How to disable cors (cross origin requests restriction) on the docker remote API

[Erik Anderson]

According to the documentation found here https://coreos.com/docs/distributed-configuration/etcd-configuration/ you should be able to set the API to allow for cross origin requests restriction.  However on the CoreOS base there is no such directory as /etc/etcd/etcd.conf.  Does this need to be created and etcd started with it as an option?  I'm a bit lost here.

[Brandon Philips]

Hello Erik-

This is configuration for etcd but your subject says docker. Are you
asking about docker or etcd?!

By default CORS is disabled for etcd so no further action is required
to disable CORS on etcd.

Thanks,

Brandon

[Erik Anderson]

Hi Brandon,

it was a long night.  What I am doing is sending Docker Remote API rest calls from a container

Request 

http://192.168.1.6:2375/images/json

Response

index.html:28

XMLHttpRequest cannot load http://192.168.1.6:2375/?_=1414391147155. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://127.0.0.1:8080' is therefore not allowed access. index.html:1

From looking at this, it looks like the CoreOS Docker Remote API implementation has -cors turned on.

Erik

[Stephan Z.]

You need to pass `  --api-enable-cors=true` to `docker -d`.

[Rob Szumski]

The process for doing this is very similar to the docs on enabling the debug flag, just swap out the flag:

https://coreos.com/docs/launching-containers/building/customizing-docker/#enabling-the-docker-debug-flag

[Erik Anderson]

Excellent, this is exactly what I needed