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• Distribute Nagios to reduce false alarms

  - by GDR

  I'm currently running a single Nagios instance. From time to time, I'm getting false alarms about timeouts - for example, it says that HTTP is down on some server, but when I open it in my browser several seconds later, it loads fast, and in general there is no trace of an error. What can I do to reduce such false alarms? I'm guessing that it's because of transient network issues on my monitoring server. I guess that setting up another monitoring server on a different network would greatly help, but how do I plug it into Nagios? Is it at all possible with Nagios or do I have to switch to another monitoring system? I like my configs and, if possible, I'd like to stay with Nagios or something compatible (Icinga?)

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• block access to certain website types

  - by frustrated teacher

  Need to block access to certain website types without listing each URL to block. Students at secondary school are going to porn sites. Need to be able to block all such access without having to list each possible site URL. Having the Content -- Ratings tab set to None for all categories on the ratings files listed on my computers does not prevent access. Unchecking users may access sites with no rating, even with the security settings set to High, still allows the porn sites to come up. If that is checked, then ONLY listed sites can open and students would not be able to do any research via google, for example. I would rather not have to continue checking each computer and blocking sites as they find them.

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• Taking over and Moving a PHP site

  - by KCavon

  I have a internal use PHP site at my new position. It only runs a few days a year off site so we keep it on laptops. The hardware it has been on, a 8 year IBM Thinkpad running Fedora, is dying. I have new Lenovo Thinkpad's running latest and greatest Ubuntu. I have copied the contents of var to a shared drive, renamed the old www folder in var on the new machine and copied over the old www folder. I can get to the login page and into the site, but when I look something up it returns Cannot Open. I know I cannot get to the MySQL in the new machine because users and passwords dont match. The version of the PHP from the old machine is before the setup script was included. I know very little about PHP. I am looking for input on the proper way to link the old PHP files to my mysql instance. Any help, much appreciated.

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• check_ssh executed from Nagios server returns "Server answer: ", nothing else

  - by phs

  Commmand works on the host I need to monitor (its IP is denoted as $HOSTADDRESS$ here): [root@host ~]# /usr/local/nagios/libexec/check_ssh localhost SSH OK - OpenSSH_4.3 (protocol 2.0) However, on the Nagios server, it does not: root@server:~# /usr/lib/nagios/plugins/check_ssh -H $HOSTADDRESS$ Server answer: I can see that the port is open: root@server:~# /usr/lib/nagios/plugins/check_tcp -H $HOSTADDRESS$ -p 22 TCP OK - 0.123 second response time on port 22|time=0.123277s;;;0.000000;10.000000 And I can verify with telnet: root@server:/etc/nagios3/conf.d# telnet $HOSTADDRESS$ 22 Trying $HOSTADDRESS$... Connected to $HOSTADDRESS$. Escape character is '^]'. After searching the web for two hours and trying different suggestions I am out of ideas. I have several other hosts with similar setup, and they don't have this problem. I have compared the configs and they look the same (I think). I am clearly missing something here.

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• What is a good web interface for remote linux load monitoring?

  - by Jakobud

  I'm looking for some type of remote linux monitoring software that you can view using a web interface. And I'm not just looking for the basic load information. I'm also looking for process information, similar to the info that you get from TOP. Like I'd just like to be able to pop open this webpage to view whats going on with the server at a moments notice. For example, perhaps just a basic PHP page that is on the server that uses basic AJAX to display and refresh results from the TOP command in the page. I was thinking about writing something like this, but I don't want to reinvent the wheel.

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• Can I save a session in Chrome?

  - by EmmyS

  Is there a way to save sessions in Chrome? I'm a longtime Firefox user, and am used to being able to save a session containing multiple tabs so I can go back to it at any time. I'm trying to switch over to Chrome, but without this ability it's not going to happen. I know that I can set the prefs to open the last-opened tabs at startup, but that's not really the same as true session management. I'm perfectly happy to install an extension to do this if one exists. (Not sure if this question belongs here or in superuser...)

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• MD5 and SHA1 checksum uses for downloading

  - by Zac

  I notice that when downloading a lot of open source tools (Eclipse, etc.) there are links for MD5 and SHA1 checksums, and didn't know what these were or what their purpose was. I know these are hashing algorithms, and I do understand hashing, so my only guess is that these are used for hashing some component of the download targets, and to compare them with "official" hash strings stored server-side. Perhaps that way it can be determined whether or not the targets have been modified from their correct version (for security and other purposes). Am I close or completely wrong, and if wrong, what are they?!?! Thanks!

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• Run shell command with variable in filename via Python

  - by rajitha

  I have files with naming convention st009_out.abc1.dat st009_out.abc2.dat st009_out.abc3.dat .................. .................. I am writing Python code where I want to use data from the file to perform a math function and need to extract the second column from the file. I have tried it this way: for k in range(1,10): file1=open('st009_out.abc'+str(k)+'.dat','r') ........... os.system("awk '{print $2}' st009_out.abc${k}.pmf > raj.dat") but this is not working as it is not taking the value of k in the shell command. How do I progress?

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• Firefox- How to change font size of items in bookmarks sidebar

  - by TheClamkinator

  In Windows. (I know I can open Desktop > Properties > Appearance > Advanced [and figure out which item determines it; probably Menu]. But, I don't want other things changed - just the bookmarks. This is because I have so many and I want more of them to display. I did see the question on changing font size of items in folder, on bookmarks toolbar, and sub-folders, etc; But, I'm talking sidebar on firefox, I don't have Google Chrome and I am not a developer.

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• HP DV5T laptop problems using Adobe in multiple monitors

  - by Rolnik

  I have a dualview arrangement of two monitors that works just fine for 90% of my applications. However, any time I open Adobe Acrobat Reader to the larger monitor, it fails to permit enlarging of the window to fill the entire screen. In other words, it seems Adobe crops the PDF view at about the size of the smaller of the two monitors, despite Acrobat being present in the larger monitor. I'm using nVideo graphics on the laptop, and connecting to the larger monitor through the docking port of a docking station. Any ideas how to get the Acrobat to be aware that it has more screen real-estate and use it fully?

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• load syntax as per file prefix

  - by Richo

  Firstly, I hope that this is the right place. I couldn't decide between here and superuser. My home directory lives in an svn repo. all my dotfiles are in version control so that I can track them across multiple machines, and they all source an unversioned .local (ie, .screenrc.local, .vimrc.local etc) which can override/make local changes to the environment in a machine specific way. The problem is that vim understands how I want to edit many of these config files, but loses it's mind when I open a .local, and honestly, I'm not really sure what it does to work out how to syntax highlight etc a file like .screenrc the pseudocode for what I'm after is: if OpenedFile.ends_with(".local") behave_as_per OpenedFile[0:-6] endif I hope this makes sense and hopefully someone can shed light on whether or not this is possible.

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• Why does Windows Explorer highlight only second entry?

  - by normanius

  Why does Windows Explorer highlight the second but never the first entry if I use the keyboard for navigation? Example: let's look at a folder that contains the following entries a1 a2 a3 b1 b2 If I hit 'a' on the keyboard, the explorer highlights entry 'a2' instead of 'a1'. It works fine for 'b' with 'b1' (because it's not the first entry). Similarly, if I open a folder and use the arrow-down key to navigate then the first entry is skipped again. Why?! It's probable that I'm too stupid for this but this "feature" really annoys me!

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• Audio input problem in Ubuntu 9.10

  - by Andrea Ambu

  My audio input is a mix of my mic output and my sound card output. I'd like it to be just my mic output. I was able to do so in Ubuntu 9.04 but the interface is 9.10 is totally changed and I tried every my creativity was able to think. It's really annoying when talking to other people over the internet because they keep hearing their voice back. I'm not sure I explained it in clear way so I'll give you an example: What I do: I put an mp3 on play or a video on youtube then open a recorder and start to talk on my mic. What happens: both my voice and audio from mp3/youtube get reordered, even if I put headphones volume to 0 (via hardware). What I'd like to happen: Only my voice should be recorded. I'm sure I'm missing some technical term, but that's the problem and I'd like to solve it in Ubuntu 9.10, any idea?

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• "Unknown user name or bad password" when I launch ADUC

  - by Chris

  When I open up Active Directory Users and Computers from my workstation, I receive an error: Naming information cannot be located because: Logon failure: unknown user name or bad password. Contact your system administrator to verify that your domain is properly configured and is currently online. If I log in to my workstation as somebody else, it works. If I log into a different workstation using my account, it works. All the workstations in question are running Windows Vista (32 and 64 bit) or Windows Server 2008. The domain controller in question is running Windows Small Business Server 2008. Everything else (that I tried) in the Remote Server Administration Tools runs just fine. Any thoughts? Edit: I just tried reinstalling RSAT. No such luck.

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• Outlook 2010 - Downloads same messages multiple times when opening

  - by AaronM

  I run multiple POP mailboxes, and have the 'Leave copy of messages on server' set for 20 days. I have been working like this for several years. However, I have just this week upgraded to Outlook 2010, and for some reason a couple of the mailboxes are downloading all the messages again, each time I open outlook. I have gone through all the settings but I can't see anything obvious, and apart from the upgrade to 2010, I havent touched any settings (2010 imported everything from 2007). I use webmail when away from my PC, hence why I leave a copy of emails on the server. Any ideas? It only downloads when Outlook first opens, thankfully not every time I do a send/receive.

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• How to reliably run a batch job every 5 seconds?

  - by Benjamin

  I'm building an application where the sending of all notifications (email, SMS, fax) will be asynchronous. The application will write the notifications to the database, and a batch job will read these notifications and send them with the appropriate transport. I was first reading at ways to run cron faster than the minute, and realized this was a bad idea. The batch scripts are written in PHP, and I guess that writing a proper daemon would be quite an overhead (though I'm open to any suggestion, as PHP car run indefinitely as well). What I have in mind is a solution that would: Run the PHP script every 5 seconds Check that the previous run has finished, or abort (never 2 concurrent batches running) Kill the script if live for more than x minutes (a security in case it hangs) Start with the system (if a reboot occurs) Any idea how to do this?

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• Windows (7 & Vista) laptop monitor does not come back after closing lid

  - by Scott Vercuski

  I'm experiencing an issue with Windows Vista (and now Windows 7) with my laptop. When I close the laptop lid the monitor goes blank but will not come back on after I re-open the laptop. The screen stays blank and nothing that I do will get it to come back. The laptop is an HP DV9000 series. Has anyone else ran into this issue? One of the solutions I've seen online is to go into the device manager and replace the lid driver with something nonsensical (the website suggested pointing the driver at the sound recorder). This does solve the problem by disabling the lid but doesn't really resolve the root issue. I'm asking if anyone has any method I can use to debug what's going on. How do I tell if it is an operating system issue vs. a malfunction within the lid itself. I'd actually like the lid to function as it's meant to. Thank you!

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• Are some .ogv/.ogv files possible to be corrupted, to make it not possible to loop?

  - by C15R

  I discovered by trial and error that my one .ogv video will not loop, but if I interchange a random .ogv video from wikipedia that one does loop, and they are both called .ogv. Why is this? Is the not-looping file corrupted? EDIT! I just had a breakthrough! I discovered if I view the webpage using my computer's version of the file (not-uploaded version), then it does loop! (I open index.html on my computer, and it is a relative URL) But! The version which is uploaded onto my web server does not loop. (I changed the relative URL to an absolute URL which points to the file on my server. I tried re-uploading it, but still does not loop. If someone has an answer to why this is and how I can fix it, I will be very grateful!

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• Log incoming requests on Ubuntu (ports 80, 443)

  - by Maxim Eliseev

  We have Tomcat running on Ubuntu server. It runs a web service, open to the internet. Sometimes it has a sudden spike of traffic and goes down. There is nothing unusual in Tomcat access logs. I guess it is because some of the requests are so 'heavy' that they never finish and hence are not recorded to Tomcat access logs. Is there a way to configure Ubuntu to log incoming requests in the following format (below)? Date, Time, URL (with query string params), IP address (of client) There should be one line per request. Each request should be logged before it is executed. Only incoming requests to ports 80 and 443 should be logged.

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• On Windows 7, how can I tell if a recording is multi-channel without third party tools?

  - by engineerchuan

  A customer has an audio that is confidential and can't send it to me. He also would not like to install other tools. He has a basic Windows 7 install. Is there any way to tell whether the recording is one channel or two channel? Normally, I would just get the audio and soxi it. Or, I would tell him to install Audacity or equivalent sound editor and open it up. I also thought that if you right clicked and looked at the size, bit rate, and length, you could get number of channels but bit rate already factors in number of channels. Sorry I'm not giving you a lot to work with.

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• Are there any ebook readers for Win 7 Pro which can display two books side-side?

  - by verve

  I'm trying to learn a language and I want to be able to open the English version of a book and the German one together on the screen to compare etc.I'm particularly interested in displaying Kindle-typebooks side-by-side. I need software that is simple to use and not-too-ugly looking. Ha. Aesthetics seem to matter to me when I'm learning...or, any reader that can display ANY popular ebook formats in parallel form will do! Win 7. IE 9. Freeware or not.

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• Setup local EC2 style cloud?

  - by John Kramlich

  I was recently given 3 dual opteron 2400 servers with 4GB of RAM and 120GB hard drives. I am interested in setting up something similar to Amazon's EC2 for my own personal web development use. Basically, I would like to spin up instances from an ISO or other disk images and have them available to test and develop software. Are there open source solutions I can use to accomplish this? I am assuming one of the machines will need to act as a controller of some sort for the other two. I use Sun's VirtualBox on my local development machine to virtualize various versions of Microsoft Windows. However, I'm not sure if that's the best tool for what I am trying to achieve. I apologize in advance if this question is to vague to get meaningful responses. I am new to cloud computing and fairly new at server administration.

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• How to debug old initd script under systemd?

  - by Gene Vincent

  I have an older initd script to start my application. It worked fine under older versions of SuSE, but fails on Open SuSE 12.3. The strange thing is cd /etc/init.d ; ./script start works fine. /etc/init.d/script start shows a redirection to systemctl, but doesn't start my application (and also doesn't show any output from the initd script). I don't see any log entries showing me what goes wrong. The only entry I see is in /var/log/messages saying the application was started. How do I debug this ?

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• Is there a way to automatically display the username on the Desktop background in Win7?

  - by Jonas

  We have computer used by multiple users running Win7. Unfortunately, people forget to log out, or they just use the session that is currently open, or they think that they're using their own session, but in the meantime, somebody else has logged on without logging out. To make it clear to people that they're using somebody else's session, I'd like to display the username of the person logged on (the one that's visible in the start menu) on the Desktop wallpaper; something like "John Doe's session". Is that possible?

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• Use teamviewer for running web server [closed]

  - by Steve

  I have a PC behind NAT. I want to host a web server on it which is accessible from the internet. I cannot open any blocked ports nor do i have admin rights on the computer. But it has a teamviewer client running on it 24*7 to which i do have access(no vpn installed). I can accesss this client from anywhere using teamviewer. I want to know if somehow i can use teamviewer to get a ip/hostname that is accessible from the internet and host a webserver. Also is it possible to get an ip if i get admin access but without opening ports.

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