Experimenting with Kubernetes on Minikube and Google Cloud Platform
Minikube is a useful starting point for getting acquainted with Kubernetes. It runs a single-node Kubernetes cluster inside a VM on your laptop. Information for getting started with it can be found in the link to its Github page.
A node is a machine in Kubernetes, they may be a physical or virtual machine.
kubectl get nodes - list nodes in your cluster
kubectl get pods - get existing pods
kubectl describe pods - view what containers are inside the pod, and the images
used to build those containers
kubectl logs <pod-name> - retrieve logs for the pod
kubectl exec <pod-name> env - list the environment variables for a pod
kubectl exec -ti <pod-name> bash - start a bash session in a pod
kubectl delete pod <pod-name> - delete pods
kubectl get pods -l <label> -o yaml | grep podIP - check pod IPs
kubectl get services
kubectl expose deployment <name> --type=<type> --port 8080 - create a new service and expose it to external traffic
kubectl get deployments - list deployments
kubectl describe deployment
kubectl delete service <service-name> - delete service \
Existing labels can be found by describe-ing the deployment. The labels can be used to query pods and services using -l command:
kubectl get pods -l run=<name>
kubectl get services -l run=<name>
kubectl label pod <pod-name> <label> - label a pod \
kubectl scale deployments <name> --replicas=3 - scale up/down to the specified number
kubectl get pods -o wide - check number of pods \
kubectl set image deployments/<deployment-name> <deployment-name>=<image-name>:v2\ - update to image of specified version number
kubectl rollout status deployments/<deployment-name> - check the rollout status \
To view to output of a job in the logs of the pods in which it is run:
pods=$(kubectl get pods --show-all --selector=job-name=<job-name> --output=jsonpath={.items..metadata.name})
kubectl logs $pods
kubectl apply -f file-name.yml - add object
kubectl delete -f file-name.yml - delete object \
https://kubernetes.io/ https://github.com/kubernetes/minikube