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awesome-cheatsheets/tools/kubernetes.sh
2018-03-01 17:34:49 -08:00

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