The warnings are not commands that can be executed in the terminal, but rather messages printed by kubeadm during pre-flight checks.
The first warning indicates that a proxy is being used for the connection to the API server and advises you to adjust your proxy settings if this is not intended. The second and third warnings indicate that the specified IP ranges for pods and services are using the same proxy as well, which may cause issues with cluster setup.
The fourth warning suggests that “cgroupfs” is being used as the Docker cgroup driver instead of “systemd”, which is recommended. It provides a link to a guide on how to follow this recommendation.
Finally, the fifth warning indicates that your Docker version (24.0.2) is not on the list of validated versions for Kubernetes v1.18.0, with 19.03 being the latest validated version.




