Applications

You can use Application support to graph performance statistics from many applications.

Different applications support a variety of ways collect data: by direct connection to the application, snmpd extend, or the agent.

  1. BIND9/named - Agent
  2. MySQL - Agent
  3. NGINX - Agent
  4. [NTPD] (#ntpd-server) - extend SNMP, Agent
  5. PowerDNS - Agent
  6. PowerDNS Recursor - Agent
  7. TinyDNS/djbdns - Agent
  8. OS Updates - extend SNMP
  9. DHCP Stats - extend SNMP
  10. Memcached - extend SNMP
  11. Unbound - Agent
  12. Proxmox - extend SNMP
  13. Raspberry PI - extend SNMP

  14. Agent Setup

BIND9 aka named

Agent

Install the agent on this device if it isn't already and copy the bind script to /usr/lib/check_mk_agent/local/

Create stats file with appropriate permissions:

~$ touch /etc/bind/named.stats
~$ chown bind:bind /etc/bind/named.stats

Change user:group to the user and group that's running bind/named.

Bind/named configuration:

options {
    ...
    statistics-file "/etc/bind/named.stats";
    zone-statistics yes;
    ...
};

Restart your bind9/named after changing the configuration.

Verify that everything works by executing rndc stats && cat /etc/bind/named.stats. In case you get a Permission Denied error, make sure you chown'ed correctly.

Note: if you change the path you will need to change the path in scripts/agent-local/bind.

MySQL

Agent

Install the agent on this device if it isn't already and copy the mysql script to /usr/lib/check_mk_agent/local/

The MySQL script requires PHP-CLI and the PHP MySQL extension, so please verify those are installed.

Unlike most other scripts, the MySQL script requires a configuration file /usr/lib/check_mk_agent/local/mysql.cnf with following content:

<?php
$mysql_user = 'root';
$mysql_pass = 'toor';
$mysql_host = 'localhost';
$mysql_port = 3306;

Verify it is working by running /usr/lib/check_mk_agent/local/mysql

NGINX

NGINX is a free, open-source, high-performance HTTP server: https://www.nginx.org/

Agent

Install the agent on this device if it isn't already and copy the nginx script to /usr/lib/check_mk_agent/local/

It's required to have the following directive in your nginx configuration responsible for the localhost server:

location /nginx-status {
    stub_status on;
    access_log   off;
    allow 127.0.0.1;
    deny all;
}

NTPD Server

Supports NTPD Server (not client, that is separate)

Extend SNMP
  1. Download the script onto the desired host (the host must be added to LibreNMS devices)
wget https://raw.githubusercontent.com/librenms/librenms-agent/master/snmp/ntpd-server.php -o /etc/snmp/ntpd-server.php
  1. Make the script executable (chmod +x /etc/snmp/ntdp-server.php)
  2. Edit your snmpd.conf file (usually /etc/snmp/snmpd.conf) and add:
extend ntpdserver /etc/snmp/ntpd-server.php
  1. Restart snmpd on your host
  2. On the device page in Librenms, edit your host and check the Ntpd-server under the Applications tab.
Agent

Support is built into the agent, and this app will be automatically enabled.

PowerDNS

An authoritative DNS server: https://www.powerdns.com/auth.html

Agent

Install the agent on this device if it isn't already and copy the powerdns script to /usr/lib/check_mk_agent/local/

PowerDNS Recursor

A recursive DNS server: https://www.powerdns.com/recursor.html

Direct

The LibreNMS polling host must be able to connect to port 8082 on the monitored device. The web-server must be enabled, see the Recursor docs: https://doc.powerdns.com/md/recursor/settings/#webserver

Variables

$config['apps']['powerdns-recursor']['api-key'] required, this is defined in the Recursor config $config['apps']['powerdns-recursor']['port'] numeric, defines the port to connect to PowerDNS Recursor on. The default is 8082 $config['apps']['powerdns-recursor']['https'] true or false, defaults to use http.

Agent

Install the agent on this device if it isn't already and copy the powerdns-recursor script to /usr/lib/check_mk_agent/local/

This script uses rec_control get-all to collect stats.

TinyDNS aka djbdns

Agent

Install the agent on this device if it isn't already and copy the tinydns script to /usr/lib/check_mk_agent/local/

Note: We assume that you use DJB's Daemontools to start/stop tinydns. And that your tinydns instance is located in /service/dns, adjust this path if necessary.

  1. Replace your log's run file, typically located in /service/dns/log/run with:
#!/bin/sh
exec setuidgid dnslog tinystats ./main/tinystats/ multilog t n3 s250000 ./main/
  1. Create tinystats directory and chown:
mkdir /service/dns/log/main/tinystats
chown dnslog:nofiles /service/dns/log/main/tinystats
  1. Restart TinyDNS and Daemontools: /etc/init.d/svscan restart Note: Some say svc -t /service/dns is enough, on my install (Gentoo) it doesn't rehook the logging and I'm forced to restart it entirely.

OS Updates

A small shell script that checks your system package manager for any available updates (supports yum/apt-get/zypper package managers).

Extend SNMP
  1. Copy the shell script to the desired host (the host must be added to LibreNMS devices)
  2. Make the script executable (chmod +x /opt/os-updates.sh)
  3. Edit your snmpd.conf file (usually /etc/snmp/snmpd.conf) and add:
extend osupdate /opt/os-updates.sh
  1. Restart snmpd on your host
  2. On the device page in Librenms, edit your host and check the OS Updates under the Applications tab.

Note: apt-get depends on an updated package index. There are several ways to have your system run apt-get update automatically. The easiest is to create /etc/apt/apt.conf.d/10periodic and pasting the following in it: APT::Periodic::Update-Package-Lists "1";. If you have apticron, cron-apt or apt-listchanges installed and configured, chances are that packages are already updated periodically.

DHCP Stats

A small shell script that reports current DHCP leases stats.

Extend SNMP
  1. Copy the shell script to the desired host (the host must be added to LibreNMS devices)
  2. Make the script executable (chmod +x /opt/dhcp-status.sh)
  3. Edit your snmpd.conf file (usually /etc/snmp/snmpd.conf) and add:
extend dhcpstats /opt/dhcp-status.sh
  1. Restart snmpd on your host
  2. On the device page in Librenms, edit your host and check the DHCP Stats under the Applications tab.

Memcached

  1. Copy the memcached script to /usr/local/bin (or any other suitable location) on your remote server.
  2. Make the script executable: chmod +x /usr/local/memcached
  3. Edit your snmpd.conf file (usually /etc/snmp/snmpd.conf) and add:
extend memcached /usr/local/bin/memcached
  1. Restart snmpd on your host
  2. On the device page in Librenms, edit your host and check Memcached under the Applications tab.

Unbound

Agent

Install the agent on this device if it isn't already and copy the unbound.sh script to /usr/lib/check_mk_agent/local/

Unbound configuration:

# Enable extended statistics.
server:
        statistics-interval: 0
        extended-statistics: yes
        statistics-cumulative: yes

Restart your unbound after changing the configuration,v erify it is working by running /usr/lib/check_mk_agent/local/unbound.sh

Proxmox

  1. Download the script onto the desired host (the host must be added to LibreNMS devices) wget https://github.com/librenms/librenms-agent/blob/master/agent-local/proxmox -o /usr/local/bin/proxmox
  2. Make the script executable: chmod +x /usr/local/proxmox
  3. Edit your snmpd.conf file (usually /etc/snmp/snmpd.conf) and add: extend proxmox /usr/local/bin/proxmox (Note: if your snmpd doesn't run as root, you might have to invoke the script using sudo. extend proxmox /usr/bin/sudo /usr/local/bin/proxmox)
  4. Restart snmpd on your host
  5. On the device page in Librenms, edit your host and check Proxmox on the Applications tab.

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Raspberry PI

SNMP extend script to get your PI data into your host.

Extend SNMP
  1. Copy the raspberry script to /opt/ (or any other suitable location) on your PI host.
  2. Make the script executable: chmod +x /opt/raspberry.sh
  3. Edit your snmpd.conf file (usually /etc/snmp/snmpd.conf) and add:
extend raspberry /opt/raspberry.sh
  1. Edit your sudo users (usually visudo) and add at the bottom:
snmp ALL=(ALL) NOPASSWD: /opt/raspberry.sh
  1. Restart snmpd on PI host

Agent Setup

To gather data from remote systems you can use LibreNMS in combination with check_mk (found here).

Make sure that systemd or xinetd is installed on the host you want to run the agent on.

The agent uses TCP-Port 6556, please allow access from the LibreNMS host and poller nodes if you're using the Distributed Polling setup.

On each of the hosts you would like to use the agent on then you need to do the following:

  1. Clone the librenms-agent repository:
cd /opt/
git clone https://github.com/librenms/librenms-agent.git
cd librenms-agent
  1. Copy the relevant check_mk_agent to /usr/bin:
linux freebsd
cp check_mk_agent /usr/bin/check_mk_agent cp check_mk_agent_freebsd /usr/bin/check_mk_agent
chmod +x /usr/bin/check_mk_agent
  1. Copy the service file(s) into place.
xinetd systemd
cp check_mk_xinetd /etc/xinetd.d/check_mk cp check_mk@.service check_mk.socket /etc/systemd/system
  1. Create the relevant directories.
mkdir -p /usr/lib/check_mk_agent/plugins /usr/lib/check_mk_agent/local
  1. Copy each of the scripts from agent-local/ into /usr/lib/check_mk_agent/local that you require to be graphed. You can find detail setup instructions for specific applications above.
  2. Make each one executable that you want to use with chmod +x /usr/lib/check_mk_agent/local/$script
  3. Enable the check_mk service
xinetd systemd
/etc/init.d/xinetd restart systemctl enable check_mk.socket && systemctl start check_mk.socket
  1. Login to the LibreNMS web interface and edit the device you want to monitor. Under the modules section, ensure that unix-agent is enabled.
  2. Then under Applications, enable the apps that you plan to monitor.
  3. Wait for around 10 minutes and you should start seeing data in your graphs under Apps for the device.