I had a clouddb 1.6 virtual machine in the Google cloud, which I tried to replace with a 2.0 machine yesterday.
I noticed some differences in how the couchdb is configured when the application is created.
I'm don't know if this is on purpose or oversight.
At first, I couldn't access the couchdb server, which was because the ip configuration of the http listener was set to 127.0.0.1
Changing this to 0.0.0.0 resolved the problem.
Also the admin account is not initialized on the database.