)
 </details>
 
 
@@ -106,6 +107,9 @@ You are more than welcome to contribute and build your own cheatsheet for your f
     <td align="center">
       <a href="https://crisp.chat/" target="_blank"><img src="https://pbs.twimg.com/profile_images/651629444944273408/r5Kd_ifq_400x400.png" height="64" /></a>
     </td>
+    <td align="center">
+      <a href="https://learnk8s.io/" target="_blank"><img src="https://pbs.twimg.com/profile_images/925127335573114880/9yCkEIe3_400x400.jpg" height="64" /></a>
+    </td>
   </tr>
 </table>
 

tools/kubernetes.sh

@@ -0,0 +1,59 @@
+##############################################################################
+# KUBERNETES
+##############################################################################
+
+##############################################################################
+# CLIENT CONFIGURATION
+##############################################################################
+
+source <(kubectl completion bash)                                               # Setup autocomplete in bash; bash-completion package should be installed first
+kubectl config view                                                             # View Kubernetes config
+kubectl config view -o jsonpath='{.users[?(@.name == "k8s")].user.password}'    # View specific config items by json path
+kubectl config set-credentials kubeuser/foo.kubernetes.com \                    # Set credentials for foo.kuberntes.com
+  --username=kubeuser --password=kubepassword
+
+##############################################################################
+# VIEWING, FINDING RESOURCES
+##############################################################################
+
+kubectl get services                                                                                        # List all services in the namespace
+kubectl get pods -o wide --all-namespaces                                                                   # List all pods in all namespaces in wide format
+kubectl get pods -o json                                                                                    # List all pods in json (or yaml) format
+kubectl describe nodes my-node                                                                              # Describe resource details (node, pod, svc)
+kubectl get services --sort-by=.metadata.name                                                               # List services sorted by name
+kubectl get pods --sort-by='.status.containerStatuses[0].restartCount'                                      # List pods sorted by restart count
+kubectl rolling-update frontend-v1 -f frontend-v2.json                                                      # Rolling update pods for frontend-v1
+kubectl scale --replicas=3 rs/foo                                                                           # Scale a replicaset named 'foo' to 3
+kubectl scale --replicas=3 -f foo.yaml                                                                      # Scale a resource specified in "foo.yaml" to 3
+for i in 0 1; do kubectl exec foo-$i -- sh -c 'echo $(hostname) > /usr/share/nginx/html/index.html'; done   # Execute a command in every pod / replica
+
+##############################################################################
+# MANAGE RESOURCES
+##############################################################################
+
+kubectl explain pods,svc                    # Get documentation for pod or service
+kubectl create -f ./my-manifest.yaml        # Create resource(s) like pods, services or daemonsets
+kubectl apply -f ./my-manifest.yaml         # Apply a configuration to a resource
+kubectl run nginx --image=nginx             # Start a single instance of Nginx
+cat <<EOF | kubectl create -f -
+apiVersion: v1
+kind: Secret
+metadata:
+ name: mysecret
+type: Opaque
+data:
+ password: $(echo "s33msi4" | base64)
+ username: $(echo "jane"| base64)
+EOF                                         # Create a secret with several keys
+kubectl delete -f ./my-manifest.yaml        # Delete a resource
+
+##############################################################################
+# MONITORING & LOGGING
+##############################################################################
+
+kubectl create -f deploy/kube-config/standalone/  # Deploy Heapster from Github repository
+kubectl top node                                  # Show metrics for nodes
+kubectl top pod                                   # Show metrics for pods
+kubectl top pod pod_name --containers             # Show metrics for a given pod and its containers
+kubectl logs pod_name                             # Dump pod logs (stdout)
+kubectl logs -f pod_name -c my-container          # Stream pod container logs (stdout, multi-container case)