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• Mitigating the 'firesheep' attack at the network layer?

  - by pobk

  What are the sysadmin's thoughts on mitigating the 'firesheep' attack for servers they manage? Firesheep is a new firefox extension that allows anyone who installs it to sidejack session it can discover. It does it's discovery by sniffing packets on the network and looking for session cookies from known sites. It is relatively easy to write plugins for the extension to listen for cookies from additional sites. From a systems/network perspective, we've discussed the possibility of encrypting the whole site, but this introduces additional load on servers and screws with site-indexing, assets and general performance. One option we've investigated is to use our firewalls to do SSL Offload, but as I mentioned earlier, this would require all of the site to be encrypted. What's the general thoughts on protecting against this attack vector? I've asked a similar question on StackOverflow, however, it would be interesting to see what the systems engineers thought.

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• Why do I get a GRUB error after deleting the Linux partition?

  - by nateify

  I had a dual-boot setup with Windows 7 and Windows Vista. I used Easus Partition Manager and shrank my Windows 7 partition. In the empty space, I installed Linux Mint. I decided I didn't want it anymore, I simply deleted the Linux Mint partition. Now when I boot, all I get is this: GRUB loading. error: no such partition grub rescue> I don't have my Windows 7 install disk because it was pre-installed.

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• In BASH, are wildcard expansions guaranteed to be in order?

  - by ArtB

  Is the expansion of a wildcard in BASH guaranteed to be in alphabetical order? I forced to split a large file into [10Mb pieces][1] so that they can be be accepted by my Mercurial repository. So I was thinking I could use: split -b 10485760 Big.file BigFilePiece. and then in place of: cat BigFile | bigFileProcessor I could do: cat BigFilePiece.* | bigFileProcessor In its place. However, I could not find anywhere that guaranteed that the expansion of the asterisk (aka wildcard, aka '*' ) would always be in alphabetical order so that .aa came before .ab ( as opposed to be timestamp ordering or something like that ). Also, are there any flaws in my plan? How great is the performance cost of cating the file together?

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• Missing 16:10 resolutions with Nvidia drivers (Can't add resolutions)

  - by Wuinny

  I have a laptop with a Nvidia 9650M GT and used the drivers that Seven brought me. It works fine but Metro 2033 tells me that I have to upgrade my drivers to play the game. So I did it. But since I did a clean install of the new Nvidia drivers, I just have 1440*900 or 4:3 resolutions. I usually played with 1280*800 or 1184*740 (for performance issue) With the "old" drivers I was able to create custom resolution (1184*740) in Nvidia control panel but now when I try it tells me that "my monitor cannot support this resolution". When I insist, it works but soon as I shut down my computer I have to recreate it.. Do anyone have a fix?

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• Easiest way to move my Windows installation to an SSD?

  - by Jon Artus

  I've taken the plunge and bought an SSD and want to move my existing Windows installation over. The current hard disk is 500Gb, but I've trimmed the contents down to about ~40Gb. I'm transferring it across to a 100Gb SSD and looking for the easiest way just to copy everything across and set the SSD up as a boot device. I've looked at a few tools like Macrium Reflect, but they don't seem able to restore to a smaller drive. Do I need to go for something like PING to do this? I'm trying to avoid scary Linux-based boot utilities if possible, does anyone know of an easier way?

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• What is OpenSVC?

  - by sh-beta

  OpenSVC was just ported to the FreeBSD platform. The little blurb in that announcement intrigued me so I went to the OpenSVC website and found this: OpenSVC is a 'service' manager, as in clustered service manager, designed for real-world heterogeneous datacenters and large-scale operations orchestrator (disaster recovery, for example). Services are collections of resources (virtual machine, ip, disk groups, filesystems, file synchronizations, and application launchers). Services can be started, stopped and queried for status, providing a consistent command set for wildly different service integration types. Service configurations, status and logs are pushed to a central database coupled to a web front-end (collector). Services can be administered using the stand-alone GPLv2 software stack deployed on the nodes (nodeware), or through the web-front end. Plus some UML-type graphics. Which is all neat, but I still don't understand: what does it do? Am I just being dense? What's the use case for this system?

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• Strange ports on default install of W7

  - by Sabre

  I have a base new install of windows 7, and when I went to look for something else I saw the attached netstat output. What concerns me is that this is Windows + Truecrypt + drivers, nothing else installed. The sequential high ranged ports belonging to several different seemingly not out of place services seemed odd. So I torched the install, used Active@ to scrub the disk, re-downloaded the ISO from MSDN, and did a fresh reinstall, viola, they are there again. It just seems out of place, I have seen a many netstats over the years, this one just strikes me as odd, so I started thinking rootkit? (JUst FYI, when I reloaded I named the machine "Error" so that is why the task manager reads the computer name as such.) So I would like to know if anyone else could explain it, and therefore is may be normal, or would they be worried as well, and should I start considering I have some very strange thing occuring on my network?

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• Windows 2008 Server on VMWare (hardware)

  - by Bill

  I want to setup a single server to run a few virtual servers for our datacenter. I do not have a lot of money to spend so I am trying to gain bang for the buck. My budget is around $2,000. So I was thinking about building the following as the VMWare physical server: Intel iCore 7 950 (LGA1366, 4 cores,8 threads) Gigabyte GA-X58-USB3 LGA 1366 X58 ATX Intel Motherboard 24 GB of Viper II Series, Sector 7 Edition, Extreme Performance DDR3-1600 (PC3-12800) CL9 Triple Channel Memory VelociRaptor 300GB 10,000 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive I am planning on running the newest version of VMWare ESXi (64-bit). On these I am planning on running a few various servers: Windows 2008 Server R2 w/ IIS (several custom built ASP.NET Apps) Windows 2008 Server R2 w/ MS SQL 2008 Database Server Linux Web Server w/ Several WordPress Blogs (XAMPP?) Windows 2008 Server R2 w/ IIS (DEV ENVIRONMENT) Windows 2008 Server R2 w/ MS SQL 2008 Database Server (DEV ENVIRONMENT) In your opinion, will this hardware be sufficient to run the above load with room for possible 2-3 more virtual machines (probably lightweight web servers)?

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• Putting a whole linux server under source control (git)

  - by Tobias Hertkorn

  I am thinking about putting my whole linux server under version control using git. The reason behind it being that that might be the easiest way to detect malicious modifications/rootkits. All I would naively think is necessary to check the integrity of the system: Mount the linux partition every week or so using a rescue system, check if the git repository is still untempered and then issue a git status to detect any changes made to the system. Apart from the obvious waste in disk space, are there any other negative side-effects? Is it a totally crazy idea? Is it even a secure way to check against rootkits since I most likely would have to at least exclude /dev and /proc ?

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• How can I display images on a MS Access 2007+ form with a hyperlink source?

  - by Yaaqov

  I am looking improve the efficiency of an Access 2010 database by using a web server with images and only storing the hyperlink source (i.e, http://www.images.com/images/image1.jpg) in the table. I know that one can save images as "attachements", using a "blob" object type, but when you're dealing with thousands of images, queries are bogged down, and performance suffers. So in short, is there are relatively simple way of displaying images on MS Access forms with a source that is a hyperlink address (storing files locally and using filepaths is not preferable). Thanks.

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• How to choose my own filename format for subscribed podcast files?

  - by user14068

  I subscribe to several podcasts where the filenames of the downloaded mp3 files have no particular pattern to them. When I copy the directory of accumulated mp3 files into my mp3 player, the files play in alphabetical order. What I really want is to play the files chronologically by release date. I currently use iTunes on Windows XP to download the files. What I do now is manually rename the files, adding the date in YYYYMMDD format to the start of each filename so that an alphabetical listing of files will correspond to their chronological order when I listen to them later in PocketTunes on my Palm Centro. Is there some way to get the release date into the filename automatically? If so, I could automate or possibly skip the file renaming step. I would switch from iTunes to something else if that would solve my problem. The file creation time on my local disk isn't a reliable indicator because sometimes I download a few days worth of content at one time, and the files don't necessarily get downloaded in chronological order.

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• VMWare Workstation 8, Sharing a VM without copying them to "Shared VMs location"

  - by Stebi

  I have a host computer (Win7-64) with three different harddrives. It runs several VMs which are distributed among those harddrives for a better performance. Now with VMWare Workstation 8 it is possible to "share" the VMs. I'd like to use this feature, but I have to convert the VMs to "Shared VMs". When I try this WMWare forces me to copy the VMs to one predefined folder, thus making my effort of distributing the VMs among the harddrives meaningless. Is there any possibility to keep the VMs where they are and share them anyway?

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• New power supply, now computer doesn't recognise hard drive?

  - by Mike

  Ok, I bought a new power supply, because my old one was too damn loud. I hooked it up to my PC, turned it on, everything is looking fine, start up detects my DVD drive, 2 hard disks.. then I get the message "BOOT FAILURE INSERT SYSTEM DISK". Now I've seen some other people talk about going into BIOS and changing the start up to the HDD and not the CD.. well I've done that and it doesn't help. If I let windows load up and it asks me to which partition I wish to install windows, no partition is present. It's as if after the initial start up the drives arn't being found. I plugged my old (but loud) PSU back in, connected up all the cables, and it works perfectly. Why does the new PSU not detect my HDD's after the first BIOS screen start up? Any ideas? :)

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• Mounting share over VPN

  - by user1337

  I have a CentOS 5 web server which currently mounts a NFS export on my Mac OS X 10.7 laptop. It works great, except over VPN I can't get it to mount at all. I tried SMBUp but haven't been able to get it working even locally. It doesn't look like there's an easy way to install netatalk for CentOS 5. Even still, I'm not sure if that's the best way to do it. I tried using a GUI SSH client that can "mount a FTP disk" and it would work, except the files require root access and there's no external root access and the client can't elevate permissions. The basic thing I need to do is have the server be able to read the files off of my laptop, connected via VPN. The files are frequently updated (every 5-20 seconds) so I don't want to manually do that via SSH. Which protocol can work with both platforms and easily handle the latency introduced by VPN (and potentially mobile broadband)? Thanks

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• Is running multiple databases on login going to make my Mac really slow?

  - by Walrus the Cat

  Sometime ago, I installed Postgres, and the Launch agent that causes it to run when I log in. Just now, I did the same thing for Mongo. I was just about to do it for Couch. I don't remember if I ever did it for MySQL, but I probably did. Mongo and Couch are just 'when I have time to look into it' sort of things, but I don't want to have to remember to start them when I do. I have a 2.4 Ghz processor and 8 GB ram. Is this sort of behavior going to significantly impact my computer's performance? Should I be scrambling to uninstall all but the database I'm currently using, or can I install all the things and run them all the time? Thanks

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• When HDD wakes up?

  - by NumberFour

  Im looking for some small script or application which could log the time when a non-system disk wakes up. I cannot identify which application or script wakes up my non-system drive (which has to be asleep until I work with it). I have already set the noatime flag, tried to use powertop and iotop to determine which application could prevent it from going to sleep - but with no result. So my plan is to set this drive asleep (hdparm -Y) and see at what time it gets regularly woken up. Thanks for any advice.

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• System stuttering caused by hard drive

  - by LukLed

  My system keeps freezing for about 1-2 second every time I try to do something. For example, when I enter URL in browser, it freezes and starts working after few seconds. It is probably related to hard drive. I installed HD tune and when benchmark is in progress, causing constant disk use, everything works fine in background, there are no lags. What can be the reason of this issue? My hardware is Acer Aspire 7740G-6969 running on Windows 7.

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• Redirect traffic to local address so iOS speedtest app measures LAN speed

  - by ivan_sig

  I have mounted a Speedtest Mini server on a local LAMP, so I can test my LAN speeds effortlessly just by opening the URL with a Flash enabled web browser, the thing is, I want my iOS and Android devices to test with the LAN server too, not with the WAN, as I'm trying to measure LAN-Only performance. Is there a way so I can redirect the traffic intended to an specific external IP (The one of the real server) to my local server?. I know the servers IP as a short Wireshark analysis gave me the data, but still searching for a way to make that redirect. I have Jailbreak and root on my devices, so playing with system files is not a problem. I've tried mounting a proxy and making redirects by the hosts file and domain names, but it looks like Ookla's app relies on IP address only.

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• When to use MySQL replication or DRBD for HA on Xen VM?

  - by user62513

  I'm setting up a database which needs to be needs to provide High Availabilty. My primary concern is high performance and robustness (I don't want something that will fail fast and badly). The database is accessed by the application at an average of 300 qps. It's will run on Xen VMs and it has some InnoDB tables as well as MyISAM tables. The VMs are connected via ethernet 100Mbit/s ethernet cables. Which of the two - MySQL replication or DRBD - would you recommend in such a situation? Or should I use DRBD to make the master database Highly Available and use MySQL replication on the slaves? I'm a developer so these things are all not so easy for me to make a sound judgement.

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• Any recommendations on a NAS for a home-super-user?

  - by marc_s

  Can anyone recommend a good NAS for use in a home-server environment? I would request at least 2, preferably 4 disks, and I am most interested in good to excellent throughput for file-server and backup purposes - don't need any of the fancy media-streaming or -sharing features, that's not of interest to me. For a 4 or more disk solution, support for the various RAID levels (0, 1, 1+0, 5) would be a plus - especially if supported in hardware (rather than just a software emulation). I just need a place to put my collection of data, ISO images, and so forth - and since several external disks (self-built and off-the-shelf) have failed so far, I'm looking into a more reliable solution. Marc

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• Can I move my Picasa data from one machine to another?

  - by Stuart Hemming

  I have lots of photos stored on an external hard disk. I have Picasa installed on my Windows 7 laptop and have spent a lot of time cataloging the collection, put names to faces and the like. I now have a new machine and I want all the hard work I did on my laptop to be available when I plug my external HD in to the new machine. Is there a magic spell I need to cast to make this happen? Or is all the data I need stored with the photos?

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• List of recent motherboards with BIOS / without UEFI [on hold]

  - by jmn

  I am building a new desktop PC and I want to have full disk encryption on it. TrueCrypt doesn't support UEFI as of now. Are there still recent motherboards out there without UEFI ? I didn't find any list and I am afraid that I will have to study each potential candidate's technical sheet before purchase. I want to buy 2 or 3 of the same model to be future proof. Newegg links will not help, I don't live in the USA ... this means that this post is a legitimate target for PRISM ;-) Thanks for your help.

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• When adding second processor to SQL Server, will it automatically balance the load?

  - by ddavis

  We have a SQL Server 2008 R2 (10.5) on a dedicated box with a single 2.4Ghz processor, which regularly runs at 70-80% CPU. We are going to be adding a significant number of users to the application and therefore want to add a second processor to the box (scale up). Will SQL Server automatically use the second processor to balance threads, or is there additional configuration that will need to be done? In other words, will adding the second processor drop my CPU usage to 35-40% per CPU, automatically balancing the load? Based on what I read here, it seems that it will: http://msdn.microsoft.com/en-us/library/ms181007.aspx However, I've read elsewhere that CPU performance gains can be made by assigning database tables to different filegroups, but I'm not sure we want to get that complicated at this point.

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• Is it possible to cause artificial network packet loss or latency?

  - by nbolton

  I'm trying to reproduce some issues on a deployed application where the MSSQL server and client are running in two separate machines. I think there may be network issues between the two machines, so I'd like to try and reproduce these conditions on two Hyper-V virtual machines (on the same virtual server). Of course, the network for these virtual machines is "local" so it's actually far from the conditions in a live environment. Is there a program I can run on either virtual machine which will degrade the network performance? Or maybe any other work arounds? For example, one way to reproduce the conditions may be to run the VMs on separate Hyper-V servers in geographically dispersed locations (so the SQL traffic goes over VPN or something) -- but this is a little long winded I think. There must be a simpler way.

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• Is possible to load Windows 7 from the eSATA drive, even if it's not supported in BIOS?

  - by ClarityForce

  I'm using a laptop which has eSATA connection. I would like to install Windows 7 on the external disk (to have it completely separated from the OS on the internal hdd). According to the manufacturer, booting from eSATA drive won't be possible. I've checked the BIOS settings and it appears to be correct - eSATA is not even listed in the boot sequence. I'm wondering if there can be any workaround to that limitation, for example starting a custom bootloader on the USB pendrive, just to boot Windows 7 on the eSATA drive.

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