NagMonThe Hosts tab
The Hosts tab lists every monitored host across your enabled servers. Status filters narrow the list to the states you care about:
- Up — responding normally.
- Down — the host itself has failed its check.
- Unreachable — a router, switch, or parent host between Nagios and this host is down, so its true state can't be seen. (More on the distinction in Nagios states explained.)
- Pending — no check result yet, typically right after a host was added or Nagios restarted.
Host icons
If your Nagios server defines icon images for hosts, NagMon shows them. Icons are served from your own Nagios server (its images/logos directory) and cached on the device, so lists stay fast and nothing is fetched from third parties.
Group by host group
Flip on the group-by-host-group toggle and the flat list becomes a sectioned view matching the host groups defined on your server — web servers, database, network gear, however you've organized it. Hosts that belong to no group land in an Ungrouped section, so nothing disappears.
objectjson.cgi on the server. On servers without it, the toggle hides itself — see requirements.The Services tab
The Services tab is the same idea for service checks, with filters for each service state: OK, Warning, Critical, Unknown, and Pending. A common triage pattern: filter to Critical, work the list top to bottom, then widen to Warning.
Sorting
The Hosts, Services, and Alerts tabs each have a sort menu just below the navigation bar. Three orderings are available:
| Sort | Best for |
|---|---|
| Name | Finding a specific host or service when you already know what you're looking for. |
| Status severity | Triage — the worst problems float to the top. |
| State duration | Spotting what just changed (shortest duration first) or what has been broken longest. Duration is how long the item has been in its current state. |
Sort choices are remembered per tab, so you can keep Services on severity for triage while Hosts stays alphabetical.
Host and service detail views
Tap any host or service to open its detail view:
- Status block — the current state, how long it's been in that state, when the last check ran, and the raw plugin output (the same output line you'd see in the web UI, often containing the actual error or the measured values).
- Links card — if the object defines an
action_urlornotes_urlin its Nagios configuration, they appear here as tappable links. Onlyhttp/httpsURLs are shown, and links containing unexpanded$MACROS$are hidden rather than rendered broken. - Navigation — from a service you can jump to its host, and from a host to its services, so you can answer "is it just this check, or is the whole box sick?" in two taps.
The detail view is also where actions live — acknowledging, scheduling downtime, rechecking, and toggling notifications are covered in Taking Action.