xvfb-run is being used incorrectly to set DISPLAY

[double16]

The current use of xvfb-run with respect to DISPLAY is:

xvfb-run --server-args="$DISPLAY -screen 0 $GEOMETRY -ac +extension RANDR" \

The applicable documentation for xvfb-run is:

-n NUM    --server-num=NUM          server number to use (default: 99)
-s ARGS   --server-args=ARGS        arguments (other than server number and
                                    "-nolisten tcp") to pass to the Xvfb server
                                    (default: "-screen 0 640x480x8")

Therefore, adding the DISPLAY into --server-args is incorrect. If I create a container and override the DISPLAY environment variable, xvfb won't start.

In my use case I am putting the hub and nodes in the same network, so using the same DISPLAY isn't working. The current containers work because DISPLAY=:99.0 which is the default for xvfb-run.

[double16]

Clarification... xvfb starts but the browser cannot start if DISPLAY is other than :99.0