Kubernetes demo
First run minikube start so kubectl gets configured to talk to minikube's cluster.
- To make typing faster:
alias k='kubectl' - A shorter equivalent for
--all-namespacesis-A
To get all namespaces:
kubectl get ns
kubectl get namespace
kubectl get namespaces
To get all pods in the default namespace:
kubectl get pods
To get pods in all namespaces:
kubectl get pods --all-namespaces
To get a list of pods in a specific namespace:
kubectl get pods -n namespace_name
To get a details about specific pod we also need to specify its namespace:
kubectl describe pod pod_name -n namespace_name
To list all replica sets:
kubectl get rs
kubectl get rs -o wide
To create a deployment (if not created) or update it (configure it - if it's already been created):
kubectl apply -f my-deployment.yaml
To list all deployments in the default namespace:
kubectl get deploy
kubectl get deployment
kubectl get deployments
kubectl get deploy -o wide
To list all deployments in all namespaces:
kubectl get deploy -o wide --all-namespaces
To get details about particular deployment we also need to specify its namespace:
kubectl describe deployment my-deployment -n namespace_name
To get affinities for all deployments in all namespaces:
kubectl get deploy -o custom-columns=NAME:".metadata.name",AFFINITIES:".spec.template.spec.affinity" --all-namespaces
To scale deployment up or down we can set the number of replicas:
kubectl scale deployment deployment_name --replicas number_of_replicas
To delete deployment:
kubectl delete deployment deployment_name
To list all nodes in the cluster:
kubectl get node
kubectl get nodes
kubectl get nodes -o wide
To get details about specific node:
kubectl describe node node_name
To get information about all Kubernetes objects in the defuault namespace:
kubectl get all
kubectl get all -o wide
To get information about all Kubernetes objects in all namespaces:
kubectl get all -o wide --all-namespaces