LibreNMS

NOTE: These instructions assume you are the root user. If you are not, prepend sudo to the shell commands

Installation

Install LibreNMS

First install required packages.

apt-get install apache2 composer fping git graphviz imagemagick libapache2-mod-php7.0 mariadb-client mariadb-server mtr-tiny nmap php7.0-cli php7.0-curl php7.0-gd php7.0-json php7.0-mcrypt php7.0-mysql php7.0-snmp php7.0-xml php7.0-zip python-memcache python-mysqldb rrdtool snmp snmpd whois

give <class password> as databse root password.

Add librenms user and user's home directory

useradd librenms -d /opt/librenms -M -r
usermod -a -G librenms www-data

Install LibreNMS

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

Database Configuration

Configure MySQL

systemctl restart mysql
mysql -uroot -p

Create librenms database and librenms database user. grant all privileges to the created user.

CREATE DATABASE librenms CHARACTER SET utf8 COLLATE utf8_unicode_ci;
CREATE USER 'librenms'@'localhost' IDENTIFIED BY '<class password>';
GRANT ALL PRIVILEGES ON librenms.* TO 'librenms'@'localhost';
FLUSH PRIVILEGES;

exit mysql

exit

We need to change some mysql server settings. To do that edit 50-server.cnf file

vi /etc/mysql/mariadb.conf.d/50-server.cnf

Add the following llines within the [mysqld] section

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

Restart the mysql server

systemctl restart mysql

Web server Configuration

Configure PHP

To set the correct time zone edit php.ini

vi /etc/php/7.0/apache2/php.ini

Find the line ;date.timezone and change the line as follows

date.timezone = Asia/Colombo

Do the same to the vi /etc/php/7.0/cli/php.ini

Enable php modules in apache

a2enmod php7.0
a2dismod mpm_event
a2enmod mpm_prefork
phpenmod mcrypt

Configure Apache

Create librenms.conf to enable the site

vi /etc/apache2/sites-available/librenms.conf

Add the following lines:

<VirtualHost *:80>
  DocumentRoot /opt/librenms/html/
  CustomLog /opt/librenms/logs/access_log combined
  ErrorLog /opt/librenms/logs/error_log
  AllowEncodedSlashes NoDecode
  <Directory "/opt/librenms/html/">
    Require all granted
    AllowOverride All
    Options FollowSymLinks MultiViews
  </Directory>
</VirtualHost>

Enable the librenms site and restart apache server

a2ensite librenms.conf
a2enmod rewrite
systemctl restart apache2

Configure snmpd

Create the snmpd configuration file

cp /opt/librenms/snmpd.conf.example /etc/snmp/snmpd.conf
vi /etc/snmp/snmpd.conf

Edit the text which says RANDOMSTRINGGOESHERE and set your own community string.

Install the libreNMS agent and restart snmpd

curl -o /usr/bin/distro https://raw.githubusercontent.com/librenms/librenms-agent/master/snmp/distro
chmod +x /usr/bin/distro
systemctl restart snmpd

Cron job

cp /opt/librenms/librenms.nonroot.cron /etc/cron.d/librenms

Copy logrotate config

LibreNMS keeps logs in /opt/librenms/logs. Over time these can become large and be rotated out. To rotate out the old logs you can use the provided logrotate config file:

cp /opt/librenms/misc/librenms.logrotate /etc/logrotate.d/librenms

Set permissions

chown -R librenms:librenms /opt/librenms
setfacl -d -m g::rwx /opt/librenms/rrd /opt/librenms/logs
setfacl -R -m g::rwx /opt/librenms/rrd /opt/librenms/logs

Web Installer

OPen a browser in your host machine and open a browser. enter the following url