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  • SQL server availability issue: large query stops other connections from connecting

    - by Carlos
    I've got a high-spec (multicore, RAID) server running MS SQL 2008, with several databases on it. I have a low throughput process that periodically needs a small amount of information from one of the DBs, and the code seems to work fine. However, sometimes when one of my colleagues does a huge query against one of the other DBs, I see full CPU usage on the machine, and connections from my app time out. Why does this happen? I would have thought the many cores and harddisks would somehow (together with cleverly written DB server) be able to keep at least some of the resources free for other apps? I'm pretty sure he doesn't use multiple connections for his query. What can I do to prevent this?

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  • Series On Embedded Development (Part 3) - Runtime Optionality

    - by Darryl Mocek
    What is runtime optionality? Runtime optionality means writing and packaging your code in such a way that all of the features are available at runtime, but aren't loaded and used if the feature isn't used. The code is separate, and you can even remove the code to save persistent storage if you know the feature will not be used. In native programming terms, it's splitting your application into separate shared libraries so you only have to load what you're using, which means it only impacts volatile memory when enabled at runtime. All the functionality is there, but if it's not used at runtime, it's not loaded. A good example of this in Java is JVMTI, Java's Virtual Machine Tool Interface. On smaller, embedded platforms, these libraries may not be there. If the libraries are not there, there's no effect on the runtime as long as you don't try to use the JVMTI features. There is a trade-off between size/performance and flexibility here. Putting code in separate libraries means loading that code will take longer and it will typically take up more persistent space. However, if the code is rarely used, you can save volatile memory by including it in a separate library. You can also use this method in Java by putting rarely-used code into one or more separate JAR's. Loading a JAR and parsing it takes CPU cycles and volatile memory. Putting all of your application's code into a single JAR means more processing for that JAR. Consider putting rarely-used code in a separate library/JAR.

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  • Cant access EC2 hosted website

    - by Himanshu Page
    For some reason, I am unable to access our website www.doccaster.com (Bad request nginx). We are hosted on amazon EC2 with elastic ip associated to it. The weird part is a) I can access it through the public dns url http://ec2-184-73-195-180.compute-1.amazonaws.com b) My co founder who is located in another city can access it via www.doccaster.com. I observed that my instance was failing reachability check, so I launched a new one and assigned it the the elastic ip. I tried to ping the ip address 184.73.195.180 from my machine but no success. Any help will be really appreciated. More details I ran the following command on my server netstat -lntp | grep -E 'apache|httpd' and it displays :::80 for httpd . Is this accurate ? Should it be 0:0:0:80 ? or doesnt matter?

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  • Make BIND use DHCP DNS as backup

    - by cainmi
    I run BIND locally on my OS X machine, to enable wildcard Apache vhosts, which requires setting the DNS server for all network interfaces to 127.0.0.1. This works great, but means when I am on a network which uses an internal DNS server to route special (i.e. .companyname) URLs to a server on the network, the lookup fails. I tried adding both 127.0.0.1 and the DHCP provided DNS server, but this doesn't work either. Is there a way to make BIND use the DHCP DNS server for requests it cannot resolve locally?

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  • TrueCrypt-ed Windows XP reseting administrative password

    - by Predrag Punosevac
    I have inherited a laptop running Windows XP 64bit professional from a former system admin of my Lab. The laptop is encrypted with TrueCrypt and luckily I have a password for TrueCrypt and can boot and login into the guest account. However this is where my problems starts. There are four account on the laptop three of which do have administrative privileges. However nobody of two formers members of the lab and one current member remember their passwords. I was given the assignment of recovering 2TB of data from that laptop. How does one go about reseting administrative password in Windows in particularly in the presence of TrueCrypt? If you are wondering I have never used Windows in my life so the only thing I usually with any Windows machine is just wipe out entire HDD and install OpenBSD.

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  • rsyslog server - Can you split up and organize logs?

    - by Jakobud
    I recently setup one of our servers as an rsyslog server. I now have our firewall setup to log everything to that rsyslog server. But there doesn't seem to be an organization of the logs. All the firewall logs are just being dumped into the /var/log/messages on the rsyslog server. I guess I was maybe expecting them to at least be in a machine specific log file or directory. How can I organize the incoming logging? If I setup 20 servers to all log everything to a central rsyslog server, I really don't want everything being dumped into one big file or a few files. How can I setup rsyslog to tell it where to log what? Like if all the logs for a specific server were in it's own directory/file, etc... Is this possible?

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  • Setup local EC2 style cloud?

    - by John Kramlich
    I was recently given 3 dual opteron 2400 servers with 4GB of RAM and 120GB hard drives. I am interested in setting up something similar to Amazon's EC2 for my own personal web development use. Basically, I would like to spin up instances from an ISO or other disk images and have them available to test and develop software. Are there open source solutions I can use to accomplish this? I am assuming one of the machines will need to act as a controller of some sort for the other two. I use Sun's VirtualBox on my local development machine to virtualize various versions of Microsoft Windows. However, I'm not sure if that's the best tool for what I am trying to achieve. I apologize in advance if this question is to vague to get meaningful responses. I am new to cloud computing and fairly new at server administration.

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  • What virtualization solution should I try next, after hitting problems w/ VMWare Player in dual-netw

    - by Alex R
    I have been using VMWare Player 2.5 for a while (Ubuntu guest on Vista host, 32-bit). VMWare had worked great until now but then I hit a brick wall: Due to some reorganization of my home network, the host machine now has to use a wireless connection to reach the Internet, while the printer, fileserver, and other important stuff are attached to a local gigabit hub. I have tried several tricks, such as editing the .vmx file, changing settings in vmnetcfg, etc, but I'm still unable to get the virtual Ubuntu box to connect each of the two virtual NICs to different networks (I did get it to recognize two NICs, but both DHCP'd onto the gigabit LAN). So, I'm ready to dump vmware for something with a little more low-level control of network settings. Virtualization is such a crowded space, I could spend months evaluating every product out there. I'm hoping for a shortcut... Can anyone recommend the best VM for my situation described above? Thanks

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  • How to prevent slow printer performance when AD is not available

    - by AKoran
    When I take a domain based computer (Windows XP) and plug it into a network that doesn't have access to the AD, the first time I select a local printer (printing directly to printer) on the current network it takes a good 20-30 seconds before I can select the printer. Doing a little investigating using wireshark I can see the computer is trying to hit AD for some reason and it just keeps timing out. I also tried the same experiment with just a plain workgroup computer and it was able to bring the printer up immediately. Does anyone know how to prevent the machine from trying to contact AD?

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  • How can I password-protect a Mac shared folder on a Windows workgroup?

    - by Phillip Oldham
    We have a Mac-mini running 10.5.8 which already acts as a fileserver for our simple Windows (mixed XP/Vista) workgroup. The Mac-mini is on the same workgroup and the files are shared via SMB, FTP, and AFP. Basic file-sharing is working, and has been for some time. We'd now like to add an additional directory/share which can be secured by a password so that only a small number on the network have access. Is this possible? I've already tried creating the additional folder on the mac system, adding it to the shared folders, and limiting it to a specific "shared user", however it's not possible to log-in from an XP machine. Adding a sub-directory to the currently working share and giving limiting it's access to the shared user doesn't work either.

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  • Start Menu freezes when highlighting 'All Programs'

    - by gergesi
    Hey all, A friends machine is lagging for about 30 seconds when they highlight 'All Programs'. A gray box popus up where the program menu would be, but it doesnt populate for nearly 30 seconds. This seems to happen if he hasn't open the start menu for a bit.. but if he get's it working once, doing it immediatly afterwards will usually not have the same lag. Assuming computer hardware isn't an issue, any ideas what the problem may be? Sidenote: He mentioned making desktop shortcuts is taking long as well, does that give any clues?

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  • why doesn't my computer resume after sleeping overnight?

    - by bamdad
    i'm having a weird, weird bug that's been haunting me since 11.10. if i listen to music or watch a video and my computer automatically goes to sleep at night, it won't properly resume in the morning. otherwise, suspend and resume works just fine. what happens is that the wi-fi and bluetooth indicator (that turns from white to orange when suspending) stays orange, the display doesn't turn on, and the only option i have is to hard reset the machine. here's what i've tried so far: installing (and uninstalling and reinstalling) laptop-mode-tools switching the proprietary wireless driver (broadcom-wl) to the open source one (brcmsmac & bcma) and back unloading (and blacklisting) all bluetooth modules (rfcomm, btusb, bnep, bluetooth) and stopping (# stop bluetooth) and disabling (# echo 'manual' /etc/init/bluetooth.override) the bluetooth service creating a custom pm sleep action as suggested here: http://ubuntuforums.org/showthread.php?p=11926504 not watching youtube / any stuff that uses flash before going to sleep (i have flashblock, and i checked $ ps aux | grep flash) because i suspected flash to be the culprit trying out different versions of fglrx (the one from the repos, then installing the latest one from amd's site via generated .deb files, then back to the official ones) none of these worked. i remember back in the days of 10.04, there was a gconf key called network sleep: i thought about disabling that, since re-enabling the wireless card seems to be the problem (according to the indicator led), but the option appears to be missing from gnome 3 (unity-2d, whatever). does anyone have any ideas? thanks, bamdad

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  • How to prevent people taking software home?

    - by Robert MacLean
    Most companies I have worked at have had either a collection of disks or a network share with the installs of the commonly used software in them. This is to allow the IT dept and skilled users to install the software they need on their work machines very easily. However some users would see this as an opportunity to get "free" software for their home machines. I've seen the draconian approach of locking the machine down completely, but that does not work well (in my view - if you disagree feel free to comment on it) because You add so much extra work to IT Users get that big brother feeling So how do you find a way to prevent users from taking home software but still allowing them to install what they need? You can make the assumption that most of the users in the organisations I work in are smart enough to install software, I'm not worried about the tea lady here.

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  • How do I make a backup of a live server?

    - by Jurily
    At my new job, I have a production server with the following qualities: Windows (XP I think), ancient hardware Absolutely vital database No backups whatsoever Everyone in the company has full admin rights, the passwords are stored in a .txt on the global share No installers, except for the OS The machine itself is sitting on a wooden shelf 5 feet above the ground against an external wall with frequent truck traffic on the other side; the shelf is already bent from the constant load Hasn't been rebooted in $DEITY knows how long, my predecessor wasn't even sure if it would survive it UPS is installed, but since everything is hooked up to it, it would last 10 minutes tops No spare parts or hardware budget How do I make a full backup with minimal impact on the server? I'm not sure how close it is to a total meltdown. For all I know, plugging in a USB stick could kill the company, and of course it will be all my fault, since "it was running fine before you touched it". The ideal solution would be a VM, so I have a test environment as well (separate of course).

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  • Overriding RPM public key database

    - by pilcrow
    Can rpm be persuaded to import and fetch public keys from an arbitrary pubkey database? On the same build machine I've got two automated users who each need to verify package signatures from different sources, signed under different keys. If I rpm --import pkg-source1.pub pkg-source2.pub, each user will be able to verify packages intended for the other. I'd rather each user not know about the other's public keyring. Is there a way I can specify an alternate or supplementary pubkey database on a per-user or per-rpm(8)-invocation basis?

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  • ubuntu 12.04 - keep getting "Server not found" for some websites

    - by android developer
    ever since last week , i've noticed that many websites cannot be accessed , and it doesn't matter if i use firefox or chromium as a web browser . as an example of such a website is: http://tutorials-android.blogspot.co.il/2011/05/layout-animation-in-android.html all i get is a "Server not found" error page . sometimes after a few refreshes it works just fine . i've checked it on a windows OS machine that is connected to the exact same LAN network , and the website is shown just fine . i've also checked the /etc/hosts file and it doesn't contain anything suspicious . what is going on? how can i fix it?

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  • CentOS, CUPS - printer managment

    - by HTF
    I'm using CentOS 6.3, and trying to get a printer PIXMA iP4950 to work. The printer is attached via USB. I've downloaded and installed the drivers from the Cannon website, and have the printer installed in CUPS. However, when I print anything (even the test page), the job is completed successfully (according to CUPS-log), but the printer does not print a thing. I don't know how to debug this. Have tried to change logging to debug, but I don't see any errors in the error_log and the access_log says: Returning IPP successful-ok for Get-Jobs (ipp://localhost:631/printers/Canon_iP4900_series) from localhost Please note that I was able to print on another CentOS machine however with GNOME Desktop.

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  • Network monitoring library, or objects, for a cloud

    - by Andrew Smith
    I am looking for library to support server / switch monitoring, to actually be able to check with the device if it's working OK. However this requires some sort of auto-detection and device support. Basically I need to automatically detect a new device, start monitoring it like CPU and PING. So how do I auto-detect the machine remotely, this is something I need library for. Rackspace has something like this - "Cloud Monitoring API". But is there anything opensource which can be used same way? The Nagios and others doesnt have such API, and the big and expensive systems are too big to handle in public cloud, so there must be some other network monitoring engine with API, which can add a new servers automatically and support user isolation for example so I dont see other servers except mine.

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  • Can Windows 8 boot from FireWire?

    - by Holli
    I read many times Windows 7 is unable to boot from an external FireWire drive but I wonder if Windows 8 is able to do so. I need to run Windows on my Mac but only very few times so my idea was to move it all to an external drive. I have one of the first Intel Macs so running Windows in a virtual machine is not really fun. The performance is just too poor. Adding a Boot Camp partition to my internal drive is also not possible at the moment.

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  • Create samba shortcut from command line

    - by neurolysis
    I'm currently wanting to deploy a setup to around 300 Macs. I have most of it scripted, but I'm having trouble creating a working alias to a samba share from the command line. I tried copying it from one Mac to another, but it loses its status as an alias, and instead OSX opens it in TextEdit. From a hexdump, it also looks like it has machine-specific information. So, say I wanted to create an alias to 'smb://server/share' on the desktop from the command line, how would I do that? I have also tried a tell in AppleScript, but it complained about the syntax (specifically, too many slashes, seemingly taking about smb://). Thanks.

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  • Exchange 2003 SMTP SSL and various email clients

    - by FrancisV
    This Exchange 2003 server sits behind a firewall with a virtual SMTP server listening on port 465 and attached an SSL certificate from Comodo to the virtual server. However, when trying to send from Apple Mail.app 4.x and Outlook 2011 for Mac, it never completes the connection (time out). Oddly though, the same setup works with Thunderbird. My question is: Does it matter if the friendly name of the certificate is different from the internal hostname? The machine has 2 hostnames: external and internal. The official SSL is using the external name. When using a self-signed certificate with the same name as the internal, I still can't send from the Mail.app and Exchange clients but I can with Thunderbird.

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  • Google Chrome gets really slow on 10+ open tabs

    - by Anton
    For some time already I face a problem with Google Chrome. I really love this browser, but on Windows 7 on a pretty decent machine (i5, 4GB RAM) it gets REALLY slow when I open for instance 10 techcrunch.com pages. Once I do that it becomes virtually difficult to scroll through pages and the general responsiveness of the browser gets down. And if I open 20+ or 30+ tabs there is a good chance all of them will crash. Does anyone got an idea? This happens to me on several PCs with Windows 7 64bit. At 10 tabs there is 600-700MB memory used by Chrome. Two systems have the issue are both laptops with integrated graphics. One by Intel, the other an nVidia GeForce 310M.

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  • Unable to create installdriver instance

    - by Entity
    When trying to install a program called "AV Grabber", I get the following error message. unable to create installdriver instance Product name is: EZ Grabber Right click on the executable 7.1.79.0 I have tried installing Install Sheild 7, but have no luck trying to remove this error message. Any Ideas? Machine: Windows XP (Home Edition) User Account: Administrator Account Folder version of installshield is visible from: C:\Program Files\Common Files\InstallShield\Driver\7\Intel 32 Have tried the following command, but have not helped. "C:\Program Files\Common Files\InstallShield\Driver\7\Intel 32\IDriver.exe" -Embedding

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  • Mac failing (failed?) hard drive - is all hope lost?

    - by Daniel
    It's a 500 GB Seagate laptop hard drive that came with my Macbook Pro. Apple partition format. Already replaced and now have it external, connected via SATA/USB adapter. Trying to get just a few files that I worked on while out of town when it crashed (and thus did not have my time machine backup drive). Drive will not mount, but OS X Disk Utility detects it and can read the capacity, model number, and even the name of the partition, which leads me to believe all hope may not be lost. Failed attempts so far: Disk Utility verify+repair says drive cannot be repaired and that I should back up immediately (lovely) Disk Warrior says it cannot rebuild the directory due to hardware failure Data Rescue quick & deep scans immediately failed PhotoRec says "error reading sector" for every sector (at least for the few minutes I let it run before closing it to explore other options) What else can I try here? Again, I'm just looking for a few, small files (python scripts to be specific) - not a full recovery.

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  • Xnest from Mac OSX to HP UX

    - by Burbas
    Hi, I'm trying to connect to my HP/UX machine from Mac OS X using Xnest. The problem is that I can not get the keyboard to work. I can see the login-prompt, but unable to type in my username. The connection is done by: Xnest :1 -query 192.168.0.193 -geometry 1280x1024 and it gives me some errors: (EE) AIGLX error: dlopen of /usr/X11/lib/dri/swrast_dri.so failed (dlopen(/usr/X11/lib/dri/swrast_dri.so, 5): image not found) (EE) GLX: could not load software renderer (EE) XKB: Couldn't open rules file /usr/X11/share/X11/xkb/rules/base (EE) XKB: No components provided for device Virtual core keyboard Couldn't get keyboard. I hope there is someone here who might have the answer :-).

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