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• Linux software raid robustness for raid1 vs other raid levels

  - by Waxhead

  I have a raid5 running and now also a raid1 that I set up yesterday. Since raid5 calculates parity it should be able to catch silent data corruption on one disk. However for raid1 the disks are just mirrors. The more I think about it I figure that raid1 is actually quite risky. Sure it will save me from a disk failure but i might not be as good when it comes to protecting the data on disk (who is actually more important for me). How does Linux software raid actually store raid1 type data on disk? How does it know what spindle is giving corrupt data (if the disk(subsystem) is not reporting any errors) If raid1 really is not giving me data protection but rather disk protection is there some tricks I can do with mdadm to create a two disk "raid5 like" setup? e.g. loose capacity but still keep redundancy also for data!?

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• Using optimization to assign by preference

  - by Aarthi

  I have 100 objects ("candies") that I need to distribute between five people so that each has an equal number of candies (in this case, 20 candies per person). However, each person has also expressed their preferences of candy to me in a chart, similar to below. Top-favored candies receive 10 points, least-favored candies receive -10 points, and neutral-favored candies receive 0.5 points. I need to sort the items out so that: Each person receives the same number of candies Each person's total "satisfaction" (points) is maximized My output is a list of each person's assigned items I'm familiar with Excel's in-house Monte Carlo simulation tools (Solver, F9 diceroll, etc) and would like to stick to those tools. While I know how to set up the chart, and how to use the column summation to input into Solver, I don't know how to get it to give me the desired output. Furthermore, how do I adjust the solver so it takes into account individual preferences rather than empirical ones? To wit: how do I begin setting up this model?

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• what might cause a print error in perl?

  - by Mark J Seger

  I have a long running script that every hour opens a file, prints to it and closes the file. I've recently found very rarely, the print is failing, not because I'm testing the status of the print itself but rather due to the fact of missing entries in the file until the system is actually rebooted! I do trap for file open failures and write a message to syslog when that happens and I'm not seeing any open failures so I'm now guessing it may be the print that is failing. I'm not trapping the print failures, which I suspect most people don't but am now going to update that one print. Meanwhile, my question is does anyone know what types of situations could cause a print statement to fail when there is plenty of disk storage and no contention for a file which has been successfully opened in append mode?

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• rsyslog from Heroku drain creates empty log files

  - by Jeff Lee

  I'm sending logs from my Heroku app to an rsyslog server, but the resulting log files seem to come up empty. The rsyslog configuration for receiving remote messages is as follows: $template RemoteDailyLog,"/var/log/remote/%hostname%/%$year%/%$month%/%$day%.log" :fromhost-ip, !isequal, "127.0.0.1" -?RemoteDailyLog & ~ My complete rsyslog configuration is available in this paste. This configuration appears to create the directories correctly. I see the Heroku app's logging hostname (of the form "d.xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx") appear in /var/log on the rsyslog host, which implies that log messages are successfully making it to the logging daemon, but the resulting logfiles are zero-size. I'm guessing the issue is with rsyslog, rather than Heroku, but I'm not sure where to look next.

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• SSH tunnel RDP through gateway server outside the network?

  - by Mike

  I need to access a PC via RDP that is behind a firewall. There's no way to connect to it directly that I know of. What I'd like to do is SSH from that remote PC to my home Ubuntu server, then connect to the remote PC using my home PC with the Ubuntu server as a gateway. I've tried SSH from remote PC to Ubuntu server, tunneling remote port 3389 to 127.0.0.1:3389, then SSH from home PC to Ubuntu server, tunneling local port 13389 to remote port 3389. At that point I try to RDP into: 127.0.0.1:13389, 127.0.0.2:13389, :3389 - no dice. I suppose I could simply set up an SSH server on my home PC and SSH from remote PC into home PC and then establish the tunnel that way, but I'd rather not go through the hassle of installing and configuring an ssh server on my home PC. I know LogMeIn would work here, but I don't want to go that route for various reasons. Any ideas? Thanks!

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• Linux bash: when to use egrep instead of grep?

  - by Michael Mao

  Hi all : I am preparing for a Linux terminal assessment now, I tried to Google and found most resources are referring to the basic "grep" rather than the more powerful "egrep" -- well, that is at least what the professor said in lecture. I am always working with small samples so performance tuning is a thing too far away. So basically I'd like to know are there any areas where I must switch to egrep to do it in a better way? Is it safe to work with basic "grep" as for now? will there be potential risks? Sorry about my limited knowledge on Linux shell commands, the man page looks like a maze to me and honestly I haven't put much time in understanding all the features both command provide.

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• Preparing Automatic Repair appears out of nowhere & takes forever?

  - by Jörg B.

  I shutdown my work machine (Windows 8.1 Pro) without any errors appearing (and without installing any new software and especially no new drivers the last couple days) yesterday evening, turned it on this morning and it automatically started into 'Preparing Automatic Repair' mode. 1st of - is there any way to get more information WHY this is appearing out of the blue and.. 2ndly, how long is this usually supposed to take? This is a rather beefy machine (Intel 3770k / 4 core 3.9ghz, Intel SSDs only and 32 gb of ram) but this screen has been 'loading' for almost 1.5 hours now. Is there any sort of debug/verbose mode that would give me ANY indication what's going on?

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• Network printer - Print direct or via shared printer on Server?

  - by NickC

  It has occurred to me that a workstation can connect to a printer in two ways: 1). Printing directly to the IP of the printer with the print driver installed locally. 2). Printing to a \Server\Printer1 share with the print queue residing on the server. Question is which way is preferred? I would assume that printing directly to a network printer rather than going through the server would be the most efficient from the point of view of network traffic. On the other hand I guess a server printer share would be easier to manage with the correct driver automatically being downloaded to the workstations. Also what about using GPP (Server2012) to install this printer on the workstations, does that require any specific way?

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• PKI Issuing CA on Domain Controllers

  - by dunxd

  I am setting up a PKI which will initially be used internally. As we may grow our use of this I have opted for a three tier hierarchy - Offline Root and Policy CAs (one Policy CA at the moment for internal use), and online issuing CAs. We had initially discussed using our Domain Controllers as the Issuing CAs rather than setting up dedicated ones. I am now starting to have doubts about whether it is a good idea to have our DCs do certificate issuing. We have less than 1000 users, so our DCs aren't hugely taxed. Does anyone have any suggestions for or against doing this? We are currently running Windows 2003 Active Directory, but will be upgrading to Windows 2008 in the coming year. I'm setting up Windows 2008 PKI.

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• changing timezone with dpkg-reconfigure tzdata and debconf-set-selections

  - by Carlos Campderrós

  I want to set up a script that automatically changes the timezone on a machine (running ubuntu 11.10) and also sets the right values to the debconf database. I've tried the following, but it does not work (at the end, the current timezone remains unchanged, and if I run manually the dpkg-reconfigure tzdata command, the selected values are indeed the old ones): #!/bin/sh -e echo "tzdata tzdata/Areas select Europe" | debconf-set-selections echo "tzdata tzdata/Zones/Europe select Madrid" | debconf-set-selections echo "tzdata tzdata/Zones/America select " | debconf-set-selections dpkg-reconfigure -f noninteractive tzdata So, by now, I'm doing it messing with the files /etc/localtime and /etc/timezone directly, but I'd rather prefer the dpkg-reconfigure and debconf way.

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• How to create a fully functional server of own? [closed]

  - by Saransh Sharma

  Hi i am looking for various companies for cloud hosting and servers dedicated one but i am not pleased with service being provided in our country and don't wanna opt to other country rather then India,well and also looking in cost factor too....so what i am looking is to create our own server which we can manage basically its like we would create a server or a machine or a pc and make it online and will use it as a server Problem is we need fully managed solution and we are not getting it anywhere and we are a startup looking to save and create something new in server so guys is it possible to create a server a webserver with home/dedsktop pc PLease help Saransh sharma

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• Sysprep on Windows 7 for a non-windows admin?

  - by askvictor

  I'm needing to use sysprep to deploy some Windows 7 machines. I can't find any resources that explain this very easily. In particular, I've loaded all of the programs I want for the image onto a computer. If I want to use prepares this for cloning onto 200 other machines, what steps would I need to take? Or do I need to start again, creating the image using 'audit' mode? The machines I'm using come pre-configured from the manufacturer with a host of custom drivers that wouldn't be fun to re-install - I'd rather use their base image to build upon. Cheers, Victor

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• What is the old AIX & RS/6000 console font?

  - by Xepoch

  I'm sick of Lucida Console font on my putty sessions. I used to love whatever font was employed on IBM rs/6000 consoles. Does anyone know the name of that font and if it is available (and usable) from anywhere? Sorry, I need to clarify the "consoles" to which I refer were not the serial consoles but rather smaller stand-alone X-Window systems. They could be setup without XDM and would start in text screen. I'm searching like crazy to find the actual machines I remember (there were hundreds of them at Uni) but I don't have the IBM #s in front of me. It looked amazingly similar to the PS/2 like this:

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• use of tcp_delack_min on redhat linux (kernel 2.6.18)

  - by user41466

  Hello, we're moving from Solaris to Redhat Linux, and trying to duplicate our low-latency setup, that, on solaris, includes the ndd settings related to TCP NO DELAY, and NAGLE ALGORITHM. I got the impression that those parameters are not all configurable system-wide, but still found some info. we have configured our applications to run with no nagle algorithm, but that is not sufficient. we have found an interesting RH article talking presenting the tcp_delack_min parameter, however, when browsing /proc/sys/net/ipv4/ , I can't find it there. would it be safe to assume that simply "adding" the parameter as it's said on the doc would be enough, or rather that the option is not supported by this version (would be strange, as RH specify that it "can be performed on a standard Red Hat Enterprise Linux installation") ? any other idea / recommendation to improve latency further ? thanks

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• Network architecture when using Rackspace's Cloud

  - by brianz

  I'm planning on launching a web application soon, and have decided on using Rackspace's Cloud offering with Debian. I'm not expecting that much traffic to start, but would rather get the architecture correct now even with the small VPSs. The thing I'm not quite sure about is how many VPSs I should get. At a minimum, I know I'll want three VPSs: Two Apache webservers One server for MySQL I'd also like: Nginx load balancer MySQL replication memcached I'm not sure where those last three processes should be running. Can the load balancer run on the same machine as the MySQL slave, or should they each run on their own machine? Does memcached run alongside the webservers or on different machines?

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• How to query a DHCP server to get the local DNS serves

  - by Dan Berlyoung

  I have a ClarkConnect (CentOS based) box running as my home router on a RR connection. I had the DNS servers set up to use Google's DNS server. I want to change them back to the local DNS servers but I can't find an obvious/easy way to get those address short of a)reconfiguring the router's network to DHCP them (would rather not interrupt everyone) or b)calling their T/S (kill me now!). Is there a command line tool/command I can use to query the DHCP server on the external NIC to see what DNS servers it would set me up with w/o munging my existing setup?

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• How do I identify which rewrite rule is being trigger on IIS 7.5?

  - by Jordan Reiter

  I have a set of rewrite rules (offhand, I would say around 40-50) for a given server. It's basically to handle and reroute mangled URLs so that bad links still go to where they're supposed to go. I've come across an URL that is redirecting and I can't figure out which rewrite rule it is applying. My background is Apache and in that case I'd simply enable a rewrite log and look at the logged output to figure out what was happening. Is there an equivalent way to do this in IIS? bonus round Any way for me to view & edit the rewrite rules in a text file rather than the GUI interface?

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• How to put Powerpoint viewer full screen on secondary display?

  - by Andrew Grimm

  Using Powerpoint viewer (2010), I want to show a Powerpoint show on my secondary display, i.e. the projector, not on my laptop screen. However, Powerpoint viewer always does full screen presentations on the primary display, even if I move the Powerpoint viewer program to the secondary display. Powerpoint and multiple monitors shows how to configure which display a Powerpoint presentation is shown on for the full version of Powerpoint. But how do I do this for Powerpoint viewer? One workaround is to clone monitors rather than having separate monitors displaying different things, but I'm still wondering if there's a better way.

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• CPanel - How to stop Apache from running as root user?

  - by ambu

  <?php echo `whoami`; ?> So this is returning 'root' and I don't know how to prevent it. I'm using WebHost Manager / CPanel which is supposed to create multiple users/vhosts and have Apache spawn it's process as that user/group. This isn't happening. If I login to WHM and open the PHP and SuExec Configuration section, my settings are: Default PHP Version (.php files) 5 PHP 5 Handler cgi PHP 4 Handler none Apache suEXEC on What's wrong? How can I get Apache to run as the correct user rather than root?

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• How to query a DHCP server to get the local DNS serves

  - by Dan Berlyoung

  I have a ClarkConnect (CentOS based) box running as my home router on a RR connection. I had the DNS servers set up to use Google's DNS server. I want to change them back to the local DNS servers but I can't find an obvious/easy way to get those address short of a)reconfiguring the router's network to DHCP them (would rather not interrupt everyone) or b)calling their T/S (kill me now!). Is there a command line tool/command I can use to query the DHCP server on the external NIC to see what DNS servers it would set me up with w/o munging my existing setup?

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• Windows 7 Computer Maintenance - Restore removed Desktop Shortcuts

  - by HaydnWVN

  I'm aware about the inbuilt nightmate 'tool' of Microsofts which is making every network administrators job a nightmare (if left turned on). In short it'll happily delete every desktop shortcut to a network resource. We have it disabled by default. My question is related to recovering these shortcuts, Windows doesn't seem to dump them into the Recycle Bin and although you can 'restore previous versions' of the Desktop folder, you are unable to do it with the user logged in... Rather a problem if you only have the 1 user account. We have a user who (although the 'Computer Maintenance' tool is turned off) had it come up in 'Action Centre' and chose to run it. I've been unable to reproduce it, but the tool has certainly run (and removed 24 shortcuts from her desktop) although it is still saying 'Windows is not checking your system for maintenance problems'. ?! Very fustrating! Any ideas if these shortcuts are backed up/moved elsewhere so i can easily find and restore them?

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• How to improve long text readability in Chrome?

  - by amiregelz

  I need to start reading The TCP/IP Guide. I have to admit that compared to other informative guides/tutorials/articles out there, this guide isn't so cluttered. However, I still find it a little bit hard to read, especially when reading for several hours. I don't know if it's the font, the contrast or the spacing, but this is why I've always preferred learning from books rather than from the internet. What can I do to make this guide more readable? I am reading it on Google Chrome.

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• Good translation (manually) software

  - by S.Hoekstra

  I'm looking for a good translation software. i do not mean something that does all the translation automatically for me. But rather something that aids me in translating large pieces of text, since it has to be a perfect translation i can't leave it to computers alone. Something like http://translate.google.com/toolkit but with more options/functions would be great. Preferably freeware ofcourse (But paid is not a problem). At the moment i use the Google toolkit since it's adequate for now, but i really need something more advanced. But looking for such software on google etc. is really hard because of the confusion with translation services and things like babelfish. Do you know any software like this? and maybe want to share your thoughts/experiences.

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• How do I keep Conditional Formatting formulas and ranges from automatically changing?

  - by Iszi

  I've found that Conditional Formatting formulas and ranges will automatically adjust when you copy, delete, or move data around in a spreadsheet. While this is a nice idea, it tends to break things for me in some rather weird ways. To avoid this, I tried writing rules that applied to the entire spreadsheet and keyed off of column headers to highlight the data I wanted to check. Example: =AND(A$1="Check This Column For Blanks),ISBLANK(A1)) applied to =$1:$1048576 However, even with the rule explicitly applied to the entire sheet, it was still automatically adjusting (and breaking in weird ways by doing so) as I worked in the sheet. How can I avoid this?

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• Redhat cluster Vs Pacemaker Vs Gluster Vs Sheepdog

  - by chandank

  Changing the entire question as earlier one was very confusing. I have been exploring different clustering system to run Virtual machines on two different machines on LAN with high availability. Currently I am already using DRBD resource on two different machines on Primary/Secondary mode. In case the primary fails I manually promote the secondary to Primary and start the VM. I also explored Gluster and looks good, however, I would rather prefer clustering over Gluster (user space FS). So if anyone has idea which one would be better from ease of use prospective please I would be interested in. Moreover, sheepdog project appears good, however, could not find much documentations/Howtos. I am using Centos 6.

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