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

learn more… | top users | synonyms

58
votes
5answers
19k 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 ...
38
votes
4answers
22k 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 ...
31
votes
24answers
8k 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 ...
25
votes
3answers
4k 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 ...
21
votes
13answers
58k 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 ...
18
votes
4answers
2k views

Monitoring production server [closed]

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
8k 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 ...
15
votes
9answers
9k 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 ...
15
votes
2answers
3k 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 ...
14
votes
5answers
48k 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 ...
14
votes
6answers
1k 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. ...
14
votes
3answers
10k 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 ...
14
votes
7answers
6k 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% ...
13
votes
1answer
10k 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.
12
votes
2answers
1k 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 complex;...
11
votes
4answers
13k 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 ...
11
votes
9answers
9k views

Nagios configuration GUI [closed]

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
3k 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
3k 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
3answers
19k views

How to stop/Disable Nagios email notifications

How Can I stop the email notifications. I am setting up a new server and getting tons of notifications. Wants to disable them for time being.
10
votes
6answers
21k 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
10
votes
1answer
3k views

Why does getfattr not display anything for a file that has the extended attribute bit set?

I've got a Nagios XI install running on CentOS 6.2, and want to modify the backup script. I noticed that the extended attribute bit is set for this shell script, so I want to be sure not to mess ...
9
votes
6answers
15k 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 ...
9
votes
7answers
3k views

Clever nagios alert methods

We use Nagios, and I get SMSs when something happens. Lots of other sysadmins also get texts. However is there any clever / cool other ways people have gotten nagios alerts?
9
votes
6answers
2k 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
4answers
12k 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 ...
9
votes
2answers
2k 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 ...
9
votes
7answers
15k 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
5k 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
15k 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
4k 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
4answers
24k views

Monitor ssh on non-default port with Nagios

I just deployed Nagios on a Gentoo server and everything is fine except ssh, which it marks as "CRITICAL" because it's refusing connections. But that's because it's running on a port different from ...
8
votes
5answers
4k views

Nagios server best practices?

I run a medium-sized Nagios server. It monitors roughly 40 servers with 180 services currently and is only growing by the day. I migrated from an old Nagios setup that was configured in a very ...
8
votes
7answers
3k views

Nagios Check that Simulates Web Full Rendering Time

Does anyone know of a Nagios plugin or cli program that can simulate the load time of a webpage as it would be in a browser. For example the resulting total load time of something like Pingdom's Full ...
8
votes
3answers
14k views

How to check when yum update was last run

Is there a canonical way to find out the last time that yum update was run on a system? Our set up is that we have staging servers that run automatic updates, and provided they don't fall over, we ...
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
2answers
5k views

How might I cancel scheduled downtime on Nagios

I have a Nagios 3.5.1 monitor up for a bunch of servers. In doing an action like a Drupal or Wordpress core upgrade, I down the sites and set Nagios to scheduled outage. Sometimes I finish in under ...
8
votes
2answers
473 views

Is it reasonable to use Nagios to check that a service is NOT available?

Suppose I have a server with a private interface and a public interface. Public might have things like HTTP(S) servers, private might have MySQL and SSH. Obviously Nagios is useful to check that the ...
8
votes
2answers
9k views

How to check HTTP response code of a secured website with Nagios?

I want to create a nagios check of my secure website. All the check needs to do is login to the site with login details that I pass the script. Does anyone know of a plugin or script that will allow ...
8
votes
3answers
9k 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 http://www.monitoringexchange.org/cgi-bin/page.cgi?g=...
8
votes
1answer
909 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
5answers
33k views

What Warning and Critical values to use for check_load?

Right now I am using these values: # y = c * p / 100 # y: nagios value # c: number of cores # p: wanted load procent # 4 cores # time 5 minutes 10 minutes 15 minutes # warning: 90% ...
7
votes
5answers
11k views

Network port open, but no process attached?

I have a weird situation going on with an open network port. My main question is, why would there not be a program associated with an open TCP port: netstat -ln --program Active Internet connections (...
7
votes
5answers
7k 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 ...
7
votes
8answers
20k 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.
7
votes
7answers
8k 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 ...
7
votes
6answers
7k 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 ...
7
votes
3answers
3k 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 ...
7
votes
4answers
5k 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
1k 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?