Monitors

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Service Monitors in Version 1.2.0

In addition to many, many user-contributed monitors found at http://mon.cvs.sourceforge.net/mon/mon-contrib/, the following monitors are just some which ship with the main distribution:

  • ICMP echo (ping) Efficient host reachability via ICMP echo, using fping, which multiplexes pings using a single process. If a group of hosts is pinged, and if more than one fails, then the collective timeout before the monitor script returns is what it would normally be if you're pinging only one host.
  • SMTP SMTP connectivity is tested by connecting to the SMTP port on one or more servers, listening for a "220" response, sending a "QUIT", and waiting for a "221" response and then a shutdown.
  • Telnet Waits for an actual login prompt to determine if the service is working. This uses Wietse Venema's tcp_scan utility.
  • FTP FTP connectivity is tested by connecting to the FTP server, sending a "quit", and waiting for the appropriate response.
  • NNTP Similar to SMTP testing, speaks the NNTP protocol.
  • HTTP Speaks the HTTP protocol to fetch a URL from an HTTP server. The http_tppnp monitor can measure page delivery latency and report failures if a minimum transfer speed is not met. There are several other variants of the HTTP monitor for use in different situations.
  • POP-3 Similar to SMTP, speaks POP-3 to connect and then log out.
  • IMAP Similar to POP-3, speaks IMAP to connect and then log out.
  • TCP-based services Any simple TCP-based service can be tested. mon comes with a "tcp.monitor" utility (which is a wrapper for Wietse Venema's tcp_monitor from the Satan distribution). This will send output to a server and wait for a particular response, with a timeout.
  • Disk space Disk space monitoring for hosts via local mounts, via SNMP's HOST-RESOURCES MIB, and for Network Appliance (netapp) NAS devices via SNMP
  • Uptime via Asynchronous SNMP Calculate the uptime and downtime of any SNMP-capable host. Hundreds of hosts can be polled in a few seconds using the asynchronous method.
  • HP Printers via SNMP Using SNMP, hpnp.monitor polls HP printers with JetDirect interfaces and can detect paper outages, paper jams, toner cartridge problems, and more. When a failure is detected, it can report the message which is displayed on the printer's LCD, e.g. "TRAY 2 EMPTY".
  • LPD Print Servers The lpd.monitor can monitor the status of print queues for stalled jobs, stalls, and multiple failed job delivery attempts as reported by LPRng
  • Processes via SNMP process.monitor polls the UCD SNMP agents on some number of hosts and reports problems with particular processes. This monitor is useful to detect if a particular process has died off.
  • Network Appliance disk space via SNMP netappfree.monitor polls Network Appliance filers for free space on each exported filesystem. It does not require that you mount the filesystems on the mon host. Per-filesystem low watermarks are configured in a separate configuration file for easy changing without resetting the mon server.
  • Network Appliance quota trees via SNMP na_quote.monitor can monitor free space on multiple quota trees. Currently a work-in-progress.
  • LDAP ldap.monitor searches an LDAP server for objects which match a particular filter.
  • DNS dns.monitor queries a zone master for base information, and then queries one or more secondaries, comparing the serial number found in the SOA record to that of the master.
  • Dial-in terminal servers dialin.monitor can periodically dial in to a terminal server or some other modem host and report whether or not a connection was successfully made to the remote host, and if a login prompt was obtained.
  • mSQL and MySQL and PostgreSQL databases The msql-mysql monitor connects to the database in question and list the tables to ensure that the host is responding to queries.
  • Network latency up_rtt.monitor uses the UDP or TCP echo service to measure the round-trip time between the monitoring server and a set of hosts. If the measured latency exceeds a minimum, then a failure is reported.
  • Sun RPC Services The RPC monitor can call the RPC NULL function to determine if a server is responding to queries. This method can be used to poll NIS, NFS, mountd, and other popular services which use Sun RPC.
  • Foundry chassis Report power supply, fan, temperature, module failures in Foundry BigIron and FastIron routers and bridges.
  • Compaq Presario chassis Report power supply, fan, and temperature problems with Presario systems via the "Insight Manager" SNMP agent.
  • Brocade SilkWorm Fiber Channel switches Report PSU, fan, and temperature, PHY, and link problems.
  • syslog Syslogs can be monitored for indicative text using regular expressions
  • mon mon can even monitor other mon servers, which can be useful for building a high-availability pair of monitoring systems
  • Unix Processes using the Net-SNMP agent, monitor processes on Unix hosts (are essential processes still running?)
  • NTP Ensure time synchronization between hosts is working via NTP
  • Reboot Has a host rebooted? This is determined by monitoring the system's uptime via SNMP
  • Traceroute Detect when routes between the mon server and other things change

Mon can also do motion detection with a webcam!

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