根据官方文档： 

1.卸载docker旧版本：

sudo yum remove docker \

                  docker-client \                  docker-client-latest \                  docker-common \                  docker-latest \                  docker-latest-logrotate \                  docker-logrotate \                  docker-selinux \                  docker-engine-selinux \                  docker-engine\

2.安装相关工具类：

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

3.配置docker仓库：

sudo yum-config-manager \ --add-repo \

会报以下错误： Loaded plugins: fastestmirror adding repo from: grabbing file to /etc/yum.repos.d/docker-ce.repo Could not fetch/save url to file /etc/yum.repos.d/docker-ce.repo : [Errno 14] curl#35 - "TCP connection reset by peer

这是由于国内访问不到docker官方镜像的缘故 

可以通过aliyun的源来完成：

sudo yum-config-manager --add-repo

出现以下内容则表示docker仓库配置成功：

Loaded plugins: fastestmirror adding repo from: grabbing file to /etc/yum.repos.d/docker-ce.repo repo saved to /etc/yum.repos.d/docker-ce.repo

4.安装docker

sudo yum install docker-ce

出现以下异常：

Loaded plugins: fastestmirrorbase: [Errno 14] curl#35 - "TCP connection reset by peer"Trying other mirror. One of the configured repositories failed (Docker CE Stable - x86_64), and yum doesn't have enough cached data to continue. At this point the only safe thing yum can do is fail. There are a few ways to work "fix" this:

     1. Contact the upstream for the repository and get them to fix the problem.

     2. Reconfigure the baseurl/etc. for the repository, to point to a working

        upstream. This is most often useful if you are using a newer        distribution release than is supported by the repository (and the        packages for the previous distribution release still work).

     3. Run the command with the repository temporarily disabled

            yum --disablerepo=docker-ce-stable ...

     4. Disable the repository permanently, so yum won't use it by default. Yum

        will then just ignore the repository until you permanently enable it        again or use --enablerepo for temporary usage:

            yum-config-manager --disable docker-ce-stable

        or            subscription-manager repos --disable=docker-ce-stable

     5. Configure the failing repository to be skipped, if it is unavailable.

        Note that yum will try to contact the repo. when it runs most commands,        so will have to try and fail each time (and thus. yum will be be much        slower). If it is a very temporary problem though, this is often a nice        compromise:

            yum-config-manager --save --setopt=docker-ce-stable.skip_if_unavailable=true

failure: repodata/repomd.xml from docker-ce-stable: [Errno 256] No more mirrors to try.

: [Errno 14] curl#35 - "TCP connection reset by peer"

[root@localhost yum.repos.d]# systemctl restart docker 

[root@localhost yum.repos.d]# systemctl status docker