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• What kind of server configuration is best for a chatting app? [closed]

  - by mohabitar

  I'm just now starting to go deeper into the world of cloud hosting and databases, and am getting overwhelmed by how deep this information goes. It's all a little too much to consume in a short amount of time. I get a lot of pricing information, but I'm unable to determine what that means to me. I'm making what you might compare to an email app. Users can send messages to one another. I just don't understand, out of the several options, what would be ideal for an app like this, where users would be constantly sending and receiving text data. With Amazon DynamoDB, I have to specify a pre-defined throughput with number of reads and writes per second. Sure I can just type 50, but I'm not exactly sure what 50 writes per second represents. I'm trying to determine what would be the most cost efficient solution, and I want to know what a throughput of 50 reads/writes/second compares to. Is that a high number? What is a good throughput number for a message sending app with say 50,000 daily users? I'm just providing specific numbers so I can understand what these throughput numbers represent. 100 transactions/second to me seems like a small number since I'm not familiar with this stuff, so I'm just looking to bring everything in context. What would 100 read/write/second be useful for? Are there any average example values available? And I'm not sure what each service is good for. For a message sending app, is there any reason I'd want to choose say Amazon DynamoDB over Google App Engine? Any insight would be greatly appreciated.

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• is there a way to run a command before puppet implements a change?

  - by Patrick

  I want to have puppet run a specific command before performing any type of change. I am aware of the prerun_command option in the main puppet.conf, but this is not what I'm looking for. I want the command to only run if something is about to change, not on every puppet run. Here's the scenario. Let's say I have a bunch of web servers behind a load balancer. I then want puppet to update the web site files. But in order to prevent issues where some files have been updated, but other files haven't, and the mixed versions causing problems, I want to take the server out of the load balancer pool. I could write a script which when run will tell the load balancer to remove the box from the pool. Then puppet can do the change, and use postrun_command to put the box back in the pool once complete. But I need a way to run that script to remove the server from the pool. The only solution I can think of is to keep 2 copies of the files on the box. One a staging copy, and when puppet updates that, use a notify action to trigger the removal script, and then copy from staging into the live location. But I was hoping for something a little more generic that would work on any change being performed (upgrading a package, restarting a service, creating a user, anything).

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• Getting PAM/user info into php - something like Net_Finger instead of a db?

  - by digitaltoast

  I've got a very small user group who just need to login, upload, check and then move specific files to a different area when ready. Right now, I use the nginx PAM auth module to log them in against their unix accounts. As their login is their home directory, I've already got the info to send the uploads to the right area - one line of php and no database needed. But I'm maintaining a separate DB just so PHP can welcome them, grab their email and send them an email when processed. Yes, sure I could use nosql or sqlite instead so as to not need a whole mysql install. But it occurred to me that as I've got all these blank user fields for phone numbers I could populate with any data, that I could use something like php's Net_Finger. Which failed for me with: sudo pear install Net_Finger Starting to download Net_Finger-1.0.1.tgz (1,618 bytes) ....done: 1,618 bytes could not extract the package.xml file from "/build/buildd/php5-5.5.9+dfsg/pear-build-download/Net_Finger-1.0.1.tgz" Download of "pear/Net_Finger" succeeded, but it is not a valid package archive Error: cannot download "pear/Net_Finger" At which point I thought I'd stop, and take a ServerFault reality check - is this a really bad/dangerous/stupid idea just to stop me having to maintain details in two places rather than one? It there a better way? Googling shows that it's not an oft-asked thing, so perhaps with good reason?

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• What are possible results/side effects if replication between DC's in a Windows domain is unable to occur?

  - by hydroparadise

  There's plenty of administration literature out there how to properly manage Windows servers. But in dealing with real life, things don't always occur like you want them to. In Microsoft's Windows Server 2003 Administrator's Companion, out of 1400+ pages, theres only one page that I could find when it comes up setting up additional domain controlers. They make it sound seemless and don't reveal a whole lot on what happens if "peer" DC's are unable to replicate. Down to the specific issue at hand, we had a DC go down about a month ago due to a bad RAID controller. There was nothing critical that waranted imediate attention, so bringing it back up got put on the back burner. A month later, we get the DC back up and running and everyting seemed ok. The next day, nobody is able to logon complaining that the "user does not exist" or "unable to establish a trust relationship". Knowing that I had just put the downed DC back on the network, I immediately took it back off the network and had everybody restart the workstations. After that, exchange was fine, shares became available, and everybody was able to log in. After doing some event log swimming, it would appear that everything started due to replication issues on the SYSVOL. I've read where you can force replication, but that would mean putting it back on the network. I am afraid to put the DC back on the network in fear that something else could go wrong. So, what other issues could one expect to run into where two DC's are unreplicated for over a month?

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• mysqldump --where with = operator doesn't get all rows = - Help!

  - by JonathanLIVE

  I have a situation with a particular table that now thinks it contains 4 Petabytes of data. I know that sounds cool, but I assure you, it is only on a 60GB partition. This table has 9 fields in it. One of them is a domain_id field. It is the best field to identify the rows by, as there are only approximately 6300 of them. The only other field option to match has over 2million records, and thats just more difficult. I cannot do a straight mysqldump because it will attempt to output all 4PB of data and fill the drive long before it gets close to that, so I need to surgically remove the good stuff, destroy the db, and recreate it. I believe if I can do a dump for each domain_id record, then I will get most of the usable data out of it. This is what I am trying to use: mysqldump -u root --skip-opt -q --no-create-info --skip-add-drop-table --max_allowed_packet=1000000000 database table --where="domain_id=10" domains10.sql Using this I expect every row with the domain_id 10 to be exported. However, when I check the export, I am only getting 1 row, when however I look at the db, there are many many rows. It is as though the operator just finds one, then gives up. I have tried various operators. Using the < or I am able to get more of the data, but the export stops short at certain rows where the data has been compromised. With over 6000 to go through, I can't narrow down which rows are being affected in the export easily enough. So, what I need is an operator that will basically do what I thought = would do, simply give me an export of all records that match the specific field. Also note, the only way I got this DB even accessible is through an innodb force recovery 3. So I need to get this right, because after this is done, I have to drop the db in order to make mysql functional again. Looking forward to any helpful answers.

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• Windows 7: resizing the 'Save As' window

  - by Mark Miller

  I do not know whether my question is appropriate for this forum. Apologies if it is not. I am running Windows 7 Professional with Service Pack 1 on a Dell Vostro 460 PC. I am downloading journal articles from the internet and saving them as *.pdf files. Somehow I unintentionally clicked a button that resulted in the 'Save as' window filling the entire screen of my computer, except for the toolbar at the very bottom. How can I resize the 'Save as' window so it only fills perhaps somewhere around 25% of the computer screen, or whatever the default size for that window is? I have searched the internet extensively and found one or two threads about this problem, but no specific solutions were posted there. One suggestion was to grab the bottom of the window with the mouse and scroll upward until the window was the desired size. That does not appear to be possible in my case. Another suggestion was to click on the window with the middle mouse button before attempting to resize the window, but that does not appear to help in my case either. Thank you for any help. If I should post this question in a different forum here please let me know, or kindly migrate the question to the appropriate forum. If additional information is necessary before a solution can be attempted, please let me know that as well.

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• Giving the root user priority to maintain Debian (while server collapsing under heavy load)

  - by Saix

  Is there any way to setup Debian to prioritize any or specific root's activity before every other? For instance, several times per year something gets wrong (usually man's fault by overstressing apache/mysql) and system gets unresponsive under heavy load like 200 (8-core cpu). I know there are limits for php scripts to run then kill, but that's not the way because this limit has to be at least 45 minutes long. The problem is, until I'm able to login via SSH and let apache/mysql restart under this server stress, it nearly hits these 45 minutes anyway. Also hardware restart causing usually to run fsck at boot time on all harddrives since it's usually pretty long the box haven't been restarted. I was told it's really not good idea disabling fsck but then again, it takes more then hour to complete. What is the fastest way to restart apache/mysql? Is there any way to give ssh users or root user higher priority so the logging in and completing these restarts (rather stops though) commands wouldn't take so long? One comes to my mind.. use NICE for apache/mysql but no way. I can't risk limiting those two vital apps 24/7 or could I? I'm a little bit scared if any other system process wouldn't slow the pages down too much. Any backup process, swap (if any) etc. There is pretty heavy PHP framework with 20k visits a day, so it needs every hw/sw resource available. I can't throttle it the whole time, just in certain points when system gets unresponsive, so I could maintain it.

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• Centralized backup method recommendation for SMEs with various OSes

  - by Akinator

  Hi I was wondering what in your opinion is the "best" method for having "everything" backed-up in the following situation. We are a SMEs with 10 computers in total. Three of those computers are MACs The rest are windows (1 vista, 4 win7 and 2 XPs) I'm very open to what the method should be but you should also consider the follwing: Very limited resources Quite "small" bandwidth (4 MBs for all (download) 0.4 MBs (upload, yep, thats it)- though this might get, a little bit better) One of the main thing to back up would be the mails, considerations: All windows computers use outlook, mainly 2003 There is one mac that uses outlook too (for mac of course - not 2011 yet) We also have to backup the files: Not a huge amount Very few very big files Very organizes (by machine) What I would like is to hear your opinions as to which would be the best method (or combination of methods - preferably one of course) considering. We are not sure what do we need and I'm open to suggestions, though an online (cloud based applications) would be great, remember the the bandwidth is unbearable. Last think to consider, it that we would like to do weekly updates (unless the method is very easy of course). Thanks in advance!! I tried to be as specific as possible, but if anything is needed I'll gladly update, please ask for any clarification needed! Please avoid any answers like upgrade all to windows 7 and throw away your macs :) our's may not be an ideal situation, but it is what it is, and right now, it would be impossible for us to change it for a lot of circumstances.

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• .lnk doesn't open, no errors

  - by MushinNoShin

  I have a shortcut (.LNK) on my desktop to a MS Access database out on a network drive. When I double click that shortcut I get an hour glass for about 10 seconds and then nothing. No errors, no access opening, nothing happens. It appears as if there's not even an MSAccess process running in the background. The file successfully opens from: The Open dialog in Access The commandline "C:\path\to\MSACCESS.EXE C:\path\to\shortcut.lnk" The commandline "C:\path\to\MSACCESS.EXE C:\path\to\whatTheShortcutPointsTo.mdb" The file silently fails to open from: Double clicking the shortcut.lnk Double clicking the mdb file that shortcut.lnk targets At first I thought it had to do with how the link handler operated but the fact that it does the same exact thing when I try to open the mdb directly in explorer makes me think it's an issue with explorer. I've tried restoring, deleting, and recreating the association with the extension. I've tried running MSACCESS.EXE /regserver. I've run out of things to throw at it. In case this is specific to MS Access 2007; I'm trying to use 2007 :)

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• Timestamp Updating Constantly on /dev/null

  - by motorleague

  I've been working on a problem with a /dev/null file on an AIX system (just for background it looks as though it was inadvertently deleted and recreated as a normal file by somebody), but in trying to determine what caused the problem, I noticed that the timestamp on it seems to update every minute. I've observed this on several AIX servers at my workplace. At present I can't entirely rule out this be something specific to the Application being used at my workplace, so I compared with CentOS and Debian based computers at home last night. The CentOS box, which runs 24 hours, had a mod time on /dev/null of around 4 days ago (during which time it was essentially just being used as a web browser and multimedia player, although it would have had active but essentially unused Apache, MySQL and VMM processes running in the background). The timestamp on /dev/null on the Debian machine, which was a just booted laptop, pretty much reflected the boot time, but I tested redirecting STDIN from, and STDOUT to it, and the modification time was unchanged (I'm not sure 100% sure if directing data to /dev/null constitutes "writing to it" in the way it would a normal file). So my question is essentially, could anybody please offer any advice with regards to what circumstances (permissions changes etc.. aside) might cause the timestamp on /dev/null to update? Thanks very much for any suggestions. Alex.

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• Ping not working

  - by Nishant

  Ping is not working to and from this IP to my computer. inet addr:10.125.104.4 Bcast:10.125.111.255 Mask:255.255.240.0 My computer is like this Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : IP Address. . . . . . . . . . . . : 10.125.65.75 Subnet Mask . . . . . . . . . . . : 255.255.252.0 Default Gateway . . . . . . . . . : 10.125.64.6 We both CAN reach the common gateway IP , 10.125.96.6 . What should I check ? What is the barrier in sending info if we both have a common gateway that is pingable ? Besides I can login to a intermediate server and ssh to this server also !!

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• Does anyone know the touchpad disabling driver for Dell xps 14?

  - by rkar

  I accidentally deleted my Dell xps 14 touch pad disabling driver and I don't know where to find it and reinstall it. I have already tried Dell support and without luck (I don't want to install something that I don't know). Would anyone please send me the link to that driver To clarify: There is this Fn shortcut key used to disable/enable touch pad in Dell xps14 and when press it orange light on touch pad will lit and touch pad will stop working. But after deleting the driver that responsible for that function,it stopped working. My service center is almost 600 miles away and he said that he forgot to add it last time he fix my laptop. Since the internet connection at his place is slow,he can't send me from mail either.So can anyone send me the link for that driver. Since I don't really know about drivers it would be really nice if some one show me the driver name or link. Sorry,here is my laptop service tag "C37KWL1".I don't know how to find the specific driver for that function key.My dell has a short cut for disabling touchpad with picture on it along with the other multimedia short cut key with picture. since xps 15 and 17 have seperated touch key instead of on function keys mine have to choose function key or multimedia key through setting.To be honest my service center tech guy forgot to install it when he repair it and can't send me the file(which is about over 20mb or something according to him)for some reason.All i need is that particular file.

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• Route all traffic of home network through VPN

  - by user436118

  I have a typical semi advanced home network scenario: A cable modem - eth A wireless router (netgear n600) eth and wlan A home server (Running ubuntu 12.04 LTS, connected over wlan) A bunch of wireless clients (wlan) Lying around I have anoher cheaper wlan router, and two different USB wlan NIC's that are known to work with Linux. ACTA struck. I want to route ALL of my WAN traffic through a remote server through a VPN. For sake of completition, lets say there is a remote server running debian sqeeze where a VPN server is to be installed. The network is then to behave so that if the VPN is not operative, it is separated from the outside world. I am familiar with general system/network practices, but lack the specific detailed knowledge to accomplish this. Please suggest the right approach, packages and configurations you'd use to reach said solution. I've also envisioned the following network configuration, please improve it if you see fit: ==LAN== Client ip:10.1.1.x nm:255.0.0.0 gw:10.1.1.1 reached via WLAN Wlan router 1: ip: 10.1.1.1 nm:255.0.0.0 gw: 10.10.10.1 reached via ETH Homeserver: <<< VPN is initiated here, and the other endpoint is somewhere on the internet. eth0: ip:10.10.10.1 nm: 0.0.0.0 gw:192.168.0.1 reached via WLAN Homeserver: wlan0: ip: 192.168.0.2 nm: 255.255.255.0 gw: 192.168.0.1 reached via WLAN ==WAN== Wlan router 2: ip: 192.168.0.1 nm: 0.0.0.0 gw: set via dhcp uplink connector: cable modem Cable Modem: Remote DHCP. Has on-board DHCP server for ethernet device that connects to it, and only works this way. All this WLAN fussery is because my home server is located in a part of the house where a cable link isnt possible unfortunately.

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• Automatically reconnect to VPN when it drops

  - by IAmAI

  I use OpenVPN to connect to a VPN service. I will often use it unattended and on occasion I have come back to find the service disconnected and GUI asking for login credentials. If the connection is disconnected by the service, and not me, I'd like it to attempt to reconnect automatically with no intervention from me, and ideally, if the reconnection attempt initially fails, keep attempting to do so at regular intervals until a connection is successfully. Is there anyway to configure OpenVPN to do this? If not, can someone suggest a way of doing it with scripting (I use Windows)? Failing that, can anyone suggest a VPN solution that does this? The VPN provider supports PPTP as well as OpenVPN. I have configured OpenVPN to read login credentials from a file. Below is my config script. I have censored any details specific to the VPN provider. client dev tun proto tcp remote ???.???.??? 0000 resolv-retry infinite nobind persist-key persist-tun ca ???.???.??? verb 3 mute-replay-warnings float reneg-sec 0 auth-user-pass auth.conf auth-nocache Thanks for your help.

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• Having an issue trying to get Gigabit speed across my network (Ubuntu Server)

  - by user94217

  I've just started looking into the network speeds at my office, the entire network is setup to be "Gigabit". This includes Gb switches, Gb Network cards and Cat 5e cabling. I'm not expecting the full speed, I just want more than ~90 Mb/s. I've been running some tests with iperf the linux tools and checking the hardware with ethtool. I have 3 servers and when doing my checks/test I discovered that the two backup servers can access each other at around 450 Mb/s but when using either one of them to connect and test the main server, I only get the 90Mb/s even though ethtool shows the networking card running at 1000/Full. The only difference between all the server/networking cards is the "Port" which ethtool shows. On the two backup servers the "Port" is shown as MII yet on the other it's shown as "Twisted Pair". When using ethtool -s to manually set the "Port" to MII on the main server, it looses all connectivity and does not show "Speed" or "Duplex". Anyway, Am i doing something wrong? Is there a specific reason my main server cannot use Gb when there appears to be no difference except the "Port"?

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• IIS 6.0 https not working "connection was reset"

  - by cad

  Application Server Windows Server 2003 SP2 with IIS 6.0 IIS has a "Default Web Site" (port 18000, ssl 443, ID=1) with a certificate created by me. I have an specific site called "scj.galaxy.Weekly" (port 80, ssl 443, ID=1272369728) that is working fine. I have an entry in windows/system32/drivers/etc/hosts that links galaxy.Weekly.scjdev.ds to the server ip in both my local machine and in the application Server. These sites works: http://scj.galaxy.weekly/test.html works http://scj.galaxy.weekly/test.aspx works But https://scj.galaxy.weekly/test.html fails Error message is: The connection was reset The connection to the server was reset while the page was loading. The certificate was working fine for months. It was created with something similar to this: Selfssl /N:CN=*.scjdev.ds /V:3650 /S:1 /P:443 I have tried several options and none of them are working: 1) Create a certificate only in "Default Web Site" and link it to SecureBindings with command prompt cscript adsutil.vbs set /w3svc/1272369728/SecureBindings ":443:galaxy.Weekly.scjdev.ds" 2) Create a certificate only in "Galaxy Site" and link it to SecureBindings 3) Create a certificate in both and link them to secureBindings. Probably I am missing an step or something, but I can't see it. Here is the relevant config of Galaxy Site: <IIsWebServer Location ="/LM/W3SVC/1272369729" AuthFlags="0" LogPluginClsid="{FF160663-DE82-11CF-BC0A-00AA006111E0}" SSLCertHash="c36a514a0be90fbc121d9c19bb052842289d5aee" SSLStoreName="MY" SecureBindings=":443:galaxy.Weekly.scjdev.ds" ServerAutoStart="TRUE" ServerBindings=":80:galaxy.Weekly.scjdev.ds" ServerComment="galaxy.Weekly.scjdev.ds" > </IIsWebServer> <IIsWebVirtualDir Location ="/LM/W3SVC/1272369729/root" AccessFlags="AccessRead | AccessScript" AppFriendlyName="Default Application" AppIsolated="2" AppRoot="/LM/W3SVC/1272369729/Root" AuthFlags="AuthAnonymous | AuthNTLM" DefaultDoc="Default.aspx" DirBrowseFlags="EnableDirBrowsing | DirBrowseShowDate | DirBrowseShowTime | DirBrowseShowSize | DirBrowseShowExtension | DirBrowseShowLongDate" Path="D:\Webs\Galaxysite" ScriptMaps="some config... " > </IIsWebVirtualDir>

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• IPTables Reroute SSH based on Connection string?

  - by senrabdet

  We are using a cloud server (Debian Squeeze) where public ports on a public IP route traffic to internal servers. We are looking for a way to use IPTables and ssh where based on some part of the ssh connection string (or something along these lines) iptables will reroute the ssh connection to the "right" internal server. This would allow us to use one common public port, and then re-route ssh connections to individual servers. So, for example we hope to do something like the following: user issues ssh connection (public key encryption) such as ssh -X -v -p xxx [email protected] but maybe adds something into the string for iptables to use iptables uses some part of that string or some means to re-route the connection to an internal server using something like iptables -t nat -A PREROUTING ! -s xxx.xxx.xxx.0/24 -m tcp -p tcp --dport $EXTPORT -j DNAT --to-destination $HOST:$INTPORT ....where $HOST is the internal ip of a server, $EXTPORT is the common public facing port and $INTPORT is the internal server port. It appears that the "string" aspect of iptables does not do what we want. We can currently route based on the IP table syntax we're using, but rely on having a separate public port for each server and are hoping to use one common public port and then re-route to specific internal servers based on some part of the ssh connection string or some other means. Any suggestions? Thanks!

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• What are the advantages of registered memory?

  - by odd parity

  I'm browsing for a few low-end servers for a startup and I'm a bit confused about the different memory types. The advantage of ECC is clear - single-bit error correction. When it comes to registered memory it seems more vague, especially in systems that support both registered and unbuffered memory. A Google search mostly finds copies of the Wikipedia article, which states that registered memory chips "...place less electrical load on the memory controller and allow single systems to remain stable with more memory modules than they would have otherwise". However I can't find any quantification of this. What I'm wondering about is: Is registered memory an improvement over unbuffered when it comes to soft error rate, or is it purely about the maximum number of modules supported? If yes, at what point (amount of modules or GB of memory) do these improvements start to become noticeable? For a specific example, the HP ProLiant DL 120 G6 server manual states that maximum supported memory configuration is 16 GB unbuffered (4x4GB) or 12 GB registered (6x2GB). In this case I'd rather have the extra 4GB of memory if the reliability difference is negligible.

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• Should I update the kernel on a Linux machine?

  - by Legate

  As I understand it, updating to a new kernel (with the normal linux-image... package, not by rolling my own) requires a server restart. However, one of our servers (Ubuntu 10.04) is running several extensive screen sessions. Restarting kills those which is always a major hassle to their owners (mostly because of lost session histories). What should I do? I see several possibilites: Not doing anything, that is update only non-kernel packages (perhaps use apt-pinning?) Update the kernel, but not restart. (Is that smart? I seem to remember there might be some problems with loading kernel modules.) Updating the kernel and restarting. Is there perhaps some way to preserve the screen sessions? I guess it ultimately boils down to this question: How important is it to update the kernel? I posted this question here instead of askubuntu.com as I think this is not an Ubuntu-specific issue though this server is running Ubuntu.

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• Unable to connect to SQL Database (can the password be reset)

  - by user45450

  I have recently joined a company which has an SQL 2005 Server running a few databases. The server looks like no one has touched it in a couple of years and has this week it ran out of disk space. After a quick hard drive scan it looks like some of the databases have become a little bloated and particularly the Sharepoint_config~*~_log and WSS_Content_log.ldf have grown to about 15GB. I have been able to log into a couple of the other databases and use the shrinkfile command to free up disk space but for some reason I am unable to log into the sharepoint and Microsoft#SSEE databases (which gives me the "cannot connect to Sharepoint, a network related or instance specific error occurred..." when I try and connect) I can see that the database is running via the SQL surface configuration and I have made sure that the remote connection settings allow me to connect locally but I am still unable to log in either with windows authentication or locally. Is there any way to reset or recover the database login details so I can get in? ( I have tried logging in with all the administrative passwords I can find and after tracking down the company who installed it in the first place I found out that they have no idea what the password could have been)

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• running a laptop continuously

  - by intuited

  I have an experienced laptop — a Dell Latitude D400, with a Pentium M CPU — that I'd like to run as an always-on server. This model was launched in 2004; I got mine second-hand in about 2007. I've heard that continuous operation is generally not a good idea with consumer hardware, but am lacking in specific knowledge about related problems, and have little idea of how much such usage patterns would reduce the lifespan of the machine. I'm mostly concerned with the unit's core components; parts such as the hard drive which are readily replaceable are, well, readily replaceable. What sorts of things can I do to increase the lifespan of this machine under such circumstances? For example, I'm guessing that it would be wise to limit the CPU frequency or take other steps to keep the internal temperature low. However, I'm not sure where the point of diminishing returns would lie with such an approach — 50°C? 40°C? Would it be useful to suspend the machine periodically, for perhaps an hour each day, or a few hours each week?

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• Identifying test machines in analytics logs

  - by RTigger

  We're just beginning to add analytics to our SaaS application, to begin (among other things) billing clients based on usage. The problem we're running into is there's a few circumstances where our support team will simulate a log in into production to try to reproduce reported issues with a client's configuration. When they log in, an entry will be made into our analytics logs that their specific account has logged in, which we use to calculate billing. A few ideas we had to solve this: 1) We log IP addresses as well as machine keys for each PC that logs in - we could filter out known IP addresses and/or machine keys belonging to support. The drawback is we have to maintain a list of keys / addresses manually. 2) If support (or anyone else internal) runs our application in debug mode (as opposed to release), it will not report analytics. This is fine, as long as support / anyone else remembers to switch to debug mode. 3) Include some sort of reg key / similar setting required to be set when configuring a production system in order to send analytics. Again, fine, as long as our infrastructure team remembers to set the reg key or setting. All of these approaches require some sort of human involvement, which we all know can be iffy at best. Has anyone run into a similar situation? Is there an automated approach to this problem? (PS Of course, we shouldn't be testing in production, but there are a few one-off instances with customer set up that we can't reproduce without logging in as them in production. This is the only time we do so, and this is the case I'm talking about in this question.)

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• How should an experienced Windows SysAdmin learn Linux? [closed]

  - by Systemspoet

  I have a new hire starting in a few weeks who is an experienced Windows SysAdmin. I think he's fairly senior on the Windows side, with a pretty deep AD understanding and experience with Exchange 2007, 2010, and exchange migrations. He's done a little PowerShell but I suspect more of the "run this command to do this" variety then "write a script to do this" sort. However, we are a mixed shop and (he knows this) I expect him to become a reasonably competent Linux SysAdmin over time. I'm looking for good starting points to bring him along. I have over ten years of Linux/UNIX experience, so it all sort of seems intuitive to me, but I've been thinking about the toolkit you actually need to be productive in the Linux CLI world. Just to be able to use the machines at all, off the top of my head... vi Basic CLI stuff -- move around, rename files, copy files, tar, gzip, changing passwords, finding relevant manpages, keep track of where you are, find things in your history, etc, etc. More advanced things that I take for granted but are actually pretty hard -- doing things with 'find', extracting relevant text via 'awk' and/or 'cut', knowing when to use 'grep' and when to use 'grep -e' or 'egrep'. Distribution specific stuff... compiling software, rpm, yum, apt-get, you name it. This all seems pretty basic to me, but when I think back to 1995 when I was first learning my way, some of those things took me years to master. So my question is -- where should I send him to pick up those skills? I'm not just thinking of classes, but rather also websites and books? Where do you all suggest as a starting point for picking up Linux skills?

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• Cisco ASA 5505 network route for static IP hosts

  - by TheCapn

  I've configured my internal VLAN using the most basic settings where ports 1-7 are assigned from a pool of addresses in the range 192.168.15.5 - 192.168.15.36. These hosts are given access to the internet and it works great. What I'm trying to set up now is allowing users who are connected to the device and specify their IP (say I connect and request 192.168.15.45) are given internet access and can still work alongside DHCP hosts. Those with a DHCP assigned address are blocked from the internet. Mostly the issue resides in that I am very new to working with the device. I feel that the solution is easy but I'm not looking in the right spots and don't have the correct terminology down to google it. Do I need to define access control lists? Group policies? a new VLAN? The rules that are set up seem to be specific to the entire /24 subnet but when I request a static IP outside of the DHCP range I get blocked from other hosts and the internet.

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• Locate devices within a building

  - by ams0

  The situation: Our company is spread between two floors in a building. Every employee has a laptop (macbook Air or MacbookPro) and an iPhone. We have static DHCP mappings and DNS resolution so every mobile gets a name like employeeiphone.example.com, every macbook air gets a employeelaptop.example.com and every macbook pro gets a employeelaptop.example.com on the Ethernet interface (the wifi gets a dynamic IP from a small range dedicated for the purpose). We know each and every MAC address of phones and laptops, since we do DHCP static mapping (ISC DHCP server runs on linux). At each floor we have a Netgear stack of two switches, connected via 10GB fiber to each other. No VLANs so far. At every floor there are 4 Airport Extreme making a single SSID network with WPA2 authentication. The request: Our CTO wants to know who is present at which floor. My solution (so far): Every switch contains an table listing MAC address and originating port. On each switch stack, all the MAC addresses coming from the other floor are listed as coming on port 48 (the fiber link). So I came up with: 1) Get the table from each switch via SNMP 2) Filter out the ones associated with port 48 3) Grep dhcpd.conf, removing all entries not *laptop and not *iphone 4) Match the two lists for each switch, output in JSON or XML 5) present the results on a dashboard for all to see I wrote it in bash with a lot of awk and sed, it kinda works but I always have for some reason stale entries in the switch lookup tables, making it unreliable; some people may have put their laptop to sleep, their iphones drop connections after a while, if not woken up and so on..I searched left and right, we are prepared to spend a little on the project too (RFIDs?), does anybody do something similar? I can provide with the script if needed (although it's really specific to our switches and naming scheme). Thanks! p.s. perhaps is this a question for stackoverflow? please move if it so.

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