Posted 28 November, 2015
This is a simple manual to install LibreNMS, a network monitoring system, on a clean Centos 7.1 . I’m a huge fan of this so I think its important to expand information on this. Recently I have have tried to update the docs of Centos/RHEL, I’m not sure if they will be accepted as I’m rather new to this project and while I want to give back, I’m not that good with giving neutral documentation 🙂 Below I wrote a quick start, some options I left out, just cause you wane be monitoring rather sooner then later. For more support you could always look in the LibreNMS docs.
# installation epel repo yum install epel-release # install dependencies yum install php php-cli php-gd php-mysql php-snmp php-pear php-curl httpd net-snmp graphviz graphviz-php mariadb jwhois nmap mtr rrdtool MySQL-python net-snmp-utils php-mcrypt fping git mariadb-server # some extra stuff pear install Net_IPv4-1.3.4 pear install Net_IPv6-1.2.2b2
After installing the packages needed for LibreNMS Its time to setup the database.
# set to start at boot chkconfig mariadb on # start the service service mariadb start # configure MariaDB mysql_secure_installation # go into mysal console mysql -u root -p # in the console : # create database CREATE DATABASE librenms; # give permissions to a new user librenms # note : CHANGE THE PASSWORD GRANT ALL PRIVILEGES ON librenms.* TO 'librenms'@'localhost' IDENTIFIED BY 'password' ; # flush the permission FLUSH PRIVILEGES;
Installing the software is actually just cloning the master git repo and keeping it up to date, this is done with a cron.
# move to /opt directory cd /opt # clone the source git clone https://github.com/librenms/librenms.git librenms # move to work directory cd /opt/librenms # copy the original configuration to work config cp config.php.default config.php # fill in the config.php # most important are the database (db_*), community # also add : $config['fping'] = "/usr/sbin/fping"; # don't ask me why its not there to begin with ... nano config.php # while we are in the right directory lets create some needed # directories and execute some SQL data php build-base.php # add a new user # change name, pass and email php adduser.php name pass 10 email # add new user # and add it to the apache group useradd librenms -d /opt/librenms -M -r usermod -a -G librenms apache # create directories mkdir /opt/librenms/rrd mkdir /opt/librenms/logs # chmod them chmod 775 /opt/librenms/rrd # change owner chown -R librenms:librenms /opt/librenms chown apache:apache /opt/librenms/logs
After that I suggest we create the cron, good thing its already in the git.
# copy it from source to cron cp /opt/librenms/librenms.nonroot.cron /etc/cron.d # make it readable chmod 0644 /etc/cron.d/librenms.nonroot.cron # I set the ownership to root # though the execution of the crons will not be root, # hence the name nonroot (which is recommended) chown root.root /etc/cron.d/librenms.nonroot.cron
After that we are ready to setup the webinterface, here I use httpd (Apache), but there are other services also possible (nginx, lighthttpd, …)
# make sure Apache is running and started # it normally already is chkconfig --levels 235 httpd on # just in case its not yet service httpd start # create a new file touch /etc/httpd/conf.d/librenms.conf # then add # note : change librenms.example.com ! <VirtualHost *:80> DocumentRoot /opt/librenms/html/ ServerName librenms.example.com CustomLog /opt/librenms/logs/access_log combined ErrorLog /opt/librenms/logs/error_log AllowEncodedSlashes On <Directory "/opt/librenms/html/"> AllowOverride All Options FollowSymLinks MultiViews Require all granted </Directory> </VirtualHost> # remove or comment this file : rm /etc/httpd/conf.d/welcome.conf # and finally restart httpd service httpd restart
After that you probably want to add more snmpd servers then only localhost. I used snmp-scan.php for that, you need to set the ranges of ip’s it can search for in config.php
$config['nets'] It is also possible to just add them manually in the web-interface.
Now give it 10-15 minutes to start collecting data and you are ready to login to the web-interface! (set up in Apache setup)
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