docker的image id和digest

既然你看到这篇文章，你肯定已经用过Docker，并且Pull过镜像，所以下面这条命令你肯定不会陌生

# docker pull registry.aliyuncs.com/jiangjizhong/busybox:latest
latest: Pulling from jiangjizhong/busybox
8ddc19f16526: Pull complete
Digest: sha256:a59906e33509d14c036c8678d687bd4eec81ed7c4b8ce907b888c607f6a1e0e6
Status: Downloaded newer image for registry.aliyuncs.com/jiangjizhong/busybox:latest