此问题是因为Docker安装后未启动所致，执行以下命令启动docker：

systemctl start docker.service

具体日志如下：

Connecting to 172.16.10.217:...

Connection established.

To escape to local shell, press 'Ctrl+Alt+]'.

Last login: Fri Aug  ::

[root@localhost ~]# docker ps

Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

[root@localhost ~]# systemctl start docker.service

[root@localhost ~]# docker ps

CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES

[root@localhost ~]# docker images

REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE

[root@localhost ~]#

以上显示已经成功启动。

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