Install Apache Solr search platform on CentOS 8

Install Apache Solr search platform on CentOS 8

Apache Solr is an open source search platform written in Java. Apache Solr is built on Apache Lucene. With Solr, you can create a custom search engine to index files, databases, and websites. Solr has a high degree of reliability, scalability and fault tolerance, and will provide many powerful features, such as distributed indexing, replication, load balancing queries, automatic failover and recovery, centralized configuration management and more enterprise functions.

Solr handles many types of data types, such as JSON, XML, many Office document types, CSV, etc.

In this tutorial, we will show you how to install Apache Solr 8.6.3 on CentOS 8.

Claim

A server running CentOS 8. A non-root user with sudo privileges is set up on the server.

Step 1: Install Java

Before we begin, let us update our system by running the following commands.

sudo dnf update

For the latest Apache Solr, we need to install Java 8 or higher.

First, we check whether Java is already installed in the machine by issuing the following command:

which java

If Java is not installed, run the following command:

sudo dnf install java-11-openjdk

After installing Java, we can verify it by running the following command:

java -version
Output:-
openjdk version "11.0.8" 2020-07-14 LTSOpenJDK Runtime Environment 18.9 (build 11.0.8+10-LTS)OpenJDK 64-Bit Server VM 18.9 (build 11.0.8+10-LTS, mixed mode, sharing)

Step 2: Install Apache Solr on CentOS 8

First, we need to download the latest version of Apache Solr from the official Apache website https://downloads.apache.org/lucene/solr/.

We can easily download it using the wget command:

wget https://downloads.apache.org/lucene/solr/8.6.3/solr-8.6.3.tgz

Now, we use the following command to extract the tar file:

tar xzf solr-8.6.3.tgz solr-8.6.3/bin/install_solr_service.sh --strip-components=2

Now, install Solr as a service by running the following command:

sudo bash ./install_solr_service.sh solr-8.6.3.tgz

It will start the installation and we should see the following output:

It will create an account named solr on the system. By default, the Solr port is 8983. We can use the following command to verify:

netstat -tunelp | grep 8983

We should get the following output:

tcp6       0      0 :::8983                 :::*                    LISTEN      974        38261      -

Apache Solr runs as a Systemd service. We can easily start | stop | restart the Solr service with the following command:

systemctl start solrsystemctl stop solrsystemctl restart solr

To check the status of the Apache Solr service, run the following command:

systemctl status solr

Now we enable the solr service by running the following command:

systemctl enable solr

Note:-We need to disable SELinux, edit the following file to disable SELinux permanently

vim /etc/selinux/config

And set as follows

SELINUX = disableds save and exit

Step 3: Firewall

By default, Solr listens on port 8983, so we will need to allow this port through the firewall.

We can do this by running the following command:

sudo firewall-cmd --zone=public --add-port=8983/tcp --permanentsudo firewall-cmd --reload

Step 4: Access Solr Web interface

Now that we have enabled access through the firewall, it is time to access the Solr web interface.

In the web browser, enter the URL http://your-server-ip:8983/solr. We should see the Solr dashboard as follows:

Solr web interface

Step 5: Create your first Solr collection

After successfully installing the Apache Solr service on our system, let us run the following command as root to set the password of the solr user

passwd solr

A collection is a logical index distributed on multiple servers.

Now, we will create the first collection using the following command.

su - solr -c "/opt/solr/bin/solr create -c testconnection -n data_driven_schema_configs"

Output:-

Created new core 'testconnection'

This “testconnection” collection can be found on the dashboard on the left panel of the “Collection”.

Apache Solr documentation collection

in conclusion

In this tutorial, we learn how to install and configure Apache Solr in centos 8. It supports many plugins and many other functions. You can use this tool to take full advantage of the potential of vertical search. For more information, please visit the official Apache Solr website. https://lucene.apache.org/solr/

Sidebar