A collection of kubectl commands that are handy.

~/.kube/config

Here’s the Kubernetes config. Note that I believe that minikube creates this on creation:

apiVersion: v1
clusters:
- cluster:
    certificate-authority: /Users/USERNAME/.minikube/ca.crt
    server: https://192.168.99.100:8443
  name: minikube
contexts:
- context:
    cluster: minikube
    user: minikube
  name: minikube
current-context: minikube
kind: Config
preferences: {}
users:
- name: minikube
  user:
    client-certificate: /Users/USERNAME/.minikube/apiserver.crt
    client-key: /Users/USERNAME/.minikube/apiserver.key

commands

• Get pods in wide view (shows what nodes they’re running on):

kubectl get pods --all-namespaces -o wide

• Get Kubernetes nodes labels:

kubectl get nodes --show-labels

• Remove all pods from a node:

kubectl drain ip-10-1-1-2.ec2.internal

• Cordon a node, allowing no more scheduling of pods (but existing pods are unaffected). Note that load balances will NOT route traffic to this node.

kubectl cordon ip-10-1-1-2.ec2.internal

• Uncordon a node, allowing scheduling.

kubectl uncordon ip-10-1-1-2.ec2.internal

• View config (config is stored at ~/.kube/config):

kubectl config view

• If you have multiple clusters, you can specify cluster:

kubectl --cluseter=minikube get pods

• Explain something in Kubernetes, such as a service:

kubectl describe service

• List all services (comes from the expose command):

kubectl get service

• Delete the exposed service (created above in the Installation section):

kubectl delete service hello-minikube

• Bummer, it can’t handle a different etcd SSL config. I’m considering making them the same.
• Once you get Kubernetes control plane deployed, you can run (get componentstatuses will have SSL troubles):

kubectl get componentstatuses

• Get Kubernetes nodes.

kubectl get nodes

• To get Kubernetes Pod logs, first get the pod name:

kubectl get pods --all-namespaces

kubectl logs kube-dns-v18-3y804 --namespace=kube-system -c kubedns

• get Kubernetes pod CIDRs and kubelet IP addresses:

kubectl get nodes --output=jsonpath='{range .items[*]}{.status.addresses[?(@.type=="InternalIP")].address} {.spec.podCIDR} {"\n"}{end}'

• Interactive Kubernetes pod terminal (using CentOS for the additional tools like curl and host):

kubectl run -i -t centos7interactive --restart=Never --image=centos:7 /bin/bash

• Describe Kubernetes Pods (if you specifiy the pod name, it will describe only that pod):

kubectl describe pods