- Obtain node join token
$kubeadm token list | awk 'NR==2{print $1}'
- Get master hostname
$kubectl get nodes -l node-role.kubernetes.io/master -o jsonpath="{.items[*].metadata.name}"
- List nodes
$kubectl get nodes -o jsonpath="{.items[*].metadata.name}"
- Get master node ip
$kubectl cluster-info | head -1 | grep -oE "[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+"
- Get master node port
$kubectl cluster-info | head -1 | grep -oE ':[0-9]+' | cut -f2 -d":"
- Get master node ip and port string
$kubectl cluster-info | head -1 | grep -oE "[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+:[0-9]+"
- Run a specified image
$kubectl run tempname --rm -it --image=python:2-alpine3.7 --command -- sh
- Expose service to outside
$kubectl edit svc <service name> -n <namespace>
- Add one of the node’s public IP to externalIPs e,g: externalIPs: 192.168.2.131, execute command for specific pod
$kubectl exec <pod name> <command name>