Docker 6.6 on ubuntu does not activate ports 18091 etc

Installing on ubuntu 20, docker install of couchbase, running with:
./pygluu-compose-linux-amd64.pyz up
docker ps gives:
9f33924a782e couchbase “/ couc…” 11 hours ago Up 11 hours>8091-8096/tcp, :::8091-8096->8091-8096/tcp, 11207/tcp,>11210-11211/tcp, :::11210-11211->11210-11211/tcp, 18091-18096/tcp db

Note that 18091 is there…but that port is not available for secure communications. It doesn’t look like it’s mapping outside the container…
What am I missing?