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Apache Cassandra is a free and open-source NoSQL information base with no single purpose of disappointment. It gives direct adaptability and high accessibility without bargaining execution. Apache Cassandra is utilized by numerous organizations that have enormous, dynamic informational collections, including Reddit, NetFlix, Instagram, and Github. 

This article discloses how to introduce Apache Cassandra on CentOS 8. 

Installing Apache Cassandra

The least demanding approach to introduce Apache Cassandra on CentOS 8 is by introducing the rpm bundle from the official Apache Cassandra storehouse. 

The most recent variant of Apache Cassandra is 3.11 and requires OpenJDK 8 to be introduced on the framework. 

sudo dnf install java-1.8.0-openjdk-devel

When finished, check the establishment by printing the Java variant : 

java -version

The yield should look something like this: 

Output
openjdk version "1.8.0_262"
OpenJDK Runtime Environment (build 1.8.0_262-b10)
OpenJDK 64-Bit Server VM (build 25.262-b10, mixed mode)

Since Java is introduced, the following stage is to include the Apache Cassandra archive. 

Open your word processor and make the accompanying store document: 

sudo nano /etc/yum.repos.d/cassandra.repo

Glue the accompanying substance into the document: 

/etc/yum.repos.d/cassandra.repo
[cassandra]
name=Apache Cassandra
baseurl=https://www.apache.org/dist/cassandra/redhat/311x/
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://www.apache.org/dist/cassandra/KEYS

Spare the document and introduce the most recent form of Apache Cassandra by composing: 

sudo dnf install cassandra

When incited, type y to import the GPG keys. 

When the establishment is finished, start and empower the Cassandra administration: 

sudo systemctl start cassandra
sudo systemctl enable cassandra

Check that Cassandra is running by composing: 

nodetool status

You should see something like this: 

Datacenter: datacenter1
=======================
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
--  Address    Load       Tokens  Owns (effective)  Host ID                               Rack
UN  127.0.0.1  69.99 KiB  256     100.0%            ce0389a3-b48c-4cc9-b594-abe23e677d33  rack1

Configuring Apache Cassandra

Apache Cassandra information is put away in the/var/lib/cassandra registry, design documents are situated in/and so forth/cassandra and Java fire up choices can be arranged in the/and so on/default/cassandra record. 

Naturally, Cassandra is arranged to tune in on localhost as it were. In the event that the customer interfacing with the information base is additionally running on a similar host, you don't have to change the default arrangement record. 

To connect with Cassandra through CQL (the Cassandra Query Language), you can utilize an order line utility named cqlsh that is sent with the Cassandra bundle. 

cqlsh requires Python 2 to be in the framework's PATH . On the off chance that you don't have Python 2 introduced on the worker, you can do it with the accompanying orders: 

sudo dnf install python2
sudo alternatives --set python /usr/bin/python2

When python is set up, run cqlsh to get to the CQL shell: 

cqlsh

Output

[cqlsh 5.0.1 | Cassandra 3.11.7 | CQL spec 3.4.4 | Native protocol v4]
Use HELP for help.
cqlsh> 

Renaming Apache Cassandra Cluster

Of course, the Cassandra bunch is named "Test Cluster". In the event that you need to change the group name, follow the means beneath: 

Login to the Cassandra CQL terminal with cqlsh: 

cqlsh

The accompanying order will change the bunch name to "Linuxize Cluster": 

UPDATE system.local SET cluster_name = 'Linuxize Cluster' WHERE KEY = 'local';

Supplant "Linuxize Cluster" with your ideal name. When done, type exit to leave the reassure. 

Open the cassandra.yaml design record, look for "cluster_name" and enter your new group name: 

sudo nano /etc/cassandra/default.conf/cassandra.yaml

/etc/cassandra/default.conf/cassandra.yaml
cluster_name: 'Linuxize Cluster'

Clear the framework reserve: 

nodetool flush system

At last restart the Cassandra administration: 

sudo systemctl restart cassandra

Conclusion

We've told you the best way to introduce Apache Cassandra on CentOS 8. You would now be able to visit the official Apache Cassandra Documentation page and figure out how to begin with Cassandra. 

In the event that you hit an issue or have criticism, leave a remark underneath.