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  • Apache2 - rewrite a bunch of specified pathname URLs to one URL

    - by James Nine
    I need to rewrite a bunch of urls (about 100 or so) for SEO purposes, and there may be more being added in the future (probably another 50-100 later on). I need a flexible way of doing this and so far, the only way I can think of is to edit the .htaccess file using the rewrite engine. For example, I have a bunch of urls like this (please note that the query string is irrelevant, and dynamic; it could be anything. I was only using them purely as an example. I am only focusing on the pathname--the part between the hostname and query string, as marked in bold below): http://example.com/seo_term1?utm_source=google&utm_medium=cpc&utm_campaign=seo_term http://example.com/another_seo_term2?utm_source=facebook&utm_medium=cpc&utm_campaign=seo_term http://example.com/yet_another_seo_term3?utm_source=example_ad_network&utm_medium=cpc&utm_campaign=seo_term http://example.com/foobar_seo_term4 http://example.com/blah_seo_term5?test=1 etc... And they are all being rewritten to (for now): http://example.com/ What's the most efficient/effective way of doing this so that I may be able to add more terms in the future? One solution I came across is to do this (in the .htaccess file): RewriteEngine on RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule ^(.*)$ / [NC,QSA] However, the problem with this solution is that even invalid urls (such as http://example.com/blah) will be rewritten to http://example.com instead of giving a 404 code (which is what it is supposed to do anyway). I'm still trying to figure out how all this works, and the only way I can think of is to write 100 more RewriteCond statements (such as: RewriteCond %{REQUEST_URI} =/seo_term1 [NC,OR]) before the RewriteRule directive. For example: RewriteEngine on RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteCond %{REQUEST_URI} =/seo_term1 [NC,OR] RewriteCond %{REQUEST_URI} =/another_seo_term2 [NC,OR] RewriteCond %{REQUEST_URI} =/yet_another_seo_term3 [NC,OR] RewriteCond %{REQUEST_URI} =/foobar_seo_term4 [NC,OR] RewriteCond %{REQUEST_URI} =/blah_seo_term5 [NC] RewriteRule ^(.*)$ / [NC,QSA] But that doesn't sound very efficient to me. Is there a better way?

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  • How to read an Excel file, get and set the information using POI

    - by user1399713
    I'm using Java to read a form that is in an Excel spreadsheet that the user fills in with information about geometric shape. Ex: Shape :_________ Color :_________ Area: _________ Perimeter:________ So far the code I have can I can read what I want in the form and print out the values of Shape, Color, Area, Perimeter. public class RangeSetter { /** * @param args * @throws IOException */ public static void main(String[] args) throws IOException { FileInputStream file = new FileInputStream(new File("test2.xls")); //C:\Users\Yo\Documents // Setup code String cname = "Shape"; HSSFWorkbook wb = new HSSFWorkbook(file); // retrieve workbook // Retrieve the named range // Will be something like "$C$10,$D$12:$D$14"; int namedCellIdx = wb.getNameIndex(cname); Name aNamedCell = wb.getNameAt(namedCellIdx); // Retrieve the cell at the named range and test its contents // Will get back one AreaReference for C10, and // another for D12 to D14 AreaReference[] arefs = AreaReference.generateContiguous(aNamedCell.getRefersToFormula()); for (int i=0; i<arefs.length; i++) { // Only get the corners of the Area // (use arefs[i].getAllReferencedCells() to get all cells) CellReference[] crefs = arefs[i].getAllReferencedCells(); for (int j=0; j<crefs.length; j++) { // Check it turns into real stuff Sheet s = wb.getSheet(crefs[j].getSheetName()); Row r = s.getRow(crefs[j].getRow()); Cell c = r.getCell(crefs[j].getCol()); if (c!= null ){ switch(c.getCellType()){ case Cell.CELL_TYPE_STRING: System.out.println(c.getStringCellValue()); } } } } What I want to do is to create a method that gets the that information and another that sets it. So far I can only print to the console

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  • How should I monitor memory usage/performance in SunOS/Solaris?

    - by exhuma
    Last week we decided to add some SunOS (uname -a = SunOS bbs-sam-belair 5.10 Generic_127128-11 i86pc i386 i86pc) machines into our running munin instance. First off, the machines are pre-configured appliances, so, I want to avoid touching the system too much without supervision of the service provider. But adding it to munin was fairly easy by writing a small socket-service (if anyone is interested, I put it up on github: https://github.com/munin-monitoring/contrib/tree/master/tools/pypmmn) Yesterday, I implemented/adapted the required plugins for our machines. And here the questions start: First, I have not found a way to determine detailed memory usage values. I get the total memory by running prtconf | grep Memory, and the free memory using vmstat. Fiddling together a munin-plugin, gives me the following graph: This is pretty much uninformative. Compare this to the default plugin for linux nodes which has a lot more detail: Most importantly, this shows me how much memory is actually used by applications. So, first question: Is it possible to get detailed memory information on SunOS with the default system tools (i.e. not using top)? Onto the next puzzle: Seeing the graphs, I noticed activity in the "Paging in/out" graphs, even though the memory graph still has unused memory: Upon further investigation, I found out that df reports that /tmp is mounted on swap. Drilling around on the web, I understood that df will display swap, but in fact, it's mounted as a tmpfs. Now I don't know if this explains the swap activity. The default munin-plugin for solaris uses kstat -p -c misc -m cpu_stat to get these values. I find it already strange that this is using the cpu_stat module. So maybe I simply misinterpret the "paging" graphs? Second question: Do the paging graphs indicate that parts of the memory are paged to disk? Or is the activity caused by file operations in /tmp?

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  • What are useful .screenrc settings?

    - by gyaresu
    Basically like some of my own that I've posted below. I'm looking for added functionality to the programme 'screen'. At the very least have a look at the last line for a fantastic 'menu bar' at the bottom of a screen session. ## gyaresu's .screenrc 2008-03-25 # http://delicious.com/search?p=screenrc # Don't display the copyright page startup_message off # tab-completion flash in heading bar vbell off # keep scrollback n lines defscrollback 1000 # Doesn't fix scrollback problem on xterm because if you scroll back # all you see is the other terminals history. # termcapinfo xterm|xterms|xs|rxvt ti@:te@ # These will let you use bind -c selectHighs 0 select 10 #these three commands are bind -c selectHighs 1 select 11 #added to the command-class bind -c selectHighs 2 select 12 #selectHighs bind -c selectHighs 3 select 13 bind -c selectHighs 4 select 14 bind -c selectHighs 5 select 15 bind - command -c selectHighs #bind the hyphen to #command-class selectHighs screen -t rtorrent 0 rtorrent #screen -t tunes 1 ncmpc --host=192.168.1.4 --port=6600 #was for connecting to MPD music server. screen -t stuff 1 screen -t irssi 2 irssi screen -t dancing 4 screen -t python 5 python screen -t giantfriend 6 these_are_ssh_to_server_scripts.sh screen -t computerrescue 7 these_are_ssh_to_server_scripts.sh screen -t BMon 8 bmon -p eth0 screen -t htop 9 htop screen -t hellanzb 10 hellanzb screen -t watching 3 #screen -t interactive.fiction 8 #screen -t hellahella 8 paster serve --daemon /home/gyaresu/downloads/hellahella/hella.ini shelltitle "$ |bash" # THIS IS THE PRETTY BIT #change the hardstatus settings to give an window list at the bottom of the ##screen, with the time and date and with the current window highlighted hardstatus alwayslastline #hardstatus string '%{= mK}%-Lw%{= KW}%50>%n%f* %t%{= mK}%+Lw%< %{= kG}%-=%D %d %M %Y %c:%s%{-}' hardstatus string '%{= kG}[ %{G}%H %{g}][%= %{= kw}%?%-Lw%?%{r}(%{W}%n*%f%t%?(%u)%?%{r})%{w}%?%+Lw%?%?%= %{g}][%{B} %d/%m %{W}%c %{g}]'

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  • Where is the TFS database?

    - by Blanthor
    I've been using TFS 2010 with no problems. I tried adding a user and I got the following error message. "TF30063: You are not authorized to access <serverName>\DefaultCollection. -The remote server returned an error: (401) Unauthorized." I remoted into the server, <serverName>, and opened the TFS Console. The logs mentioned a connection string: ConnectionString: Data Source=<serverName>\SS2008;Initial Catalog=Tfs_DefaultCollection;Integrated Security=True While remoted in I open SQL Server 2008 Management Studio opening the (local) server with Windows Authentication. It shows the connection to be (local)(SQL Server 9.04.03 - <serverName>\Admin), and there is no Tfs_DefaultCollection database. Can someone tell me what is going on? Was I wrong in connecting to this instance of the database (i.e. Is the log file the wrong place to find the connection string)? Is the database so corrupted that SQL Manager Studio cannot see it anymore, although TFS could? Should I be logging into Management Studio as user SS2008? btw I don't know of any such credentials.

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  • Replicated MongoDB server slower than simple shards

    - by displayName
    I tried to compare the performance of a sharded configuration against a sharded and replicated configuration. The sharded configuration consists of 8 shards each running on three different machines thereby constituting a total of 24 shards. All 8 of these shards run in the same partition on each machine. The sharded and replicated version is 8 shards again just like plain sharding, and all 8 mongods run on the same partition in each machine. But apart from this, each of these three machine now run additional 16 threads on another partition which serve as the secondary for the 8 mongods running on other machines. This is the way I prepared a sharded and replicated configuration with data chunks having replication factor of 3. Important point to note is that once the data has been loaded, it is not modified. So after primary and secondaries have synchronized then it doesn't matter which one i read from. To run the queries, I use an entirely different machine (let's call it config) which runs mongos and this machine's only purpose is to receive queries and run them on the cluster. Contrary to my expectations, plain sharding of 8 threads on each machine (total = 3 * 8 = 24) is performing better for queries than the sharded + replicated configuration. I have a script written to perform the query. So in order to time the scripts, I use time ./testScript and see the result. I tried changing the reading preference for replicated cluster by logging to mongo of config and run db.getMongo().setReadPref('secondary') and then exit the shell and run the queries like time ./testScript. The questions are: Where am i going wrong in the replication? Why is it slower than its plain sharding version? Does the db.getMongo().ReadPref('secondary') persist when i leave the shell and try to perform the query? All the four machines are running Linux and i have already increased the ulimit -n to 2048 from initial value of 1024 to allow more connections. The collections are properly distributed and all the mongods have equal number of chunks. Goes without saying that indices in both configurations are the same.

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  • Cacti is ignoring hash marks in interface aliases

    - by Matt Simmons
    I'm attempting to set up Cacti to monitor a router's interfaces, and I'm having trouble getting the graph templates to show the information that I'd like. Our interface configuration looks like this: interface GigabitEthernet3/6 description WalljackNumber # Server info no ip address no shutdown switchport switchport access vlan 116 switchport mode access ip dhcp snooping trust spanning-tree portfast The "Server Info" string is really just the machine name, and a short relevant description, such as "PolarSprings vmnic2". The important part appears to be that it follows the hashmark. When I run snmpwalk, I get the proper output: IF-MIB::ifAlias.230 = STRING: WalljackNumber # Server info But in Cacti, when I go into the graph templates and set the title to this: |host_description| - Traffic - |query_ifName| (|query_ifAlias|) All that shows up in the graph is: switchname - Traffic - Gi3/6 (WalljackNumber #) Which strikes me as a little weird. What I suppose MAY be happening is that somewhere in the cacti stream, it's interpreting # as being a comment and stripping everything after, but I'm not sure. I was hoping someone could tell me that this was a known documented behavior, or that I could change it in a setting that I wasn't aware of. The alternative answer is to change the delimiter from # to something else, but I've got over a thousand lit switchports on an old college infrastructure, and I'm not sure what else might be relying on them.

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  • Why are Microsoft Windows Update taking so long to install?

    - by Mathieu Pagé
    Hi, I have a question that is not related to a problem I have. Just something I'd like to understand. Why are Windows update so long? First Windows Update need to find witch updates you needs and this take about 5 minutes. What is happening behind the scene during those 5 minutes? I would have tought that it would be enough to compare the updates you already have to the complete list of updates or to check the version numbers of a couples files. Then when it comes time to install the upgrades, they're also taking a long time. Some 1 Mb updates takes 2, 3 or 5 minutes to install. What is taking so long. I would have though that it was simply a mater of backup the old file, uncompress the new files, replace the old file. This should be really fast. Is Windows doing something else? For comparison, under Linux, you can find which updates you need in about 20 seconds and installing them is usually pretty fast (The time to uncompress the files). I can do a complete updgrade of my linux machine in about 25 minutes (download 600-800 Mb of updates, hundreds of them and install them) while under windows 25 minutes is the time it needs to find witch update are needed and install about 5-10 updates. I just updated a Windows XP home from SP1a to SP3 + all other updates. It took me more than 3 hours. Doing something like that in the Linux World takes about 30 minutes. I don't want to bash Microsoft here. I genuinly want to know what they do differently that makes it so long.

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  • Format & Fresh Install Mac OS X Snow Leopard on Mac mini.

    - by sagar
    Hello Every one. I have purchased a DVD of Snow Leopard (Mac OS X 10.6.2) I purchased a Mac mini with Leopard (Mac OS X 10.5.7) I tried to install Mac OS X 10.6.2 Everything went perfectly. System was installed successfully. But the problem that I faced is as follows. System was installed but my older data remained as it is. (means installation didn't format every thing - means installation was done on upgrade basis.) Now, my system works with very low speed. Previous performance of Mac mini was double as compare to current upgrade version. Now - my question are as follows. Does an upgrade installation causes the performance issues in Mac OS X? Or is Snow Leopard too demanding for the Mac mini? ( 2 Ghz Intel Core 2 Duo, 1GB RAM - is this configuration OK for Snow Leopard? ) Does a fresh install work better than an upgrade?

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  • Choosing a new laptop

    - by chiongms
    I'm looking for a new laptop. I saw few: i) HP ProBook 4321s ii) HP ProBook 6440b iii)Dell Latitude E6410 i found these laptops are still very new..is it? not much comments about them. can anyone help? i doubt how their graphic cards perform compare to each other? ProBook 4321s- Radeon HD4350 ProBook 6440b- Radeon HD4550 Latitude E6410- NVS 3100M most of the time i'll running 3D CAD software, C++ programing...i saw my friend's laptop with radeon HD4350. it's perfectly fulfilling my demand. but i wonder how the other two are? Another thing i doubt is the screen resolution..my current laptop is 1280x800, and i found it comfortable to use. But these two HP only offer 1366x768..will it make any large different? Lastly, is there anyway to estimate how their power consumption is from the spec sheet? well, i would prefer one with longer battery usage time. my current laptop is suck...only last 1 hour even when it's still new..i'm not going to get another like this anymore. Anyone can help me please? Thanks!

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  • Identify differences between MP3 files

    - by Thingomy
    I have 2 old similar directory trees with MP3 files in them. I am happily using tools like diff and Rsync to identify and merge the files that are only present on one side, or are identical, I'm left with a bunch of files that are bitwise different. On running diff over a pair actually different files, (with -a tag to force text analysis) it produces incomprehensible gibberish. I have listened to files from both sides, and they both seem to play fine (but at nearly 10 minutes per song, when listening to them twice each, I haven't done many) I suspect the differences are due to some player in the past "enhancing" my collection by messing about with ID3 tags, but I can't be certain. Even if I identify differences in ID3 tags, I would like to confirm that no cosmic ray or file copy error issues have damaged any of the files. One method that occurs to be is finding the byte locations of the differences, and ignoring all changes in the first ~10kb of each file, but I don't know how to do this. I have on the order of a hundred or so files that differ across the directory tree. I found How to compare mp3, flac audio data in a file, ignoring header data (ID3 tag) etc.? -- but I can't run alldup due to being Linux only, and from the sounds of it, it would only partially solve my issues anyway.

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  • The bottlenecks of any computer, what to look for?

    - by WebDevHobo
    Whether it is a laptop or a desktop, any computer is made up of several pieces of hardware that communicate with each other. Sending data back and forth to ensure that the user gets the desired results. I have seen some theoretical stuff on computers & hardware, but I wonder how it all comes together. CPU RAM Graphics Card L1 CACHE L2 CACHE L3 CACHE FSB ... And all other things. Which is the biggest bottle neck? Why would a person not want/need a big value in one of those categories in certain situations? P.S.: when reading the specs of the i5 750 processor, I came across this description: In place of the FSB, one or more high speed, point-to-point buses called Quick Path Interconnect (QPI) are used, formerly known as Common Serial Interconnect Bus or CSI. QPI features higher bandwidth than the traditional FSB and is better suited to system scaling. What is this, and how does it compare to FSB? EDIT: I am not planning to buy a computer at all. The goal of this question is to understand the internal relation of various hardware pieces, their specific functions and how they work together. For instance, I have heard to a somewhat higher-than-usual amount of L2/L3 Cache can help speed up your computer. What's up with saying that? Also I forgot to mention Hard-disk RPM.

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  • Synchronizing files between Linux servers, through FTP

    - by Daniel Magliola
    I have the following configuration of servers: 1 central linux server, a VPS 8 satellite linux servers, "crappy shared hostings" I have a bunch of files that I need to have in all servers. Right now i'm copying them everywhere manually, but I want to be able to copy them to the central server, and then have a scheduled process that runs every now and then and synchronizes them (only outwardly, no need to try to find "new" files in the satellite servers). There are a couple of catches though: I can't have any custom software in the satellite servers, or do strange command line things that'll auto connect to them and send the files directly. I know this is the way these kinds of things are normally done, but the satellite servers are crappy shared hosting ones where I have absolutely no control over anything. I need to send the files over FTP I also need to have, in my central server, a list of the files that are available in each of the satellite servers, to make sure they are ready before I send traffic to them. If I were to do this manually, the steps would be: get the list of files in a satellite server compare to my own, and send the files that are missing get the list of files again, and store it in my central database. I'd like to know what tools are out there that can alleviate as much of this as possible, first the syncing, and then the "getting the list of files available in the other server". I'm going to be doing everything from PHP, not sure if there are good tools to "use FTP from PHP", which i'm pretty sure i'll have to do for step 3 at least. Thanks in advance for any ideas! Daniel

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  • Simulate SNMP traps to test surveillance

    - by jishi
    I'm trying to use Net-SNMP on Windows to emulate a trap that should trigger an alarm on our surveillance system. This is the setup: Windows 7 client that sends the trap Net-SNMP as software for sending the trap Linux with Adventnet ManageEngine OpManager as NMS (not relevant) This is what I'm trying to accomplish send trap with OID .1.3.6.1.4.1.5089.1.0.1 (according to the MIB I have loaded into my NMS) and just some sort of message into it to see if I can get any alarm in my NMS. I can see that I actually send a trap in my firewall, but I have no idea what it contains. This is my attempt so far: snmptrap.exe -v 2c -c xxxxxxx 192.168.100.65 '' 6 0 .1.3.6.1.4.1.5089.1.0.1 s "123456" However, I can't seem to find any reasonable documentation with examples for snmptrap. Basically, I need to know what: '' <- why do I need this? I can omit it and it will still send a trap 6 <- Enterprise gneric trap, I assume. Is this correct? 0 <- I have no idea, I need some sort of value for this .1.3.6.1.4.1.5089.1.0.1 <- the enterprise specific OID I assume, should this be followed by some more numbers s <- indicates string "123456" <- just a random test-string... This doesn't make much sense to me, and if anyone can shed some light on this I would be very grateful.

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  • Software mirroring (RAID1) versus "Fake Raid" for new Windows 7 install

    - by kquinn
    I've just ordered two new hard drives for my main desktop and a copy of Windows 7 Professional 64-bit. I'd like to do a clean install of Win7 onto the new drives (leaving my old XP Pro boot partition around for a while in case something goes disastrously wrong, etc.). I want to have them set up in mirrored (RAID-1) mode. My understanding is that Win7 Pro can do software mirroring, but can I set this up directly at install time? If so, how? Note that I'd like the disk to be split into three partitions (OS/Apps&Data/Bulk data), all of which should be mirrored. Would it be better (more reliable or faster) to use my motherboard's hardware RAID support? My motherboard is an older nVidia nForce 680i SLI, which is not the most stable of motherboards, and I'm not sure how trustworthy its RAID1 configuration might be (or if Win7 could even detect and install onto a hardware-mirrored volume). Also, the performance characteristics of RAID1 are rather different than RAID0 or RAID5, and I'm wondering if Win7's software mirroring might actually be faster than hardware RAID1 (for example, I'm more of a Unix admin when I have to wear the sysadmin hat, and I've had great success deploying ZFS; most hardware RAID1 implementations have to read both disks and compare results to look for data errors, but ZFS can read from only one disk in the mirror and just use the built-in checksum, meaning it can have up to 2x the number of reads in-flight, as long as there's no data corruption). Edit: Okay, my question about whether Windows 7 can do software mirroring has been answered, and it can. I'm still unsure whether Windows software RAID or my motherboard's hardware "fake RAID" function is a better choice, though. Remember, I'm only interested in mirroring -- not the more complicated striping or parity operations that generally show the poor performance of crappy motherboard RAID solutions.

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  • BIOS unable to boot CD or Hard Drive

    - by Gabriel
    Motherboard Intel DQ35MP. HDD Caviar Green 1TB. I'm having problems with my BIOS and/or hard drive/disc drive. Came back from a trip, booted my computer, and realized that the BIOS wasn't booting anymore, just a black screen with no beep sounds. Only fans and lights on. Then I thought it might be caused by the video card, I removed it, and still no BIOS screen. Then I removed the hard drive and voila BIOS screen is back again. If the hard drive is defective then I can check that with a Rescue Disk. I inserted the CD on the Disc Tray but the computer did not respond to it, the screen freezes in black with an "E7" string at the bottom right corner just after the BIOS screen, this happens with or without discs. BIOS settings are set to default, and CD reading is on top of the boot device list. EDIT I removed the BIOS battery, rebooted the CPU, the BIOS screen showed up, and then it freezed in E7. Placed the BIOS batttery, rebooted and same thing, we are stuck with the E7 string. I uploaded a video to illustrate the problem http://www.youtube.com/watch?v=13jPdBcIrBU

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  • How does one make sure or even guarantee server time are sync correctly between dozens of servers across multiple datacenter on different location?

    - by forestclown
    Currently our web applications contain a logic to check if the data sent to the web server is expired or not by comparing the timestamp of the data with the date/time of the server. Everything goes will, until some dude from data center accidentally modify one of the web server date/time and causes some disruptions in our web services. My managers are of course not happy with this, and said we shouldn't use timestamp to check expiry in the first place...anyway.... Network Time Protocol is implemented, because of data centers are spread across different continents so we have one NTP server in each data center. The servers within the data center will have cron jobs to check against the time with their NTP server from the same data center. If time is out of sync it will auto update the server date/time. But then with our managers not happy with it, and think it could still easily causes the same problem. e.g. what if someone accidentally modify the NTP date/time? what if all the NTP servers are out of sync with each other? which NTP servers we can really trust? and blah blah.. So my questions are: What are the current practice to sync date/time between servers across multiple data centers or locations? How does one manages time stamp between web apps? e.g. Server A send data (contain timestamp of Server A) to Server B (compare timestamp between Server B and the timestamp from the data to see if it has expired or not. This is to avoid HTTP replay) Should we really not use timestamp check? Thanks & Best Regards

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  • Puppet&Hiera: $variable is not an hash or array when accessing it

    - by txworking
    I wrote a puppet module and the content of init.pp was: class install( $common_instanceconfig = hiera_hash('common_instanceconfig'), $common_instances = hiera('common_instances') ) { define instances { common { $title: name => $title, path => $common_instanceconfig[$title]['path'], version => $common_instanceconfig[$title]['version'], files => $common_instanceconfig[$title]['files'], pre => $common_instanceconfig[$title]['pre'], after => $common_instanceconfig[$title]['after'], properties => $common_instanceconfig[$title]['properties'], require => $common_instanceconfig[$title]['require'] , } } instances {$common_instances:} } And the hieradata file was: classes: - install common_instances: - common_instance_1 - common_instance_2 common_instanceconfig: common_instance_1 path : '/opt/common_instance_1' version : 1.0 files : software-1.bin pre : pre_install.sh after : after_install.sh properties: "properties" common_instance_2: path : '/opt/common_instance_2' version : 2.0 files : software-2.bin pre : pre_install.sh after : after_install.sh properties: "properties" I always got a error message When puppet agent run Error: common_instanceconfig String is not an hash or array when accessing it with common_instance_1 at /etc/puppet/modules/install/manifests/init.pp:16 on node puppet.agent1.tmp It seems $common_instances can be got correctly, but $commono_instanceconfig always be treated as a string. I used YAML.load_file to load the hieradata file, and got a correct hash object. Can anybody help?

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  • How to choose the most optimal RAID settings on PE2950

    - by javano
    I have some Dell PowerEdge 2950's with 4x 15k, 150GB Cheetah SAS drives in them. They are going to be VM hosts, CentOS running ESXi with Windows Server 2k8 guests. Some guests will be hosting IIS servers, and others MSSQL servers. I am trying to set the RAID virtual disks settings and can't decide which is more optimal given this situation; Read Policy: Out of Read-Ahead, No-Read-Ahead and Adaptive Read-Ahead, the default is Read-Ahead. I will be making large sequential writes initially, writing out blank images for virtual machine hard drives (lets say 30GBs from /dev/zero for example) so Read-Ahead seems good at first. But within the virtual machines reads could be random from anywhere within their file systems as they are IIS and MSSQL servers, so perhaps No-Read-Ahead is a better idea? Now I think Adaptive Read-Ahead would be better then as a compromise but I don't know much about this option, how does it compare in performance to the others? Write Policy: write-back caching, write-through caching, the default is write-back caching. The default of write-back caching is safer than write-through caching but at a performance expense. My thinking here is that in the event of power loss for example, it seems more likely in my head (this is why I need some clarification!) that damage will occur to a guest VM with write-back caching enabled, so I should favour write-through? I have searched around and there is obviously no definitive answer, so I would like to find out what is best for my situation.

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  • Team Foundation Server 2008 - TF220056 Error during installation

    - by David
    I'm attempting to install Team Foundation Server 2008 on a Windows Server 2003 instance that exists under Hyper-V. The SQL Server database itself is held on the root partition of the Hyper-V server and has the Reporting Services installed (so I've solved the TF220059 error already). After hitting "Next " after typing the name of the SQL Server I get this error: --------------------------- Microsoft Visual Studio 2008 Team Foundation Server Setup --------------------------- TF220056: An unrecoverable error occurred while trying to check the status of the Team Foundation database. Installation cannot continue. Check the install log for more details. --------------------------- OK --------------------------- The error log's stack trace makes it look like a bug in the TFS installer itself: [03/22/10,19:14:42] TFSUI: [2] tfsdb.exe: System.IO.IOException: The directory name is invalid. [03/22/10,19:14:42] TFSUI: [2] tfsdb.exe: at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath) [03/22/10,19:14:42] TFSUI: [2] tfsdb.exe: at System.IO.__Error.WinIOError() [03/22/10,19:14:43] TFSUI: [2] tfsdb.exe: at System.IO.Path.GetTempFileName() [03/22/10,19:14:43] TFSUI: [2] tfsdb.exe: at Microsoft.TeamFoundation.DatabaseInstaller.CommandLine.Commands.InstallerCommand.get_Log() [03/22/10,19:14:43] TFSUI: [2] tfsdb.exe: at Microsoft.TeamFoundation.DatabaseInstaller.CommandLine.Commands.InstallerCommand.Run() [03/22/10,19:14:43] TFSUI: [2] tfsdb.exe: at Microsoft.TeamFoundation.DatabaseInstaller.CommandLine.CommandLine.RunCommand(String[] args) [03/22/10,19:14:43] TFSUI: [2] tfsdb.exe: The directory name is invalid. [03/22/10,19:14:43] TFSUI: [2] tfsdb.exe check failed with error code: 100 I'm running the installer as the domain Administrator, although the server is a Terminal Server in Application Mode, might that be the cause of the problems?

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  • Cable management techniques

    - by cornjuliox
    How do you manage the giant jungle of cables behind your PC? When you have 2 or more PCs next to each other, you wind up with this giant mess cables that's a pain in the neck to clean especially when both computers are running 24/7 and any fidgeting with the cables is likely to cause data loss and/or angry users. So far I've tried masking tape, cable ties and plain old string but none have been very effective. The masking tape kept the cables in place, but over time they ended up leaving this awful sticky residue on the sides of the cables that just won't come off gets all over your fingers and is horrible horrible horrible. I have nightmares about that stuff. We used cable ties and 'folded' up some of the longer cables so that they weren't any longer than they needed to be, but this meant that the position of some of our devices like the keyboard and the mouse were essentially 'fixed' until we removed the ties. The string didn't work much differently and required that we tie them properly or risk it coming loose. I would switch to a wireless keyboard and mouse, but I don't want to have to deal with the added expense of batteries, even the rechargable ones. Plus I don't want them to die on me at a crucial moment (happened to me once while playing Firearms _<). How do large offices and data centers manage their masses of cable?

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  • Cable management techniques

    - by cornjuliox
    How do you manage the giant jungle of cables behind your PC? When you have 2 or more PCs next to each other, you wind up with this giant mess cables that's a pain in the neck to clean especially when both computers are running 24/7 and any fidgeting with the cables is likely to cause data loss and/or angry users. So far I've tried masking tape, cable ties and plain old string but none have been very effective. The masking tape kept the cables in place, but over time they ended up leaving this awful sticky residue on the sides of the cables that just won't come off gets all over your fingers and is horrible horrible horrible. I have nightmares about that stuff. We used cable ties and 'folded' up some of the longer cables so that they weren't any longer than they needed to be, but this meant that the position of some of our devices like the keyboard and the mouse were essentially 'fixed' until we removed the ties. The string didn't work much differently and required that we tie them properly or risk it coming loose. I would switch to a wireless keyboard and mouse, but I don't want to have to deal with the added expense of batteries, even the rechargable ones. Plus I don't want them to die on me at a crucial moment (happened to me once while playing Firearms _<). I know that there are people out there with home/office networks a thousand times more convoluted than mine, so

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  • DNS Round-robin, Load Balancing, Load sharing, and failover in 2012

    - by user1089770
    I have been reading many posts on serverfault as well as on other sites regarding all these. What I understand is, Multiple A records(round-robin dns) can be used for both : Load sharing (round-robin, but NOT load-balancing). Many people say that “Load Balancing” but I think there will be no load-balancing because “Balance” means (literally) “compare two(or more) and adjust” (and that is what Real s/w or h/w Load balancers do) but Browsers never do this, instead they randomly select and IP and connect to it. It doesn't have any knowledge about the current load of that server (probably, the IP it picked had the highest load!). Automatic failover (latest browsers only). Yes, I think DNS can be used as a simple failover system (at least in 2012, I dont know when it actually "came in effect"). please refer to : http://webmasters.stackexchange.com/questions/10927/using-multiple-a-records-for-my-domain-do-web-browsers-ever-try-more-than-one and Browser-based DNS failover using multiple A records and http://www.nber.org/sys-admin/dns-failover.html I would like to make sure my assumptions/findings are right. So let me know please.....

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  • No apparent reason for high load average

    - by Oz.
    We have several web servers running on Amazon (ec2) c1.xlarge, over Amazon AMI. The servers are duplicates of each other, running the exact same hardware and software. Each server spec is: 7 GB of memory 20 EC2 Compute Units (8 virtual cores with 2.5 EC2 Compute Units each) 1690 GB of instance storage 64-bit platform I/O Performance: High API name: c1.xlarge A couple of weeks ago we have run a yum upgrade on one of the servers. Starting on this upgrade the upgraded server started showing a high load average. Needless to say, we did not update the other servers and we can not do so until we understand the reason for this behavior. The strange thing is that when we compare the servers using top or iostat, we can not find the reason for the high load. Note that we have moved traffic from the "problematic" server to the others, which have made the "problematic" server less crowded in terms of requests, and still his load is higher. Do you have any idea what could it be, or where else can we check? Many thanks for the help! Oz. # # proper server # w command # 00:42:26 up 2 days, 19:54, 2 users, load average: 0.41, 0.48, 0.49 USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT pts/1 82.80.137.29 00:28 14:05 0.01s 0.01s -bash pts/2 82.80.137.29 00:38 0.00s 0.02s 0.00s w # # proper server # iostat command # Linux 3.2.12-3.2.4.amzn1.x86_64 _x86_64_ (8 CPU) avg-cpu: %user %nice %system %iowait %steal %idle 9.03 0.02 4.26 0.17 0.13 86.39 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn xvdap1 1.63 1.50 55.00 367236 13444008 xvdfp1 4.41 45.93 70.48 11227226 17228552 xvdfp2 2.61 2.01 59.81 491890 14620104 xvdfp3 8.16 14.47 94.23 3536522 23034376 xvdfp4 0.98 0.79 45.86 192818 11209784 # # problematic server # w command # 00:43:26 up 2 days, 21:52, 2 users, load average: 1.35, 1.10, 1.17 USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT pts/0 82.80.137.29 00:28 15:04 0.02s 0.02s -bash pts/1 82.80.137.29 00:38 0.00s 0.05s 0.00s w # # problematic server # iostat command # Linux 3.2.20-1.29.6.amzn1.x86_64 _x86_64_ (8 CPU) avg-cpu: %user %nice %system %iowait %steal %idle 7.97 0.04 3.43 0.19 0.07 88.30 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn xvdap1 2.10 1.49 76.54 374660 19253592 xvdfp1 5.64 40.98 85.92 10308946 21612112 xvdfp2 3.97 4.32 93.18 1087090 23439488 xvdfp3 10.87 30.30 115.14 7622474 28961720 xvdfp4 1.12 0.28 65.54 71034 16487112

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  • IIS Digest repeatedly asking for authentication

    - by David Budiac
    I have a development copy of an ASP.NET intranet site checked out and running on my local machine. We're using digest authentication to allow users to log in using their active directory accounts. On my development copy only, Digest sometimes will repeatedly prompt for login information usually ~9 times per page request. After repeatedly logging in (or it also works to cancel out of 8 out of the 9 prompts), I can use the site as normal. I cannot pinpoint what is triggering the issue. Sometimes this problem triggers upon the next page request, sometimes after I edited/saved/refreshed a page, and sometimes it doesn't happen at all. Each prompt triggers several logon (Event ID 4624 & 4672) security events in the Events Viewer. Shortly after each burst of logon events, I'll see a burst of logoff events (Event ID A co-worker who has a nearly an identical setup (Windows 7, IIS 7) is not experiencing the issue. Our production copy (that is running on a different server) also does not experience the issue. We've tried to compare our settings in IIS, not really finding any differences. I'm using chrome but I've experienced the issue in other browsers.

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