Nagios is a powerful monitoring system that enables organizations to identify and resolve IT infrastructure problems before they affect critical business processes.

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35
votes
5answers
11k views

How does Ubuntu keep track of the “System restart required” flag in motd?

I have a few Ubuntu servers (8.10, 9.10) that is set to automatically install security updates. Some times these updates requires a restart of the system, and this string is shown in motd: *** System ...
30
votes
24answers
5k views

What are your most useful/valued Nagios plugins? [closed]

We're expanding our Nagios 3 setup, and are frequently coming across new NRPE or general Nagios plugins to test our existing infrastructure. This is in dribs and drabs though - it would be useful to ...
27
votes
4answers
16k views

Munin vs Nagios

We're currently using Nagios to monitor about 20 Linux machines (services and functional links). I just find out about Munin and I wonder if this is a Nagios replacement, or it can be used together ...
24
votes
3answers
3k views

Shinken - Anyone using it? [closed]

I've recently discovered Shinken, which is a new implementation of Nagios using python. Shinken "divides" Nagios in 5 different types of daemons, each one performing separated tasks. I haven't tried ...
17
votes
4answers
2k views

Monitoring production server

Hey all, We have 3 dedicated server, splitted in several VPS using openVZ. We're using munin to monitor the VPS with the production sites, and monit on some one of the VPS to make sure it restarts the ...
16
votes
8answers
6k views

Nagios alerts by telephone?

I have a couple of nagios servers that currently alert me via SMS and email, but I'd like to add outgoing calls to that. The ideal solution would have the nagios machines call my cellphone and play an ...
14
votes
2answers
2k views

Displaying Nagios on a 52" 1080p screen

I'm using a 52" 1080p LCD screen to monitor Nagios, positioned where most of the users can see it. Using the default Nagios web view sort of sucks, since you need to increase the text size a decent ...
13
votes
6answers
898 views

How do you monitor a monitoring server?

So we run Groundworks (with Nagios) on CentOS to monitor our various servers and processes. I have it setup to automatically send emails and SMS texts when things reach a WARNING or CRITICAL state. ...
12
votes
9answers
6k views

There is any monitoring hosted solution? [closed]

I know Zabbix and Nagios, but I don't know any company that host those services for others to use. I would like to find a solution that monitored at least some of my public URLs (if they are ...
12
votes
7answers
4k views

How can I force a MySQL table to become corrupted?

I have written a simple Nagios plugin that calls mysqlcheck (which checks for corrupted tables) and will give a warning if any are corrupt. However none of my tables are corrupt now. So I'm not 100% ...
12
votes
2answers
831 views

Geographically distributed, fault-tolerant and “intelligent” application/host monitoring systems

Greetings, I'd like to ask the collectives opinion and view on distributed monitoring systems, what do you use and what are you aware of which might tick my boxes? The requirements are quite ...
11
votes
9answers
8k views

Nagios configuration GUI

We've implemented Nagios for services on our network and it is working great. The notifications are nice and the wide range of configuration options are very handy. Up to this point, we've done all ...
11
votes
5answers
2k views

How do you keep up with Nagios/Capistrano configs when using EC2?

I use Amazon EC2 for my mobile app. Depending on load of the application at a given time, I might spawn new instances and then take them down when load is lower to save costs. How does one keep up ...
11
votes
2answers
2k views

Does anyone use check_mk for Nagios? Anything I should be aware of before considering it?

http://mathias-kettner.de/check_mk.html I've been testing it out on a couple of development machines and it seems pretty nifty. I cannot however find much information on deployments of it. Does ...
10
votes
9answers
22k views

NRPE unable to read output, but why?

I have this problem with NRPE, all the stuff I've found so far on the net seems to point me at things I've already tried. # /usr/local/nagios/plugins/check_nrpe -H nrpeclient gives NRPE v2.12 as ...
9
votes
4answers
2k views

How can I tell if Windows is running in Safe Mode?

I have a Windows server that will sometimes reboot into safe mode after updates. I'm working on that issue but what I'd really like to know is how can I check to see if Windows is running in safe mode ...
9
votes
6answers
1k views

How to monitor Windows host with Nagios?

How do I use Nagios to monitor Windows clients? Are there any alternative solutions available?
9
votes
7answers
9k views

Key differences between Nagios and Open NMS?

I am looking to pitch a comprehensive monitoring system to my manager, and have been considering OpenNMS. However, I have seen glowing praise of Nagios on here and I was hoping someone with experience ...
9
votes
7answers
3k views

Best tool for monitoring backups, etc. and trending statstics from that data [closed]

I have done some research on nagios, opennms, and zenoss but am not confident that I have found what I am looking for. The main driving force for me right now is being able to monitor backups. This ...
9
votes
6answers
10k views

Nagios Monitoring Text on a Website

I was wondering if I could get some help with monitoring text on a website. I.E. If I wanted to monitor google.com for the text "Privacy", I thought I would use the following command: check_http -H ...
9
votes
4answers
2k views

Send Nagios data to central monitoring server

I have Nagios set up on three disjoint networks that are all behind firewalls. The monitoring is working great and I'm getting the hang of the somewhat complex configuration. I have a server that is ...
8
votes
6answers
11k views

Nagios graphing solutions vs Munin/Cacti/Ganglia

I've got a nagios server setup for monitoring ~ 30 Windows servers. I want to add some trending charts. I've read that nagios graphing plugins are simple and many people use seperate, standalone ...
8
votes
4answers
9k views

High load on a nagios server — How many service checks for a nagios server is too many?

I have a nagios server running Ubuntu with a 2.0 GHz Intel Processor, a RAID10 array, and 400 MB of RAM. It monitors a total of 42 services across 8 hosts, most of which are checked using the ...
8
votes
6answers
2k views

Nagios configuration management

I am going to implement Nagios (most likely anyway, could turn out to be another tool as well) and I was wondering if anyone would like to share their best practices when it comes to creating, ...
8
votes
1answer
5k views

Monit versus Nagios

Does nagios offer any additional functionality when compared to monit? This answer states that monit is a clumsy tool for situational awareness, which is the reason I'm asking the question.
8
votes
3answers
8k views

Best Nagios plugin for SMARTd / smartmontools?

I've installed SMARTd / smartmontools on a server and I want to monitor it over Nagios. However on Monitoring Exchange, I see several plugins ...
8
votes
1answer
784 views

How to manage Nagios dependencies on big clusters?

I'm using quite a big nagios configuration (about 4000 services), without any dependencies. This results in a huge mess of notifications when something goes wrong. I try to look for best practices ...
7
votes
3answers
4k views

What is the correct pronunciation of Nagios? [closed]

I've puzzled and debated over this for a while, so it's time to ask the community. What is the correct accepted pronunciation of Nagios, or at least the most common pronunciation? This topic is ...
7
votes
2answers
1k views

Send all outgoing mail to /dev/null

With sendmail, how would you send all outgoing mail to /dev/null or just prevent email from being queued up or sent at all? On a development nagios box I want prevent sending of mail so that ...
7
votes
4answers
4k views

Good methods for monitoring EC2 instances

I'd like to hear your approaches for monitoring Linux instances running in EC2. I'm very accustomed to using Nagios to monitor all manner of aspects of a Web-based application's ecosystem, but its ...
7
votes
3answers
945 views

What are the security risks of making Nagios publicly viewable?

What are the dangers of a public organization, like a college or university, publishing monitoring services like Nagios in a publicly available read only format?
7
votes
3answers
3k views

Is there a way to share S.M.A.R.T. data over SNMP?

Is there a way to share S.M.A.R.T. data over SNMP? I'd like to be able to make cacti graphs of it and hook it up to Nagios. What I want to do is be able to get some statistics on my harddisks ...
7
votes
2answers
375 views

Green-IT: How do you deal with poweroff systems in your system monitoring?

Many of you probably have completed or are contemplating Green-IT projects with the goal to power off idle or unneeded systems when demand for computer resources is low: How you did handle this ...
6
votes
13answers
2k views

Do you have a creative use for nagios?

I'm looking for inspirations on nonstandard uses of monitoring systems like nagios, which is normally used to check whether HTTP is reponding etc. I'm curious how people have taken the simple nagios ...
6
votes
8answers
9k views

How do I configure Nagios mobile / SMS alerts?

How do I send alerts from Nagios monitoring tool to mobile? Any resources or links or tutorials are fine.
6
votes
5answers
5k views

Monitoring VMware ESXi (free) vs. vSphere

I have two hosts running the free ESXi hypervisor. However, we use Nagios for monitoring, and I've received conflicting information about how we should monitor these systems. Are my findings below ...
6
votes
6answers
5k views

How do I refresh nagios and stay on the current page?

Ever since I updated to nagios 3.2.1 from 3.0.6 I can no longer refresh any status pages. When I refresh, it just goes back to the "home" page of nagios, forcing me to drill back down to whatever I ...
6
votes
6answers
4k views

Distributed Nagios Installation

I'm looking for a plug-in or product that will act as a remote probe and perform tests then send back the results to the central Nagios server. Reason for this is that I'd like to monitor internal ...
6
votes
6answers
1k views

Nagios 3 config ideas

We currently have Nagios 2.9 installed and has been running nicely for a few years. I want to migrate it off that old Linux server onto a new one. I've gotten Nagios 3.1.2 installed and running ...
6
votes
3answers
2k views

Is Nagios “monitoring” over WAN ideal?

Just started at a new company and one my first assignments is to look for alternatives to their inhouse monitoring system. Their current solution is a .Net application that checks various devices ...
6
votes
3answers
1k views

Can I set up a different method of authentication on Nagios?

Nagios is a wonderful too for monitoring servers. Their web interface is not bad, either. However I am not crazy about using the HTTP Authentication that comes standard. Is there a way to use another ...
6
votes
3answers
306 views

Nagios3: Conditional operators for service checks?

I'm trying to setup Nagios to monitor my various machines using hostgroups to define 'machine roles', against which I run services to check the machines by role. However, I'd like to use conditional ...
6
votes
3answers
456 views

Is it possible to ack nagios alerts from the terminal on a remote workstation?

I have nagios alerts set up to come through jabber with an http link to ack. Is is possible there is a script I can run from a terminal on a remote workstation that takes the hostname as a parameter ...
6
votes
1answer
238 views

Throttle nagios alerts if host loses connectivity

We use nagios to monitor our server farm, and generally it works great. From time to time, though, the host where nagios runs loses connectivity for a couple of minutes, which makes nagios believe ...
6
votes
2answers
17k views

Nagios “CRITICAL - Socket timeout after 10 seconds” problems with service and host Checks

got a little bit of a problem with a Nagios system we are using in our office, which has only recently started appearing. what i would like to know really is the best solution to resolve this problem ...
6
votes
5answers
4k views

nagios Missing Dependency: perl(Net::SNMP)

I have an odd problem. I'm trying to install nagios NRPE but it keeps failing with nagios-plugins-1.4.15-2.el5.rf.i386 from rpmforge has depsolving problems --> Missing Dependency: ...
6
votes
1answer
4k views

Setting up Dependencies for Nagios

I'm trying to setup dependencies for a router and several servers. What I want to do is setup the router as the Master Host so if the router fails all other services on the servers won't alert. ...
6
votes
5answers
8k views

Defining the email address which Nagios sends emails from

Hi currently Nagios sends notifications from nagios@server.domain.com, How do I go about configuring this? Thanks
6
votes
1answer
623 views

NRPE and Perl - cannot include ANYTHING or it breaks

I've been banging my head off NRPE and Perl for weeks now. I decided to start from absolute first principles, and create a dummy nagios plugin that does nothing but always returns OK. I called it ...
5
votes
4answers
18k views

How can I manually run a nagios check from the command line?

When defining and testing new services in nagios I have been restarting nagios, then clicking the service, and rescheduling a check for as soon as possible, then waiting until the check happens. Is ...