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Kubernetes
Thu 26 November 2020Installation
In an Ubuntu host CLI, we can use snap to install microk8s for testing. Put the current user in the microk8s group and alias the kubectl command also.
sudo snap install microk8s --classic
sudo usermod -a -G microk8s <username>
echo "alias kubectl='microk8s.kubectl'" >> ~/.bashrc
# Enable CoreDNS:
microk8s.enable dns
# Check status of what is running:
microk8s.status
Basic interaction, exploring resource types:
kubectl get nodes
kubectl get nodes -o wide
kubectl get nodes -o yaml
kubectl describe nodes/<node name>
# Show available resource types:
kubectl api-resources
kubectl explain <type>
kubectl explain node.kind
kubectl explain node --recursive
Namespace basics
kubectl get namespaces
kubectl get pods --all-namespaces
kubectl get pods --namespace default
Run a pod:
# Equivalent to docker run command.
kubectl run pingpong --image alpine ping 1.1.1.1
kubectl logs pod/pingping --tail 1 --follow