升级Fedora并安装Docker

升级Fedora到28

https://fedoraproject.org/wiki/DNF_system_upgrade

$ sudo dnf upgrade --refresh

$ sudo dnf install dnf-plugin-system-upgrade

$ sudo dnf system-upgrade download --refresh --releasever=28 --allowerasing

$ sudo dnf system-upgrade reboot

安装Docker-CE

https://docs.docker.com/install/linux/docker-ce/fedora/

需要Fedora版本 26/27/28

$ sudo dnf remove docker \
                  docker-client \
                  docker-client-latest \
                  docker-common \
                  docker-latest \
                  docker-latest-logrotate \
                  docker-logrotate \
                  docker-selinux \
                  docker-engine-selinux \
                  docker-engine

$ sudo dnf -y install dnf-plugins-core

$ sudo dnf config-manager \
    --add-repo \
   http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo 

官方的repo是"https://download.docker.com/linux/fedora/docker-ce.repo"， 但这里用了阿里云的

$ sudo dnf install docker-ce

$ sudo systemctl start docker

$ sudo docker run hello-world