可以通过docker search命令来查找官方仓库中的镜像，并利用docker pull命令来将它下载到本地。

[root@newdocker2 ~]# docker search centos
NAME                                         DESCRIPTION                                     STARS     OFFICIAL   AUTOMATED
centos                                       DEPRECATED; The official build of CentOS.       7516      [OK]       
kasmweb/centos-7-desktop                     CentOS 7 desktop for Kasm Workspaces            33                  
……