Kubernetes

Installation

https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/install-kubeadm/#installing-kubeadm-kubelet-and-kubectl

sudo apt-get update
sudo apt-get install -y apt-transport-https ca-certificates curl
sudo mkdir -p /etc/apt/keyrings
sudo curl -fsSL https://pkgs.k8s.io/core:/stable:/v1.30/deb/Release.key | sudo gpg --dearmor -o /etc/apt/keyrings/kubernetes-apt-keyring.gpg
sudo echo 'deb [signed-by=/etc/apt/keyrings/kubernetes-apt-keyring.gpg] https://pkgs.k8s.io/core:/stable:/v1.30/deb/ /' | sudo tee /etc/apt/sources.list.d/kubernetes.list
sudo apt-get update
sudo apt-get install -y kubelet kubeadm kubectl
sudo apt-mark hold kubelet kubeadm kubectl

Шпаргалка по командам

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minikube start --mount-string="$HOME/go/src/github.com/nginx:/data" --mount --driver=docker
minikube ip
kubectl cluster-info
kubectl create deployment nginx-depl --image=nginx
kubectl get pod
kubectl get replicaset
kubectl get pod <POD-ID> -o wide
kubectl get deployment nginx-depl
kubectl get deployment nginx-depl -o yaml
kubectl edit deployment nginx-depl
kubectl logs <POD-ID>
kubectl describe pod <POD-ID>
kubectl exec -it <POD-ID> -- /bin/bash
kubectl apply -f <CONFIG.YML>
kubectl get deployment nginx-deployment -o yaml
# https://kubernetes.github.io/ingress-nginx/troubleshooting/
kubectl get ingress -n mongo-admin
kubectl describe ing mongo-express-ingress -n mongo-admin
kubectl describe ingress mongo-express-ingress -n mongo-admin
kubectl rollout restart deployment <deployment_name> -n <namespace>

kubectl delete --all pods --namespace=kubernetes-dashboard

System reset

minikube stop
minikube delete
rm -rf ~/.minikube
rm -rf ~/.kube
docker kill $(docker ps -q)
docker rm $(docker ps -a -q)
docker rmi $(docker images -q)
docker system prune

Setup cluster

sudo su
swapoff -a
kubeadm reset
kubeadm init

mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

sudo systemctl start docker
sudo swapoff -a
sudo mv /etc/containerd/config.toml  /etc/containerd/config222.toml
sudo kubeadm reset --force
sudo kubeadm init --pod-network-cidr=10.244.0.0/16
/run/flannel/subnet.env

FLANNEL_NETWORK=10.244.0.0/16
FLANNEL_SUBNET=10.244.0.1/24
FLANNEL_MTU=1450
FLANNEL_IPMASQ=true

kubectl apply -f https://github.com/flannel-io/flannel/releases/latest/download/kube-flannel.yml

kubectl taint nodes --all node-role.kubernetes.io/control-plane-
kubectl taint nodes --all node.kubernetes.io/disk-pressure-
kubectl taint nodes --all node.kubernetes.io/not-ready-

Translate a Docker Compose File to Kubernetes Resources

• https://kubernetes.io/docs/tasks/configure-pod-container/translate-compose-kubernetes/

Helm

https://helm.sh/docs/intro/install/

Clear space / Remove unused images

crictl rmi --prune
docker image prune -a