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. Agent Setup
  2. Apache - SNMP extend
  3. BIND9/named - Agent
  4. DHCP Stats - SNMP extend
  5. GPSD - Agent
  6. Mailscanner - SNMP extend
  7. Memcached - SNMP extend
  8. MySQL - Agent
  9. NGINX - Agent
  10. NTP Client - SNMP extend
  11. NTP Server - SNMP extend
  12. OS Updates - SNMP extend
  13. PowerDNS - Agent
  14. PowerDNS Recursor - Direct, Agent
  15. Proxmox - SNMP extend
  16. Raspberry PI - SNMP extend
  17. TinyDNS/djbdns - Agent
  18. Unbound - Agent
  19. UPS-nut - SNMP extend
  20. UPS-apcups - SNMP extend
  21. EXIM Stats - SNMP extend
  22. Munin - Agent
  23. PHP-FPM - SNMP extend
  24. Fail2ban - SNMP extend

Apache

Either use SNMP extend or use the agent.

SNMP Extend
  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/apache-stats.py -O /etc/snmp/apache-stats.py
  1. Make the script executable (chmod +x /etc/snmp/apache-stats.py)
  2. Verify it is working by running /etc/snmp/apache-stats.py (In some cases urlgrabber needs to be installed, in Debian it can be achieved by: apt-get install python-urlgrabber)
  3. Edit your snmpd.conf file (usually /etc/snmp/snmpd.conf) and add:
extend apache /etc/snmp/apache-stats.py
  1. Restart snmpd on your host
Agent

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

  1. Verify it is working by running /usr/lib/check_mk_agent/local/apache (If you get error like "Can't locate LWP/Simple.pm". libwww-perl needs to be installed: apt-get install libwww-perl)
  2. On the device page in Librenms, edit your host and check the Apache under the Applications tab.

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.

DHCP Stats

A small shell script that reports current DHCP leases stats.

SNMP Extend
  1. Copy the shell script to the desired host (the host must be added to LibreNMS devices)
  2. Make the script executable (chmod +x /etc/snmp/dhcp-status.sh)
  3. Edit your snmpd.conf file (usually /etc/snmp/snmpd.conf) and add:
extend dhcpstats /etc/snmp/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.

GSPD

A small shell script that reports GPSD status.

Agent

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

You may need to configure $server or $port.

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

Mailscanner

SNMP Extend
  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/mailscanner.php -O /etc/snmp/mailscanner.php
  1. Make the script executable (chmod +x /etc/snmp/mailscanner.php)
  2. Edit your snmpd.conf file (usually /etc/snmp/snmpd.conf) and add:
extend mailscanner /etc/snmp/mailscanner.php
  1. Restart snmpd on your host
  2. On the device page in Librenms, edit your host and check the Mailscanner under the Applications tab.

Memcached

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

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.

CentOS

yum install php-cli php-mysql

Debian

apt-get install php5-cli php5-mysql

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;
}

NTP Client

A shell script that gets stats from ntp client.

SNMP Extend
  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/ntp-client.sh -O /etc/snmp/ntp-client.sh
  1. Make the script executable (chmod +x /etc/snmp/ntp-client.sh)
  2. Edit your snmpd.conf file (usually /etc/snmp/snmpd.conf) and add:
extend ntp-client /etc/snmp/ntp-client.sh
  1. Restart snmpd on your host
  2. On the device page in Librenms, edit your host and check the NTP Client under the Applications tab.

NTP Server (NTPD)

A shell script that gets stats from ntp server (ntpd).

SNMP Extend
  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/ntp-server.sh -O /etc/snmp/ntp-server.sh
  1. Make the script executable (chmod +x /etc/snmp/ntp-server.sh)
  2. Edit your snmpd.conf file (usually /etc/snmp/snmpd.conf) and add:
extend ntp-server /etc/snmp/ntp-server.sh
  1. Restart snmpd on your host
  2. On the device page in Librenms, edit your host and check the NTP Server under the Applications tab.

OS Updates

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

For pacman users automatically refreshing the database, it is recommended you use an alternative database location --dbpath=/var/lib/pacman/checkupdate

SNMP Extend
  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/os-updates.sh -O /etc/snmp/os-updates.sh
  1. Make the script executable (chmod +x /etc/snmp/os-updates.sh)
  2. Edit your snmpd.conf file (usually /etc/snmp/snmpd.conf) and add:
extend osupdate /etc/snmp/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.

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.

Proxmox

  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/agent-local/proxmox -O /usr/local/bin/proxmox
  2. Make the script executable: chmod +x /usr/local/bin/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.

Raspberry PI

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

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

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.

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:
        extended-statistics: yes
        statistics-cumulative: yes

remote-control:
        control-enable: yes
        control-interface: 127.0.0.1

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

UPS-nut

A small shell script that exports nut ups status.

SNMP Extend
  1. Copy the ups nut to /etc/snmp/ on your host.
  2. Make the script executable (chmod +x /etc/snmp/ups-nut.sh)
  3. Edit your snmpd.conf file (usually /etc/snmp/snmpd.conf) and add:
extend ups-nut /etc/snmp/ups-nut.sh
  1. Restart snmpd on your host
  2. On the device page in Librenms, edit your host and check the UPS nut under the Applications tab.

UPS-apcups

A small shell script that exports apcacess ups status.

SNMP Extend
  1. Copy the ups apcups to /etc/snmp/ on your host.
  2. Make the script executable (chmod +x /etc/snmp/ups-apcups.sh)
  3. Edit your snmpd.conf file (usually /etc/snmp/snmpd.conf) and add:
extend ups-apcups /etc/snmp/ups-apcups.sh
  1. Restart snmpd on your host
  2. On the device page in Librenms, edit your host and check the UPS apcups under the Applications tab.

EXIM Stats

SNMP extend script to get your exim stats data into your host.

SNMP Extend
  1. Copy the exim stats to /etc/snmp/ (or any other suitable location) on your host.
  2. Make the script executable: chmod +x /etc/snmp/exim-stats.sh
  3. Edit your snmpd.conf file (usually /etc/snmp/snmpd.conf) and add:
extend exim-stats /etc/snmp/exim-stats.sh
  1. If you are using sudo edit your sudo users (usually visudo) and add at the bottom:
snmp ALL=(ALL) NOPASSWD: /etc/snmp/exim-stats.sh, /usr/bin/exim*
  1. Restart snmpd on your 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.

Munin

Agent

  1. Install the script to your agent: wget https://raw.githubusercontent.com/librenms/librenms-agent/master/agent-local/munin -O /usr/lib/check_mk_agent/local/munin
  2. Make the script executable (chmod +x /usr/lib/check_mk_agent/local/munin)
  3. Create the munin scripts dir: mkdir -p /usr/share/munin
  4. Install your munin scripts into the above directory.

To create your own custom munin scripts, please see this example:

#!/bin/bash
if [ "$1" = "config" ]; then
    echo 'graph_title Some title'
    echo 'graph_args --base 1000 -l 0' #not required
    echo 'graph_vlabel Some label'
    echo 'graph_scale no' #not required, can be yes/no
    echo 'graph_category system' #Choose something meaningful, can be anything
    echo 'graph_info This graph shows something awesome.' #Short desc
    echo 'foobar.label Label for your unit' # Repeat these two lines as much as you like
    echo 'foobar.info Desc for your unit.'
    exit 0
fi
echo -n "foobar.value " $(date +%s) #Populate a value, here unix-timestamp

PHP-FPM

SNMP Extend
  1. Copy the shell script, phpfpm-sp, to the desired host (the host must be added to LibreNMS devices) (wget https://github.com/librenms/librenms-agent/raw/master/snmp/phpfpm-sp -O /etc/snmp/phpfpm-sp)
  2. Make the script executable (chmod +x /etc/snmp/phpfpm-sp)
  3. Edit your snmpd.conf file (usually /etc/snmp/phpfpm-sp) and add:
extend phpfpmsp /etc/snmp/phpfpm-sp

5: Edit /etc/snmp/phpfpm-sp to include the status URL for the PHP-FPM pool you are monitoring. 6. Restart snmpd on your host 7. On the device page in Librenms, edit your host and check PHP-FPM under the Applications tab.

It is worth noting that this only monitors a single pool. If you want to monitor multiple pools, this won't do it.

Fail2ban

SNMP Extend

1: Copy the shell script, fail2ban, to the desired host (the host must be added to LibreNMS devices) (wget https://github.com/librenms/librenms-agent/raw/master/snmp/fail2ban -O /etc/snmp/fail2ban)

2: Make the script executable (chmod +x /etc/snmp/fail2ban)

3: Edit your snmpd.conf file (usually /etc/snmp/fail2ban) and add:

extend fail2ban /etc/snmp/fail2ban

4: Edit /etc/snmp/fail2ban to match the firewall table you are using on your system. You should be good if you are using the defaults. Also make sure that the cache variable is properly set if you wish to use caching. The directory it exists in, needs to exist as well. To make sure it is working with out issue, run '/etc/snmp/fail2ban -u' and make sure it runs with out producing any errors.

5: Restart snmpd on your host

6: If you wish to use caching, add the following to /etc/crontab and restart cron.

*/3    *    *    *    *    root    /etc/snmp/fail2ban -u 

7: Restart or reload cron on your system.

8: On the device page in Librenms, edit your host and check Fail2ban under the Applications tab.

In regards to the totals graphed there are two variables banned and firewalled. Firewalled is a count of banned entries the firewall for fail2ban and banned is the currently banned total from fail2ban-client. Both are graphed as the total will diverge with some configurations when fail2ban fails to see if a IP is in more than one jail when unbanning it. This is most likely to happen when the recidive is in use.

If you have more than a few jails configured, you may need to use caching as each jail needs to be polled and fail2ban-client can't do so in a timely manner for than a few. This can result in failure of other SNMP information being polled.