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• Nginx rewrite rules, some work, some don't

  - by Lawrence Goldstien

  Here are the two rewrite rules: This one works rewrite ^/knowledgebase/([0-9]+)/[a-z0-9_-]+.html$ /./knowledgebase.php?action=displayarticle&id=$1 last; This one doesn't rewrite ^/announcements/([0-9]+)/[a-z0-9_-]+.html$ /./announcements.php?id=$1 last; There is no difference between the two as far as I can see. The url to be rewritten for announcements is: /announcements/2/New-Site-Design.html And should be rewritten to: /announcements.php?id=2 I really can't see how the announcements one doesn't work compared to the knowledgebase one. Any tips would be greatly appreciated.

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• Error while trying to configure VLAN with Open vSwitch

  - by Abhishek Chanda

  I am trying to connect a number of VMs using Open vSwitch. The VMs are on two separate physical boxes. Here is what I did: Created two tap devices on one physical host sudo ip tuntap add mode tap tap0 and same for tap1 Bring them up sudo ip link set tap0 up Add them as ports to Open vSwitch (br0 was created as a OVS bridge previously) sudo ovs-vsctl add-port br0 tap0 tag=1 Now I booted the VMs (using VirtualBox) and assigned addresses 192.168.122.11 and 192.168.122.12. Now when I try to ping one VM from another, I get the error Connect: network is unreachable. Since both VMs are connected to the switch on the same VLAN, I expect to be able to ping one from another. What is going wrong here?

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• misaligned raid partition in Ubuntu 10.04

  - by Linux Jedi

  I attached two identical hard drives to my linux machine. Then using gparted I formated the first 1024 mb at the beginning of each drive as linux swap space. Then I went into system-administration-disk utility. In there I went to file-create-RAID array. I selected the remaining space in each of the two identical hard drives and created a striped raid array. After the array was created, a warning message appeared. It said "The partition is misaligned by 522240 bytes. This may result in very poor performance. Repartitioning is suggested." What do I do now? As far as I can tell, the partitions are identical.

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• iPhone VPN to iTunes Home Sharing

  - by Philip Crumpton

  my goal is to set up a VPN on a Windows machine that contains my iTunes library then connect to that VPN with my iPhone and be able to utilize Home Sharing remotely. I have read that this can easily be set up if the iTunes library is on a Mac (Network Beacon and YazSoft ShareTool are two products I quickly found). I can't find anyone who has had success on a Windows machine, though. In my thinking, there are two options (aside from buying a Mac): 1.) Existing utility that takes care of this for me (like the Mac-only options listed above) and is compatible with iPhone (Hamachi is NOT compatible with iPhone VPN) 2.) Manually configure a VPN to allow Bonjour multicast (can't find any information on this) FYI my router is a Linksys WRT54GL running Tomato 1.28

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• Is there a limit on the number of USB external drives?

  - by Beska

  I've got three external HDDs, all My Books, 500 GB, 750 GB, and 1 TB. If I hook one or two of them up to a computer, everything seems fine. If I hook all three of them to a computer (I've tried this on two different computers, one running Windows XP, one running Windows Vista), the bootup time goes up by more than an order of magnitude. It can suddenly take about 10-20 minutes to boot the machine, whereas before it might take a minute. All three drives work fine on their own. I'm not using any kind of hub; all three are plugged directly into the machine. Is this associated with some kind of inherent limit in USB? Is this bad hardware design in the CPU box? Is this a My Book problem?

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• Is it safe to use a single switch for multiple subnets?

  - by George Bailey

  For a moment, forget about whether the following is typical or easy to explain, is it safe and sound? Internet | ISP supplied router x.x.x.1 (public subnet) | switch-------------------------------------+ | (public subnet) | (public subnet) BVI router (switch with an access list) NAT router | (public subnet) | (private subnet 192.168.50.1) +--------------------------------switch----+ (both subnets) | | computer with IP 192.168.50.2 ------+ +----computer with IP x.x.x.2 I don't plan to implement this setup, but I am curious about it. The 50.2 computer may send a packet to the x.2 computer, but it will use 50.1 as the router, since 50.2 knows that the subnet is different. Would this result in the packet being received twice by the x.2 machine, first directly through the switch, second by way of the two routers? Do you see any problems with this aside from how confusing it is, and that it would put one switch doing the work of two subnets?

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• How can I copy a SQL Azure Database to a server on a different subscription?

  - by Tragedian

  I'm trying to create a copy of a SQL Azure database. The source and destination servers are associated with two different subscriptions, but they are located in the same data-centre. I've been reading Copying Databases in Windows SQL Azure Database and How to: Copy Your Databases (Windows Azure SQL Database) for instructions on this, but I'm not sure if my scenario is covered. I would like to use the CREATE DATABASE Database1B AS COPY OF Database1A; command, but I don't know what the implications are on the accounts used, or what I need to set up between the two databases before this command is possible. Has anybody achieved this type of copy and can elaborate?

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• Is there a media player that allows me to group together radio streams which are just mirrors of the

  - by rakete

  I find it really annoying that for some radio stations, which have two or more servers to cope with the network load, there is not one single entry in amaroks playlist but two or more entries. This makes it hard to pick the radio station from the list I like to listen to because all the entries are always shown with the last played track as name, and even if I only have a few radio stations in my list there will eventually be many different entries. And, if I use the keyboard shortcuts to navigate the playlist I always have to remember that radio station X has for example four entries in the playlist, so I have to press the shortcut for switching tracks four times to actually switch the to the next station. Now, ideally I would like some solution for amarok, but if someone knows of another media player that does this or something I would appreciate that information as well.

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• How to format the not used OS partition?

  - by Eslam

  I have two operating systems on two different partitions, & I want to format the not used partition. When I right-click on it to choose format, the formatting process doesn't complete & a message appears saying (windows was unable to complete the format). So I need to know another way to format this partition Note: I use windows xp sp2, & i use partition (D) & i want to format the (C) & i don't know how to do that through command line, if it possible i will be so grateful Thanks

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• Sharing internet through a wireless ad-hoc in Windows 7

  - by vzait

  I'm actually requesting a workaround to share a PPoE wired Internet connection between two laptops using wireless. I've tried sharing it the usual way... New Ad-hoc = Click turn On sharing = etc. I've tried changing all the settings I could find related to the two networks on both machines. Conclusion: Sometimes it works, sometimes it doesn't. Is it really buggy, or are my hands growing from the wrong place? I'm almost sure I'm not the only one having this kind of problem. What is the easiest/correct workaround ?

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• How do I hookup a dual video card Crossfire rig to a single monitor?

  - by Alexed

  I just received a new Alienware box preinstalled with two nice shiny ATI 6950 graphics cards. My goal is to use both of them to give me really good resolution and frame rate on my single monitor. There's zero documentation with the Alienware box and nothing I can find online. Do I just plug the monitor into one of the cards, and expect the two cards to do magic internally? The ATI Crossfire website indicates a need for an "external crossfirex connection cable". Do I need to buy one of these? If so, what kind of cable is it? The AMD Catalyst Control Center shows the second card as "Linked" but when I go to the AMD Overdrive section, the second card is at zero temperature, and clock, suggesting it's not actually doing anything. What do I need to do to make use of both cards? Is it something that doesn't kick in until I do something graphically intensive?

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• Accesing internet with Host-Only network VirtualBox

  - by Bibo

  I have two VMs in my VirtualBox. Both are FreeBSD and should communicate between each other. I have created network with DHCP enabled and set like this: Server Address 10.10.10.1 Server Mask 255.255.255.0 Lower Address Bound 10.10.10.100 Upper Address Bound 10.10.10.200 My VMs are pinging each other and getting right ip adress. This is what I must have and can´t change. Now I want to access internet from one VM and I found that I must use two network cards but I don´t know how to set the second one. I am new with VirtualBox and this stuff so if you count with this in you answer I would appreciate that. And I have Windows 8 as host system if it´s matter.

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• Host http:// and https:// for same domain on separate IIS servers

  - by The Talking Walnut

  Is it possible to host http://example.com and https://example.com on two separate IIS servers?

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• HP DL160 G6 memory PC3-10600R vs PC3-10600E

  - by Jeremy Hajek

  I am using a HP DL 160 G6 server that according to specs takes PC3 Registered or Unbuffered. When I combine the two types of memory below the system will not POST. When I use just the first type of memory listed the system will POST. I have two pieces of HP memory that came with the server labeled PC3-10600E-9-10-E0 and then I have some Crucial memory labeled PC3-10600R-9-10-B0 I wager that the R means Registered memory and the E means ECC - then shouldn't the crucial memory boot with the system according to the HP specs? Or does the E mean it is Unbuffered and therefore I shouldn't mix and match as according to this HP memory config doc?

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• In Varnish, is it normal for the number of freed bytes to be 60% of those allocated?

  - by user331397

  I have an installation of Varnish 3.02 on an Amazon EC2 Medium Linux instance in front of two relatively low-traffic websites. After an uptime of 2 hours, there are 3400 objects in the cache. Using varnishstat, I checked the variables SMA.s0.c_bytes and SMA.s0.c_freed, which I assume correspond to the total number of bytes allocated since startup and the number freed, respectively. No objects should have had time to expire during these two hours, but still about 60% of the memory allocated since startup (330MB out of 560MB) has already been freed. Do you know if this is normal? If not, do you know what kind of configuration could be wrong?

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• Virtualizing Firewalls/UTM

  - by TheD

  So Sophos UTM (Astaro Gateway UTM) can be virtualized in Hyper-V, VMWare, vSphere etc. Now I'm new to virtualization, so am wondering how the networking would be configured in this situation. Imagine the following (a very simple setup). A Zyxel router acting as the default gateway, standard ADSL line. This is connected directly via Ethernet to my VHost, Hyper-V in my case. Now I assume I need two virtual network adapters, one which is the "External" interface to the firewall, and the other being the "Internal" interface. But where does my switch go, since I have 5 machines (or X number of machines). Where is the switch connected, to the internal interface on the VHost? What default gateway do my clients use etc? How would the routing work if these two interfaces weren't bridged since they are virtual networks anyway. I'm a little confused! Any advice is much appreciated! Cheers

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• When USB keyboard is plugged in on computer start-up, search results window is being opened multiple times

  - by Dvir Azulay

  As the title says - when my Alienware keyboard is plugged into my laptop during Windows 7 resume from sleep/hibernation, the windows search results and help window (F3, F1 on Windows 7) is being opened multiple times. This behavior won't stop until I pull out one of the two USB connectors this keyboard has. When I plug it back, everything is normal. Also, if I only connect one of the two during Windows resume, it won't happen. Do you have any idea what could cause this weird issue? Edit: Following the feedback on comments suggesting to log my keypress'es during the weird behavior, I've noticed it's actually F1, F2, F3 being spammed in an ordered sequence. Clicking on them manually didn't stop them from repeating.

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• ext4: error loading journal

  - by cloudyOutside

  I have an external hard drive with two partitions: A small FAT32 which is mostly empty and works fine and a large ext4 with tons of data, most of which isn't backed up. The ext4 is visible, but can't be mounted. I get an "error loading journal" error. The drive is a Western Digital Caviar Blue 500GB. Roughly 30GB of that is FAT32 and the rest is the ext4. The light on the enclosure turns red when reading from the bad partition. It was made by Cavalry. There wasn't any warning, but coincidentally, I've been thinking lately that I should get two large capacity drives for real backups. Is there anything that can be done? I'm not even sure I have enough storage to backup everything even if it is redeemable.

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• my.cnf in server directory, why

  - by Mellon

  On my Ubuntu machine, I have installed MySQL . I notice that there are /etc/my.cnf file which contain the content (only two lines): innodb_buffer_pool_size = 1G max_allowed_packet = 512M While there is also /etc/mysql/my.cnf with a long content like: # The MySQL database server configuration file. ... ... For me, it looks like both are configurations for MySQL server, but Why there are two my.cnf in different locations, can't the content to be merged to one my.cnf ? What is the purpose to have seperate my.cnf for MySQL server ?

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• HP DV5T laptop problems using Adobe in multiple monitors

  - by Rolnik

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

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• ASA Slow IPSec Performance

  - by Brent

  I have a IPSec link between two sites over ASA 5520s running 8.4(3) and I am getting extremly poor performance when traffic passes over the VPN. CPU on the device is 13%, Memory at 408 MB, and active VPN sessions 2 so the load on the device is particularly low. Screenshot of wireshark file transfer between the two hosts over the VPN: The large amount of Header checksum failures is alarming, but I am not sure what to check now. I perf is showing around 4-5 Mbit/sec with differing TCP window sizes. Show Run on the ASA http://pastebin.com/uKM4Jh76 Show cry accelerator stats http://pastebin.com/xQahnqK3

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• Complete machine freezes...at a loss

  - by user28818

  Guys, We built around 12 machines a few months ago to run Ubuntu. They each have the following specs: ASUS Z8NA-D6 motherboard Dual quad core Intel(R) Xeon(R) CPU E5520 @ 2.27GHz OCZ Mod Extreme Pro 500W power supply 12 GB Kingston RAM Nvidia GeForce 9800 GT graphics card My machine ran well for awhile. However, it started experiencing random lockups. These lockups are not X lockups, they are complete system freezes. The nic stops responding, the magic sysrq buttons won't work. The machine is dead. I first suspected RAM. Memtest86 didn't find anything, but I replaced the RAM anyway. Still, lockups. So I replaced the graphics card. Still, more lockups. They became more and more frequent and started to happen 2-3 times a day. So I replaced the motherboard and power supply in one fell swoop. Suddenly, no more lockups! Woohoo! Except, a week later, in the morning, the machine wouldn't wake up. I reset it, started it up, and the log files showed the last entry at around 11 pm the evening before. This has started occurring with more frequency...now just about every morning I come in, the machine is locked up, and has been since the night before. Yesterday, in the 3 weeks since I replaced the motherboard and power supply, the machine actually locked up on in in mid-work. This is the first time since replacing the two (MB and PS) that this happened while I was using it. All others occurred while I was away. I'm at a loss. Nothing is in syslog or message that would indicate a problem around the time of the lockup. Temps are good...I use lmsensors to monitor and have a script that writes the output to file every minute. They never get that high. The only thing I haven't replaced at this point is the case and the harddrives. I doubt either could be the cause. What would you do if you were in my shoes? Is there a troubleshooting approach I'm missing? For the record, all of the other machines, all eleven of them, don't have any problems. They're all running the same version of Ubuntu (Lucid) that I am. Thanks!

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• How do I extract files from one tarball to another tarball in one step?

  - by Martin

  I have some fairly large tarball archives, from which I need to extract some files. I will later repack those files to transfer them to another server. Currently that is a two (multi) step process for me: mkdir ttmp tar -vxzf large.tgz -C ttmp/ --strip-components=<INT> <folder-to-be-extracted> or alternatively with wildcards mkdir ttmp tar -vxzf large.tgz -C ttmp/ --strip-components=<INT> \ --wildcards --no-anchored '*pattern*' Then I go ahead and recompress the created folder tar -vczf small.tgz ttmp/* rm -rf ttmp How can I combine these two commands into one? Like this tar -x large.tgz > tar -c small.tgz Just to show, what I already tried: Whenever I search the terms "extract" I will end up here or here or even here. When I use the term "split" I will end up here and that is definitely not what I intend to do. When I use "repack" I end up in strange places.

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• Schedled Tasks and Environment Variables

  - by Andrew J. Brehm

  I have a scheduled task, a batch file, that uses an environment variables which is set system-wide. On server 1, the scheduled task runs under a domain account and the environment variable works. The environment variable also exists in my session and when I runas as the service account. On server 2, the scheduled task runs under a different domain account and the environment variable DOES NOT work. However, the environment variable does exist in my session and when I runas as the service account. On both servers the environment variable has been set system-wide by the same script originally. The script runs again every now and then and as far as I can see noone has tempered with the environment variable. The scheduled tasks are set up identically on the two servers (using the same XML file) and the two service accounts are identically configured (as far as I know). What am I doing wrong?

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• Setting up Mac VPN on simple network with separate IPs

  - by Dave

  Hi there, We have a pretty simple network configuration. A typical ASDL line with two extra IP addresses. We have a basic home network router Dlink DIR-655. We have two Mac OS X Snow Leopard Servers that we want to setup VPN on. The problem is that we can't change the ports which VPN works under ie. we can only setup port forwarding for UDP 500,1701,4500 to a single server. I'm wondering how we can cost effectively re-work our network so that we can take advantage of the separate IP addresses and have both VPNs working with the same router. Is that possible with our current hardware setup or do we need something more powerful? We're also toying with Mobile Access and wondering if that might be easier to setup. Expert help is greatly appreciated.

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