System requirements
Docker CE supports 64-bit version CentOS7, and requires kernel version not lower than 3.10. CentOS 7 meets the minimum kernel requirements,
but due to the relatively low kernel version, some functions (such as overlay2 storage layer driver) cannot be used, and some functions may not be stable.
Uninstall the old version of 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 docker dependencies
yum install - y yum-utils device-mapper-persistent-data lvm2
add docker source
yum-config-manager --add-repo https://mirrors.ustc.edu.cn/docker-ce/linux/centos/docker-ce.repo
Install yum software source cache, and install docker-ce
yum makecache fast && yum install docker-ce -y
start docker -ce
systemctl enable docker
systemctl start docker
create docker user and add to docker user group
groupadd docker
useradd docker -g docker
usermod - aG docker docker