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• Monitoring over Time with Nagios: How?

  - by David

  Nagios in its standard usage monitors with point-in-time checks: either something is - or is not - true. Other tools like SGI's PCP, HP's MeasureWare, and SEC provide monitoring over time - monitoring things like average disk access time over the last five minutes, or other similar items. Is there anything like this for Nagios? I'm already running NDOUtils, which seems like a natural source for such data. I'd like to have something that would monitor and fire off alarms based on a time-based check using historical data. Is there anything like this for Nagios?

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• pfsense CARP - wan failure on firewall

  - by eldblz

  I have recently configured 2 firewall (on 2 DELL PowerEdge R210II with ESXI 5.1) with pfsense. We have several LANs and 2 WANs. Everything is running fine but i have a strange behavior: i can access internet from alla LANs but not from the firewall (itself). For example the firewall cannot retrive package information or if i setup a gatway monitor ip (like google 8.8.8.8 ) this fails. These are the screenshots of firewall configuration: http://imgur.com/a/LNuMz#0 ATM i kept firewall rules to minimum to avoid problem or conflicts. Any ideas how to solve the problem? Thank you in advance.

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• How do I fake 2 discrete monitors using a DualHead2Go?

  - by Sietse

  I just got a [Matrox Dualhead2Go|http://www.matrox.com/graphics/en/products/gxm/dh2go/] for use with my MacBook Pro. I realise that the reason it works is that it fakes 1 big (wide) monitor. I also kind of depended on the software that came with it to trick OSX into accepting it as 2 monitors. Turns out the support is kind of lame: it just adds shortcuts for maximizing the window to whatever screen you want. And it even gets that wrong, since my dock doesn't auto-hide, but it doesn't take it in account while resizing, causing my window do end up "behind" my dock. (I've made a AppleScript that does the resize correctly, that I'll post below). There's two glaring issues this causes: Full screen (video, etc.) takes up both monitors, and dialogs just pops up in the middle. Is there a way to trick OSX, or at least a way to fix these issues?

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• Why does ganglia think my host is down?

  - by NZKoz

  I have ganglia set up to monitor our staging server, it's working great but I'm confused by the definition of 'down' to ganglia. There's a single node, running gmetad, gmond and the web frontend, but some small percentage of the time the web frontend shows some confusing output. Despite the fact that it's a single server in the cluster, and that server is the one serving the web interface, the dashboard output insists that the host is down. Then below that it has a graph which shows 50% down, 50% up. You can see an example of this here: http://i.imgur.com/MCWaS.jpg There's obviously something confusing ganglia somewhere, but I'm not sure where to start looking. Unfortunately googling for any combination of 'ganglia' 'down' 'metric name' seems return nothing but other people's ganglia installations displaying the same nonsense. Any tips on where to start looking would be greatly appreciated

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• [xUbuntu] Move a window back into the visible area?

  - by Johan

  Hi I have this annoying little problem on my laptop that sometimes after I have used a external monitor (with higher resolution) some applications place them self outside the visible area of my desktop. So the question is how do I move them back into the visible area? (please note that no part of the window is visible so I can't use the mouse) Is there some app that can give me focus to move a application to the mouse pointer or something like that? Please note that I'm running xUbuntu (xfce) on this laptop. Thanks Johan

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• SNMP keeps crashing

  - by jldugger

  We're using OpsView/Nagios to monitor our servers. We've added the SNMP service to all our servers and deployed the configuration via GPO, but one win2k3 server seems to have a problem; it crashes pretty regularly. The event log carries messages like: Event Type: Error Event Source: Service Control Manager Event Category: None Event ID: 7034 Date: 6/11/2009 Time: 7:11:49 PM User: N/A Computer: HOSTNNAME Description: The SNMP Service service terminated unexpectedly. It has done this 2 time(s). and also Event Type: Error Event Source: Application Error Event Category: (100) Event ID: 1000 Date: 6/11/2009 Time: 7:11:18 PM User: N/A Computer: HOSTNAME Description: Faulting application snmp.exe, version 5.2.3790.3959, faulting module ntdll.dll, version 5.2.3790.3959, fault address 0x000417af. Now, I could probably set it to simply restart on crash in perpetuity, but I think it's better to fix problems like this. Is this a known problem? If not, what should I do to diagnose it?

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• Monitoring Dell/HP Servers Running ESXi (Free)

  - by Untalented

  What are you all doing to monitor ESXi servers that run the free edition? With the lack of SNMP support, it seems fairly limited to me. What'd I'd like to be able to do is get some type of alert when a drive or other hardware fails. I've seen a few articles on getting OpenManage installed on an ESXi box (to rebuild an array), but it seems to be quite a pain as well. Even if I get OpenManage working, I won't have alerts without SNMP. Any comments, input, or guidance would be greatly appreciated.

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• Radeon hd 6570 black screen

  - by Sho

  I got some problem with new graphic card. Every time I use AMD Catalyst drivers on Windows or Linux, screen repeatedly goes black. This usually shows u when i open new cards in a browser, resize a window or run a program. Card runs smoothly on basic drivers but this means low resolution. 1940x1080 is native for my monitor so it causes a lot of problems. I've got a 600W Deus G1, so the power is not the problem. Maybe its a silly question, but would going form a vga cable to hdmi help to improve this situation? If not, can it be caused by slow processor or old mainboard? Im getting kinda confused about this whole thing...

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• Monitoring ASA packet loss via SNMP

  - by dunxd

  I want to monitor packet loss on my ASA 5505 VPN endpoints using SNMP. This is so I can graph the rates in Cacti and/or get alerts in Nagios. However, I am not sure what SNMP values I should use to measure packet loss. In the ASA I can run sh interface Internet stats to show traffic statistics for the interface connected to the Internet. This shows 1 minute and 5 minute drop rates. Are these measures an indicator of packet loss? Are there SNMP values I can access that correspond to those values? Should I be looking at different values? Is the ASA even able to measure packet loss?

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• Ubuntu displaying GDM but no login

  - by Shawn

  Ubuntu (Wubi, Lucid Lynx) boots and shows the login screen itself with the background and plays the boot sound but a list of users is never displayed. A mouse is on screen and I can move it but, alas, it does nothing. Dropping to a virtual term with CTRL+Alt+F# drops me to a cursor but I can't actually input anything. I can't boot into single-user with GRUB since it's Wubi and it never specifies a boot kernel directly in GRUB's initial menu.lst (only in files that it then reads from). Other details that may be helpful: Single monitor Same video card that's been working for months No new hardware Edit: I ssh'd in since it evidently booted up the sshd which is handy. dpkg-reconfigure gdm didn't do anything helpful. I do, however, get a "no seat-id found" when manually running it.

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• Does anyone know about nagios plugin that uses nmap and does port checking??

  - by Eedoh

  Hi to all. I need to monitor open and closed ports on dozens of hosts. I've found a Nagios plugin that does what I need, but I would have to use this script through nrpe. Some of the hosts are powered by linux and they all have perl installed. But some of them are Windows machines, and it's not convenient for me to install perl on every one of them. That's why I can not use this plugin. I hope that there's Nagios plugin that uses nmap, or something similar, so it could check ports on every host remotely, without installing plugins on remote hosts, only on server.

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• Cloned screen on monitors with different resolutions

  - by jrtokarz

  I want to set up a system with two displays connected. One display will be a 22inch monitor with a native resolution of 1920x1080. The other display is a 19inch display native resolution 1024x768. I want to clone the 1920x1080 display on to the 1024x768 display. I have tried this and the 1080p image is squashed on to the smaller display. Is it possible to set it up such that rather than squashing the image, I can get the smaller display to use a virtual resolution of 1920x1080 and pan the display?

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• How to crop black bars or zoom on Youtube and other Video websites?

  - by cloneman

  Many desktop software (VLC, MPC) and have an option to 'zoom in' , 'crop black bars', or crop to a specific aspect ratio. How can we do this in Fullscreen on Youtube or other flash Video sites? I am the viewer, NOT the video's creator/publisher. iOS Can do this (double tap to zoom, which removes black bars, zoom depth not configurable). afaik, Desktop computers (and android devices), cannot do this on the fly. The only 'workaround' I've found is F11 and zooming of the entire web page - basically a fake full screen and zooming the web page beyond the screen size. Use Case: watching 4:3 flash videos from the web on a widescreen monitor. Looking for all creative solutions, including any software that accesses YouTube without using a web browser.

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• upgrading my computer system for office use

  - by denise ellul

  Presently I have the under-mentioned computer system. What should be changed and upgraded with the following products that I own presently? I am interested in performance issues related to cache memory, bus speed, RAM, CAS latency as well as other considerations. Thanks for your help. Processor (CPU): Intel Celeron Dual Core E3300 2.5 GHz Motherboard: Asus P5QPL-AM G41 Main Memory (RAM): 2 GB Team Elite DDR2 PC8000 Case: Coolermaster RC330 Power Supply Unit: 500W EZ-Cool Standard Storage Device (Hard Drive): 500GB Samsung Video Card: Intel GMA X4500 (On-board) Optical Drive: LG GH22NS50 Sound Card: AC 97 (On – board) Card Reader: Akasa Black TFT Monitor: 19” View Sonic Speakers: Logitech S120 2.0

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• How to cache streaming video and silverlight with squid windows reverse proxy

  - by V. Romanov

  We have an intranet web server running a silverlight application (ACTUS media monitor if anyone cares to know). The server is used to record video and stream it to clients through a CDN solution. We want to put a reverse proxy in between the server and CDN provider in order to remove the office network bottleneck that's currently strangling us. I've set up SQUID for windows on a separate machine outside the network using squid BasicAccelerator configuration setting. It seems to work as far as the reverse proxy is concerned, requests are forwarded and the application is working but it doesn't seem to cache anything (no space is used on the drive where squid is installed). I found to explicit setting to turn caching on in squid, so i assume it's on by default. Perhaps I need some other trick to make the video and/or silverlight cacheable? Any help will be appreciated. Any info you need to help me will be provided at once. Thanks in advance!

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• How can Nagios handle non-threshold based plugins?

  - by FliesLikeABrick

  I am writing a Nagios plugin to monitor trends of a certain storage resource utilization (e.g. gradual increases are fine, but an instantaneous/sudden increase or decrease in resource usage may indicate a problem). For what it's worth, it is reviewing the last N entries in an RRD file generated by a custom cacti data source/templates. What is the "right" way to handle Nagios notification config/implementation for this? The problem is that it the plugin would exit as warning/critical for one polling period, but in the next it would be fine (or 3 polling periods later, if I look at 3 polling periods worth of data). I guess the question is: should I just write it in such a way that it will alert for X polling periods, or should I find a way to write it such that manual intervention is required for it to clear (such as logging into the monitoring server or hitting a URL to run a script that submits a passive result)? Your input is appreciated, and if you have any tips for how to implement the latter I'm open to them (I can think of a few ways to possibly implement it)

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• Screen tearing with GeForce 550 Ti

  - by Konair0s

  Recently I switched to the new monitor and graphic card - DELL U2312HM and GeForce GTX 550 Ti. I have problems with screen tearing (like in this picture from Wikipedia). Usually it is somewhere in upper part of the screen. Mainly happens in videos (in flash videos tearing heavier). In games all fine, except in-game videos (sometimes even videos built on game engine), but gameplay itself is clear, even in very fast actions. Connection with DVI. Problems both in Linux (Debian GNU/Linux, openSUSE 12.1, Linux Mint 13) and Windows (Windows XP, Windows 7), with various driver versions. 1920x1080, 60Mhz. How can I resolve this?

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• Computer Won't Boot After New Power Supply

  - by Haxelgem

  I recently bought a Rosewill 750-M PSU to replace an Antec Earthwatts 500. My computer worked fine before making the switch. After installing the Rosewill PSU, I attempted to boot. Fans spun up for a second, then turned off. After a second, they spun up again and stayed on. However, I had no video output. I put the old Antec PSU back in, and still had the same problem. I put another GPU in the computer, trying both PSUs, and still nothing. I switched out the monitor also, which didn't work. What should I do?

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• VGA resolution with Sony Bravia TV

  - by prestomation

  I just bought Sony Bravia KDL40S5100 tv. The VGA input is acting weird. I have a Gateway desktop with Windows 7 and Intel 945 graphics. I also have a laptop running Ubuntu 9.04. The TV will not display the gateway when the resolution is over 1360x768, I have to wait for it to time out and bring me back. The Intel driver even urges me to switch to the "recommended" 1920x1080. I just installed Win7 using this tv as the monitor. When the orginial welcome screen started after setup, it started me at 1080. I had to start in safemode to set a res that would work! When I plug my laptop into the TV, 1920x1080 works just fine. Any ideas? This laptop also has Win7, which I am going to try, but I haven't gotten a chance yet.

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• RGB to DVI adapter not working for Projector-to-PC

  - by user897052

  We have a wall-mounted projector (dell 4320) with VGA In and the other end of the cable is RGB. We have an RGB to DVI-I adapter (w/ DIP switches) inorder to plug the cable into a PC (video card has 1 VGA and 1 DVI-I port). We had no problems until recently, when the PCs hard drive crashed. After re-imaging the PC, the computer no longer "sees" the projector (the computer doesn't detect the projector as a second monitor anymore). The PC is an older Dell with an after-market video card and runs win XP. I also tried it on a new HP box (win 7), but had to add a DVI-I to DVI-D adapter. Any ideas?

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• Unable to extend desktop

  - by CSharperWithJava

  I'm trying to hook up my TV to my computer as a gaming/multimedia center but I'm having troubles setting it up. I have a custom built machine running Windows 7 RC. It has an ATI Radeon 4800 video card with 2 dvi output and 1 S-video output. I have an s-video to composite adapter that connects to my tv. (It's an old TV with only Cable, composite, and s-video connections). I can switch the desktop to my TV without a problem, but I can't duplicate or extend my desktop onto it. I've installed the latest drivers and Catalyst Control Center, but it won't let it work any more readily than Windows would. Any suggestions? Would using an s-video cable instead of the adapter change anything? (The only reason I use the adapter is because it came with the graphics card) (Edit) I installed the latest drivers and I can now duplicate the screen (show on one monitor and on the TV), but I still can't extend the desktop.

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• Unable to connect to another computer from the Task Scheduler on Windows 7

  - by Clem

  I am getting the following error when trying to connect to another computer from the Task Scheduler on Windows 7: "The remote computer was not found." The computer that I am trying to connect to is definitely on the network as I can ping it and browse its shared folders in Windows Explorer. Note that I get the same error message when trying to perform the same operation from Performance Monitor. This suggests that I need to something to enable remote connection to the Task Scheduler. I am not very experienced with Windows administration and I am not sure where to look. To give a bit more context, I want to use the Task Scheduler to automatically start Perf Mon on a few machines at my company. I'd like to setup the Task Scheduler remotely. Does anyone know what I need to do?

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• Displaying Nagios on a 52" 1080p screen

  - by gdm

  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 amount so it's legible from a distance, and then the "Current Network Status", "Host Status Totals", and other boxes along the top take up the majority of the screen realestate; you can't really see the list of host details. Is there a custom view for Nagios, or a plugin, or something available which is meant to display Nagios details on a large screen with large text?

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• Linux Defualt Startup Display PCI to fix black boot screen

  - by Jonathan

  You heard it all before black screen on boot after perfectly fine install of most linux ubnuntu mint etc distributions (the netbook works fine) It has an Intel N10 integrated graphics chipset. I have actually found that if I plug in an external display then remove it the default screen turns on and my laptop works fine drivers all great - I have tried the screen cycle button fn f7 but doesn't work when no display is plugged in. It also works out all the correct resolutions and no modification of the grub bootloader or creating any xorg configs. So I think my monitor is forcing to a display that doesn't exist. Do you know if there is anyway I can force it to choose a different screen at boot so I can get a login screen? I can use nomodeset on grub but xrandr cant add the damned 1024 600 60 resolution that I need! Ideas guys?

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• Use router as external high powered Wi-Fi adapter

  - by skywinder

  I need a powerful external Wi-Fi adapter for a couple of days. I heard that some types of router support this mode, allowing me to connect the router to my notebook and just use it as an external Wi-Fi interface. Is it possible to connect a router as an external Wi-Fi adapter? How can I determine it? Updated: My purpose is to set the router to monitor mode and check networks around through my notebook to provide better configuration for my network (power, channels, etc). My internal notebook Wi-Fi adapter is too weak for this purpose. Should I use special drivers for that? If yes, can someone describe, step-by-step, how to do it? p.s. I want to use ASUS RT-N56U as an external Wi-Fi adapter on OS X or Ubuntu.

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