{"id":6449,"date":"2021-05-25T17:56:37","date_gmt":"2021-05-25T17:56:37","guid":{"rendered":"https:\/\/linuxways.net\/?p=6449"},"modified":"2021-05-25T17:56:37","modified_gmt":"2021-05-25T17:56:37","slug":"how-to-install-apache-cassandra-on-ubuntu-20-04","status":"publish","type":"post","link":"https:\/\/linuxways.net\/de\/ubuntu\/how-to-install-apache-cassandra-on-ubuntu-20-04\/","title":{"rendered":"How to Install Apache Cassandra on Ubuntu 20.04"},"content":{"rendered":"

Apache Cassandra is an open-source non-relational database that delivers high performance, linear scalability, and continuous availability. All these features make Cassandra an ideal platform for mission-critical data. In today\u2019s post, we will be describing how to install Apache Cassandra on Ubuntu OS.<\/p>\n

Note<\/strong>: The procedure shown here has been tested on Ubuntu 20.04 LTS (Focal Fossa).<\/strong><\/p>\n

Step 1: Install java<\/h2>\n

Apache Cassandra requires java to be running on the machine. Use these commands to install java on your system:<\/p>\n

$ sudo apt update<\/pre>\n
$ sudo apt install openjdk-8-jdk<\/pre>\n
To verify if Java is installed, issue this command in Terminal:<\/p>\n
$ java -version<\/pre>\n
<\/h2>\n
Step 2: Install Apache Cassandra<\/h2>\n
Before proceeding towards the installation of Apache Cassandra, you will first need to install the apt-transport-https<\/strong> package. You can install it using this command:<\/p>\n
$ sudo apt install apt-transport-https<\/pre>\n
Enter the password for sudo. When prompted for continuation, press y<\/strong>.<\/p>\n
<\/p>\n
Now import and add the GPG key using this command in the Terminal:<\/p>\n
$ wget -q -O - https:\/\/www.apache.org\/dist\/cassandra\/KEYS | sudo apt-key add -<\/pre>\n
If the key is added successfully, you will see OK<\/strong> in the output.<\/p>\n
<\/p>\n
Now add the Apache Cassandra repository to apt list of sources using this command in the Terminal:<\/p>\n
$ sudo sh -c 'echo \"deb http:\/\/www.apache.org\/dist\/cassandra\/debian 311x main\" > \/etc\/apt\/sources.list.d\/cassandra.list'<\/pre>\n
<\/p>\n
Update the apt list of sources using the command below in the Terminal:<\/p>\n
$ sudo apt update<\/pre>\n
Now that the repository has been added, you can install Apache Cassandra using this command in the Terminal:<\/p>\n
$ sudo apt install Cassandra<\/pre>\n
Enter the password for sudo. When prompted for continuation, press y<\/strong>.<\/p>\n
<\/p>\n
After the installation of Apache Cassandra, its service starts automatically. To verify it, use the command below:<\/p>\n
$ sudo systemctl status Cassandra<\/pre>\n
Also, you can verify the status using the below command:<\/p>\n
$ sudo nodetool status<\/pre>\n
You\u2019ll see something similar to the following:<\/p>\n
<\/p>\n
Now the Apache Cassandra has been successfully installed. To login to Apache Cassandra, you can use the cqlsh<\/strong> command-line tool as follows:<\/p>\n
$ cqlsh<\/pre>\n
You will see something similar to the following:<\/p>\n
<\/p>\n
Rename Apache Cassandra Cluster<\/h2>\n
In the previous output, you can see the cluster name is “Test Cluster”. To change the default cluster name, log in to Cassandra using the cqlsh command-line tool as follows:<\/p>\n
$ cqlsh<\/pre>\n
Then issue the command below in the Terminal to rename the Apache Cassandra Cluster to let\u2019s say \u201cLinuxways_cluster\u201d:<\/p>\n
$ UPDATE system.local SET cluster_name = \u2018Linuxways_cluster' WHERE KEY = 'local';<\/pre>\n
Make sure to change the Linuxways_cluster<\/strong> with your own desired name.<\/p>\n
Now to exit the cqlsh tool, type exit<\/em>, and press Enter<\/strong>:<\/p>\n
$ exit<\/pre>\n
<\/p>\n
Then edit the cassandra.yaml configuration file using the command below in the Terminal:<\/p>\n
$ sudo nano \/etc\/cassandra\/cassandra.yaml<\/pre>\n
Now in the cassandra.yaml configuration file, search for the cluster_name.<\/p>\n
<\/p>\n
Once you find it, change its name to your desired value. Then save and exit the file. <\/p>\n
Now to verify if the cluster name has been changed successfully, use the command below:<\/p>\n
$ cqlsh<\/pre>\n
The output below verifies that the cluster name has been changed successfully to Linuxways_cluster<\/strong>.<\/p>\n
<\/p>\n
Uninstall Apache Cassandra<\/h2>\n
In case you need to remove Apache Cassandra from your machine, you can do this using the following steps:<\/p>\n
Stop the service of Cassandra using the command below:<\/p>\n
$ sudo service cassandra stop<\/pre>\n
Then remove the library and log directories using these commands:<\/p>\n
$ sudo rm -r \/var\/lib\/cassandra<\/pre>\n
$ sudo rm -r \/var\/log\/Cassandra<\/pre>\n
After that, uninstall Apache Cassandra using the command below:<\/p>\n
$ sudo apt purge cassandra<\/pre>\n
This was all about installing Apache Cassandra on Ubuntu 20.04 LTS. To learn more about Apache Cassandra, visit its official documentation<\/a> site.<\/p>","protected":false},"excerpt":{"rendered":"
Apache Cassandra is an open-source non-relational database that delivers high performance, linear scalability, and continuous availability. All these features make Cassandra an ideal platform for mission-critical data. In…<\/p>","protected":false},"author":1,"featured_media":6538,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[333],"class_list":["post-6449","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ubuntu","tag-apache-cassandra"],"_links":{"self":[{"href":"https:\/\/linuxways.net\/de\/wp-json\/wp\/v2\/posts\/6449","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/linuxways.net\/de\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/linuxways.net\/de\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/linuxways.net\/de\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/linuxways.net\/de\/wp-json\/wp\/v2\/comments?post=6449"}],"version-history":[{"count":0,"href":"https:\/\/linuxways.net\/de\/wp-json\/wp\/v2\/posts\/6449\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/linuxways.net\/de\/wp-json\/wp\/v2\/media\/6538"}],"wp:attachment":[{"href":"https:\/\/linuxways.net\/de\/wp-json\/wp\/v2\/media?parent=6449"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/linuxways.net\/de\/wp-json\/wp\/v2\/categories?post=6449"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/linuxways.net\/de\/wp-json\/wp\/v2\/tags?post=6449"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}