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• Google account gives ERR_SSL_BAD_RECORD_MAC_ALERT errors

  - by Kjensen

  A couple of days ago, I started being unable to connect to accounts.google.com, which handles logins to all kinds of google services. I get this error in Chrome: Error 126 (net::ERR_SSL_BAD_RECORD_MAC_ALERT): Unknown error. In IE I get this: I assume it is the same error, just wrapped up. I run Win8 RTM. On the SAME machine, using the same network card, in a VMWare workstation image running Win7, I am able to connect perfectly. On another of my machines on my network, I am also still able to connect with no problem. My girlfriend uses the same network and has also complained a couple of times about this error (google calendar) - but this is anecdotal, since her technical troubleshooting abilities stop at "xxxx is broken". Her machine runs Win7. ;) I have rebooted, cleared cookies, do not run any antivirus/firewall, have not changed network config. The first 3-4 days after installing Win8, I did not have any problems. I have also searched, and found a hint about enabling SSL2.0 in connection settings, which did not help. Anybody know something about this error and what I can do to fix it?

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• Using virtualization infrastructure for J2EE application distribution- viable alternative?

  - by Dan

  Our company builds custom J2EE web solutions. At the moment, we use standard J2EE distribution mechanisms (ear/war archives). Application servers are generally administered by our clients' IT departments and since we do not have complete control over the environment, a lot of entropy can be introduced into the solution. For example: latest app. server patch not applied conflicting third party libraries inside the app. server root server runtime and tuning parameters not configured (for example, number of connections in database pool) We are looking into using virtualization infrastructure for J2EE application distribution. Instead of sending the ear/war archive, we’d send image with application server node and our application preinstalled. Some of the benefits are same as using with using virtualization infrastructure in general, namely better use of hardware resources. For us, it reduces the entropy of hosting infrastructure - distributing VM should be less affected by hosting environment. So far, the downside I see can be in application server licenses, here they will have to use dedicated servers for our solution, but this is generally already done that way. Also, there is a complexity with maintaining virtualization infrastructure, but this is often something IT departments have more experience with than with administering and fine-tuning J2EE solutions. Anyone has experience with this model? What are the downsides? Will we not just replace one type of complexity with other?

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• What file transfer protocols can be used for PXE booting besides TFTP?

  - by Stefan Lasiewski

  According to ISC's dhcpd manpage: The filename statement filename "filename"; The filename statement can be used to specify the name of the initial boot file which is to be loaded by a client. The filename should be a filename recognizable to whatever file transfer protocol the client can be expected to use to load the file. My questions are: What file transfer protocols, besides tftp, are available to load the file (e.g. What protocols "can be expected to" load the file)? How can I tell? Can I see a list of these protocols? Does my choice of DHCP server influence which file transfer protocols are in use? Pretend I want to use dnsmasq instead of ISC's dhcpd Are these features dependent on the PXE which is in use (e.g. My Intel NICs use an Intel ROM)? I know that some PXE-variants, such as iPXE/gPXE/Etherboot, can also load files over HTTP. However, the PXE rom needs to be replaced with the iPXE image, either by chainloading or by burning the PXE rom onto the NIC. For example, the iPXE Howto "Using ISC dhcpd" says: ISC dhcpd is configured using the file /etc/dhcpd.conf. You can instruct iPXE to boot using the filename directive: filename "pxelinux.0"; or filename "http://boot.ipxe.org/demo/boot.php";

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• Screen Flickering: Hardware or Software?

  - by Wesley

  I have a Samsung N120 netbook (upgraded to 2GB DDR2 RAM) and there has been a screen flickering issue for some time now. However, I have not been able to accurately determine whether it is a software or hardware issue. Here are some of the symptoms: The flicker is white-colored and shows up as vertical lines. Flickering or not, there may be occasionally some random blue patterns (no image distortion) The screen tends to flicker more when the screen is not tilted back all the way. When tilting the screen back and forth, the screen will usually flicker. Some images on the screen may randomly distort without full-on flickering. The screen will flicker only on certain websites, but not on others. A certain part of a webpage may constantly be distorted randomly, even when scrolling. While flickering, the mouse will not move though I'm moving my finger along the touchpad. A connected external monitor does not have any problems. The flickering is completely random and does not seem to follow any CPU/GPU usage trends. Flickering usually gets worse when the screen brightness is turned higher. There will be flickering on battery and while plugged in. Search up "Samsung N120 - Screen Flickering" on YouTube for an idea of what the flickering looks like. However, there is no visible distortions and the flickering seems to stop when the screen has dimmed. Since the problems started, I tried formatting and using Windows 7, then formatted again and went back to Windows XP. The screen was also replaced sometime during this past summer. The uninstallation of the Samsung Battery Manager (on the original install of XP) seemed to reduce the flicker partially, but eventually got worse. So, what could possibly be the problem?

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• Can't create new Volume on Unallocated Space

  - by natediggs

  I installed Windows Server 2008 R2 on a Dell server that has one volume that is a 6 TB RAID 5 array. I created a 120GB install volume and I'm now trying to create a 5 TB data volume. For what ever reason Windows will not allow me to create a new volume out of all of the unalocated space. Windows will allow me to create a new volume out of one 2TB block of unallocated space but not the remaining 3.5 TB block. Tried to post a screen shot but I was blocked. If I right click on the 1949.85 GB block of space there is the option to create a new volume. If I click on the 3539.5 GB block of space that option is grayed out. If I go into diskpart and try to create a new partition, diskpart says that there is only 1949GBs free on the volume. I know this process works because I did the exact same thing on another server that we have that is the exact same hardware configuration on which I used the exact same Server 2008 R2 install image. Any help would be greatly appreciated. Nate

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• Can I take my ReadyNAS drive in Raid1 and plug it straight into new different machine?

  - by jacko

  I would assume that I can just take my HDD out of my NAS (in raid1 mirror) and plug it into another enclosure and have it work off the bat but I'd like to make sure... Any ideas? Edit: My current setup is a Netgear ReadyNAS in (hardware) raid1. I'm hoping to replace this with a home theatre type PC (possibly running Ubuntu), and would like to migrate my data without having to do a bulk transfer over my network between the 2 machines. Can anyone confirm the case for the Netgear ReadyNAS? Edit: Ok after further reading it seems that the ReadyNAS Duo formats my drive as ext3 in 16k blocks. There are instructions for mounting a drive into a linux box here: Mounting Sparc-based ReadyNAS Drives in x86-based Linux There is also talk about a linux image here: ReadyNAS Data Recovery - VMware recovery tool I'm not sure whether this means they ReadyNAS actually implements software raid under the hood, or what? So it appears like it IS do-able, but do any of you linux guru's know whether this is viable and whether the fact that they are in raid 1 affect matters?

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• Is there a free PDF printer / distiller that creates signable documents?

  - by Coderer

  I've used various methods (mentioned elsewhere on this site) to create PDFs, using a printer driver or converting from PostScript, etc. The common problem is that if I open any of the output files in the newer versions of Adobe Reader, there's an option to "Place Signature" but it's greyed out, or gives an error message that the feature has been disabled for this document. As far as I can tell, there's an option set somewhere in the document metadata that tells Reader "allow the user to sign this document", or don't. None of the free/open source tools that have been been linked to in other SU posts have had this listed as an option (though to be fair I haven't actually downloaded and tried all of them). Is there a tool that does this? Can I just poke a bit with a hex editor somewhere to turn on this functionality? I can sometimes get access to Acrobat Professional to turn on this option, but doing it for every desired case would be more work than I care to do. The current workaround for single-page documents is: Print the document to PDF (possibly via postscript) Open a single-page blank PDF with the "signable" bit turned on in Reader create a custom "stamp" using the Reader markup tools, by importing the printed-to document "stamp" an image of the printed document on the blank page, hoping to get it centered about right place a signature over the document-but-not-really you just stamped This obviously does not scale well at all. It would be much better if I could: Print the document to PDF Drag the document to a simple shortcut / tool / whatever Open the document in Reader Place a signature in the document ETA: Sorry, maybe I should have been clearer -- I'm talking about the certificate-based digital signing available in Adobe Reader, not adding a virtual ink signature. Also, any solution really would have to be available offline.

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• Computer Freezes with "Bugcheck 0" on Windows 7. How do I figure out why?

  - by George Stocker

  After about 10 minutes of running, my computer will hang, exhibiting the following symptoms: Both monitors act as if there is no image being sent to them (on, but blacked out) The CAPS Lock key on the keyboard will not respond. The computer appears to still be running: CPU Fan is whirring. When I reboot, Windows says "The previous shutdown was unexpected." I've enabled the 'don't automatically restart' on an error, and asked the computer to make a memory dump whenever it crashes, but it hasn't done either. The problem is that there's no bugcheck for me to go off of, so there's no way for me to determine what the cause is (I think). Here are my system specs: Intel Core 2 Duo E6750 Gigabyte P35C-DS3R w/ 4.00 GB (DDR2 Ram) Nvidia 8800 GT Windows 7 I've tried running the Windows Memory checker, but the system also freezes when using that after about 10 minutes as well. How can I diagnose the problem with no bugcheck and no ability to run a memory checker? Update Running Memtest86 also causes the computer to crash (looks like it doesn't make it through a full pass - it was only running for about 10 minutes when the PC stopped responding).

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• Fix bad superblock on logical partition

  - by Chris

  I was following http://www.howtoforge.com/linux_resi...xt3_partitions and when i reboot and run: root@Microknoppix:/home/knoppix# fsck -n /dev/sda7 fsck from util-linux-ng 2.17.2 e2fsck 1.41.12 (17-May-2010) fsck.ext2: Superblock invalid, trying backup blocks... fsck.ext2: Bad magic number in super-block while trying to open /dev/sda7 The superblock could not be read or does not describe a correct ext2 filesystem. If the device is valid and it really contains an ext2 filesystem (and not swap or ufs or something else), then the superblock is corrupt, and you might try running e2fsck with an alternate superblock: e2fsck -b 8193 <device> so i ran e2fsck with all the block numbers that you need (forget exactly what tool i used to find where the superblocks are hidden) no dice then i ran testdisk and had it look for the superblock, no results anyone have any ideas? fdisk -l for reference: root@Microknoppix:/home/knoppix# fdisk -l Disk /dev/sda: 320.1 GB, 320072933376 bytes 255 heads, 63 sectors/track, 38913 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x97646c29 Device Boot Start End Blocks Id System /dev/sda1 1 64 512000 83 Linux Partition 1 does not end on cylinder boundary. /dev/sda2 64 38912 312046593 f W95 Ext'd (LBA) /dev/sda5 64 326 2104320 82 Linux swap / Solaris /dev/sda6 * 327 2938 20972544 83 Linux /dev/sda7 2938 38912 288968672+ 83 Linux To be honest it looks like I lost it... Next step if that happens is to dump the partition to an image file and hope i can find or write some software to parse through the data looking for known file headers, i think.

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• Cisco 3560+ipservices -- IGMP snooping issue with TTL=1

  - by Jander

  I've got a C3560 with Enhanced (IPSERVICES) image, routing multicast between its VLANs with no external multicast router. It's serving a test environment where developers may generate multicast traffic on arbitrary addresses. Everything is working fine except when someone sends out multicast traffic with TTL=1, in which case the multicast packet suppression fails and the traffic is broadcast to all members of the VLAN. It looks to me like because the TTL is 1, the multicast routing subsystem doesn't see the packets, so it doesn't create a mroute table entry. If I send out packets with TTL=2 briefly, then switch to TTL=1 packets, they are filtered correctly until the mroute entry expires. My question: is there some trick to getting the switch to filter the TTL=1 packets, or am I out of luck? Below are the relevant parts of the config, with a representative VLAN interface. I can provide more info as needed. #show run ... ip routing ip multicast-routing distributed no ip igmp snooping report-suppression ! interface Vlan44 ip address 172.23.44.1 255.255.255.0 no ip proxy-arp ip pim passive ... #show ip igmp snooping vlan 44 Global IGMP Snooping configuration: ------------------------------------------- IGMP snooping : Enabled IGMPv3 snooping (minimal) : Enabled Report suppression : Disabled TCN solicit query : Disabled TCN flood query count : 2 Robustness variable : 2 Last member query count : 2 Last member query interval : 1000 Vlan 44: -------- IGMP snooping : Enabled IGMPv2 immediate leave : Disabled Multicast router learning mode : pim-dvmrp CGMP interoperability mode : IGMP_ONLY Robustness variable : 2 Last member query count : 2 Last member query interval : 1000

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• How to install a desktop environment onto Ubuntu Server -- but without internet access or a CDROM?

  - by James

  I am playing around with a computer which has no CDROM drive or internet access and I have installed Ubuntu Server onto it. I have that all up and running nicely but now I'd like to install Xfce, GNOME or something similar so I can load up a desktop environment from the command line if I wish. Obviously with internet access or a CDROM, this would be a simple task of using apt-get and it finding & retrieving the packages for me, I assume, but I do not have either. I do however have a USB drive and I have used Unetbootin to make it into a bootable drive with the Ubuntu Server disk image files on there. I have mounted the USB drive to /media/usb0 and tried the command "sudo apt-cdrom add -d /media/usb0" to get apt to recognise the USb drive as an "Ubuntu CD" -- a source of package files but apt-get doesn't seem to be finding Xfce.. I try "sudo apt-get install xfce" and "sudo apt-get install xfce4" but neither find the package.. I would prefer to have Xfce but GNOME would be OK too.. My question is, am I doing something wrong? I figured that the Ubuntu Server disk (or rather, my Ubuntu Server USB drive) might not have any desktop environment packages on there so I tried the Xubuntu Desktop disk too (again, from my USB drive). I tried "sudo apt-get install xubuntu-desktop" but it couldn't find the package - even though it is listed under the /casper/ directory in some MANIFEST file. Anyone see where I'm going wrong? Maybe apt-get install is looking somewhere other than my USB drive? Maybe my commands are wrong? Maybe the disks don't even have the desktop environments on!? Thanks in advance guys, any input would be much appreciated. Cheers - James

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• Install VirtualBox on Ubuntu 12.04.1 (on [Samsung] Chromebook)

  - by iphonedev7

  I have dual booted Ubuntu Linux 12.04.1 LTS on my Samsung Series 5 ChromeBook, and am trying to run/install Oracle VirtualBox (from the generic .run file downloaded from their website). However, every time I try to run it (as root from the command line), it gives me the following error occurs: Please install the build and header files for your current Linux kernel. The current kernel version is 3.4.0 Problems were found which would prevent VirtualBox from installing. I have tried the version from the Software Center, as well as the command line installation, both of which gave me errors based on my linux-headers/linux-kernel/linux-[kernel]-image. Here's an error I keep getting (on the command line): First Installation: checking all kernels... It is likely that 3.4.0 belongs to a chroot's host Building only for 3.5.0-18-generic Building initial module for 3.5.0-18-generic ERROR (dkms apport): kernel package linux-headers-3.5.0-18-generic is not supported Error! Bad return status for module build on kernel: 3.5.0-18-generic (x86_64) Consult /var/lib/dkms/virtualbox/4.1.12/build/make.log for more information. Setting up virtualbox-qt (4.1.12-dfsg-2ubuntu0.2) ... Processing triggers for libc-bin ... ldconfig deferred processing now taking place ...And one of the more cryptic errors I get when trying to start any Virtual Machine: Result Code: NS_ERROR_FAILURE (0x80004005) Component: Machine Interface: IMachine {5eaa9319-62fc-4b0a-843c-0cb1940f8a91}

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• EXCEL workbook, intermitently, takes 30 seconds to load

  - by Julio Nobre

  I am trying to figure out why a simple .XLS EXCEL workbook is taking, randomly, 30 seconds to open. Before answering: Please, bear mind the following: Problem symptoms Hanging is intermitent and it takes exactly 30 seconds; During hanging there is no cpu or disk activity; It only happens during workbook load. Every runs smooth after that; Windows Explorer.exe hangs on folder, but all other folders, system and applications are still responsive; There are no consecutive hangings. I have to wait for while to reproduce this behaviour; All workbooks where located on a local drive (C:\BPI); The workbook has no macros and no addins; Office 2003 is being used for several years; The computer is running Windows XP; Computer has several network mapped drives, all addressed to main file server; Recently, main fileserver was replaced by Windows 2011 SBS Standard Edition What I have done so far I have traced machine Explorer.exe, using Process Monitor, added Duration column, and filtered by Duration 1. That's is how I found that hanging was taking exactly 30 seconds. For further information, please refer to Oliver Salzburg tutorial. Using Process Monitor, I have also figured out than five operations were taking most of sample collecting duration. Looking at sample image below, column Operation below you will notice that one single operation was taking 29 seconds; I have tried different workbooks (all of them smaller than 30 KB); I have, temporarily, removed all shortcuts on User Document's folder that were pointing to network drives or shares; I have runned CCleaner to fix registry issues; I made sure that there were no external links on tested workbooks; I have reproduced this behaviour for hours; I have extensivelly researched for hours on the web; Process Monitor's collected and filtered data

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• Windows 7 BSOD when changing power plan

  - by dd5

  i have a strange problem. When i want to change the power plan on my laptop from High performance to Balanced, Windows freezes and i get bsod. The power plan settings are all default. Laptop specs: - Intel Core i3 330M/350M - Intel® HM55 Express Chipset - DDR3 1066 MHz SDRAM 8GB - ATI Mobility™ Radeon HD5730 1GB DDR3 VRAM - Intel SSD330 128gb - Windows 7 Home premium I've searched the internets but couldnt find a similar issue. BSOD first started when i installed this SSD and stopped when i've updated the chipset controller driver then started again yesterday when i wanted to change the power settings plan.Minidump file here. Any help with this weird issue appriciated, thanks. Edit: - i've ran Memory diagnostic tool, - Intel SSD diagnostics - and updated the firmware to 3.2.1. Non of these steps worked or shown signs of errors - but still got BSOD when changing power plan settings. After analizing the dump file via osronline.com here a first few lines: CRITICAL_OBJECT_TERMINATION (f4) A process or thread crucial to system operation has unexpectedly exited or been terminated. Several processes and threads are necessary for the operation of the system; when they are terminated (for any reason), the system can no longer function. Arguments: Arg1: 0000000000000003, Process Arg2: fffffa8008661b30, Terminating object Arg3: fffffa8008661e10, Process image file name Arg4: fffff800033de270, Explanatory message (ascii) -- Solution -- Provided by Vinayak: After installing the Intel Rapid storage Technology from MajorGeeks, i didn't experience a BSOD since, thank you :)

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• Restoring Windows 2008 Server X86 and X64

  - by rihatum

  Restoring Windows 2008 Server (Domain Controller) We are using Backup Exec System Recovery 2010 to Image our DC. Now this software has a feature to convert the backup into a vmware or hyper-v VM I have also used disk2vhd to convert one of our dc's to a vhd and when I connected it into Hyper-V, it booted fine, I can login - BUT :-) As soon as I login, I get the activation error, that change product key, this product key isn't good for this machine etc. Question is : When in a real recovery situation, what would be the procedure to restore it either virtual or onto a physical box but be able to login and change product key etc ? In this scenario its just locked down and I cant' do anything, if this is the case, how would I replicate my production environment via these tools ? Any Ideas ? Will be grateful for some real world examples here. Same thing happens with our exchange backup / test restore either physical or virtual, can login but nothing else. Now we don't have the keys as they are OEM keys and just wondering what will happen in a real scenario, would we be purchasing another KEY or using the OEM key on our new server ? This is a test environment I am trying to create by restoring our backups either into hyper-v or physical test machines. Also, If I build up a machine (Server 2008) in a VM (Hyper-V), How can I restore just the system state backup of my DC into it ? will that give me the activation error too ? even though I would use the TRIAL ISOs provided by Microsoft ? Kind regards

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• Desktop Provisioning for a Small Linux Software Development Team

  - by deakblue

  Goal: Get a small team using a standard development image rather than 4 software devs setting up their own environments. Why: it takes a day or days to install a distro, build-specific libraries, tools like editors and IDEs, mysql, couchdb, java, maven, python, android-sdk, etc. It's a giant PITA that when repeated 4 times by 4 developers (not sys admins) wastes time and generates annoying divergences that crop up later (it-builds-on-my-box syndrome). There's no sharing of productivity, settings, tricks, scripts, set-ups. Some of this is helped by segregating the build systems into headless virtualbox images. This doesn't really address tooling though or the GUI-desktop dev that needs doing. So I see three basic strategies, ghosting, virtualization, and finally creating a kind of in-house linux distro (I guess Google does something like this). The target dev environment is based on Debian OpenBox and must allow a mix of 3rd gen Core i7 notebooks 8GB-minimum to work both single and multihead. Important, the lappies are not the same, but a mix of 2012 macbooks and PCs. So: virtualization: is doing all of your work within a VM, like VirtualBox, practical on this hardware or annoying. ghosting: will laptops from different manufacturers make this impractical. DIY distro: short of scripting a bunch of package installs, I don't know if there's any "distro-maker" that could keep this from being an epic project of scripting package installs. So any advice?

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• How to clone a HDD and then use the clone with VMware (so that Windows works!)?

  - by Ahmad

  I have a system on which Windows 7 is installed, and I am trying to make a clone of its HDD image, which I then want to use in my main PC with VMware, so that I can boot Windows 7 off the cloned HDD. I used Ultimate Boot CD v5.1.1 with the system whose HDD I wanted to clone, and I cloned it using EaseUs Disk Copy, which comes with Ultimate Boot CD. The source HDD was 250 GB in size which had 3 partitions, while the USB HDD I attached to the system, which was supposed to be the destination/clone HDD, was 320 GB in size. I chose to create an exact replica, and so 250 GB worth of data (partitions, etc.) was copied exactly, and the rest of the space was un-allocated. I now connected this USB HDD to my main PC, fired up VMware Workstation 8 and defined a new Virtual Machine, and chose to boot off the USB HDD. Result is that when Windows is booting (from the cloned HDD inside VMware), I get the blue screen error before I reach the login screen. How can I change my methodology so that Windows even boots from the clone? I can change any tools I use, etc.

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• raid 0 data recovery?

  - by Fred

  HI All, I have two identical seagate 7200.9 500Gb drives confiured as a RAID 0 spanned disk in windows. One of the drives has lost power and wont spin up at all. I know this normally means death for the data on both drives but i have a cunning plan.. DISK 1 - NO POWER RAID 0 DISK DISK 2 - FULLY FUNCTIONAL RAID 0 DISK DISK 3 - FULLY FUNCTIONAL SPARE DISK Copy the working drive (disk 2) data to a third 500GB DISK (disk 3), remove the logic board from the working disk (disk 2) and replace it with the non working logic board on the broken drive (disk 1) , then hopefully recreate the RAID 0 with disk 1 and disk 3, just long enough to get the data off it. Hope this makes sense, here are my questions: Windows disk manager atm recognises disk 2 but wont let me access it in anyway, therefore copying the data off it (or getting a disk image) cant be done in windows. Does anyone know of any software (in linux or self booting) that would allow me to access this disk? Anyone know of any software that will recreate the spanned drive off two disk images Am i missing any key information that means i definitely shouldn't even bother starting this, i know its a long shot anyway but its worth a try unless i definitely cant do it. The irritating thing is that i am sure its a logic board failure on disk 1 as it simply wont power up at all, suddenly no signs of life, so i am sure the data is intact! Any help would be really appreciated! Thanks

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• Windows recovery partition with GRUB2

  - by Actorclavilis

  So I recently got a new Toshiba laptop and installed Ubuntu 12.04 on it. Since it is a "Windows 7 Enabled" machine or some other proprietary nonsense like that, a few hardware features are designed only to work with W7. Eventually I found a way to enable these hardware functions by booting into the W7 recovery disc; however, they sporadically stop working. I'm moderately surprised that I was able to get anything to work at all, so I don't especially want to spend more time fixing the problems in a different fashion. Now I don't actually own the recovery disc; it's my father's. Since it's a pain to have to go asking for the disc every time the features stop working, I made an image of the disc and was hoping to make a 'recovery' partition like some computers have. However, unetbootin and GRUB2 both want a kernel and initrd to point to on startup, and something like set root=(hd0,1) loopback lo /w7r.iso set root=(lo) chainloader +1 in the spirit of the makeactive/ chainloader +1 commands that I used to use to dual-boot Linux and Windows simply gives me a file-not-found error. My question, therefore, is: Is it possible to, having written a Windows iso to a partition (such as with dd if=w7r.iso of=/dev/sda4) to a partition, convince GRUB2 to boot from it? Thanks in advance.

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• How do you initialize networking on a new Xen guest VM?

  - by Marten Veldthuis

  We have a Citrix XenServer setup, and while I personally lean more towards Dev than Ops, I've got an issue that's been bugging me. When you provision a new (Linux/Ubuntu) guest, how do you get it to have the correct IP-address? I'd want my application servers to exist in the range of 10.20.0.0/24, preferably being .1, .2, etc, so I can keep my sanity. I guess that the actual IP-address is something set in Linux itself, and Xen can't touch that, but then what's the best practice for getting it done? If you set up DHCP, don't you just move the problem to getting the adapters the "correct" MAC-addresses? Do you just have to hardcode a large table of MAC-addresses to IP-addresses, and then provision new guests always with the correct MAC-address on the virtual ethernet adapter? What we currently do is have an image of a "app server" that we boot up a new instance of, and then finalize it (with a script) that (among other things) modifies the /etc/networking/interface file to give it the correct IP. But that feels dirty to me, and I feel like surely there must a better way. Please enlighten me?

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• Why might my Fedora 15 live USB persistent storage not work?

  - by Richard J Foster

  I created a Fedora 15 "live" USB stick using the live USB creator found at https://fedorahosted.org/liveusb-creator/ and the Fedora 15 i686 Desktop ISO image with the persistent storage space set to 4096MB. (The USB stick I have available has an 8GB capacity, so there should be plenty of space.) Fedora appears to boot correctly, however it seems that the persistent storage is not working. To verify this, I opened a terminal prompt, then did su - followed by yum update yum. As expected, I was informed that a new version was available. (The live CD contains version 3.2.29-4, at the time of typing 3.2.29-6 is the current version). After installing, I verified that the new version was installed by typing yum --version. I then shutdown the system using shutdown now. After the system had shut down, I rebooted and returned to the terminal prompt. On typing yum --version, I was informed that the version was 3.2.29-4 (i.e. the original version). Why might the persistent storage not be working? Is there anything I can do to fix it?

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• Using wildcard domains to serve images without http blocking

  - by iopener

  I read that browsers sometimes block waiting for multiple images from the same host, and I'm trying to do everything I can to speed up page load times. One caveat: I need to serve files over HTTPS. Any opinions about whether this is feasible: Setup a wildcard cert for *.domain.com. Whenever I need an image, generate an number based on a hash mod 5 of the filename, and append it to an 'img' subdomain (eg img1.domain.com, img4.domain.com, img3.domain.com, etc.); the hash will make any filename always use the same subdomain, and therefore the browser should be able to cache the images Configure a dynamic virtualhost record to point all img#. subdomains to /var/www/img I am looking for feedback about this plan. My concerns are: Will I get warnings when my page has https:// links to multiple subdomains? Is the dynamic virtualhost record I'm talking about even possible? Considering the amount of processing this would require, is it likely to even produce any kind of overall benefit? I'm probably averaging a half-dozen images per page, with only half being changed on each page refresh. Thanks in advance for you feedback.

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• How to set up RAID-0 first time on new PC?

  - by jasondavis

  I have built basic PC's in the past but have never used a RAID array at all. SO now I am buying parts to build my new PC, it will be an intel i7 processor. My motherboard will have RAID support which I will use instead of an aftermarket raid controller for now. Also I plan to use 2 SSD drives in RAID-0 for my windows 7 OS. (Please note that I am aware of the issues with doing this, including lack of TRIM support when using RAID with SSD drives. I am OK with it not working as I can just re[place the drives in a year or so or wheneer they become more sluggish). SO here is my question part. If I assemble the motherboard, PSU, processor, RAM, vidm card, etc and then go to turn the PC on, it will have the 2 SSD drives hooked up. so I assume I will then soon the BIOS screen before I install windows? How to I go about making the 2 drives work in RAID-0 at this point? I do the raid part before installing my OS right? Please help with the steps involved from assembling the parts of the PC and then turning it on, to the part of getting the RAID-0 set up between the 2 drives and then installing my windows 7 OS from a Optical drive? Please help, all advice, instructions, tips appreciated as long as on topic. I do not need to be told that this is a bad idea as far as if 1 drive fails I losse it all, I plan on having a disk IMAGE to be able to restore my OS and software to a new set of drives at anytime needed in the event of drive failure. Same goes for lack of TRIM support. Thanks for reading and help =)

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• Does MySQL have some kind of DoS protection or per-user query limit?

  - by Ghostrider

  I'm a bit at a loss. I'm running a MySQL database that's roughly 1GB data in indices combined on a dedicated Linux server. DB version is '5.0.89-community'. Configuration is controlled via cPanel. PHP actually runs elsewhere on a shared hosting. IP addresses are static and don't change. Access from remote IP address is properly configured. Website gets around 10K hits per day with each hit generating a a database query. Some of these queries are expensive (~1 sec execution time). All is fine and well until at some point DB server starts refusing connections from the client, claiming that specific user can't access the server from that IP. Resetting the server will always fix the problem for a day or two and then the same thing happens. There are some other DBs on that server, some of which are hit pretty hard on occasion but constantnly. One of the apps maintains several persistent connections since it does couple of updates per minute. Though I don't think it's related. What's driving me mad is that I can't figure out why server would start refusing connections. There is nothing in the logs. This server is a hosted dedicated server so hosting company created the OS image and I didn't write or go over every line of configuration. I'd do it but I'm at a loss as to where start looking. Any advice is appreciated.

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• Quickly set up a Windows Server and automatically install and configure software

  - by Chris

  Yesterday I spent far too much time downloading and installing software on Windows Server 2008. I only had to install a simple server for SQL Server 2008 Express using Microsoft's Web Platform Installer, then configure it to enable remote connections. Everything had to be attended, wasting my time. On a Linux system, this would be trivial to automate, but this is Windows. I do this very rarely, but in the future I would like to make this take as little time as possible. I could do a disc image with everything I installed and configured, but is there a better way? I know nothing of advanced deployment techniques on Windows. Ideally I would like to be able to remotely re-install the OS, or have an unattended install (which I know is possible). Any tips to make the software I need easier to and install and configure with minimal interaction necessary would be helpful. I don't expect everything I asked for to be possible and easy to do. Basically, If any part of it can be done quicker or at least without user input, that's what I'm looking for.

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