Kubectl
sudo curl -fsSLo /etc/apt/keyrings/kubernetes-archive-keyring.gpg\
https://packages.cloud.google.com/apt/doc/apt-key.gpg
cat << EOF | sudo tee /etc/apt/sources.list.d/kubernetes.list >/dev/null
deb [arch=$(dpkg --print-architecture)\
signed-by=/etc/apt/keyrings/kubernetes-archive-keyring.gpg]\
https://apt.kubernetes.io/ kubernetes-xenial main
EOF
sudo apt update
sudo apt install kubectl
Kubeconfig
Kubernetes components like kubelet, kube-controller-manager, or kubectl use the kubeconfig file to interact with the Kubernetes API. Usually, the kubectl or oc commands use the kubeconfig file.
The kubeconfig file's default location for kubectl or oc is the ~/.kube directory. Instead of using the full kubeconfig name, the file is just named config. The default location of the kubeconfig file is ~/.kube/config. There are other ways to specify the kubeconfig location, such as the KUBECONFIG environment variable or the kubectl --kubeconfig parameter.
The kubeconfig file is a YAML file containing groups of clusters, users, and contexts.
- A cluster is a Kubernetes or OpenShift cluster.
- A user is a credential used to interact with the Kubernetes API.
- A context is a combination of a cluster and a user. Every time you execute an
ocorkubectlcommand, you reference a context insidekubeconfig.
export KUBECONFIG=$HOME/.kube/chorke-academia-kubeconfig.yaml
chmod 600 $HOME/.kube/chorke-academia-kubeconfig.yaml
Kube Export
for n in $(kubectl get -o=name pvc,configmap,serviceaccount,\
secret,ingress,service,deployment,statefulset,hpa,job,cronjob);do
mkdir -p $(dirname $n); kubectl get -o=yaml --export $n > $n.yaml
done
for n in $(kubectl get -o=name pvc,configmap,ingress,service,secret,\
deployment,statefulset,hpa,job,cronjob | grep -v 'secret/default-token');do
kubectl get -o=yaml --export $n > $(dirname $n)_$(basename $n).yaml
done
Knowledge
kubectl get deployment -A kubectl get configmap -A kubectl get service -A kubectl get secret -A kubectl get event -A kubectl get pod -A |
kubectl config --kubeconfig=./demo-config view --minify kubectl config view --minify kubectl config view |
kubectl edit deployment -n my-namespace my-app |
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kubectl get deployment -n argocd kubectl get configmap -n argocd kubectl get service -n argocd kubectl get secret -n argocd kubectl get event -n argocd kubectl get pod -n argocd |
kubectl edit deployment -n argocd argocd-redis kubectl edit configmap -n argocd argocd-rbac-cm kubectl edit configmap -n argocd argocd-cm kubectl edit service -n argocd argocd-redis kubectl edit secret -n argocd argocd-secret kubectl edit pod -n argocd argocd argocd-app-ctrl-0 |
kubectl get deployment -n argocd argocd-redis -o yaml kubectl get configmap -n argocd argocd-rbac-cm -o yaml kubectl get configmap -n argocd argocd-cm -o yaml kubectl get service -n argocd argocd-redis -o yaml kubectl get secret -n argocd argocd-secret -o yaml kubectl get pod -n argocd argocd-app-ctrl-0 -o yaml |
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sudo ss -tulwn | grep LISTEN sudo ss -tulpn | grep LISTEN sudo ss -tulpn | grep LISTEN | grep sshd sudo ss -tulpn | grep LISTEN | grep minio sudo ss -tulpn | grep LISTEN | grep resolve |
sudo lsof -i -P -n | grep LISTEN |
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References
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