How To Install LibreNMS on CentOS 7

Install LibreNMS on CentOS 7

In this tutorial, we will show you how to install LibreNMS on CentOS 7 server. For those of you who didn’t know, For those of you who didn’t know, LibreNMS is an open-source auto-discovering network monitoring tool for servers and network hardware. It supports a wide range of network hardware like Cisco, Juniper, Brocade, Foundry, HP, and operating systems including Linux and Windows. LibraNMS is a community-based fork of Network monitoring tool “Observium“, released under GPLv3.

This article assumes you have at least basic knowledge of Linux, know how to use the shell, and most importantly, you host your site on your own VPS. The installation is quite simple and assumes you are running in the root account, if not you may need to add ‘sudo’ to the commands to get root privileges. I will show you through the step by step installation of the LibreNMS network monitoring tool on a CentOS 7 server.

LibreNMS Features

  • Automatic discovery
  • Customizable alerting
  • API Access
  • Billing system
  • Automatic Updates
  • Distributed Polling
  • iOS and Android App
  • Unix Agent
  • And many more

Install LibreNMS on CentOS 7

Step 1. First, let’s start by ensuring your system is up-to-date.

yum clean all
yum -y update

Step 2. Install LAMP server.

A CentOS 7 LAMP stack server is required. If you do not have LAMP installed, you can follow our guide here. Also, install the required PHP modules:

yum -y install php-gd php-imap php-ldap php-odbc php-pear php-xml php-xmlrpc php-mbstring php-mcrypt php-mssql php-snmp php-soap php-tidy curl curl-devel ImageMagick jwhois nmap mtr rrdtool net-snmp-utils vixie-cron php-mcrypt fping git
pear install Net_IPv4-1.3.4
pear install Net_IPv6-1.2.2b2

Step 3. Installing LibreNMS.

First, Add LibreNMS user:

useradd librenms -d /opt/librenms -M -r
usermod -a -G librenms apache

Next, clone LibreNMS repo on /opt directory:

cd /opt/
git clone https://github.com/librenms/librenms.git librenms

Set the correct permission to the LibreNMS directory:

chown -R librenms:librenms /opt/librenms

Step 4. Configuring MariaDB for LibreNMS.

By default, MariaDB is not hardened. You can secure MariaDB using the mysql_secure_installation script. you should read and below each step carefully which will set a root password, remove anonymous users, disallow remote root login, and remove the test database and access to secure MariaDB:

mysql_secure_installation

Configure it like this:

- Set root password? [Y/n] y
- Remove anonymous users? [Y/n] y
- Disallow root login remotely? [Y/n] y
- Remove test database and access to it? [Y/n] y
- Reload privilege tables now? [Y/n] y

Next, we will need to log in to the MariaDB console and create a database for the LibreNMS. Run the following command:

mysql -u root -p

This will prompt you for a password, so enter your MariaDB root password and hit Enter. Once you are logged in to your database server you need to create a database for LibreNMS installation:

MariaDB [(none)]> CREATE DATABASE librenms CHARACTER SET utf8 COLLATE utf8_unicode_ci;
MariaDB [(none)]> CREATE USER 'librenms'@'localhost' IDENTIFIED BY 'PASSWORD';
MariaDB [(none)]> GRANT ALL PRIVILEGES ON librenms.* TO 'librenms'@'localhost';
MariaDB [(none)]> FLUSH PRIVILEGES;
MariaDB [(none)]> exit

Next, open the MariaDB configuration file and add the following lines under [mysqld] section:

### nano /etc/mysql/mariadb.conf.d/50-server.cnf

innodb_file_per_table=1
sql-mode=""
lower_case_table_names=0

Restart MariaDB for the changes to take effect:

systemctl restart mariadb

Step 5. Configure Apache web server for LibreNMS.

We will create an Apache virtual host for your LibreNMS website. First, create ‘/etc/httpd/conf.d/vhosts.conf’ file with using a text editor of your choice:

nano /etc/httpd/conf.d/vhosts.conf
IncludeOptional vhosts.d/*.conf

Next, create the virtual host:

mkdir /etc/httpd/vhosts.d/
nano /etc/httpd/vhosts.d/yourdomain.com.conf

Add the following lines:

<VirtualHost YOUR_SERVER_IP:80>
ServerAdmin webmaster@yourdomain.com
DocumentRoot /opt/librenms/html/
ServerName yourdomain.com
ServerAlias www.yourdomain.com
ErrorLog "/var/log/httpd/yourdomain.com-error_log"
CustomLog "/var/log/httpd/yourdomain.com-access_log" combined

<Directory "/opt/librenms/html/">
DirectoryIndex index.html index.php
Options FollowSymLinks
AllowOverride All
Require all granted
</Directory>
</VirtualHost>

Save and close the file. Restart the apache service for the changes to take effects:

systemctl restart httpd.service

Step 6. Configure Firewall.

Allow apache through the firewall so that user can able to access LibreNMS portal from an external machine:

firewall-cmd --permanent --add-port=80/tcp
firewall-cmd --reload

Step 7. Accessing LibreNMS.

LibreNMS will be available on HTTP port 80 by default. Open your favorite browser and navigate to http://yourdomain.com/ or http://server-ip/ and complete the required steps to finish the installation. If you are using a firewall, please open port 80 to enable access to the control panel.

Congratulations! You have successfully installed LibreNMS. Thanks for using this tutorial for installing LibreNMS network monitoring tool on CentOS 7 systems. For additional help or useful information, we recommend you to check the official LibreNMS website.

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