How to Install Apache Cassandra on CentOS 8
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 :
The yield should look something like this:
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:
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:
You should see something like this:
-- 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 5.0.1 | Cassandra 3.11.7 | CQL spec 3.4.4 | Native protocol v4]
Use HELP for help.
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:
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
cluster_name: 'Linuxize Cluster'
Clear the framework reserve:
nodetool flush system
At last restart the Cassandra administration:
sudo systemctl restart cassandra
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.
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