K8s

K8s Lens

# install from snapcraft
sudo snap install kontena-lens --classic

# license version
curl -fsSL https://downloads.k8slens.dev/keys/gpg\
| sudo gpg --dearmor -o /etc/apt/keyrings/k8slens.gpg

cat << EOF | sudo tee /etc/apt/sources.list.d/k8slens.list >/dev/null
deb [arch=$(dpkg --print-architecture)\
 signed-by=/etc/apt/keyrings/k8slens.gpg]\
 https://downloads.k8slens.dev/apt/debian stable main
EOF

sudo apt install lens
lens-desktop

Kind

Pod PersistentVolume PersistentVolumeClaim Deployment DeploymentConfig ReplicaSet ReplicationController StorageClass

Volume

cat <<EOF | kubectl apply -f - apiVersion: v1 kind: PersistentVolume metadata: name: chorke-pv spec: capacity: storage: 10Gi volumeMode: Filesystem accessModes: - ReadWriteOnce persistentVolumeReclaimPolicy: Retain storageClassName: chorke-local-storage hostPath: path: /home/shahed/.chorke/academia/var/k8s nodeAffinity: required: nodeSelectorTerms: - matchExpressions: - key: k8s.io/minikube-hostpath operator: In values: - node-hostname --- apiVersion: v1 kind: PersistentVolumeClaim metadata: name: chorke-pvc spec: accessModes: - ReadWriteOnce resources: requests: storage: 10Gi storageClassName: chorke-local-storage EOF	cat <<EOF | kubectl delete -f - apiVersion: v1 kind: PersistentVolume metadata: name: chorke-pv spec: capacity: storage: 10Gi volumeMode: Filesystem accessModes: - ReadWriteOnce persistentVolumeReclaimPolicy: Retain storageClassName: chorke-local-storage hostPath: path: /home/shahed/.chorke/academia/var/k8s nodeAffinity: required: nodeSelectorTerms: - matchExpressions: - key: k8s.io/minikube-hostpath operator: In values: - node-hostname --- apiVersion: v1 kind: PersistentVolumeClaim metadata: name: chorke-pvc spec: accessModes: - ReadWriteOnce resources: requests: storage: 10Gi storageClassName: chorke-local-storage EOF

Storage

1. Ceph RBD
2. GlusterFS
3. OpenEBS
4. Longhorn
5. Rook

Argo CD

kubectl create namespace argocd
kubectl get namespace -A

kubectl apply -n argocd -f https://raw.githubusercontent.com/argoproj/argo-cd/stable/manifests/install.yaml

kubectl get -n=argocd pod
kubectl get -n=argocd service -n argocd
kubectl port-forward -n=argocd service/argocd-server 8080:80

kubectl get -n=argocd -o=yaml secret argocd-initial-admin-secret
echo  RE83Uk81QTU5clZyLTlsdg== | base64 --decode
https://localhost:8080/login

---

kubectl get -n=argocd configmap kubectl get -n=argocd deployment kubectl get -n=argocd service kubectl get -n=argocd secret kubectl get -n=argocd event kubectl get -n=argocd pod

kubectl edit -n=argocd configmap argocd-rbac-cm kubectl edit -n=argocd configmap argocd-cm kubectl edit -n=argocd deployment argocd-redis kubectl edit -n=argocd service argocd-redis kubectl edit -n=argocd secret argocd-secret kubectl edit -n=argocd pod argocd-app-ctrl-0

kubectl get -n=argocd -o=yaml configmap argocd-rbac-cm kubectl get -n=argocd -o=yaml configmap argocd-cm kubectl get -n=argocd -o=yaml deployment argocd-redis kubectl get -n=argocd -o=yaml service argocd-redis kubectl get -n=argocd -o=yaml secret argocd-secret kubectl get -n=argocd -o=yaml pod argocd-app-ctrl-0

Docker Config

kubectl create secret -n chorke generic image-pull-secret --from-file=.dockerconfigjson=${HOME}/.docker/config.json --type=kubernetes.io/dockerconfigjson
kubectl get    secret -n chorke image-pull-secret -o "jsonpath={.data.\.dockerconfigjson}" | base64 --decode
kubectl get    secret -n chorke image-pull-secret -o yaml
kubectl delete secret -n chorke image-pull-secret

kubectl get pods -A -o jsonpath='{range .items[*]}{"\n"}{.metadata.name}{":\t"}{range .spec.containers[*]}{.image}{", "}{end}{end}' |sort
kubectl get pods -A -o jsonpath="{.items[*].spec.containers[*].image}" |tr -s 'space:' '\n' |sort |uniq -c

kubectl delete pod academia-<hash> -n chorke --force --grace-period=0
kubectl delete pod academia-<hash> -n chorke

kubectl get pod academia-<hash> -n chorke -o yaml
kubectl describe pod academia-<hash> -n chorke
kubectl edit pod academia-<hash> -n chorke
kubectl get pod academia-<hash> -n chorke
kubectl logs academia-<hash> -n chorke
kubectl get events -n chorke

Knowledge

snap services maas snap services juju snap services lxd	minikube addons enable default-storageclass minikube addons enable metrics-server minikube addons enable metallb	minikube addons configure metallb minikube addons enable olm minikube addons list
kubectl exec -it <pod-nmae-hash> -- bash kubectl exec -it <pod-name-hash> -n <ns> -- bash kubectl exec -it <pod-name-hash> -n <ns> -- printenv	kubectl logs <pod-nmae-hash> kubectl logs <pod-nmae-hash> -n <ns> kubectl logs <pod-nmae-hash> -n <ns> -p	minikube addons enable ingress kubectl get pods -n ingress-nginx kubectl logs <pod-nmae-hash> -c <image-name> -n <ns>
minikube addons enable ingress-dns nslookup academia.local $(minikube ip) kubectl get configmap coredns -n kube-system -o yaml

References

K8s » CrashLoopBackOff » Medium K8s » Kubeadm » Setup Cluster K8s » What Deployments Are K8s » Volumes » Ephemeral K8s » Volumes » Persistent K8s » Volumes » Projected K8s » Minikube » Ingress K8s » Use Volumes K8s » Kustomize K8s » Volumes	K8s » CrashLoopBackOff » GroundCover K8s » CrashLoopBackOff » Spacelift K8s » CrashLoopBackOff » Blinkops K8s » DNS Service » Customizing K8s » DNS for Services and Pods K8s » Connect to Host Database K8s » Minikube » Ingress DNS K8s » Keycloak » Hostname K8s » Interactive Pod K8s » Restart Pods	K8s » MicroK8s vs K3s vs Minikube K8s » Cheapest Cluster $1/Day K8s » Ingress » Cert Manager K8s » Lens » Getting Started K8s » Ingress » Letsencrypt K8s » OpenLens K8s » MicroK8s K8s » Rancher K8s » MinIO K8s » Lens
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