如何为Windows配置Docker以使用主机文件推送到存储库

Question

I'm trying to push a container from my local dev box to a remote private repository whose hostname is set in my Windows host file. When I push I get this:

docker push docker:5000/m2
The push refers to a repository [docker:5000/m2]
Put http://docker:5000/v1/repositories/m2/: dial tcp: lookup docker on 192.168.65.1:53: no such host

If I do a curl -vvv on the URL using babun I get this:

curl -vvv http://docker:5000/v1/repositories/m2/
* STATE: INIT => CONNECT handle 0x20048188; line 1034 (connection #-5000)
* Added connection 0. The cache now contains 1 members
*   Trying 192.168.1.8...
* STATE: CONNECT => WAITCONNECT handle 0x20048188; line 1087 (connection #0)
* Connected to docker (192.168.1.8) port 5000 (#0)
* STATE: WAITCONNECT => DO handle 0x20048188; line 1229 (connection #0)
> GET /v1/repositories/m2/ HTTP/1.1
> User-Agent: Mozilla/5.0 (Windows; U; MSIE 9.0; WIndows NT 9.0; en-US))
> Host: docker:5000
> Accept: */*
>
* STATE: DO => DO_DONE handle 0x20048188; line 1314 (connection #0)
* STATE: DO_DONE => WAITPERFORM handle 0x20048188; line 1441 (connection #0)
* STATE: WAITPERFORM => PERFORM handle 0x20048188; line 1454 (connection #0)
* Increasing bytecount by 7 from hbuflen

* nread <= 0, server closed connection, bailing
* STATE: PERFORM => DONE handle 0x20048188; line 1626 (connection #0)
* Connection #0 to host docker left intact
* Expire cleared

Since I'm getting the error message locally, but not when I use curl, and given the error message, it seems like my local Windows docker instance is not resolving to the docker hostname.

Answer 1

Docker does the push on the remote docker daemon, not the local docker client, which means the DNS resolution needs to work on that system. This also includes any proxy settings. There was also a recent bug that at least affected Docker for Mac, possibly also Windows too, where it was not using the local DNS server. I believe that's been fixed in 1.13.1, but I already worked around that by adding the entries I needed into the /etc/hosts file (I believe windows still puts this under system32\\drivers\\etc).

Note that after you change DNS settings on the Windows host to get name resolution working, you'll likely need to restart the docker daemon to get the embedded VM to restart with these changes.