Kubectl Cheat Sheet

Canonical guide:  https://kubernetes.io/docs/reference/kubectl/quick-reference/

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Minikube Installation
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# from the minikube project page
curl -LO https://github.com/kubernetes/minikube/releases/latest/download/minikube-linux-amd64

sudo install minikube-linux-amd64 /usr/local/bin/minikube && rm minikube-linux-amd64

ll /usr/local/bin/minikube 

alias kubectl='minikube kubectl --' 

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Cluster Inspection
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kubectl get pods
kubectl get pods -A
kubectl get services 
kubectl get services hello-minikube

kubectl describe pod headlamp-57fb76fcdb-f6bsl
kubectl describe pod headlamp-57fb76fcdb-f6bsl --namespace headlamp

# Show deployed container digests for all pods

kubectl get pods --namespace=mynmspc -o=jsonpath='{range .items[*]}{"\n"}{.metadata.namespace}{","}{.metadata.name}{","}{range .status.containerStatuses[*]}{.image}{", "}{.imageID}{", "}{end}{end}' | sort

# Locate pods for a service/deployment

kubectl get pods -n <namespace> |grep <name>

# Locate pods for a service

kubectl describe service <service name> -n <namespace>

<identify label>

kubectl get pods -l app.kubernetes.io/<label>=<value>

# Follow log for a pod

kubectl logs -f <podname> -n <namespace>

# Follow logs for multiple pods

kubectl logs -l app.kubernetes.io/<label>=<value> -n <namspace> 

> e.g. follow all logs under the instance selector

kubectl logs -l app.kubernetes.io/instance=rke2-ingress-nginx -n kube-system 

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Download Deployment descriptors
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for d in $(kubectl get deployments -n <namespc>|awk '{print $1}'); do echo "------- App: $d ------"; kubectl get deployment $d -n <namespc> -o yaml > $d.yaml; done;

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Minikube Control
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minikube [start|stop|pause|unpause]

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Add-Ons and Services
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minikube addons list
# install
minikube addons enable headlamp

# run addon with name
minikube service headlamp -n headlamp

# run addon
minikube service hello-minikube

# open browser to endpoint, when available from addon
minikube addons open <name>

# run addon when mk starts
minikube start --addons <name1> --addons <name2>

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Deploy Service
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kubectl create deployment hello-minikube --image=kicbase/echo-server:1.0

kubectl expose deployment hello-minikube --type=NodePort --port=8080

kubectl get services hello-minikube

kubectl port-forward service/hello-minikube 7080:8080

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Headlamp Setup
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# install addon - see above
minikube addons enable headlamp

# run addon with name
minikube service headlamp -n headlamp

# get login token
kubectl create token headlamp-admin -n kube-system

# metrics-server helps w/admin
#  uses image registry.k8s.io/metrics-server/metrics-server:v0.7.2
minikube addons enable metrics-server

# See for setup instructions
https://headlamp.dev/docs/latest/installation

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