Subscription Feature

This is a feature which is currently only included in the Subscription Edition of Observium.

Probes are the Observium term for standardised plugins.

Probe Example

To use the plugins in the probes system, you need to install the relevant packages for your distribution. Plugins are normally installed into /usr/lib/nagios/plugins/.

Observium should automatically detect and allow adding of probes where the corresponding plugin has been installed.

On Debian and Ubuntu install the following packages:

sudo apt install monitoring-plugins-basic monitoring-plugins-common monitoring-plugins-standard

On RedHat, CentOS and Fedora install the following packages. EPEL repository (not required on Fedora):

yum install epel-release
yum install --skip-broken nagios-plugins-all

Packages for other distributions may vary, or they can be installed from source available at

Probes are added directly to a device using the Add Probe navbar item on the probes page, which is accessed from the Globe menu on the top navbar.

Probe Add

Probes will often include some basic defaults, such as automatically including "-H %hostname%" where applicable, or automatically including SNMP community strings. Default arguments can be disabled using the checkbox.

Probes on Unmonitored Devices

Overriding the hostname allows you to perform probe-based checks on devices which otherwise don't exist in Observium. We recommend adding these checks to Observium server's own device entry.

Arguments for individual probes can be found in the documentation, or directly from the commandline:

root@dev:~# /usr/lib/nagios/plugins/check_pop -h
check_pop v2.2 (monitoring-plugins 2.2)
Copyright (c) 1999 Ethan Galstad <>
Copyright (c) 1999-2008 Monitoring Plugins Development Team

This plugin tests POP connections with the specified host (or unix socket).

check_pop -H host -p port [-w <warning time>] [-c <critical time>] [-s <send string>]
[-e <expect string>] [-q <quit string>][-m <maximum bytes>] [-d <delay>]
[-t <timeout seconds>] [-r <refuse state>] [-M <mismatch state>] [-v] [-4|-6] [-j]
[-D <warn days cert expire>[,<crit days cert expire>]] [-S <use SSL>] [-E]

 -S, --ssl
    Use SSL for the connection.
 -w, --warning=DOUBLE
    Response time to result in warning status (seconds)
 -c, --critical=DOUBLE
    Response time to result in critical status (seconds)


Many available probe plugins allow very flexible tests to be performed, the table below lists plugins that Observium supports by default..


host - Passes the device's hostname via -H %hostname% or however the plugin supports

SNMP - Sets community string or SNMPv3 authentication information and timeouts/retries if supported by the plugin

Probe Description Defaults
check_snmp_cisco_wlc Check operability of Cisco APs on a controller. host SNMP
check_snmp_win Check Windows services via SNMP host SNMP
check_tcp Tests TCP connections with the specified host (or unix socket) host
check_udp Tests UDP connections with the specified host (or unix socket) host
check_http Tests the HTTP service on the specified host. It can test normal (http) and secure (https) servers, follow redirects, search for strings and regular expressions, check connection times, and report on certificate expiration times. host
check_clamd Tests clamd connections host
check_ftp Tests FTP connections host
check_haproxy Tests HAProxy health by parsing the stats page host
check_imap Tests IMAP connections host
check_jabber Tests Jabber connections host
check_ldap Tests LDAP/LDAPS connections host
check_nntp Tests NNTP connections host
check_nntps Tests NNTP connections host
check_ping Use ping to check latency and packetloss. host -w 15,2% -c 20,5%
check_pop Tests POP3 connections host
check_simap Tests SIMAP connections host
check_spop Tests SPOP connections host
check_ssmtp Tests SSMTP connections host
check_ssh Tests SSH connections host
check_smtp Tests SMTP connections host
check_mysql Tests connections to a MySQL server host
check_mysql_health Tests various parameters for MySQL health host
check_mysql_query Tests a MySQL query. A query is required. The result from the query should be numeric. For extra security, create a user with minimal access. host
check_ssl_cert Checks an X.509 certificate * checks if the server is running and delivers a valid certificate * checks if the CA matches a given pattern * checks the validity Source & Usage host