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• How small (spec wise) can a virtual machine be and still boot up and run some sort of OS?

  - by IllvilJa

  One of the advantages with virtual machines is that you can be very flexible with their sizes. If the host system permits it, you can have a very large virtual machine with a lot of virtual RAM and disk. Also, you can decide to go the other way around, to give the virtual machine a very modest amount of RAM and disk and then choose and configure the OS appropriately. The question is, how small virtual machines have people managed to setup (and get to both boot up and to run)? Virtual machines doing something usuful is preferable, even if I know "useful" in this context is awfully subjective, but laboratory-cases with a configuration stripped beyond common sense could be intresting as well, just to see what people manage to boot and run. Quite open ended question and quite academic, but think of it: an extremely small VM (which still does something useful) takes very little memory and disk and can be quite quickly saved to and restored from disk. If it's also gentle on CPU resources, one might consider having a huge number of such VMs up and running on a host. (Imagine a VM running just an old Commodore 64 or Commodore Amiga in it. Ok, way wrong CPU architecture for modern Virtualization software running on a x86-based PC but still an interesting thought. You could have quite a few such small VMs running on a modern PC.)

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• ssh key questions

  - by Tim

  I have some questions regarding generating keys for ssh access: (1) Supposed there are two computers running ssh server service and I have generated a pair of key files on computer A and copy the public file to computer B. Is it true that this is only a one-way key: We only gave computer A permission to access computer B, not gave computer B permission to access computer A? If I now want to ssh from computer B to computer A, must I generat another pair of key files on computer B and copy the public file to computer A? (2) If I would like to connect a single local computer to several remote servers, is it to generate a common pair of key files only once on the local and copy the same public file to the remote servers, or to generate different pair of key files on the local for different remote servers? (3) If I would like to connect several local computers to a single remote server, when copying the public files from different local computers to the remote server, is it to combine them together into a single authorized_keys file or store them in different authorized_keys files? (4) If there are several servers shared the same file system by, for example, NFS, how to generate keys and arrange the key files for accessing from one server to the other? Also how to still generate keys and arrange the key files for a local computer to access anyone of the servers? All the machines above are Linux.Please provide examples and commands in your reply so that I can better understand how to solve the problems. Thanks and regards!

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• Is it possible to detect nearby Wi-Fi enabled devices, not necessarily on the same network? [closed]

  - by Sky

  first question on StackExchange ever. I hope I got the right board. I'm trying to create a device (either from a standard AP or some other unconventional means) that will be able to detect nearby Wi-Fi enabled devices. For example, if a cellular phone (iPhone for instance) would be carried into the secured area, its MAC address will be logged. A cellular phone is a good example because it's the most common threat that should be detected. Some important points: The detection can be either active or passive, doesn't matter. The detected device might be connected to a different network, or might not be connected to anything at all. I assume most cellular phones are actively probing when not connected, but I'm not sure. It is important to not only identify the breach, but also to identify the device (MAC address). Conventional hardware is only optional. Distance of detection is at least 6 meters (20 feet). Handling one device at a time is good. Speed of detection is important, under 5 seconds is ideal. So my question is, is this even possible? If so, what can I use in order to make this a reality? Thank you for reading!

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• Working with barcode fonts in Word

  - by Bob Rivers

  I need to create labels in Microsoft Word 2010 with numbers encoded as barcodes. The barcode's format (ean, code39, upc, etc) does not matter. I have downloaded a barcode conversion font that I found at this site. When I type the number that I want and then I format it with my new font, it produces a barcode. I then print it on an OKI laser printer (1200 dpi). The result seems to be fine, at least for common people. But, when I try to scan it, nothing happens. I tried both with a barcode scanner and a data collector, but neither of them read the barcode. My barcode scanner is working fine, because I can read commercial barcodes printed on products. Does anybody have any advice? How do I do this kind of stuff? I want to do it using Word because I will generate labels using Mail Merge. Therefore using external programs aren't option for me.

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• To update or to not update?

  - by Massimo

  Since starting working where I am working now, I've been in an endless struggle with my boss and coworkers in regard to updating systems. I of course totally agree that any update (be it firmware, O.S. or application) should not be applied carelessly as soon as it comes out, but I also firmly believe that there should be at least some reason if the vendor released it; and the most common reason is usually fixing some bug... which maybe you're not experiencing now, but you could be experiencing soon if you don't keep up with . This is especially true for security fixes; as an examle, had anyone simply applied a patch that had already been available for months, the infamous SQL Slammer worm would have been harmless. I'm all for testing and evaluating updates before deployng them; but I strongly disagree with the "if it's not broken then don't touch it" approach to systems management, and it genuinely hurts me when I find production Windows 2003 SP1 or ESX 3.5 Update 2 systems, and the only answer I can get is "it's working, we don't want to break it". What do you think about this? What is your policy? And what is your company policy, if it doesn't match your own?

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• What are some alternatives to word processing with Markdown?

  - by Hassan

  I've used MS Word-style editors for a long time, but I never got used to how unintuitive and cumbersome they are. I'm not talking specifically about MS Word, but also other editors that seem to mimic Word, like OpenOffice, NeoOffice, etc. I've found myself preferring to write in Markdown (much like on this site). I've found a few good Markdown editors, and I like using them a lot more than using Word-style editors. Here is what they generally look like: As you can see, it works much differently than a Word-style editor. This is a generally cleaner way of writing, since formatting is done right in the text, and is extremely simple to use (no highlighting some text, then clicking a button in some menu you have to find). Although editing text this way is great, I've realized that the syntax can only be used for very specific needs (bullets, numbered lists, headings and sub-headings, bold, italic, and some other common ones). However, many features are missing. Here are some features that would be nice in a word processor: Tables. Indenting paragraphs. Good image support (you can link to images, but not add them, since Markdown is just text). More simple to use than Word and its cronies. Cross-platform. Some of these can be fixed with in-line HTML, but nobody wants to do that. It seems Markdown was designed for editing text on the internet. Is there a similar setup that works better for desktop word processors?

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• Default Gateway solution on NAT'd network (best options)

  - by kwiksand

  I've recently changed a network from a bunch of machines exposed to the net on a network to a more security conscious Firewall-fronted network with a DMZ for public services. Everything's mostly working perfectly now, but I've got the old problem of NAT Loopback where a machine within the LAN wants to access a public service via the public/external IP. I've solved this problem previously in a small/SOHO environment simply using NAT loopback features of the router in use or a simple iptables rule to do the same, but I want to make sure I make the most resilient choice with the least concern. It seems I can: Use iptables as I've said to DNAT and MASQUERADE the change source/destination so the connection works correctly i.e iptables -A PREROUTING -t nat -d ip.of.eth0.here -p tcp --dport 8080 -j DNAT --to 192.168.0.201:8080 iptables -t nat -A POSTROUTING -s 192.168.0.0/24 -p tcp --dport 8080 -d 192.168.0.201 -j MASQUERADE Use split DNS, with internal mappings for public IP's Potentially do some route nastyness by setting the Default Gateway to use a different externally exposed IP to then come back in the public route (messy) Someone mentioned putting the Default Gateway within the DMZ as well (on serverfault), but I can't find the post again. I'm sure this is a common issue for many with NAT'd networks, but I've not really seen the perfect solve all when it comes to fixing this problem. What is your opinion?

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• How to migrate a running KVM (with full disk copy) to another node?

  - by klipz

  I'm doing tests on KVM, and I'd like to see if I can make a hot migration, I mean the virtual machine won't stop running during the migration (but a few seconds of freeze is ok). I use a small cluster for my test : kvm1, kvm2, and kvmnfs. kvm1 and kvm2 runs the virtual machines kvmnfs is a NFS server, and it's mounted on /KVM on both kvm1 and kvm2 To migrate a VM (only RAM in fact) from kvm1 to kvm2, I run the same kvm command on kvm2 (with -incoming tcp:0:4444) that on kvm1, then I use "migrate -d tcp:kvm2:4444" : It works great, since the VM file is common to both machines. Now, I wan't to make a full migration (RAM + disk) of a local VM file (no more NFS) of kvm1 to kvm2. I tried to create an empty file, with touch, on kvm2 and use the same kvm command line + the "-incoming ..."). Then on kvm1 I use "migrate -d tcp:kvm2:4444" : It copies everything, then... the VM fails (any I/O disk gives an I/O error) ! And my VM file on kvm2, the one I created with touch, as still a size of 0 bytes. What am I doing wrong ? What is the exact command to use on kvm2 ? And what is the command to launch, in the monitoring mode, on kvm1 ?

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• Process files in a folder that haven't previously been processed

  - by Paul

  I have a series of files in a directory that I need to carry an action out on using a script. Once the action is done, then I want to keep a log that the file has been processed, so that the next time the script is run, it does not attempt to carry out the action again. So lets say I can find all the files that should be processed like this: for i in `find /logfolder -name '20*.log'` ; do process_log $i echo $i >> processedlogsfile done So I have a file containing the logs I have processed, and my goal would be to modify the for loop such that these processed logs are not processed a second time. Doing a manual scan each time seems inefficient, particularly as the processedlogfiles gets bigger: if grep -iq "$i" processdlogfiles ; then continue; fi It would be good if these files could be excluded when setting up the for loop. Note that the OS in question is a linux derivative, a managment appliance, with a limited toolset (no attr command for example) and so no way to install additional utilities (well it is possible but not an option). Most common bash shell commands are available though. Also, the filenames and locations of the processed files must remain where they are - they can't be altered to reflect their processed status

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• Portable, battery-powered, wireless access point, ethernet adapter

  - by Jed

  I am in need of an adapter that will convert an ethernet port into a wireless access point. I have found a handful of devices, but I'm unable to find a device that is battery powered. Does a self-powered wireless access point even exist? The particular scenario that I will be using the device for is not your typical computer/PC scenario. For the curious, here's a bit of background on the problem I'm trying to solve: I make devices (controllers) that monitor water systems. Our controllers have a Webserver that serves out web pages so that users can configure the controller's settings. Typically, the user will use a cross-over cable to connect directly to the controller's ethernet port with their laptop to gain access to the controller's web pages. Now that tablets (devices that don't have an ethernet port - iPad, for example) are becoming more common, I need to find a device that will convert the controller's ethernet port into a wireless access point so that the user can connect to the controller's web pages via Wi-Fi or Bluetooth. It's worth noting that this wireless device that I'm looking for will NOT be permanently installed on the controller. It will be a portable device that the user will use on any of his controllers when he needs to make a connection to the controller. If you know of a device that will solve the scenario that I mention above, please share your info.

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• Apache, suexec, PHP, suPHP

  - by Chris_K

  While I'm quite comfortable as a Linux user, my Linux Admin-fu is a bit weak. Thus, I'm here looking for guidance with a CentOS server I'm about to build. I need to setup an Apache2 web server for a few of our clients. I want each client's web content to be under their home directory (USERDIR in apache.conf, right?) for the static HTML sites. I want Apache to run as the client (suexec?). Some of their stuff will be PHP apps and I'm under the impression I'll want to look at suphp as well then. So basically I want to look like a small version of a shared web hosting company. Considering how common those are I thought I'd easily find a nice current How-To guide on setting this all up but so far I've had very little luck. I suspect my search words are off. So the questions (feel free to answer any or all): Anyone have some solid links to current/modern guides that would help me set this all up? No, the apache documentation site is not a guide ;-) Since I have a mix of static sites and PHP apps do I want/need both suexec and suphp installed? If so, does that introduce any challenges I should be aware of? Should I be looking at other options instead of suexec and suphp? I plan to give the end users SSH, SFTP or SCP access to their stuff (if that affects anything). Thanks in advance for your help.

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• Can't resolve offline file conflicts

  - by Bryan

  We use roaming profiles on our Server 2008 R2 domain, with folder redirection for 'desktop', 'my documents' and 'application data'. But as our network is split across two sites, we have one file server at each site, which are configured to use domain based DFS namespaces and DFS replication to keep things in sync. The DFS path for the replication folder is as follows: \\domain\folderredirection$\<username>\<redirected-folder-name> The real paths are \\site-1-server\folderredirection$\<username>\<redirected-folder-name> and \\site-2-server\folderredirection$\<username>\<redirected-folder-name> As our users all switch between sites (sometimes several time per day), our folder redirection policy has to redirect to the DFS roots rather than hardcoded to a specific server. Both DFS and DFS-R have been proven to be working perfectly. On our laptops, we use offline files for the redirected folders, and this also works fine, however the problem is as follows: When conflicts occur in offline files, it is impossible to resolve the conflicts. I'm given the usual conflict resolution options (i.e. 'Ignore', 'Keep Both', 'Keep network' and 'Keep local'), however, not one of these options will resolve any conflict, yet no error is produced. We only use offline files on laptops, which have either Windows XP Professional or Windows 7 Professional installed. The problem is not specific to any one laptop, it affects every laptop and every conflicting file in exactly the same way. I would have thought the set up we have is common for companies that have multiple sites, so I'm hoping someone will have seen this before?

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• duplicity fail: not promping for password: "Running 'sftp user@host' failed"

  - by Thr4wn

  I have two linode VPS accounts and I want to back up one onto the other (the reasons are mainly for fun and to practice server administration.) the short version Duplicity isn't even asking for my password, but immediately says "invalid SSH password" (but I can ssh into the other server). why? the long version When I run duplicity /home/me scp://[email protected]//root/backup I get Invalid SSH password Running 'sftp [email protected]' failed (attempt #1) Invalid SSH password Running 'sftp [email protected]' failed (attempt #2) Invalid SSH password Running 'sftp [email protected]' failed (attempt #3) And it says Invalid SSH password immediately with no opportunity for me to actually type the password. When I type duplicity full -v9 --num-retries 4 /home/me scp://[email protected]//root/backup I get Main action: full Running 'sftp [email protected]' (attempt #1) State = sftp, Before = 'Connecting to 97.107.129.67... [email protected]'s' State = sftp, Before = '' Invalid SSH password Running 'sftp [email protected]' failed (attempt #1) I can ssh into [email protected] fine, and in fact have the ip in known_hosts before I tried any of this. serer 1 (from which I'm running the duplicity command) is Linode's default Ubuntu 8 setup with only a handful of programs installed via apt-get. server 2 (represented by x.x.x.x) is literally only Linode's default Ubuntu 8 setup I previously tried using SystemImager -- would that have changed settings in a destructive way? (I have removed and rebooted since then) Isn't Duplicity supposed to prompt for password? Am I using it wrong? are there common mistakes/dependencies I need to know about? Is there any way that x.x.x.x could be setup that could make this not work (I used Linode's default Ubuntu 8 setup and barely )?

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• Public-to-Public IPSec tunnel: NAT confusion

  - by WuckaChucka

  I know this is possible -- and apparently fairly common with larger companies that don't/can't route private addresses for overlap reasons -- but I can't wrap my head around how to get this to work. I'm playing around with pfSense, Vyatta and a Cisco 5505 right now, hardware-wise. So here's my setup: WEST: Vyatta outside: 10.0.0.254/24 inside: 172.16.0.1/24 machine a: 172.16.0.200/24 EAST: Cisco 5505 outside: 10.0.0.210/24 inside: 192.168.10.1 machine b (webserver): 192.168.10.2 So what we're trying to do is this: route traffic across the tunnel from machine A to machine B without using private addresses. i.e. 172.16.0.200 makes a TCP request to 10.0.0.210:80, and as far as EAST is concerned, it sees a src IP of 10.0.0.254. On WEST, I have your typical many-to-one Source NAT to translate 172.16.0.0/24 to 10.0.0.254 and that's confirmed to be working. Also on WEST, I have the following IPSec config: Local IP: 10.0.0.254 Peer IP: 10.0.0.210 local subnet: 10.0.0.254/32 remote subnet: 10.0.0.210/32 I have the reversed configuration on EAST. What happens when I make a request from machine A to 10.0.0.210:80 is that the SNAT translates the private address of machine A to 10.0.0.254 and it's routed out (and discarded at the other end) without establishing the tunnel. What I'm assuming is happening is that the inside interface on WEST receives a packet from 172.16.0.200 and since this doesn't match the local subnet defined in the tunnel configuration, it's not processed by the IPSec engine and the tunnel is not established. How do you make this work? Seems like a chicken and egg thing with the NAT and IPSec and I just can't wrap my head around how this can be done: can I say, "if a packet is received on the inside interface with a destination of 10.0.0.210, translate it to 10.0.0.254 before the IPSec engine inspects it"?

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• How can I enable PHP5 for a site? Having problems with every single method.

  - by John Stephens

  I'm working on a client site that is hosted on someone's DIY Debian Linux server [Apache/1.3.33 (Debian GNU/Linux)], and I'm trying to install a script that requires PHP5. By default, the server parses .php files with PHP 4.3.10-22, which is configured at /etc/php4/apache/php.ini, according to phpinfo(). On the server I can see a config directory for PHP5 adjacent to the PHP4 directory: /etc/php5.0/apache2/php.ini. I have tried multiple methods to enable PHP5 for the document root where the site's files are hosted, including all available methods mentioned here. By far, the most common suggestion I've found is to add one or both of the following lines to the site's .htaccess file: AddHandler application/x-httpd-php5 .php AddType application/x-httpd-php5 .php Trouble is, when either or both of those lines are present, the site forces my browser to download any .php files requested, without parsing the PHP at all. All of the other methods mentioned in the above article cause a 500 Internal Server Error. There is no hosting control panel I can access in a browser to enable PHP5 for the site, but I do have shell access. When I asked the server administrator about this issue, he encouraged me to search for the answer on Google. Where could I begin to troubleshoot this issue? Are there ways to test or verify the server's specific PHP5 installation and configuration, using the command line or some other method? Do you have other suggestions to enable PHP5?

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• 16TB Volumes and SNMP On Windows

  - by John K

  As volumes larger than 16TB became more common, it was recognized that the 32 bit value used to report disk size and usage within the standard "HOST-RESOURCES" MIB in SNMP was not large enough to report the proper disk size. Net-SNMP seems to have addressed this issue by simply manipulating the value of "AllocationUnits" to maintain a 32 bit value for disk utilization (since total disk size/usage is equal to the 32 bit space value times the allocation unit), to allow for the calculation of a volume larger than 8/16TB. Presuming you don't have any reporting interest in the allocation unit, this seems like a fine solution. https://bugzilla.redhat.com/show_bug.cgi?id=654384 Window's built in SNMP service, however, seems to continue to suffer from this error, simply reporting the modulo of the used/assigned disk space, resulting in inaccurate disk size reporting. Is there a way to enable Windows to correctly report disk usage for volumes over 16TB? We attempted to simply install Net-SNMP 5.5 x64 and disable Windows SNMP service entirely, however this unfortunately did not fix our issue. I've seen people in the Cacti community mention simply scripting out a solution. Unfortunately, we're using Observium for quick and basic systems monitoring. If the issue can't be correct on the Window's side, can Observium be made to report custom MIBs?

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• CentOS security for lazy admins

  - by Robby75

  I'm running CentOS 5.5 (basic LAMP with Parallels Power Panel and Plesk) and have thus far neglected security (because it's not my full-time job, there is always something more important on my todo-list). My server does not contain any secret data and also no lives depend on it - Basically what I want is to make sure it does not become part of a botnet, that is "good enough" security in my case. Anyway, I don't want to become a full-time paranoid admin (like constantly watching and patching everything because of some obscure problem), I also don't care about most security problems like DOS attacks or problems that only exist when using some arcane settings. I'm in search of a "happy medium", for example a list of known important problems in the default installation of CentOS 5.5 and/or a list of security problems that have actually been exploited - not the typical endless list of buffer overflows that "maybe" a problem in some special case. The problem that I have with the usually recommended approaches (joining mailing lists, etc.) is that the really important problems (something where an exploit exists, that is exploitable in a common setup and where the attacker can do something really useful - i.e. not a DOS) are completely and utterly swamped by millions of tiny security alerts that surely are important for high-security servers, but not for me. Thanks for all suggestions!

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• Symantec Endpoint Protection Virus Definitions

  - by Gus Denton

  I have done some Googling but I cannot get a definitive answer certainly not from the Symantec KB. I have a Virtualised Win 2003R2 server 32bit. It has been provisioned to me with Symantec Endpoint Protection 11.0.62xxx CLIENT (not a definitions server) the directory C:\Program Files\Common Files\Symantec Shared\VirusDefs is 750MB IT doesn't contain .tmp directories so it is NOT a corrupt definitions server. IT does contain directories named with a date pattern YYYYMMDD.xxx Some of these folders are 12 months old and I would like to recover the space. The sysmantect forums are full of this stuff but a lot of the postings contain links back to documents that are not specific to End Point Protection Client. It appears that I should be able to delete the older folders and all will be OK. with a service restart however there is a warning about having Live Update Administrator Installed Firstly I have no idea if I have this installed how to I check and secondly can I just ditch these old files and restart ? Regards Gus Denton Learning and Teaching Uni of New South Wales Sydney Australia For those trying to assist me I thankyou. I have followed some instructions found on the Symantec site and assumed that the response from Nixphoe would resolve my issue. It appears that as I am on a provisioned VM from a central IT unit I cannot run the Symantec commands from the Run prompt as my admin creds to get me in. (smc -stop) Basically I need to claw back some Diskspace from the c: drive which is being filed up with WSUS patches and Symantec files. I have managed to delete one symantec cache through the live update control panel and recovered 470Mb I suppose my last question for those more experienced than myself is, can I simply remove say the two oldest virus definition folders without completely foobaring the End Point protection and the server ? Regards Gus

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• Script to unstick VNC keys?

  - by MidnightLightning

  I've run into dropped key events when connecting via VNC clients, leading to a "stuck key" (usually a meta key like CTRL or ALT) and searching around the common answer on how to solve it is often "press and release each meta key individually until the problem resolves". However, I've found this to be annoying and time consuming to try and solve it this way. Plus on a bad connection, it sometimes will miss the "key up" event for the meta key again, and still keep the key stuck. So I'm looking for an automated way to do this: From a script on the client side or the server side, is there a way to trigger "key up" events for all the meta keys (CTRL, ALT, SHIFT, and WIN/CMD, both Left and Right versions)? Or just a command to release all keys the server thinks are down at the moment? Or some scripted way to at least list which keys the server end thinks are down so I know which key to keep pressing and releasing to try and release it? I've got a Mac on the server end, so a Mac/Linux solution would be needed for my situation.

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• What is the collaborative screen shot/diagramming application recently featured on Hacker News and p

  - by wonsungi

  A few days ago, I saw this video for a screen capture application. I'm pretty sure I followed a link from Hacker News, possibly to a Life Hacker article. The video was very short, but demonstrated how the application could be used: The application was basically a movable/resize-able view port with a button. When the button is pressed, the contents of the view port are saved to an image (basically a screen capture.) The interesting thing is what you could do after that point. One of the specific examples from the video browsed to Google maps street view, grabbed a photo of an intersection, then scribbled notes about where to meet and where the restaurant was in colored "marker." Another example shown was grabbing a house layout from from CAD tool, then scribbling notes on it. The last part of the video showed several possible uses being scrolled through the application's view port. Now, it seemed it was very easy to share these images with other people because there was some type of integration, either with their own site and/or common social websites/chat services. The application was shown running on both Windows and Mac. edit: I think there was an iPhone app, as well. Anyone know what this application is? I tried searching Google, Hacker News, and Life Hacker already. It is not Jing.

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• Apache logging issues

  - by Dan

  I'm trying to parse apache log files, but I'm finding some strange results and I'm not sure what they mean. Hopefully someone can provide some insight. (all of the IP addresses were altered. none actually start with 192, I didn't figure the search engines mattered though.) In the first example, multiple ip addresses are showing up in the host field: 192.249.71.25 - - [04/Aug/2009:04:21:44 -0500] "GET /publications/example.pdf HTTP/1.1" 200 2738 192.0.100.93, 192.20.31.86 - - [04/Aug/2009:04:21:22 -0500] "GET /docs/another.pdf HTTP/1.0" 206 371469 What causes this? Does it have to do with proxy servers? Is there a way to have Apache only log one? In the second example, a bunch of information is just completely missing! What would cause this? msnbot-65-55-207-50.search.msn.com - - [29/Dec/2009:15:45:16 -0600] "GET /publications/example.pdf HTTP/1.1" 200 3470073 "-" "msnbot/2.0b (+http://search.msn.com/msnbot.htm)" 266 3476792 - - - - "-" - - "-" "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; InfoPath.1)" 285 594 - - - - "-" - - "-" "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; InfoPath.1)" 285 4195 - - - - "-" - - "-" "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; InfoPath.1)" 299 109218 crawl-17c.cuil.com - - [29/Dec/2009:15:45:46 -0600] "GET /publications/another.pdf HTTP/1.0" 200 101481 "-" "Mozilla/5.0 (Twiceler-0.9 http://www.cuil.com/twiceler/robot.html)" 253 101704 My CustomLog configuration says: LogFormat "%h %l %u %t \"%r\" %s %b \"%{Referer}i\" \"%{User-agent}i\" %I %O" common

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• Cisco VPN endpoints disconnecting from a VLAN

  - by dunxd

  I have a number of Cisco ASA 5505 and PIX 506e around the world acting as VPN endpoints. They connect to a Cisco VPN Concentrator 3000 at HQ. I am using EZVPN to set up the VPN (i.e. most of the config is central on the VPN Concentrator) The majority of endpoints work absolutely fine. However, there are three that do not. 2 ASAs and 1 PIX get disconnected from one of the VLANs on our network. This is the VLAN that my monitoring server runs on - so those endpoints look as if they have gone down. However, I can still ping the endpoints from our user VLAN. If I then SSH onto the endpoint, and do a ping to my monitoring server, the connection comes back. Then after about 10 minutes it stops working again. I've looked at the configuration of my endpoints, and I can't see any significant differences. One common feature is that the affected endpoints are connecting to the internet via retail quality routers. However, I don't see how this could affect traffic within a VPN tunnel. Any ideas or suggestions? I've also got a thread on Cisco's forums at https://supportforums.cisco.com/thread/344638. One other person has reported the same problem.

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• Which Linux distribution for vehicle LCD instrument panel

  - by Brent

  I will be designing an instrument panel for a vehicle to display the common gauges that you would find in a car - (speedometer, rpm, fuel level, oil pressure, etc.). We have selected a 7" LCD and are in the process of narrowing down the hardware (This will use an ARM processor). The idea is to read these values off of the CAN Bus and update the UI with those values. This needs to have a fairly quick boot time, 5-10 seconds would be acceptable from the time the ignigtion is turned on to the time the UI is running. I have been doing a lot of research on which linux distribution to use, but I wanted to ask the question here to get the community's suggestions. I have been a .NET programmer for years, so linux is a new world to me. Here is what I have found so far... Tizen is geared for In-Vehicle Infotainment (IVI) (plus some others). However, this project is not an IVI, and I do not need the phone dialer, navigation, etc. Meego is dead, and Tizen seems to be the replacement Angstrom, Debian... would either of these be useful? I am not tied to a particular programming language or IDE. Any help and direction is appreciated!

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• How harmful is a hard disk spin cycle?

  - by Gilles

  It is conventional wisdom¹ that each time you spin a hard disk down and back up, you shave some time off its life expectancy. The topic has been discussed before: Is turning off hard disks harmful? What's the effect of standby (spindown) mode on modern hard drives? Common explanations for why spindowns and spinups are harmful are that they induce more stress on the mechanical parts than ordinary running, and that they cause heat variations that are harmful to the device mechanics. Is there any data showing quantitatively how bad a spin cycle is? That is, how much life expectancy does a spin cycle cost? Or, more practically, if I know that I'm not going to need a disk for X seconds, how large should X be to warrant spinning down? ¹ But conventional wisdom has been wrong before; for example, it is commonly held that hard disks should be kept as cool as possible, but the one published study on the topic shows that cooler drives actually fail more. This study is no help here since all the disks surveyed were powered on 24/7.

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• httpd Redirect / Rewrite .com to .org

  - by David W

  I am trying to redirect a www.example.com to www.example.org. I cannot figure out what I'm doing wrong. I have ensured that mod_rewrite is enabled in httpd.conf with: LoadModule rewrite_module modules/mod_rewrite.so I further verify this by running: httpd -M and getting rewrite_module (shared) included in the results. Later in the same httpd.conf file is the VirtualHost directive where I am trying to perform the rewrite: <VirtualHost *:80> Options +FollowSymlinks RewriteEngine On RewriteCond %{HTTP_HOST} ^example.com [NC] RewriteRule ^(.*)$ http://www.example.org/$1 [R=301,NC,L] ServerAdmin [email protected] DocumentRoot /var/www/html ServerName example.org ServerAlias www.example.org *.example.org <Directory "/var/www/html"> Options Includes FollowSymLinks AllowOverride All Order allow,deny Allow from all </Directory> ErrorLog /var/www/logs/error_log CustomLog /var/www/logs/access_log common </VirtualHost> As we can see, we are following SymLinks in the directory (which I believe is a requirement), AND we allow All Overrides (which meets another requirement). But obviously I'm still doing something wrong. Can you spot it?

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