프로세스 확인 root@coforward:/home/coforward# docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 3ba9c2cde7fb hello-world "/hello" 15 seconds ago Exited (0) 13 seconds ago happy_khayyam 0b508f68aea2 ubuntu "/bin/bash" 44 minutes ago Up 30 minutes youthful_tharp docker 이미지 삭제 root@coforward:/home/coforward# docker rmi hello-world Error response from daemon: conflict: unable to remove re..