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NOTE: These instructions assume you are the root user. If you are not, prepend sudo to the shell commands (the ones that aren't at mysql> prompts) or temporarily become a user with root privileges with sudo -s or sudo -i.


Please note the minimum supported PHP version is 8.1.
The guide below might not have been updated to reflect it!

On the DB Server

This host is where the MySQL database runs. It could be the same machine as your network management server (this is the most common initial deployment scenario).

** Whilst we are working on ensuring LibreNMS is compatible with MySQL strict mode, for now, please disable this after mysql is installed.

You are free to choose between using MySQL or MariaDB:


yum install net-snmp mysql-server mysql-client
chkconfig mysqld on
service mysqld start


yum install net-snmp mariadb-server mariadb-client
chkconfig mariadb on
service mariadb start


Now continue with the installation:

chkconfig snmpd on
service snmpd start
mysql -uroot -p

Enter the MySQL/MariaDB root password to enter the command-line interface.

Create database.

CREATE DATABASE librenms CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
CREATE USER 'librenms'@'localhost' IDENTIFIED BY 'password';
GRANT ALL PRIVILEGES ON librenms.* TO 'librenms'@'localhost';

Replace <ip> above with the IP of the server running LibreNMS. If your database is on the same server as LibreNMS, use localhost as the IP address.

Edit the mysql/mariadb configuration file:

vim /etc/my.cnf

Add the following line:


If you are deploying a separate database server, you also need to specify the bind-address. If your MySQL database resides on the same server as LibreNMS, you should skip this step.

bind-address = <ip>

If you see a line that starts sql-mode then change this to sql-mode="".

Save, and restart MySQL/MariaDB to apply your changes:

service mysqld restart


service mariadb restart

On the NMS

Install necessary software. The packages listed below are an all-inclusive list of packages that were necessary on a clean install of CentOS 6.x. It also requires the EPEL repository. Net_IPv6 is required even if your network environment does not support IPv6.

Note if not using HTTPd (Apache): RHEL requires httpd to be installed regardless of of nginx's (or any other web-server's) presence.

yum install epel-release
yum install php php-cli php-gd php-mysql php-snmp php-pear php-curl httpd net-snmp graphviz graphviz-php mysql ImageMagick jwhois nmap mtr rrdtool MySQL-python net-snmp-utils vixie-cron php-mcrypt fping git
pear install Net_IPv4-1.3.4
pear install Net_IPv6-1.2.2b2

Configure SNMPD on localhost

Edit /etc/snmp/snmpd.conf to enable self-polling. An absolute minimal config for snmpd is:

rocommunity public

You may either edit the default configuration file to your liking, or backup the default config file and replace it entirely with your own. To apply your changes, run service snmpd restart for Centos 6.x. If you have deployed a separate database server, you will likely want to configure snmpd on that host as well.

Adding the librenms-user for Apache

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

Adding the librenms-user for Nginx

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

Using HTTPd (Apache2)

Set httpd to start on system boot.

chkconfig --levels 235 httpd on

In /etc/php.ini, ensure date.timezone is set to your preferred time zone. See for a list of supported timezones. Valid examples are: "America/New York", "Australia/Brisbane", "Etc/UTC". Please also ensure that allow_url_fopen is enabled. Other functions needed for LibreNMS include exec,passthru,shell_exec,escapeshellarg,escapeshellcmd,proc_close,proc_open,popen.

Next, add the following to /etc/httpd/conf.d/librenms.conf

If you are running Apache below version 2.2.18:

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

If you are running Apache 2.2.18 or higher:

<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/">
    AllowOverride All
    Options FollowSymLinks MultiViews
    Require all granted

If the file /etc/httpd/conf.d/welcome.conf exists, you will want to remove that as well unless you're familiar with Name-based Virtual Hosts.

rn /etc/httpd/conf.d/welcome.conf /etc/httpd/conf.d/welcome.conf.bak

Using Nginx and PHP-FPM

If you choose to run Nginx, you will need to install necessary extra software and let it start on system boot.

    yum install nginx php-fpm
    chkconfig nginx on
    chkconfig php-fpm on

Modify permissions and configuration for php-fpm to use nginx credentials.

mkdir /var/lib/php/session
chown root:nginx /var/lib/php -R
vim /etc/php-fpm.d/www.conf      # At line #12: Change `listen` to `/var/run/php5-fpm.sock`
                                 # At line #39-41: Change the `user` and `group` to `nginx`

Add configuration for nginx at /etc/nginx/conf.d/librenms.conf with the following content:

server {
 listen      80;
 root        /opt/librenms/html;
 index       index.php;
 access_log  /opt/librenms/logs/access_log;
 error_log   /opt/librenms/logs/error_log;
 location / {
  try_files $uri $uri/ @librenms;
 location ~ \.php {
  fastcgi_param PATH_INFO $fastcgi_path_info;
  include fastcgi.conf;
  fastcgi_split_path_info ^(.+\.php)(/.+)$;
  fastcgi_pass unix:/var/run/php5-fpm.sock;
 location ~ /\.ht {
  deny all;
 location @librenms {
  rewrite api/v0(.*)$ /api_v0.php/$1 last;
  rewrite ^(.+)$ /index.php/$1 last;


You can clone the repository via HTTPS or SSH. In either case, you need to ensure the appropriate port (443 for HTTPS, 22 for SSH) is open in the outbound direction for your server.

cd /opt
git clone librenms
cd /opt/librenms

NOTE: The recommended method of cloning a git repository is HTTPS. If you would like to clone via SSH instead, use the command git clone [email protected]:librenms/librenms.git librenms instead.

Prepare the Web Interface

To prepare the web interface, you'll need to create and chown a directory as well as create an Apache vhost.

First, create and chown the rrd directory and create the logs directory

mkdir rrd logs
chown -R librenms:librenms /opt/librenms
chmod 775 rrd

If you're planning on running rrdcached, make sure that the path is also chmod'ed to 775 and chown'ed to librenms:librenms.


if you're using SELinux you need to allow web server user to write into logs directory. semanage tool is a part of policycoreutils-python, so if don't have it, you can install it Please note that running LibreNMS with SELinux is still experimental and we cannot guarantee that everything will be working fine for now.

    yum install policycoreutils-python
    semanage fcontext -a -t httpd_sys_content_t '/opt/librenms/logs(/.*)?'
    semanage fcontext -a -t httpd_sys_rw_content_t '/opt/librenms/logs(/.*)?'
    restorecon -RFvv /opt/librenms/logs/

Set selinux to allow httpd to sendmail

    setsebool -P httpd_can_sendmail=1

Start the web-server

# For HTTPd (Apache):
service httpd restart

# For Nginx:
service nginx restart

Web Installer

At this stage you can launch the web installer by going to http://IP/install.php and follow the on-screen instructions. Alternatively if you want to continue the setup manually then perform the manual install steps. If you cannot reach the installer, stop here and solve that problem before proceeding. Afterwards, Add the following line to the end of config.php:

$config['fping'] = "/usr/sbin/fping";

Manual Install

You may skip this section if the web installer succeeded.

cp config.php.default config.php
vi config.php

Change the values to the right of the equal sign for lines beginning with $config[db_] to match your database information as previously configured.

Change the value of $config['snmp']['community'] from public to whatever your default read-only SNMP community is. If you have multiple existing communities in your environment, set it to the most common.

Add the following line to the end of config.php:

$config['fping'] = "/usr/sbin/fping";

Important: Be sure you have no characters (including whitespace like: newlines, spaces, tabs, etc) outside of the <?php?> blocks. Your graphs will break otherwise and there will be no error messages to indicate otherwise!

Initialize the database

Initiate the follow database with the following command:

php includes/sql-schema/update.php

Create admin user

Create the admin user - priv should be 10

php adduser.php <name> <pass> 10 <email>

Substitute your desired username, password and email address--and leave the angled brackets off.

Validate your install

After performing the manual install or web install, be sure to run validate.php as root in the librenms directory:

php validate.php

This will check your install to verify it is set up correctly.

Add localhost

php addhost.php localhost public v2c

Replace public to match what you set in /etc/snmp/snmpd.conf. This command also assumes you are using SNMP v2c. If you're using v3, there are additional steps (NOTE: instructions for SNMPv3 to come).

Discover localhost:

php discovery.php -h all

Create cronjob

The polling method used by LibreNMS is, which was placed in the public domain by its author. By default, the LibreNMS cronjob runs with 16 threads. The current LibreNMS recommendation is to use 4 threads per core. The default if no thread count is 16 threads.

If the thread count needs to be changed, you can do so by editing the cron file (/etc/cron.d/librenms). Just add a number after, as in the below example:

/opt/librenms/ 12 >> /dev/null 2>&1

Create the cronjob

cp dist/librenms.cron /etc/cron.d/librenms

NOTE: Keep in mind that cron, by default, only uses a very limited set of environment variables. You may need to configure proxy variables for the cron invocation. Alternatively adding the proxy settings in config.php is possible too. The config.php file will be created in the upcoming steps. Review the following URL after you finished librenms install steps:

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 misc/librenms.logrotate /etc/logrotate.d/librenms

Daily Updates

LibreNMS performs daily updates by default. At 00:15 system time every day, a git pull --no-edit --quiet is performed. You can override this default:


lnms config:set update false

Install complete

Please allow for 2-3 runs of the poller-wrapper for data to start appearing in the WebUI. If you don't see data after this, please refer to the FAQ for assistance.

That's it! You now should be able to log in to Please note that we have not covered HTTPS setup in this example, so your LibreNMS install is not secure by default. Please do not expose it to the public Internet unless you have configured HTTPS and taken appropriate web server hardening steps.

It would be great if you would consider opting into the stats system we have, please see this page on what it is and how to enable it.