Install Apache Cassandra on Ubuntu 16.04

This adds repo for the stable release of 3.11.x.

$ echo "deb http://www.apache.org/dist/cassandra/debian 311x main" | sudo tee -a /etc/apt/sources.list.d/cassandra.sources.list

Add the repository keys.

$ curl https://www.apache.org/dist/cassandra/KEYS | sudo apt-key add -
$ sudo apt-key adv --keyserver pool.sks-keyservers.net --recv-key A278B781FE4B2BDA

Default configuration values

Configuration file: /etc/cassandra/cassandra.yaml

cluster_name: 'Test Cluster'
...
        - seeds: "127.0.0.1"
...
storage_port: 7000
listen_address: localhost
# or listen_interface: eth0
native_transport_port: 9042