If you are deploying Membase behind a 2nd firewall, what ports should you open? Of note, Membase should always be deployed behind at least one firewall, where clients connections are allowed only from trusted web application servers. If, however, you have deployed Membase on an inner network behind a 2nd level firewall...
The ports Membase uses include: 11211, 11210, 4369, 8091 and the port range from 21100 to 21199.
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The server-side Moxi port is 11211. Pre-existing Membase and Memcached (non-smart) client libraries that are outside the 2nd level firewall would just need port 11211 open to work.
If you want to use the web admin console from outside the 2nd level firewall, also open up port 8091 (for REST/HTTP traffic).
If you're using smart clients or client-side Moxi from outside the 2nd level firewall, also open up port 11210 (in addition to the above port 8091), so that the smart client libraries or client-side Moxi can directly connect to the data nodes.
Server-side Membase nodes (aka, nodes joined into a Membase cluster) need all the above ports open to work: 11211, 11210, 4369 (erlang), 8091, and the port range from 21100 to 21199 (erlang).