K8s: Difference between revisions

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* [https://min.io/docs/minio/kubernetes/upstream/index.html K8s » MinIO]
* [https://min.io/docs/minio/kubernetes/upstream/index.html K8s » MinIO]
* [https://github.com/lensapp/lens K8s » Lens]
* [https://github.com/lensapp/lens K8s » Lens]
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* [https://itnext.io/deciphering-the-kubernetes-networking-maze-navigating-load-balance-bgp-ipvs-and-beyond-7123ef428572 K8s » Deciphering the Networking Maze]
* [https://kubernetes.io/docs/reference/networking/virtual-ips/ K8s » IPVS]
* [https://kubernetes.io/docs/concepts/extend-kubernetes/compute-storage-net/network-plugins/ K8s » CNI]
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Revision as of 22:02, 2 May 2024

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

Retrieved from "https://cdn.chorke.org/weke/index.php?title=K8s&oldid=11412"