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应该是tag不对吧,不加tag默认使用latest的tag,而你的这个仓库好像并没有
docker pull registry.aliyuncs.com/dan/ubuntu_jdk8:v1
v1: Pulling from dan/ubuntu_jdk8
5a132a7e7af1: Pull complete
fd2731e4c50c: Pull complete
28a2f68d1120: Pull complete
a3ed95caeb02: Pull complete
48d7c390f26b: Pull complete
93dd305d53e6: Pull complete
71ac7edebcda: Pull complete
911042ca57a5: Pull complete
06b3783c783f: Pull complete
75534730e2a6: Pull complete
e030c7e43ca4: Pull complete
3669909a636b: Pull complete
Digest: sha256:eb768826f578a844b5b6248b97238b62ad3436a7a2e84d614c3c909911588ec0
Status: Downloaded newer image for registry.aliyuncs.com/dan/ubuntu_jdk8:v1