Difficult to say right now.
The install completes 
I cannot access the web UI 
Trying to debug atm.
Portainer running on the same docker works fine (port 9000), but neither 80 or 443 is responding for discourse.
Errors in logs:
nginx log I am seeing this every second:
2017/07/19 14:22:19 [emerg] 1318#1318: host not found in upstream “avatars.discourse.org” in /etc/nginx/conf.d/discourse.conf:217
In production.log I am seeing the following… seems serious:
Error connecting to Redis on localhost:6379 (Errno::ECONNREFUSED) subscribe failed, reconnecting in 1 second. Call stack [“/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/client.rb:345:in `rescue in establish_connection’”, “/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/client.rb:331:in `establish_connection’”, “/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/client.rb:101:in `block in connect’”, “/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/client.rb:293:in `with_reconnect’”, “/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/client.rb:100:in `connect’”, “/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/client.rb:364:in `ensure_connected’”, “/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/client.rb:221:in `block in process’”, “/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/client.rb:306:in `logging’”, “/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/client.rb:220:in `process’”, “/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/client.rb:134:in `block in call_loop’”, “/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/client.rb:280:in `with_socket_timeout’”, “/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/client.rb:133:in `call_loop’”, “/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/subscribe.rb:43:in `subscription’”, “/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/subscribe.rb:12:in `subscribe’”, “/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis.rb:2765:in `_subscription’”, “/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis.rb:2143:in `block in subscribe’”, “/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis.rb:58:in `block in synchronize’”, “/usr/local/lib/ruby/2.4.0/monitor.rb:214:in `mon_synchronize’”, “/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis.rb:58:in `synchronize’”, “/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis.rb:2142:in `subscribe’”, “/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/message_bus-2.0.2/lib/message_bus/backends/redis.rb:304:in `global_subscribe’”, “/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/message_bus-2.0.2/lib/message_bus.rb:513:in `global_subscribe_thread’”, “/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/message_bus-2.0.2/lib/message_bus.rb:461:in `block in new_subscriber_thread’”]
Job exception: Error connecting to Redis on localhost:6379 (Errno::ECONNREFUSED)
I kept a close eye on installer stdout and didnt see anything fatal looking…
Right now I am doing a lot of googling 
But v grateful for the responsive community - thanks!