Configurar cluster
Configurar kubectl para acessar um Azure AKS
az aks get-credentials -g ${GROUP} -n ${CLUSTER}
Ver configurações do kubectl
kubectl config view
Adicionando um novo cluster ao kubectl
# Add a user/principal that will be used when connecting to the cluster
kubectl config set-credentials kubeuser/foo.com --username=kubeuser --password=kubepassword
# Point to a cluster
kubectl config set-cluster foo.com --insecure-skip-tls-verify=true --server=https://foo.com
# This context points to the cluster with a specific user
kubectl config set-context default/foo.com/kubeuser --user=kubeuser/foo.com --namespace=default --cluster=foo.com
# Use this specific context
kubectl config use-context default/foo.com/kubeuser
Trocando de cluster
# Mostrando os clusters configurados no ~/.kube
kubectl config get-contexts
# Mostrando o contexto atual
kubectl config current-context
# Trocando de contexto
kubectl config use-context CONTEXT_NAME
Namespaces
Criando um namespace
kubectl create namespace ${NAMESPACE}
Trocando o namespace corrente
kubectl config set-context --current --namespace=${NAMESPACE}
Pods
Procurar (por label)
kubectl get pods -l app=MY-APP
POD_NAME=$(kubectl get pods -o=jsonpath='{.items[?(@.metadata.labels.app=="MY-APP")].metadata.name}')
Describe (ver eventos)
kubectl describe pod $POD_NAME
Logs (da aplicação)
kubectl logs $POD_NAME
Mostrar os nodes de execução dos pods
kubectl get pods -o=wide
# Filtrar pelo nome do node
kubectl get pods --field-selector spec.nodeName=$NODE_NAME
Terminal
Abrir terminal num pod
kubectl exec --stdin --tty $POD_NAME -- /bin/bash
Se estiver usando um terminal Git-bash ou MinGW, colocar a variável
MSYS_NO_PATHCONV:MSYS_NO_PATHCONV=1 kubectl exec --stdin --tty $POD_NAME -- /bin/bash
Service
Acessando um serviço
kubectl get svc ${SERVICE_NAME}
EXTERNAL_IP=$(kubectl get svc ${SERVICE_NAME} -o=jsonpath='{.status.loadBalancer.ingress[0].ip}')
curl http: ${EXTERNAL_IP}/api/v1/hello
Expondo um endereço:
kubectl port-forward service/${SERVICE_NAME} 9200:9200
Logs
kubectl logs -p $POD --all-containers --previous=false
Restart pods
Sem downtime:
kubectl rollout restart deployment <deployment_name>
Parando todos pods e depois reiniciando todos:
kubectl scale deployment <deployment name> - replicas=0
kubectl scale deployment <deployment name> - replicas=1
Alterando uma variável associada ao pod:
kubectl set env deployment <deployment name> LAST_START_DATE="$(date)"
Selecionando um pod específico:
kubectl delete pod <pod_name>
Selecionando todos pods com label:
kubectl delete pod -l "app:myapp"
Performance
Mostra consumo de CPU e MEMORY de pods
kubectl top pod
kubectl top pod POD_ID
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