Install Cassandra on a Single-Node Cluster of Ubuntu 14

#!/bin/bash
# Cassandra, or Apache Cassandra, is a highly scalable open source NoSQL database system,
# achieving great performance on multi-node setups.
# install it to run a single-node cluster on Ubuntu 14.04.
# Prerequisites:
# Ubuntu 14.04 Droplet
# A non-root user with sudo privileges (Initial Server Setup with Ubuntu 14.04 explains how to set this up.)
# Step 1 — Installing the Oracle Java Virtual Machine
# Cassandra requires that the Oracle Java SE Runtime Environment (JRE) be installed.
# So, in this step, you'll install and verify that it's the default JRE.
# make the Oracle JRE package available
sudo add-apt-repository ppa:webupd8team/java
# Update the package database:
sudo apt-get update -y
# install the Oracle JRE. Installing this particular package not only installs it but also makes it the default JRE.
# When prompted, accept the license agreement:
sudo apt-get install oracle-java8-set-default
# verify that it's now the default JRE:
java -version > install-log-cassandra.txt
# Step 2 — Installing Cassandra
# install Cassandra using packages from the official Apache Software Foundation repositories,
# so start by adding the repo so that the packages are available to your system.
echo "deb http://www.apache.org/dist/cassandra/debian 22x main" | sudo tee -a /etc/apt/sources.list.d/cassandra.sources.list
# add the repo's source
echo "deb-src http://www.apache.org/dist/cassandra/debian 22x main" | sudo tee -a /etc/apt/sources.list.d/cassandra.sources.list
# To avoid package signature warnings during package updates, we need to add three public keys from the
# Apache Software Foundation associated with the package repositories.
gpg --keyserver pgp.mit.edu --recv-keys F758CE318D77295D
gpg --export --armor F758CE318D77295D | sudo apt-key add -
gpg --keyserver pgp.mit.edu --recv-keys 2B5C1B00
gpg --export --armor 2B5C1B00 | sudo apt-key add -
gpg --keyserver pgp.mit.edu --recv-keys 0353B12C
gpg --export --armor 0353B12C | sudo apt-key add -
# Update the package database once again:
sudo apt-get update -y
# Finally, install Cassandra:
sudo apt-get install cassandra -y
# Step 3 — Troubleshooting and Starting Cassandra
# Ordinarily, Cassandra should have been started automatically at this point.
# However, because of a bug, it does not. To confirm that it's not running, type:
sudo service cassandra status >> install-log-cassandra.txt
### /etc/init.d/cassandra
### line 60
### CMD_PATT="cassandra.+CassandraDaemon" ==>> CMD_PATT="cassandra"
sudo reboot