asadmin create-domain does not seem to have any way to set the JMX_ADMIN port.
All the ways I've tried either endup in errors or with it printing:
Using default port 8,686 for JMX_ADMIN.
asadmin help create-domain talks about a --admin.jmxport option, but using that option always
results in the error:
CLI019 Invalid number of operands. Number of operands should be equal to 1.
There does not seem to be a value that you can set for --domainproperties, and if there is one, it's not
documented in "asadmin help create-domain"
Here's a note about this from Kedar Mhaswade to Jane Young about it:
There is no option like --admin.jmxport. The correct option way is: --domainproperties
The create-domain help is broken as you correctly identified. But there is already a bug that I filed on
this: 6207363, which we will fix for 9.0.
I think we fixed this for 8.1 UR1/UR2, but apparently it is not ported to 9.0 codebase.