Kubernetes

kubectl is a client wrapper around the k8s REST API.

Handy alias for kubectl: k

$ alias k='kubectl --kubeconfig ~/.kube/apprenticeship.tr-lab-chhq-1.yaml'

$ k config set-context --current --namespace=bg-helloworld-reference-impl-ns

Now I don't have to say "-n bg-helloworld-reference-impl-ns" after every command

# SSH to a running pod in a k8s cluster...

$ k get pods

NAME                           READY   STATUS    RESTARTS   AGE
codelabs-wl-77f89d845f-vr649   1/1     Running   0          24h

$ k get pod codelabs-wl-77f89d845f-vr649

$ k exec --stdin --tty codelabs-wl-77f89d845f-vr649 -- /bin/bash

See pod logs:

$ k logs reference-helloworld-wl-597c5744b4-wbwsc --all-containers

kubectl keeps its config in ~/.kube/config. Some top-level config objects:

A list of clusters
A list of users
A list of contexts
The current context
Preferences

kubectl looking-around commands

$ kubectl get pods
$ kubectl describe pod <pod-id>
$ kubectl get namespaces
$ kubectl config current-context

Miscellaneous debugging:

$ kubectl config view   # See what kubectl thinks your config is