How to Install Apache Cassandra on CentOS 8
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Apache Cassandra is a free and open-source NoSQL database with no single point of failure. It provides linear scalability and high availability without compromising performance. Apache Cassandra is used by many companies that have large, active data sets, including Reddit, NetFlix, Instagram, and Github.
This article explains how to install Apache Cassandra on CentOS 8.
Installing Apache Cassandra
The easiest way to install Apache Cassandra on CentOS 8 is by installing the rpm package from the official Apache Cassandra repository.
The latest version of Apache Cassandra is
3.11 and requires OpenJDK 8 to be installed on the system.
Run the following command as root or user with sudo privileges to install OpenJDK :
sudo dnf install java-1.8.0-openjdk-devel
Once completed, verify the installation by printing the Java version :
The output 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)
Now that Java is installed, the next step is to add the Apache Cassandra repository.
Open your text editor and create the following repository file:
sudo nano /etc/yum.repos.d/cassandra.repo
Paste the following content into the file:
[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
Save the file and install the latest version of Apache Cassandra by typing:
sudo dnf install cassandra
When prompted, type
y to import the GPG keys.
Once the installation is completed, start and enable the Cassandra service:
sudo systemctl start cassandra
sudo systemctl enable cassandra
Verify that Cassandra is running by typing:
You should see something similar to 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
That’s it. At this point, you have Apache Cassandra installed on your CentOS server.
Configuring Apache Cassandra
Apache Cassandra data is stored in the
/var/lib/cassandra directory, configuration files are located in
/etc/cassandra and Java start-up options can be configured in the
By default, Cassandra is configured to listen on localhost only. If the client connecting to the database is also running on the same host, you don’t need to change the default configuration file.
To interact with Cassandra through CQL (the Cassandra Query Language), you can use a command line utility named
cqlsh that is shipped with the Cassandra package.
cqlsh requires Python 2 to be in the system’s PATH
. If you don’t have Python 2 installed
on the server, you can do it with the following commands:
sudo dnf install python2
sudo alternatives --set python /usr/bin/python2
Once python is set up, run
cqlsh to access the CQL shell:
[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
By default, the Cassandra cluster is named “Test Cluster”. If you want to change the cluster name, follow the steps below:
Login to the Cassandra CQL terminal with
The following command will change the cluster name to “Linuxize Cluster”:
UPDATE system.local SET cluster_name = 'Linuxize Cluster' WHERE KEY = 'local';
Replace “Linuxize Cluster” with your desired name. Once done, type
exitto exit the console.
cassandra.yamlconfiguration file, search for “cluster_name” and enter your new cluster name:
sudo nano /etc/cassandra/default.conf/cassandra.yaml/etc/cassandra/default.conf/cassandra.yaml
cluster_name: 'Linuxize Cluster'
Clear the system cache:
nodetool flush system
Finally restart the Cassandra service:
sudo systemctl restart cassandra
We’ve shown you how to install Apache Cassandra on CentOS 8. You can now visit the official Apache Cassandra Documentation page and learn how to get started with Cassandra.
If you hit a problem or have feedback, leave a comment below.