How to Install Apache Cassandra on CentOS 7
Apache Cassandra is an open-source NoSQL information base with no single purpose of disappointment, giving direct versatility and high accessibility without bargaining execution. In Cassandra, records are organized likewise as in the social information base with tables, lines, and segments. Apache Cassandra is utilized by various associations including Apple, NetFlix, eBay, and Easou.
This instructional exercise portrays how to introduce Apache Cassandra on CentOS 7.
The client you are signed in as must have sudo advantages to have the option to introduce bundles.
Installing Apache Cassandra
The prescribed method to introduce Apache Cassandra on CentOS 7 is by introducing the rpm bundle from the official Apache Cassandra storehouse.
At the hour of composing this article, the most recent adaptation of Apache Cassandra is 3.11 and requires OpenJDK 8 to be introduced on the framework.
To introduce OpenJDK , on your framework type:
sudo yum install java-1.8.0-openjdk-devel
Confirm the Java establishment by running the accompanying order which will print the Java rendition :
The yield should look something like this:
openjdk version "1.8.0_201" OpenJDK Runtime Environment (build 1.8.0_201-b09) OpenJDK 64-Bit Server VM (build 25.201-b09, mixed mode)
Since Java is introduced, the following stage is to add the Apache Cassandra vault.
Open your editorial manager of decision and make the accompanying store record:
sudo nano /etc/yum.repos.d/cassandra.repo
Glue the accompanying substance into the record:
[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
When the storehouse is empowered, introduce the most recent form of Apache Cassandra by composing:
sudo yum install cassandra
Start and empower the Cassandra administration:
sudo systemctl enable cassandra sudo systemctl start cassandra
Check that Cassandra is running by composing:
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 127.0.0.1 103.68 KiB 256 100.0% 129a9437-377d-415b-b6b2-5dc46b73a763 rack1
Now, Apache Cassandra has been introduced on your CentOS worker.
Configuring Apache Cassandra
Apache Cassandra information is put away in the/var/lib/cassandra index, setup documents are situated in/and so on/cassandra and Java fire up alternatives can be arranged in the/and so forth/default/cassandra record.
Naturally, Cassandra is designed to tune in on localhost as it were. In the event that the customer associating with the information base is additionally running on a similar host you don't have to change the default setup record.
To cooperate with Cassandra through CQL (the Cassandra Query Language) you can utilize an order line utility named cqlsh that is sent with the Cassandra bundle.
Connected to Test Cluster at 127.0.0.1:9042. [cqlsh 5.0.1 | Cassandra 3.11.4 | CQL spec 3.4.4 | Native protocol v4] Use HELP for help. cqlsh>
Renaming Apache Cassandra Cluster
As a matter of course, the Cassandra group is named "Test Cluster". Follow the means underneath in the event that you need to change the bunch name:
Login to the Cassandra CQL terminal with cqlsh:
The accompanying order will change the group name to "Linuxize Cluster":
UPDATE system.local SET cluster_name = 'Linuxize Cluster' WHERE KEY = 'local';
Supplant "Linuxize Cluster" with your ideal name. When done sort exit to leave the comfort.
Alter the cassandra.yaml arrangement document and enter your new bunch name.
cluster_name: 'Linuxize Cluster'
Run the accompanying order to clear the framework reserve:
nodetool flush system
At last restart the Cassandra administration:
sudo systemctl restart cassandra
You have effectively introduced Apache Cassandra on your CentOS 7. 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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