도커 설치 및 데몬실행
# cd /etc/yum.repo.d
# yum -y install wget
# wget https://download.docker.com/linux/centos/docker-ce.repo
# yum search docker-ce
# yum -y install docker-ce
# rpm -qa | grep docker
# systemctl start docker
# systemctl status docker
# systemctl enable docker
동작 확인
# docker version
# docker system info
# docker images
# ls /var/lib/docker
# docker pull centos
# docker run ubuntu /bin/echo "hi docker"
# docker images
# ls /var/lib/docker/overlay2
# du -sh /var/lib/docker/overlay2
# docker rmi ubuntu:latest
# docker rmi centos:latest
# docker rmi ubuntu:latest
# du -sh /var/lib/docker/overlay2
