Dockerfile Overriding ENV variable
What you have described should work just fine. Given:
$ cat DockerfileFROM socialengine/nginx-spaENV API_URL localhost:6007$ docker build -t ui .[...]
Consider this:
$ docker run -it --rm ui env | grep API_URLAPI_URL=localhost:6007
Compared to:
$ docker run -it --rm -e API_URL='production:6007' ui env | grep API_URLAPI_URL=production:6007
Passing a -e VARNAME=varvalue
on the docker run
command line will override a default set in your Dockerfile.
If you are seeing different behavior, please update your question to show exactly the command you are running and the associated output.
Update
Here is the complete example, recorded for your viewing pleasure: