1 , Docker requirements CentOS system kernel version is higher than 3.10, view the prerequisites of this page to verify your CentOS version supports Docker
By uname -r to see your current kernel version command
uname -r
2 , the use of root permission to log on Centos. Ensure that the yum package up to date.
sudo yum update
3 , uninstall the old version (if an old version installed)
sudo yum remove docker docker-common docker-selinux docker-engine
4 , required installation package, yum-util provide yum-config-manager function, the other two are driven dependent devicemapper
sudo yum install -y yum-utils device-mapper-persistent-data lvm2
5 , the source provided yum
sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
6 , you can view all versions of all warehouse docker, and select a specific version is installed
yum list docker-ce --showduplicates | sort -r
7 , install docker
sudo yum install docker-ce # open only by default since the repo stable repository, where it is installed the latest version of stable 17. A 12.0 the sudo yum the install <FQPN> # example: the install the sudo yum Docker-CE- 17.12 . 0 OF Ce
8 , start and join the boot
sudo systemctl start docker
sudo systemctl enable docker
9 , verify that the installation was successful (there are two parts, client service and installation start indicate docker had been successful)
docker version
10, possible problems
Because the old version before docker already installed, when installed being given as follows
Transaction check error: file /usr/bin/docker from install of docker-ce-17.12.0.ce-1.el7.centos.x86_64 conflicts with file from package docker-common-2:1.12.6-68.gitec8512b.el7.centos.x86_64 file /usr/bin/docker-containerd from install of docker-ce-17.12.0.ce-1.el7.centos.x86_64 conflicts with file from package docker-common-2:1.12.6-68.gitec8512b.el7.centos.x86_64 file /usr/bin/docker-containerd-shim from install of docker-ce-17.12.0.ce-1.el7.centos.x86_64 conflicts with file from package docker-common-2:1.12.6-68.gitec8512b.el7.centos.x86_64 file /usr/bin/dockerd from install of docker-ce-17.12.0.ce-1.el7.centos.x86_64 conflicts with file from package docker-common-2:1.12.6-68.gitec8512b.el7.centos.x86_64
Uninstall the old version of the package
sudo yum erase docker-common-2:1.12.6-68.gitec8512b.el7.centos.x86_64
And then install the new version of docker
yum install docker-ce