问题
I'm running Docker on OS X under boot2docker 1.3.1
I built myself an image, oceania/python:
$ docker images
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
oceania/python 0.1 800229a896ff 16 hours ago 510.4 MB
I have another Dockerfile now where I want to use FROM oceania/python
When I try to build this image I get:
Sending build context to Docker daemon 31.74 MB
Sending build context to Docker daemon
Step 0 : FROM oceania/python
Pulling repository oceania/python
2014/11/20 17:23:51 Error: image oceania/python not found
Shouldn't it look at my local images first before going online to try and pull it?
Am I really obliged to upload it to a repository?
@jpetazzo answers here that what I am doing should work:
https://stackoverflow.com/a/20501690/202168
I assume the problem may therefore be boot2docker related
回答1:
Uhhh, ok...
It seems I have to include the tag, i.e.
FROM oceania/python:0.1
...then it works.
The docs appear to allow a FROM directive without the tag, and they say: "If no tag is given to the FROM instruction, latest is assumed."
I guess the underlying problem is that if your image is not uploaded to an index somewhere then it can't resolve 'latest' to a tag.
Another thing that's confusing is it seems in other people's answers and comments on similar issue, eg automated docker build run error: Unable to find image they get some output that looks like:
Unable to find image 'foo/bar:baz' locally
but in my output there's nothing to say docker even tried to look locally
来源：https://stackoverflow.com/questions/27046118/docker-under-boot2docker-does-not-look-for-find-local-images-when-building