...

sudo docker run -d --name opencds opencds/opencds:ubuntu

Run

...

 docker inspect opencds | grep IPAddress command in order to find the URL assigned to the opencds container.  In the following example the URL assigned was 172.17.0.6

sudo docker inspect opencds | grep IPAddress
        "IPAddress": "172.17.0.6",
        "SecondaryIPAddresses": null,

...

SOAP response

Conclusion 

sudo docker inspect opencds | grep IPAddress