Installation and use of docker under centos7

• View Linux version

Docker does not support versions of lower 3.8 kernels

uname -a 

• Check if the previous version is installed

 yum list installed | grep docker

• Uninstall old docker

yum remove -y docker \
                  docker-client \
                  docker-client-latest \
                  docker-common \
                  docker-latest \
                  docker-latest-logrotate \
                  docker-logrotate \
                  docker-selinux \
                  docker-engine-selinux \
                  docker-engine

• Install the necessary software packages for docker

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

• Set up Yum source

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

• View docker version

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

• Select the version to install (the latest installation by default needs to wait for a while, and then press y)

yum install docker-ce

• Start and set boot up

systemctl start docker
systemctl enable docker

• Check whether the installation is successful. Check the installation version

docker version

Installation successful!!!!!