yum -y install docker-ce
docker安装报错
—> Package docker-scan-plugin.x86_64 0:0.8.0-3.el7 will be installed
—> Package libcgroup.x86_64 0:0.41-21.el7 will be installed
—> Package libseccomp.x86_64 0:2.3.1-4.el7 will be installed
–> Finished Dependency Resolution
Error: Package: 3:docker-ce-20.10.8-3.el7.x86_64 (docker-ce-stable)
Requires: container-selinux >= 2:2.74
Error: Package: docker-ce-rootless-extras-20.10.8-3.el7.x86_64 (docker-ce-stable)
Requires: fuse-overlayfs >= 0.7
Error: Package: docker-ce-rootless-extras-20.10.8-3.el7.x86_64 (docker-ce-stable)
Requires: slirp4netns >= 0.4
Error: Package: containerd.io-1.4.9-3.1.el7.x86_64 (docker-ce-stable)

解决办法：

#进入yum 源配置文件夹
cd /etc/yum.repos.d
mv CentOS-Base.repo CentOS-Base.repo_bak

在文件顶部添加一个条目/etc/yum.repos.d/docker-ce.repo，内容如下：
[centos-extras]
name=Centos extras - $basearch
baseurl=http://mirror.centos.org/centos/7/extras/x86_64
enabled=1
gpgcheck=0

保存退出

#然后安装命令：
yum -y install slirp4netns fuse-overlayfs container-selinux

#在安装docker-ce
yum -y install docker-ce

#查看docker的版本
docker -v