Getting Started

eval $(minikube -p minikube docker-env)

Names

RFC 1123 Label Names Some resource types require their names to follow the DNS label standard as defined in RFC 1123. This means the name must:

• contain at most 63 characters
• contain only lowercase alphanumeric characters or '-'
• start with an alphanumeric character
• end with an alphanumeric character

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Pods

Generate a pod yaml file

kubectl run --image nginx nginx --dry-run=client -oyaml nginx
kubectl run --image nginx nginx --dry-run=client -oyaml nginx > pod.yaml

Create a pod using the yaml file

kubectl apply -f pod.yaml

Get the pod

kubectl get pods -A

Get logs from the pod

kubectl logs pods/nginx

Get the pod's IP address

kubectl get pods -o wide

DNS do Pod:

<pod-ip-address>.<namespace>.pod.cluster.local

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Deployment

Create deployment file

kubectl create deployment --image nginx nginx --dry-run=client -oyaml > deployment.yaml

Update the deployment image

kubectl set image deployment/nginx-deployment nginx=nginx:1.16.1

Obter detalhes do deployment

kubectl describe deployment nginx-deployment

Rollback the deployment

kubectl rollout status deployment/nginx-deployment

kubectl rollout history deployment/nginx-deployment
kubectl rollout history deployment/nginx-deployment --revision=2

kubectl rollout undo deployment/nginx-deployment
kubectl rollout undo deployment/nginx-deployment --to-revision=2

Redimensionar o deployment

kubectl scale deployment/nginx-deployment --replicas=10

Autoescalar o deployment (Necessário habilitar o escalonamento automático horizontal de pods no cluster - HPA)

kubectl autoscale deployment/nginx-deployment --min=10 --max=15 --cpu-percent=80

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Services

DNS do Service:

<service-name>.<namespace>.svc.cluster.local

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kubectl describe node <node-name>

Access etcd

kubectl -n kube-system exec -it etcd-minikube -- sh -c "ETCDCTL_API=3 ETCDCTL_CACERT=/var/lib/minikube/certs/etcd/ca.crt ETCDCTL_CERT=/var/lib/minikube/certs/etcd/server.crt ETCDCTL_KEY=/var/lib/minikube/certs/etcd/server.key etcdctl get /registry/deployments/default/nginx-deployment"

kubectl expose deployment/nginx-deployment --type=NodePort

minikube service --all

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Kubernetes API

Verbosidade lvl 6

kubectl get pods -v6

Obter o OpenAPI do cluster

kubectl proxy --port=8080
curl http://localhost:8080/openapi/v3 > openapi.json

Obter a lista de pods através da API Rest

curl http://127.0.0.1:8080/api/v1/namespaces/default/pods