Expose further settings in Cassandra

[sunnychanwork]

We would like to expose further settings in Cassandra which we find useful in production

storage_port
ssl_storage_port
native_transport_port
rpc_port
read_request_timeout_in_ms
request_timeout_in_ms
range_request_timeout_in_ms
write_request_timeout_in_ms
counter_write_request_timeout_in_ms

[tianon]

I'm sorry, but honestly if we're going to do anything more with environment variables it would likely be in the opposite direction (which we won't do due to the backwards compatibility implications) -- modifying a YAML file via shell script is very fragile, and setting complex configuration in this way is not great. For custom configuration, the only/best recommendation is to provide an appropriate cassandra.yaml file to your running instance (via a new image with FROM / COPY in a short Dockerfile, via Docker Configs, via bind mount, etc).

Closing in favor of #160 + docker-library/docs#1317.

[HadesArchitect]

@yosifkit It's pretty sad it went the way that decreases the flexibility and usability of the docker image. We always can use cassandra.yaml file but in many cases ability to configure it via env vars is way much better. =/