How to Install Apache Solr 5.1 on CentOS 6

How to Install Apache Solr 5.1 on CentOS 6 :-

following are the steps for how to install Apache Solr 5.1 on a CentOS 6 server . 

Step 1. Install Solr :-

download and install solr first.

# cd /opt/solr 

# wget http://mirror.symnds.com/software/Apache/lucene/solr/5.1.0/solr-5.1.0.tgz -O solr-5.1.0.tgz

Uncompress the file:

# tar -xzvf ./solr-5.1.0.tgz

Now the directory /opt/solr/solr-5.1.0 will contain all the Solr files. 

Step 2. Install Java :-

First, check if Java is already installed:

# which java

  If not installed, install the latest version :

# yum list available java* 

# yum install java-1.8.0-openjdk.x86_64

Verify install:

# which java 

[...] 

# java -version 

openjdk version "1.8.0_45" 

OpenJDK Runtime Environment (build 1.8.0_45-b13) 

OpenJDK 64-Bit Server VM (build 25.45-b02, mixed mode)

Step 3. Start Solr :-

Next start Solr and test instance:

# cd /opt/solr/solr-5.1.0 

# bin/solr start -noprompt

Verify Solr is running:

# ps aux | grep solr 

[...] 

# lsof -i :8983 

[...]

Step 4. Install NMAP :-

The Solr service can also be verified from a remote machine. First, install nmap if not already installed on remote machine:

# yum install nmap

Then test the Solr service from the remote machine:

# nmap -p 8983 [remote IP address] 

Starting Nmap 5.51 ( http://nmap.org ) at * EDT 

Nmap scan report for 

Host is up (0.054s latency). 

PORT STATE SERVICE 

8983/tcp open unknown 

Nmap done: 1 IP address (1 host up) scanned in 0.25 seconds

If the remote machine is unable to connect try setting up firewall rules, or disable firewall for testing:

# service iptables stop

Stopping Solr can be accomplished using:

# cd /opt/solr/solr-5.1.0 

# bin/solr stop

Step 5. Auto Start Solr :-

Finally, Solr can be setup as a service that starts when the server boots. Create the script file 

/etc/init.d/solr and add:

#!/bin/sh 

# chkconfig: 2345 95 20 

# description: Solr Server 

# Solr Server service start, stop, restart 

# @author Shay Anderson 04.15 

SOLR_DIR="/opt/solr/solr-5.1.0" 

case $1 in 

      start) 

            echo "Starting Solr..." 

            $SOLR_DIR/bin/solr start -noprompt 

            sleep 1 

            lsof -i :8983 

            ;; 

      stop) 

            echo "Stopping Solr..." 

            $SOLR_DIR/bin/solr stop 

            ;; 

      restart) 

            $0 stop 

            sleep 2 

            $0 start 

            ;; 

      status) 

            $SOLR_DIR/bin/solr status 

            ;; 

      *) 

            echo "Usage: $0 [start|stop|restart]" 

            exit 1 

            ;; 

esac 

exit 0

Save the file and set permissions:

# chmod +x /etc/init.d/solr

Now the Solr service can be started/stopped using:

# service solr start 

[...] 

# service solr stop 

[...]

Enable auto start service on server boot:

# cd /etc/init.d 

# chkconfig --add solr 

# chkconfig | grep solr

Now the Solr service will start on server boot. 

Create New Core

A new core can be created using:

# cd /opt/solr/solr-5.1.0 

# bin/solr create -c mycore

This will create the core and core directory /opt/solr/solr-5.1.0/server/solr/mycore