Cluster

crictl -- for connecting to pods & containers like kubectl but bypassing k8s directly using on the node for container runtime interface
nerdctl -- for building running containers like with docker but on the containerd on k8s node

Stress a node

kubectl run stress --image=alpine --requests=memory=256Mi --limits=memory=256Mi -- /bin/sh -c "apk add --no-cache stress && stress --vm 1 --vm-bytes 300M --timeout 20s"