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• LAMP Server without single failure point + Global Server Load Balancing?

  - by José Nobile

  I want implement a LAMP Server (Linux Apache MySQL PHP) without a single failure point and with Global Server Load Balancing. I have a server in Cali, Colombia, and other server will be installed in Melbourne, Australia, user in America can use the Cali Server and in Europe, Asia, Africa or Oceania use the Melbourne Server. If any server fail (or load is excessively high), a server must answer all request. Data in MYSQL must be in sync, php files, any configuration in both server must be in sync. I read about of Google DNS Server 8.8.8.8 and 8.8.4.4 and ANY Cast, also about MySQL semisynchronous replication and MySQL Cluster, but what about other things, as crontabs, and the configurations in server? The solution can't depend of APNIC or BGP, only open source software running in Linux.

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• Mac OS X Server mobile account VS Time Machine Network Backup

  - by elhombre

  I am installing a Server @home to manage the mac client's of my family. First I wanted to make time machine Backups over the internal network to an external Hard-drive which is connected to my Mac OS X Server (10.6) but when I read about the mobile accounts and it's synchronization features I got a little bit irritated what the differences between the two Services are. So where are the differences between a mobile account and a Time Machine Backup which is made over the network? Can the synchronized mobile Account be backup to an external Harddisk, if yes, how?

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• Missing disk space in Windows XP

  - by Jørn Schou-Rode

  On my mother's Lenovo laptop, Windows XP claims that the hard drive is almost full. According to the properties window, 52.7 out of 55.2 GB is in use: By deleting temp files from Internet Explorer, System Restore, Recycle bin, Windows Update, System Cleanup, I managed to free up about one GB. That's still 50 GB in use, which still is a lot more than I expected. Hence, I gave good old WinDirStat a spin, and here's the output: It might be hard to read here, but the first line says that the total amount of disk space in use on drive C is 24.3 GB. So Windows claims usage of 52.7 GB and WinDirStat can only account for 24.3 GB. Where is the other half of that disk space being used? I hope someone has an answer, or some tricks or tips to do further research. UPDATE: The laptop in question has an SSD hard drive. I am aware that these disk (at least the earlier ones) have a limited life-time. Could the symptoms described be caused by wear and tear on the SSD?

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• How can I improve performance over SMB/CIFS for an application that has poor write speeds?

  - by Jeremy

  I have a third party application that reads several large files and generates a third large file. Its performance is quite good when the generated file is stored on "local storage", i.e. either a direct attached or iSCSI-based disk. The source files that are read can be stored remotely on our NAS and accessed via SMB with little effect on performance. However, if we attempt to write the target file to any kind of SMB/CIFS share (Samba or Windows Server) the performance drops almost ten-fold. This is unacceptably slow in our case. Writing files to network shares is not otherwise slow. I can copy large files to SMB shares and get great performance - near what I would expect is possible given the disks and network in question. I have a theory that this application's problem with SMB shares has something to do with a lack of write caching over the share and perhaps lots of network roundtrips. Is this possible and is there anything that can be done about it?

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• Why change net.inet.tcp.tcbhashsize in FreeBSD?

  - by sh-beta

  In virtually every FreeBSD network tuning document I can find: # /boot/loader.conf net.inet.tcp.tcbhashsize=4096 This is usually paired with some unhelpful statement like "TCP control-block hash table tuning" or "Set this to a reasonable value." man 4 tcp isn't much help either: tcbhashsize Size of the TCP control-block hash table (read-only). This may be tuned using the kernel option TCBHASHSIZE or by setting net.inet.tcp.tcbhashsize in the loader(8). The only document I can find that touches on this mysterious thing is the Protocol Control Block Lookup subsection beneath Transport Layer in Optimizing the FreeBSD IP and TCP Stack, but its description is more about potential bottlenecks in using it. It seems tied to matching new TCP segments to their listening sockets, but I'm not sure how. What exactly is the TCP Control Block used for? Why would you want to set its hash size to 4096 or any other particular number?

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• What are the cheap CDN for Origin Pull?

  - by DucDigital

  I've read several thread around ServerFault about this, but still I am not satisfy with the answer so I post a question here. I need a Origin Pull CDN that support big file (more than 200MB). I don't need a storage place since they are too small, just to relay the server. Also the price should be afforable, ofcourse not more than 150$ a month for their smallest plan. I also need to pay by credit card since I do not work or stays in the US so it's hard for me to do a bank wire. Thank you very much

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• Is my HD broken? Can i use it for anything?

  - by acidzombie24

  Someone suggested formatting my HD so i wont try to read bad data. From what i understand the OS marks which clusters are bad and skips them. So after copying all my data i did a quick format to NTFS. I copied files with an error then i right clicked and tried to create a new folder. I was greeted by this message. I have 926 of 931gb free. Is my external HD broken?

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• Re-Calibrate Toshiba battery meter with Windows 7

  - by Farseeker

  Hi All. I have a Toshiba U300 laptop. Back in the olden days (circa-2000) you could re-calibrate the battery meter from the BIOS when your battery was no longer reading accurately. My battery was shot, so I bought a brand new one, however Windows 7 still seems to count down the battery life in at the same speed as the old one did. This time, when it alleged 0%, I turned the laptop back on and got another 90 minutes of life out of it, at 0%. Is there a tool or utility for Toshiba laptops that can fix it back to being accurate? I've read the other threads on SU about cycling the battery but that just doesn't seem to do it in this case. Update: After the last cycle, the battery meter now reads 100% but the indicator on the front of the laptop is still orange (indicating not fully charged)

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• Updating AFP version on Windows Server 2003

  - by Niclas Lindqvist

  Hi, We have a couple of Macs, running Leopard and Snow Leopard in our otherwise pure Windows environment. We cannot get file names longer than 31 characters and some times the file permissions gets scrabbled (users can't delete their own folders or access files they usually access). This only occurs when connecting through AFP, We've tried with SMB but it's horribly slow when working with larger documents, so it's not an option. I somewhere read about AFP 3.0 being the answer. So my question is: Is there some way of updating my "AFP version" on Windows Server 2003, or does anyone have a different idea of what might help to resolve this situation?

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• Remove postgres from Mac - installed in /usr/local/, can I just delete files?

  - by Richard

  I want to completely uninstall postgres and start from scratch - the version I have is refusing to work with PostGIS 2.0. I have read other answers on how to do this, but none of them seem to fit the way postgres is set up on this machine. I'm not sure postgres was originally installed on this machine - it wasn't via brew or Postgres.app or the EnterpriseDB installer - but it seems to be living in /usr/local: $ which psql /usr/local/pgsql-9.1/bin/psql The postgres binary itself is in /usr/local/var/postgres/. How can I kill it forever? Can I simply go to /usr/local and do rm -rf pgsql-9.1, and the same in /usr/local/var, and make sure there are no paths in my profile file? Or is there more to it than that? From memory I think I'll need to delete the database files too somehow. Thanks for the help.

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• Installed Java 7, but terminal still shows Java 6

  - by chipbk10

  I've installed Java 7 on my Mac (10.7.5), but in the terminal there is still java 6. java version "1.6.0_37" Java(TM) SE Runtime Environment (build 1.6.0_37-b06-434-11M3909) Java HotSpot(TM) 64-Bit Server VM (build 20.12-b01-434, mixed mode) There will be no problem with the version 6 on terminal, if I always got that errors when I tried to install a java application (LatexDraw): : CGContextGetCTM: invalid context 0x0 : CGContextSetBaseCTM: invalid context 0x0 : CGContextGetCTM: invalid context 0x0 : CGContextSetBaseCTM: invalid context 0x0 The problem is related to instability of java 6 inferred from this link I've read this installed-java-7-on-mac-osx-but-terminal-is-still-using-version-6 and also try to change my Java version by using export JAVA_HOME="/System/Library/Frameworks/JavaVM.framework/Versions/1.6.0/Home", but in my folder /System/Library/Frameworks/JavaVM.framework/Versions, there is no version 1.7, only versions under 1.6 ??? So, how can I fix this issue?

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• Allow different headers on different servers using WFF

  - by Brian

  We've got multiple web servers configured in a cluster using Microsoft's Web Farm Framework. One of the things I like to do to help debugging is to create a header in IIS that identifies the server that handled the request. Unfortunately when I try to do this, WFF sets the headers to the same value on all the servers. Is there a way around this? I tried looking into using skipDirectives, but I can't find any documentation on it (other than a little bit showing how to use it to skip directories and bindings). If there is documentation on this, please link to it! I would like to be able to read up more on it in case I need to do other things as well.

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• Want to add a new domain to my postfix, but mails not delivered (mail look back to myself)

  - by user74850

  Hi everybody, My host relay is working but I was aksed to add a new domain (like external.example.com). I have added in main.cf the new fqdn in relay_domains relay_domains = $mydestination, example.com,example2.com, externe.example.com and in transport example.com smtp:[192.168.1.22] example2.com smtp:[192.168.1.22] external.example.com smtp:[192.168.1.22] Mails sent to users with example.com and example2.com domain are well delivered. But for mails to external.example.com i got this message Mar 17 16:47:52 relayhost postfix/smtp[11948]: 754E1876A01: to=<[email protected]>, relay=relayhost2.example.com[80.81.82.83]:25, delay=19555, delays=19525/0.01/30/0, dsn=4.4.6, status=deferred (mail for external.example.com loops back to myself) I read another Q/A about the same issue right here, but it's not helping me. Can you ?

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• How can I get Windows 7 to remember program windows size and position?

  - by Ben

  I can open Outlook and it fills about half of the screen. I then maximize it to read some mail and then minimize it to do some other work. When I click on it again in the taskbar, it is back to the original size that it opened at. I have tried Ctrl-close and Ctrl-maximize but neither seems to work. This also happens with Explorer windows, AutoCAD, Revit, and other programs that I work with. Shouldn't a minimize and a maximize bring the window back to the last size and position?

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• How to swap ctrl and fn key on a MacBook Pro running Windows 7 via Boot Camp?

  - by hobbes3

  There are sooooo many discussion on the internet about swapping the fn and ctrl key on a MacBook Pro. On the Mac side, a new software called ReMap4MacBook does a perfect job swapping the two key. But on the PC side (specifically Windows 7), I can't really find a definitive answer. Most post refer to this article but I read the loooong article and followed the instructions to no avail. I remember there used to be a program (maybe it was on XP) that not only swapped the two keys but it also controlled the fans on the MacBook Pro. But I can't remember the name and I also recall that that program stopped being updated like years ago. EDIT: It's called Input Remapper. So I am hoping there exist a simple program that I can simply run to swap those two keys.

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• How do I SCP/FTP to a Coraid SR2421

  - by Pitto

  I need to save data to a Coraid SR2421. I am no expert and I'm trying to understand how this costy piece of hardware works. All I have is a Ethernet cable connecting my laptop and the coraid to a switch and the coraid's console with cursor blinking. Any kind of help would be greatly appreciated. edit and further explanation: I've tried using software on the coraid website but It's not working. So I've contacted the support and they sent me a file to upload on the coraid. It looks like if I upgrade coraid's firmware then I'll be able to use the coraid software on the windows side. That's why I'd need SCP/FTP or any kind of solution to copy a file in the partition that can be read from coraid console command line so I can launch the update command as requested. I hope I was a bit clearer now.

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• Is it possible to make Ctrl+C as responsive as Ctrl+Break in the Windows 7 console?

  - by Peter Graham

  Is it possible to make Ctrl+C act like Ctrl+Break in the Windows 7 cmd.exe console? By default Ctrl+C seems to only send a signal the next time the input buffer is read, where Ctrl+Break sends a signal immediately. This makes Ctrl+C useless for ending processes because when I want to end a process I want to end it immediately. I'm using Ctrl+Break for now but it's far harder to type. It looks like in DOS you can add BREAK=ON to CONFIG.SYS to achieve this, but not in Windows 7?

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• Windows 7 automatically rearranges the start menu

  - by Brice

  I've seen so many messages on how to rearrange the Windows Start Menu and none mentioning the real problem in doing so which has been around since XP at least. I go to ProgramData/Microsoft/Windows/Start Menu and have a day making everything the way I want. For one thing, their Maintenance menu, the Accessories menu and the Administrative Tools menu, I like to put under a Tools folder that I've created. And they seem to move OK. However, within a few hours, I see some of the shortcuts have been moved back or copied back and a new copy of these folders suddenly appears again on my Start Menu at the root. This is maddening and no one seems to even notice in all the tutorials I've read. Anyone know how to change this behavior?

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• File ownership and permissions on web site PHP files

  - by columbo

  Hello, I am learning the basics of linux servers so I am green. I have an Ubuntu server upon which there are websites that I have inherited. In a fit of security worry I decided to check out the ownership of the web site files. They are all 2016:sites. If I run the command 'cat /etc/group | more' I can see that the group exists. But when I run 'lastlog' the user 2016 does not appear. I started to worry that 2016 might be the username of web users connecting from the web so I set the permissions on a testfile to chmod 600, giving read permissions to only the file owner. Sure enough I could still access the file from the web. Can anyone suggest what is going on here? I tried creating a new user and giving them file ownership but then when I access the file from the web it wants me to have all directories up stream owned by the same person. Thanks

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• Can I "branch" VirtualBox snapshots (base multiple VM on the same disk image + separate diffs)?

  - by Thilo

  I keep multiple VirtualBoxes for different projects. They are all running the same Debian base system. Keeping complete copies of all the disk images is getting expensive. Is there a way that I can base multiple VM on the same (read-only) disk image, with (hopefully small) diffs layered on top? This is just like snapshots work, except that there is no concept of "current" and "previous", they are more like branches. Or can I just use snapshots (of the "same" VM) for this? I would be wanting to run more than one of those snapshots concurrently.

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• What RSS Reader can handle item-updating (JIRA search) feeds?

  - by Stephen

  Thunderbird is a good rss reader in terms of being able to connect successfully to jira authenticated search feeds (where evolution-rss and Liferea can't), but really sucks when it comes to updating. A Jira search feed will give a link id to http://jira/browse/[ticket no], and if that ticket/feed-item is updated, thunderbird refuses to update it - it already has it! (even though the item date does not match). Also, if you delete the ticket update, it will never show up again for that news account. Has anybody found an RSS reader that can work with JIRA/updating RSS items? Note: this is not the same as Jira activity feeds - those work great, as each update has a unique item id To replicate: Grab a search (any search) Get it into your rss reader Read an item, modify the linked ticket Update rss and see if the ticket bumps to most recent and unread or, generically: Get an rss feed (from your hard drive?) Modify an item in the middle changing the content, the date, and moving it to the top Update rss and see if the ticket bumps to most recent and unread

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• securing unpatched websites

  - by neuron

  I have a client with a lot (read several thousand) websites in several old cms solutions that are no longer maintained. Now moving all of them to a maintained solution isn't really an option at this point. So I'm thinking about ways to secure the solutions without patching them. The solutions are mostly joomla 1.0/1.5 and wordpress. What I'm thinking is something like this: mod_suexec to lock everyone into their own home directory apparmor to deny any and all file writes by default. (exclude by default, include things like "images" directories). use htaccess to prevent anything in writable directories from being executed. (aka disable php_engine for images/ directory). mysql triggers to check the "users" tables to prevent adding new admins/superadmins. Does this make sense? Is it viable? Am I missing something obvious?

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• How do I create a guest ftp user and give access to specific sub-folder with SSH?

  - by gourav

  I just got a virtual dedicated server at GoDaddy. I got the Simple Control Panel. There doesn't seem to be a way to create a guest ftp user through this control panel and I was told it must be created through SSH. I have a program called Putty which can log into the server via SSH. I'm familiar with logging in but does anyone know what the commands are to be used to create a guest ftp user and give them Read and Write access to a particular folder? Regards gourav

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• How can I keep websites from knowing where I live?

  - by D Connors

  This questions is related to issues and practicality, not security. I live in Brazil and, apparently, every single website I visit knows about it. Usually that's ok, but there are quite a few sites that don't make use of that information adequately. For instance: Bing keeps thinking that brazilian pages are way more relevant to me than american ones (which they're not). Google.com always redirects me to google.com.br. Microsoft automatically sends me to horribly translated support pages in portuguese (which would just be easier to read in english). These are just a few examples. Usually it's stuff I can live with (or work around), but some of them are just plain irritating. I have geolocation disabled in firefox, so I guess they're either getting this information from my IP or from windows itself (which I bought here). Is there a way to avoid this? Either tell them nothing or make them think I live somewhere else? Thanks

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• MPlayer refuses to generate mono wav file

  - by JCCyC

  I want to downsample an existing audio file to 8KHz mono. This command line downsamples it to stereo: mplayer -quiet -vo null -vc dummy -af volume=0,resample=8000:0:1 -ao pcm:waveheader:file="/tmp/blah1.wav" ~/from_my_cellphone.3ga It generates a file that the file utility identifies as stereo: $ file /tmp/blah1.wav /tmp/blah1.wav: RIFF (little-endian) data, WAVE audio, Microsoft PCM, 16 bit, stereo 8000 Hz Now, if I read the documentation correctly, I should add pan=1:0.5:0.5 so I get a file that's half the size: mplayer -quiet -vo null -vc dummy -af volume=0,resample=8000:0:1:pan=1:0.5:0.5 -ao pcm:waveheader:file="/tmp/blah2.wav" ~/from_my_cellphone.3ga But it doesn't! blah2.wav is identical to blah1.wav! What am I doing wrong?

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