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How to Install Apache Cassandra 3.11.x on Ubuntu 16.04 LTS

How to Install Apache Cassandra 3.11.x on Ubuntu 16.04 LTS

Apache Cassandra is a free and open source NoSQL database management system that is designed to provide scalability, high availability, and uncompromised performance.
In this article will guide you through installing the latest stable release of Apache Cassandra, Apache Cassandra 3.11.2, on a Ubuntu 16.04 LTS server instance.

Step 1: Install OpenJDK JRE 8

Apache Cassandra requires the latest release of Java 8. For that you can choose to install the latest release of OpenJDK JRE 1.8 as below:
sudo apt install openjdk-8-jre -y
Having OpenJDK JRE 1.8 installed, you can confirm the installation result:
java -version
The output will be similar to the following:
openjdk version "1.8.0_151"
OpenJDK Runtime Environment (build 1.8.0_151-8u151-b12-0ubuntu0.16.04.2-b12)
OpenJDK 64-Bit Server VM (build 25.151-b12, mixed mode)
Optionally, you can create the JAVA_HOME environment variable as follows:
echo "JAVA_HOME=$(readlink -f /usr/bin/java | sed "s:bin/java::")" | sudo tee -a /etc/profile
source /etc/profile
echo $JAVA_HOME

Step 2: Install Python 2.7, if it's missing on your system

Apache Cassandra requires Python 2.7 rather than Python 3. If you operate Apache Cassandra in a Python 3 environment, you may have trouble launching the cqlsh shell of Apache Cassandra.
First, determine the existence and version of Python on your machine:
python -V
On Ubuntu 16.04 LTS, the output can be slightly confusing:
The program 'python' can be found in the following packages:
* python-minimal
* python3
Ask your administrator to install one of them
That actually means you need to install Python 2.7 by yourself:
sudo apt install python -y
Re-run the python -V command, and the output will become:
Python 2.7.12

Step 3: Install the latest stable release of Apache Cassandra

Create the Apache Cassandra 3.11.x apt repo:
echo "deb http://www.apache.org/dist/cassandra/debian 311x main" | sudo tee -a /etc/apt/sources.list.d/cassandra.sources.list
curl https://www.apache.org/dist/cassandra/KEYS | sudo apt-key add -
sudo apt-get update
If you encounter a GPG public key error, run the following commands to add the mentioned Apache Cassandra public key, which is A278B781FE4B2BDA in this case:
sudo apt-key adv --keyserver pool.sks-keyservers.net --recv-key A278B781FE4B2BDA
sudo apt-get update
Use the newly added apt repo to install Apache Cassandra:
sudo apt-get install cassandra

Step 4: Test the installation of Apache Cassandra

Start the Apache Cassandra daemon:
sudo service cassandra start
If you want to make Apache Cassandra automatically start at system boot, run the following command:
sudo update-rc.d cassandra defaults
Next, use the nodetool program to show the status of Apache Cassandra on current node:
nodetool status
The output will resemble the following:
Datacenter: datacenter1
=======================
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
--  Address    Load       Tokens       Owns (effective)  Host ID                               Rack
UN  127.0.0.1  102.66 KiB  256          100.0%            23916cfd-892d-4898-857c-aff9efe2354a  rack1
You can use the cqlsh shell to interact with Apache Cassandra:
cqlsh localhost
The output will be similar to the following:
Connected to Test Cluster at localhost:9042.
[cqlsh 5.0.1 | Cassandra 3.11.2 | CQL spec 3.4.4 | Native protocol v4]
Use HELP for help.
cqlsh>
For now, just type exit and then press ENTER to quit the cqlsh shell.
If you want to stop Apache Cassandra, execute the following command:
sudo service cassandra stop

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