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• Forward Request to Multiple Servers

  - by cactuarz

  We have 2 servers. One is old server and another is the new one. Currently we about doing a migration because the old server is not capable enough to handle everyday requests. The specs are: Old server Ubuntu 10.04 Nginx as Reverse Proxy Apache WSGI Python/Django New Server Ubuntu 10.04 Nginx Gunicorn Python/Django Celery+Redis Our manager asked us to research if the old server can perform multiple forwarding to all incoming request, for example, set Nginx of old server to forward all request to both old and new server. The purpose is to perform unit testing to new server using old server as comparer, see if the new server is ready to take over the role. Please help, if there is an idea, or must install some engine, or what we do is impossible. Many thanks.

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• Suggestions for making sysfs parameters persist across reboots

  - by ewwhite

  I'm experimenting with large changes to Linux system runtime parameters exposed through the sysfs virtual file system. What is the most efficient way to maintain these parameters so that they persist across reboots on a RHEL/CentOS-style system? Is it simply dumping commands into /etc/rc.local? Is there an init script that's well-suited for this? I'm also thinking about standardization from a configuration management perspective. Is there a clean sysfs equivalent to sysctl?

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• nginx not returning 304 on cached content

  - by Don H

  I'm using nginx as a reverse proxy with an Apache back-end handling some PHP files. The files return the right expiry headers and proxy_cache does a good job of caching them, but I've noticed that the cached content returns a 200 on every refresh, when it might be more efficient to return a 304 on the cached files. The files in question are generated by PHP. The urls do not have .php in them as they've been prettified. Any idea why nginx might not be returning 304 on repeated visits to a cached PHP output? To clarify: It's using proxy_cache for caching dynamic PHP pages (not static html pages generated by PHP). I'm setting expires headers in the PHP file of time + 24 hours. With that in mind, I was hoping nginx would be able to then return 304s on its cached versions during that 24 hour window.

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• Serial Port ttyUSB0

  - by Alex

  I picked up a USB serial null modem cable, so that I can connect up to a headless linux box. As a quick test, I plugged the device into the usb null modem, and the other end I connected to a windows pc. I opened up a terminal on the windows side, with 115200 8N1. On the linux side I opened minicom with the same params. MY problem is that I can type one way from the pc and see the text on the linux minicom side. If I type on the linux side it doesnt show on the pc side. If I reverse the cable it reverses the process. I bet this is a simple issue but I haven't dealt with serial comms in ages. Thanks

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• What hardware specs do I need to run Apache/PHP and SVN?

  - by John Isaacks

  I want to build a linux machine to use as a test server (LAMP) and use SVN on it. I am thinking maybe Ubantu as the OS but what hardware specs would I need. I think the entire site is less than a gig but if SVN is going to keep multiple versions than wouldnt I need a huge hard drive? Any tips would be nice. Thanks!!

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• Server rack recommendations

  - by Dan

  I'm putting servers on a rack for the first time, and am thinking a 4-post open frame rack is adequate for my needs. I'm putting in a few HP DL 385's and a few other things. What I'm wondering is if there's reason to be picky about the rack selection. I'm not concerned about heat or size - just installation and fit. Any recommendations or considerations?

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• Need help recovering a corrupt SQL database

  - by user570079

  I have a very special case that I have been working on for several days. I have a very large SQL Server 2008 database (about 2 TB) that contains 500 filegroups to support very large partitioned tables. Recently we had a catastophic failure on one of the drive and lost several filegroups and the database became in-accessible. We have been doing filegroup backups on a daily basis, but due to other issues, we lost our most recent backup of the log and the primary filegroup. We have all the data backed up but the primary filegroup backup is old. There have been no schema changes since the primary filegroup backup, but the lsn's are now all out of sync and we cannot recover the data. I have tried everything I could think of (and have tried just about every trick and hack I could google) but I still end up at the same point where I get messages saying that the files for filegroup x do not match the primary filegroup. I am now at the point of trying to edit the system tables (we have a separate temporary environment to do this so we are not worried about corrupting any production databases). I have tried updated sys.sysdbreg, sys.sysbrickfiles, and sys.sysprufiles to try to trick SQL into thinking all the files are online, but a "Select * From OPENROWSET(TABLE DBPROP, 5)" shows a different database state from what I see in sys.sysdbreg. I am now thinking I need to somehow edit the headers of the actual data files to try to line up the lsn's with the primary. I appreciate any help anyone can give me here, but please do not respond with things like "you are not supposed to do edit mdf, ndf files...." or "see msdn article....", etc. This is an advanced emergency case and I need a real hack so we can just get to the data in this corrupt database and export to a fresh new database. I know there is a way to do this, but not knowing what the DBPROP system functions does (i.e. does it look at system tables or does it actually open the file) is keeping me from trying to figure out how to fool SQL into allowing me to read these files. Thanks for any help.

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• Possible DVI Splitter Issues?

  - by Kurru

  Hi I am thinking about buying a DVI splitter cable online and a DVI- HDMI adapter. Can i use these to clone my monitors output so one can go to my monitor, and the other to my projector? Can anyone think of any issues with using the adapter like this? Would there be problems with signal lose or anything? Thanks

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• Virtual Box for everyday use?

  - by Mark

  I was just thinking about how nice virtual machines are...and how even "rebooting" is less painful, because at the very least, you don't have to wait for your physical computer to turn off and on with all the mobo shannanigans at the start... so, what if I ran everything in a virtual machine? Then I wouldn't really need a primary OS, I just need something than can run VirtualBox or what have you. So what's the lightest weight OS I could install, that supports a good virtual machine?

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• replace nth occurence of string in each line of a text file

  - by dnkb

  I have large text files with space delimited strings (2-5). The strings can contain "'" or "-". I'd like to replace say the second space with a pipe. What's the best way to go? Using sed I was thinking of this: sed -r 's/(^[a-z'-]+ [a-z'-]+\b) /\1|/' filename.txt Any other/better/simpler ideas? Thank you

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• 256MB VPS on XEN

  - by user63410

  I am thinking of getting a 256MB server on XEN but not sure is it capable of handling this setup: Varnish + Nginx + Eaccelerator + PHP-FM + MySQL + Mail/FTP? I've tried this setup on OpenVZ and it was partly disastorous, especially with varnish in the equation, i've heard that XEN is better at memory management, sometimes shaving off 50mb or more in comparison to OpenVZ setups... if anyone has any helpful suggestions / input please let me know thanks

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• How to combine data from two rows, when certain criteria is met

  - by Corde Parker

  I'm trying to make this Excel document but I want the AdminTimes for the same LastRxNo to be on the same line. So if the LastRxNo is the same, have one line and the AdminTime column will have multiple values. Here is a picture of what I want it to look like Any ideas? I was thinking an IF function, but I'm not too familiar with Excel to get it to work. It was just made in the Microsoft Query tool in Excel.

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• Do cheap color laserjets come with toner?

  - by jblocksom

  I'm thinking of getting a budget color laserjet. Will I need to buy four toner cartridges at the same time I get the printer, or do they come with starter toner cartridges? If there is toner with it, any idea how many pages I can get on what's in the box? The Samsung CL-315 or the HP Color LaserJet CP1215, both under $200, are good examples of the class of printer I'm looking at. Thanks!

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• Moving windows on Windows like on Gnome (Alt+DnD)?

  - by Alois Mahdal

  Is there a hidden setting or an external utility that would enable moving windows on Windows like on GNOME? I'm particularly thinking of moving windows using Alt + Drag and drop (which can be changed to Win + drag and drop). I have machine with Windows (7) and two big monitors at work, and I tend to use multiple smaller windows. Moving them quickly around is essential, so I'm always missing this GNOME feature.

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• Sending mail via Exchange, why am I being flagged as spam?

  - by Dan

  Exchange 2007 uses direct DNS for all outgoing mail. Mail that is sent from our public IP (1.2.3.4 - this is the IP of my mailserver) is delivered to the spam folders for providers such as Comcast and yahoo. Currently, our SPF looks like this: v=spf1 ip4:1.2.3.4 mx a:mail.domain.com ?all MX: mail.domain.com.(10) The reverse DNS entry on our ISP is mail.domain.com for our IP The banner HELO response from our server is <220 mail.domain.com Our IP address is NOT blacklisted anywhere, and the Cisco Senderbase gives us a score of Good What is the reason our mail doesn't look legit?

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• How to monitor nginx proxy cache?

  - by Isaac

  I would like to see which objects get cached by my nginx reverse proxy (with an apache as a backend). So far I could not find a way, only the info that its not implemented yet. The reason is that I would like to tweak my configuration for best performance without putting too much stress on the server, as the backend is a production system. I know benchmarking would be better, but its not an option right now. So I though an alternative measure would be to monitor the cache. Is that possible, and if yes, how? (despite patching nginx with the patch mentioned in the link above)

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• Configuring a monitor's constract/brightess/colours/etc

  - by DMA57361

  I have recently bought myself a new monitor, now I'd had my previous screen well over 5 years now so I'm looking at this one thinking the picture doesn't quite look right (not bad, just different). Rather than just wait until I'm used to the new picture I'd rather get it fine tuned, then get used to it - so I can reap the maximum benefit. So, can you please suggest reliable ways of configuring an LCD monitor's brightness/contrast/colour/etc to provide the optimum possibly quality image?

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• Is 5400 RPM HDDs sufficient for a File/Backup Server?

  - by wag2639

  I want to add a 1.5 - 2 TB hard drive to a Linux file and backup server we have in the office. Will it make a difference if I'm using 5400 RPM vs a 7200 RPM hard drive? I was thinking about getting a Western Digital Green Drive or Samsung Ecogreen or similar.

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• Are filesystem operations a function of the kernel?

  - by hydroparadise

  I suppose the question would be OS specific, so I'll take the following scenarios: Winodows (NTFS) OSX (HFS) Linux (ext2,ext3,ext4) Each operating system has it's default filesystem it operates os (OSX, I beleive, only has the one choice available). I've noticed some utilities out there for OS's to read different file systems (which obvisouly is NOT apart of the kernel), which got me thinking: Are filesystem operations a function of a driver (ie, potentially modular), or is it truly apart of the kernel?

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• Trying to build a history of popular laptop models

  - by John

  A requirement on a software project is it should run on typical business laptops up to X years old. However while given a specific model number I can normally find out when it was sold, I can't find data to do the reverse... for a given year I want to see what model numbers were released/discontinued. We're talking big-name, popular models like Dell Latitude/Precision/Vostro, Thinkpads, HP, etc. The data for any model is out there but getting a timeline is proving hard. Sites like Dell are (unsurprisingly) geared around current products, and even Wikipedia isn't proving very reliable. You'd think this data must have been collated by manufacturers or enthusiasts, surely?

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• Is possible to arbitrarily register names to the same public IP?

  - by Alex. S.

  I registered a domain, lets say mysite.com (for example), then, results that somebody else has an A record from anotheraddress.com pointing to the same IP address of mine (in a VPS in linode.com) What can I do to avoid this???, I mean, I would prefer reject accesses from anotheraddress.com to my site. I just know only by casualty putting my genuine domain name on this http://www.domaintools.com/reverse-ip/ My DNS server is name.com, and the DNS server pointing to the my public IP is from GoDaddy. Is possible to register arbitrarily names to the same public IP? Can I use my DNS record with mysite.com to point to 209.85.133.147 (google.com), for example?

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• "Raid 0 SAS" versus "2nd generation SSD"

  - by Stefano

  Hi everybody, i was planning to buy a SAS system made of two 15k RPM disks in Raid 0 configuration to give a boost to my s.o. and my apps... but after i saw that article on Coding Horror, i've started to thinking if a new 2nd generation SSD could do the same job, or even better... Does anybody have any information to help me decide?

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• Does VMWare Server run on a Windows 7 Host Machine?

  - by AieshaDot

  I'm currently running Vista Ultimate but I'm thinking about updating to Windows 7. Vista was not supported a host systems with VMWare Server (free version). Question: Does the latest version of the VMWare Server support Windows 7 has the host machine?

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• Change directory upwards to specified goal

  - by haakon

  I'm often deep inside a directory tree, moving upwards and downwards to perform various tasks. Is there anything more efficient than going 'cd ../../../..'? I was thinking something along the lines of this: If I'm in /foo/bar/baz/qux/quux/corge/grault and want to go to /foo/bar/baz, I want to do something like 'cdto baz'. I can write some bash script for this, but I'd first like to know if it already exists in some form.

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• Certificate Authentication

  - by Steve McCall

  I am currently working on deploying a website for staff to use remotely and would like to make sure it is secure. I was thinking would it be possible to set up some kind of certificate authentication where I would generate a certificate and install it on their laptop so they could access the website? I don't really want them to generate the certificates themselves though as that could easily go wrong. How easy / possible is this and how do I go about doing it?

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