The connection to the server localhost:8080 was refused - did you specify the right host or port?

이 현상은 Docker 데몬이 활성화 되어 있지 않을때 발생합니다.
최초 Kubernetes 설치 후 정상이었지만 reboot 후 "The connection to the server localhost:8080 was refused - did you specify the right host or port?" 이 발생하였다면
아래와 같이 작업을 하면 앞으로 reboot 을 하더라도 정상 출력.

# systemctl restart docker
# systemctl enable docker
Created symlink from /etc/systemd/system/multi-user.target.wants/docker.service to /usr/lib/systemd/system/docker.service.

# systemctl restart containerd
# systemctl enable containerd
Created symlink from /etc/systemd/system/multi-user.target.wants/containerd.service to /usr/lib/systemd/system/containerd.service.