How to install docker on centos7

1. Docker requires that the kernel version of the CentOS system is higher than 3.10

Check your current kernel version through the uname -r command

$ uname -r

2. Log in to Centos with root privileges. Make sure the yum package is updated to the latest.

$ sudo yum update

3. Uninstall the old version (if you have installed an old version)

$ sudo yum remove docker  docker-common docker-selinux docker-engine

4. Install the required software packages, yum-util provides the yum-config-manager function, and the other two are The devicemapper driver depends on

$ sudo yum install -y yum-utils device-mapper-persistent-data lvm2

5. Set up the yum source

$ sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

6. You can view all docker versions in all warehouses and select a specific version to install

$ yum list docker-ce --showduplicates | sort -r

7. Install docker

$ sudo yum install docker-ce  #由于repo中默认只开启stable仓库，故这里安装的是最新稳定版17.12.0
$ sudo yum install <FQPN>  # 例如：sudo yum install docker-ce-17.12.0.ce

8. Start and join the boot startup

$ sudo systemctl start docker
$ sudo systemctl enable docker

9. Verify whether the installation is successful (the client and service parts indicate that the docker installation and startup are successful)

$ docker version

Recommended related tutorials: centos tutorial

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