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cheatsheet for Kubernetes

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Daniele Polencic 2018-02-24 17:52:31 +00:00
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4
README.md
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@ -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>

59
tools/kubernetes.sh Normal file
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##############################################################################
# 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)