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Tworzenie klastra

Start docker engine

minikube start --nodes 3

minikube dashboard

minikube addons enable metrics-server

Zarządzanie pojedynczym pod

kubectl apply -f <config-file> kubectl port-forward kuard 8080:8080

Pokazać health checks i resource management

Volumes

docker exec -it <node-name> bash echo "Hello world" > /var/lib/kuard/test.txt

Sprawdzić /data/test.txt w UI

ReplicaSet

Manual

kubectl apply -f 3-kuard-rs.yaml

kubectl scale replicasets kuard --replicas=1

kubectl delete replicasets kuard

Autoscale

kubectl apply -f 2-kuard-pod-full.yaml

kubectl autoscale rs kuard --min=2 --max=5 --cpu-percent=50

Deployment

kubectl apply -f 4-kuard-deployment.yaml kubectl get replicasets -o wide

W configu zmienić

  • gcr.io/kuar-demo/kuard-amd64:green na gcr.io/kuar-demo/kuard-amd64:blue
  • Adnotacje change cause

kubectl apply -f 4-kuard-deployment.yaml kubectl get replicasets -o wide

kubectl rollout undo deployment kuard

Service discovery

kubectl create deployment alpaca-prod \
--image=gcr.io/kuar-demo/kuard-amd64:blue \
--port=8080
kubectl scale deployment alpaca-prod --replicas 3
kubectl expose deployment alpaca-prod

ALPACA_POD=$(kubectl get pods -l app=alpaca-prod \
  -o jsonpath='{.items[0].metadata.name}')
kubectl port-forward $ALPACA_POD 48858:8080

W kuard: DNS query alpaca-prod

NodePort

kubectl delete service alpaca-prod
kubectl delete deployment alpaca-prod

kubectl create deployment alpaca-prod \
--image=gcr.io/kuar-demo/kuard-amd64:blue \
--port=8080
kubectl scale deployment alpaca-prod --replicas 3
kubectl expose deployment alpaca-prod --type=NodePort

minikube service alpaca-prod

Manual service discovery

kubectl get pods -o wide --show-labels kubectl get pods -o wide --selector=app=alpaca-prod

DaemonSet

kubectl create -f 5-fluentd-daemonset.yaml

minikube node add

kubectl get pods -o wide

Job

One shot

kubectl apply -f 6-job-oneshot.yaml

kubectl logs oneshot

kubectl delete pod oneshot

StatefulSet (MongoDB)

Zaglądanie do procesów w control plane

etcd:

docker exec -it minikube bash cd /var/lib/minikube/certs/etcd

sudo apt-get update -y
sudo apt-get install -y etcd-client

ETCDCTL_API=3 etcdctl --cacert ca.crt --cert server.crt --key server.key --endpoints https://127.0.0.1:2379 get /registry/ --prefix --keys-only

kube-proxy:

kubectl exec -it -n kube-system kube-proxy-##### -- iptables -L

kindnet:

kubectl exec -it -n kube-system kindnet-##### -- iptables -L