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  • Cannot delete old NFS directory: Device or resource busy

    - by Jakobud
    On server1, we had an NFS share mounted from server 2 like this: /nfs/server2/share Recently, we took down server2 to install a new OS on it. Now we can't get NFS setup the way it was. When I do this: ls -l /nfs I get this: drwxr-xr-x 2 root root 0 2010-03-15 09:59 server2 Notice how the directory size is 0 instead of 4096 like usual? Anyways I go into server2 expecting to see a share directory, but I don't. It's empty. So therefore I cannot mount my share at /nfs/server2/share. When I try to create /nfs/server2/share directory, I get mkdir: cannot create directory `share': No such file or directory I think this is because it doesn't really think the /nfs/server2 directory really exists. Even if I use the -p option with mkdir, it doesn't work. Next I tried to remove /nfs/server2 so I could just recreate it. I try to rm -r /nfs/server2 but I get rm: cannot remove directory `/nfs/server2': Device or resource busy So now I'm at a loss. I need to mount this NFS share in the same exact place on server1 (at /nfs/server2/share) because other software on server1 depend on this. But if I can't create that share directory and I can't remove that directory, what do I do? Also, just for testing, I attempted to mount the share at /nfs/testing/share and it mounted just fine. But like I said, I need to mount it back in the same location.

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  • Can compressing Program Files save space *and* give a significant boost to SSD performance?

    - by Christopher Galpin
    Considering solid-state disk space is still an expensive resource, compressing large folders has appeal. Thanks to VirtualStore, could Program Files be a case where it might even improve performance? Discovery In particular I have been reading: SSD and NTFS Compression Speed Increase? Does NTFS compression slow SSD/flash performance? Will somebody benchmark whole disk compression (HD,SSD) please? (may have to scroll up) The first link is particularly dreamy, but maybe head a little too far in the clouds. The third link has this sexy semi-log graph (logarithmic scale!). Quote (with notes): Using highly compressable data (IOmeter), you get at most a 30x performance increase [for reads], and at least a 49x performance DECREASE [for writes]. Assuming I interpreted and clarified that sentence correctly, this single user's benchmark has me incredibly interested. Although write performance tanks wretchedly, read performance still soars. It gave me an idea. Idea: VirtualStore It so happens that thanks to sanity saving security features introduced in Windows Vista, write access to certain folders such as Program Files is virtualized for non-administrator processes. Which means, in normal (non-elevated) usage, a program or game's attempt to write data to its install location in Program Files (which is perhaps a poor location) is redirected to %UserProfile%\AppData\Local\VirtualStore, somewhere entirely different. Thus, to my understanding, writes to Program Files should primarily only occur when installing an application. This makes compressing it not only a huge source of space gain, but also a potential candidate for performance gain. Testing The beginning of this post has me a bit timid, it suggests benchmarking NTFS compression on a whole drive is difficult because turning it off "doesn't decompress the objects". However it seems to me the compact command is perfectly capable of doing so for both drives and individual folders. Could it be only marking them for decompression the next time the OS reads from them? I need to find the answer before I begin my own testing.

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  • ZFS - zpool ARC cache plus L2ARC benchmarking

    - by jemmille
    I have been doing lots of I/O testing on a ZFS system I will eventually use to serve virtual machines. I thought I would try adding SSD's for use as cache to see how much faster I can get the read speed. I also have 24GB of RAM in the machine that acts as ARC. vol0 is 6.4TB and the cache disks are 60GB SSD's. The zvol is as follows: pool: vol0 state: ONLINE scrub: none requested config: NAME STATE READ WRITE CKSUM vol0 ONLINE 0 0 0 c1t8d0 ONLINE 0 0 0 cache c3t5001517958D80533d0 ONLINE 0 0 0 c3t5001517959092566d0 ONLINE 0 0 0 The issue is I'm not seeing any difference with the SSD's installed. I've tried bonnie++ benchmarks and some simple dd commands to write a file then read the file. I have run benchmarks before and after adding the SSD's. I've ensured the file sizes are at least double my RAM so there is no way it can all get cached locally. Am I missing something here? When am I going to see benefits of having all that cache? Am I simply not under these circumstances? Are the benchmark programs not good for testing the effect of cache because of the the way (and what) it writes and reads?

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  • ATI radeon graphics card and screen freeze problem

    - by Thomas
    recently i upgrade my machine with new hardware component. my mother board is Gigabyte, processor Intel i3 3.6 ghz, ram 4 gb, graphics card ATI radeon 4350 1 GB. my OS installed is windows XP. when i am trying to play call of duty black ops then screen gets freeze and when i try to play other game like medal of honour then suddenly game closed suddenly after 15 or 20 minutes. i am not being able to find out the problem. whether i have problem in RAM or Graphics card. i asked few hardware person and one of them told me that i should installed windows 7 rather than windows xp. is it true. please help me to understand the problem and also tell me what should i do to fix this problem. please discuss in detail. thanks in advance. Update: yes i already install lates driver for ATI radeon 4350 but still the problem persist. do i need to install windows 7 instead of win xp because my processor is intel i3.

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  • Setting Ubuntu Global PATH for Ruby Enterprise Edition

    - by Wally Glutton
    Context: I recently installed Ruby Enterprise Edition (REE) on an Ubuntu 8.04 server. I would like for this new version of Ruby to globally supersede (for all users, crontabs, etc) the older version in /usr/local/bin. Attempted Solution #1: The REE documentation recommends placing the REE bin folder at the beginning of the global PATH in /etc/environment. I altered the PATH line in this file to read: PATH="/opt/ruby_ee/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games" This did affect my PATH at all. Attempted Solution #2: Next I followed these instructions and updated the PATH setting in the /etc/login.defs and /etc/crontab files. (I did not change /etc/sudoers.) This didn't affect my PATH either, even after logging out and rebooting the server. Other information: I seem to be having the same problem described here. I'm testing using the command: echo $PATH My shell is bash. My .bashrc doesn't not alter my PATH. I'm ssh'ed into the system for all testing. /opt/ruby_ee/ is a sym-link to /opt/ruby-enterprise-1.8.7-2011.03/

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  • Format CD-rom on Windows 7 that Windows 95 can read

    - by Joe Majsterski
    I pulled out my ancient Pentium 100Mhz running Windows 95 to play a game from 1996. This game has a critical bug in it that requires a patch. The problem is, the computer has no way to connect to the Internet or to the LAN. I tried burning a CD-rom on my Windows 7 PC to run on the Win95 PC, but it doesn't even recognize that there's a disc in the drive. I did some research, and apparently Windows 95 can't read UDF format. All the solutions recommend, of course, downloading a driver or fix or somesuch, which is my entire problem in the first place. I tried formatting the CD-rom on my Win7 PC, but all the format choices are versions of UDF. Is there a way to get Windows 7 to format in way that is compatible with Windows 95? EDIT: I think the problem may be that I only have CD-RWs. I think a regular CD-R might work, but I can't find any in the house. I'll see if I can scrounge one up and try that.

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  • Not Able To Connect to Windows Server 2008 R2 using FileZilla Externally

    - by obautista
    I configured FTP Service/Role on my Windows Server 2008 R2 machine. I am able to connect from the inside, but not from the outside. On the inside I tested using cmd prompt and IE FTP. On the outside, I am testing with FileZilla and IE FTP. From the outside, IE FTP prompts me to enter my username/pwd, but nothing happens. Page eventually times out and I get "Internet Explorer cannot display page". Using FileZilla, I get the following messages. Note FileZilla resolved domain name and authenticates. I did not configure FTP Wirewall Support on the FTP site. I am not sure if I need to do this. I set up basic authentication, non-ssl, not allowing anonymous. I testing with Windows Firewall Turned off and on (I added windows firewall rule for port 21). On my network firewall (Cisco), I added a rule to forward port 21 traffic to FTP Server. Status: Resolving address of ftp.technologyblends.com Status: Connecting to 75.149.66.201:21... Status: Connection established, waiting for welcome message... Response: 220 Microsoft FTP Service Command: USER * Response: 331 Password required for . Command: PASS *** Response: 230 User logged in. Command: SYST Response: 215 Windows_NT Command: FEAT Response: 211-Extended features supported: Response: LANG EN* Response: UTF8 Response: AUTH TLS;TLS-C;SSL;TLS-P; Response: PBSZ Response: PROT C;P; Response: CCC Response: HOST Response: SIZE Response: MDTM Response: REST STREAM Response: 211 END Command: OPTS UTF8 ON Response: 200 OPTS UTF8 command successful - UTF8 encoding now ON. Status: Connected Status: Retrieving directory listing... Command: PWD Response: 257 "/" is current directory. Command: TYPE I Response: 200 Type set to I. Command: PASV Error: Connection timed out Error: Failed to retrieve directory listing

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  • Xbox360 Universal Media Remote - out of sync?

    - by Traveling Tech Guy
    Hi, I have the Universal Media Remote from Microsoft, which was included with my HD-DVD package. I've been using it for over a year to watch videos/DVDs on my Xbox360 and it saved me the hassle of navigating with the game controller (which turns itself off every 5 minutes).All of a sudden (it didn't fall or suffer any severe trauma), it does not communicate with the Xbox anymore: it is on, I replaced batteries several times, but the Xbox does not respond to commands. The TV does - volume, channels, etc. - but I need the Xbox functionality.As far as I can see, there's no way to sync the remote with the Xbox - it lacks that small sync button that the game controllers have.I called Microsoft Support and spoke for an hour to someone who, I guess didn't know what to do at all. Bottom line - since it's been over a year, they won't fix/replace it - I have to get a new one.Before I do (if I do), I need to know if there's anything I can do with the existing remote, and will I have the same problem with a new one (i.e. the problem is with the Xbox itself)? Thanks!

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  • GTX 280 purple snow on bootup, card works without drivers

    - by Brokar
    i have owned a ASUS GTX280 for 3 years now. The card has been great all along but i started having problems 10 days ago. I was playing Diablo 3 for 1 week on max settings no problems, then suddenly my display kept getting some weird purple/colours as soon as i booted and logged into windows. Went into safe mode, updated drivers and it kept crashing. Formatted PC, fresh windows install with new WHQL drivers again same problem. Uninstalled nvidia drivers and pc has been running great for 4 days now, ofcourse i cannot run games but everything works on 1680x1050 resolution and i can browse internet,watch movies and use my PC for everything but gaming. As soon as i install nvidia drivers PC won't boot. I only wanna game a few hours a week (very busy program with school this month so it might be a blessing that i cannot game) and i would love it if i could keep the card. I am looking to upgrde later on when i will have time for gaming but i wonder if i could still use the card somehow with different/new drivers (tried older drivers that came with the card on a CD aswell) tldr: PC works fine with no nvidia drivers (apart from gaming ofc). Once i install WHQL drivers or older ones, cannot even log into windows. Fix?

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  • Windows Server 2008R2 Virtual Lab Activation strategies?

    - by William Hilsum
    I have a ESXi server that I use for testing, however, I am often needing to create additional Windows Server virtual machines. Typically, if I do not need a VM for more than 30 days, I simply do not activate. However, I have been doing a lot of HA/DRS testing recently and I have had a few servers up for more than this time. I have a MSDN account with Microsoft and have already received extra keys for Windows Server 2008 R2. I am doing nothing illegal and I am sure if I asked, they would issue more - but, I do not want to tempt fate! I have got 3 different "activated" windows snapshots I can get to at any time. If I try to clone these machines, I get the usual "did you copy or move them VM" message. If I choose copy, as far as I can see, it changes the BIOS ID and NIC MACs which is enough to disable activation. If I choose move, it keeps the activation fine (obviously, I know to change the NIC MAC - I believe I can leave the BIOS ID without problems). However, either of these options keeps the same SID code for the computer and user accounts. After the activation period has expired, as far as I can see, all that happens is optional updates do not work - it seems that the normal updates work fine. Based on this, as you can easily get in to Windows when not activated without any sort of workaround, I was wondering if it is ok just to leave a machine un activated? (However, I obviously would prefer if it was activated!) Alternatively, how dangerous is it run multiple machines on a non domain environment with the same SID? I am just interested to know if anyone can recommend a strategy for me? I have only found one solution that deals with bypassing activation - I am not interested in doing anything remotely dodgy... at a stretch, I am happy to rearm (I have never needed to keep a server past 100 days), but, I would rather have a proper strategy in place.

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  • Kunagi LDAP configuration problems

    - by Willem de Vries
    We recently started with Scrum at our company and we wanted to start using Kunagi to test and see how it works. So I installed the kunagi_0.23.2.deb packet that I downloaded from their website, on my Ubuntu 11.04 running in tomcat6 using openjdk-6-jre. everything works fine except I can't get the LDAP to work. I have one AD server and one LDAP at my disposal for testing. For the LDAP I use the following info: -uri: ldap://192.168.1.11:389 -user: some_tested_user -passwd: the_pass -DN: dc=colosa,dc=net -LDAP Filter: (&(objectClass=user)) I tested various LDAP Filters, I don't know if I have the right one. However I get an erro when clicking "test LDAP". The error refers to the DN: Server service call error Calling service TestLdap failed. java.lang.RuntimeException: InvalidNameException: [LDAP: error code 34 - invalid DN] With the AD server I get no error while testing, yet I am not able to login I get: "Login faild" every time. I don't know if this is because of the LDAP Filter I entered, yet I can't get it to work. I have read this http://kunagi.org/iss652.html stating that I need to create my accounts inside Kunagi before I can login. So I did this with no effect. So basically my question is, what causes this DN string error (I am sure mine is right), and what LDAP Filter should i use? Any help would be highly appreciated.

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  • Migrating to CF9: trouble getting JRun working with SSL

    - by DaveBurns
    I have a client on MX7 who wants to migrate to CF9. I have a dev environment for them on my WinXP machine where I've configured MX7 to run with JRun's built-in web server. I've had that working for a long time with both regular and SSL connections. I installed CF9 yesterday side-by-side with the existing MX7 install to start testing. The install was smooth and detected MX7, adjusted CF9's port numbers for no conflict, etc. Testing started well: MX7 over regular and SSL still worked and CF9 worked over regular HTTP. But I can't get CF9 to work with SSL. I installed a new certificate with keytool, FireFox (v3.6) complained about it being unsigned, I added it to the exception list, and now I get this: Secure Connection Failed An error occurred during a connection to localhost:9101. Peer reports it experienced an internal error. (Error code: ssl_error_internal_error_alert) I've been Googling that in all variations but can't find much help to get past this. I don't see any info in any log files either. FWIW, here's my SSL config from SERVER-INF/jrun.xml: <service class="jrun.servlet.http.SSLService" name="SSLService"> <attribute name="enabled">true</attribute>` <attribute name="interface">*</attribute> <attribute name="port">9101</attribute> <attribute name="keyStore">{jrun.rootdir}/lib/mykey</attribute> <attribute name="keyStorePassword">*deleted*</attribute> <attribute name="trustStore">{jrun.rootdir}/lib/trustStore</attribute> <attribute name="socketFactoryName">jrun.servlet.http.JRunSSLServerSocketFactory</attribute> <attribute name="deactivated">false</attribute> <attribute name="bindAddress">*</attribute> <attribute name="clientAuth">false</attribute> </service> Anyone here know of any issues re setting up SSL and CF9? Anyone had success with it? Dave

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  • Why are snapshots considered as temporary backups not real backups?

    - by Samselvaprabu
    I am using VMware ESXi. In our team we use to provide snapshots for long term backup. Then we faced issues like memory spillover and the server got hang up. I started reading in VMware knowledgebase articles and everywhere. Everywhere it was recommended not to have snapshots for a long time. Even VMware advised to keep snapshots for maximum of three days. But our team kept asking us to have at least two permanent snapshots (till deleting the VM). Sometimes we may use the VM for a year). one snapshot is for fresh machine state. (So when we complete testing an application, we will revert back to fresh state and install another application) (If I did not allow that, I may often need to host the VM.) Next snapshot for keeping the VM in some state (maybe they would have found an issue and keep that state for some time. Or they may install prerequisites for the application and keep the machine ready for testing.) Logically, their needs seems to be fair. But if I allow that, I am to permit them to hold the snapshots for long time. We are not using our VM as a mail server or database server. Why is keeping snapshots for long time having an adverse effect? Why are snapshots considered as temporary backups, not real backups?

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  • Rapidly changing public IP addresses on certain networks?

    - by zenblender
    I run/develop an online game where many of our users are in southeast asia. I recently went to southeast asia and made an alarming discovery. Anywhere I got internet access, whether it was via 3G, a LAN in a hotel, or wifi in a cafe, both in Singapore and the Philippines, I noticed that my IP address was changing CONSTANTLY. I mean the public IP address, not the private one. I could load a page like whatismyip.com and just hit reload and see a new IP address show up every 5-10 seconds! This has lots of consequences for my online game, as many things "break" if the IP address changes for a given user. Basically, I would like to know more about this. Is there a name for the kind of network or router or paradigm that causes this, so I can read up on it? I don't understand WHY a network would function this way. Does it do this on purpose? Is it for security reasons? Is it to anonymize and protect the identity of the users? Or is it just an "old" method that is mostly obsolete in the rest of the world? Thanks for any info that will help me to understand.

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  • Ventrilo sound delay issue in Windows 7

    - by TM
    I've upgraded my machine to Windows 7 Professional (x64) (using format + clean install, not upgrade install). Everything seems to work fine except for Ventrilo. I used to have Vista Business x64 and Ventrilo worked fine there, on the same machine. The issue I am having is that when I am playing a game and using Ventrilo, everything works fine at first, but after a few minutes, I stop hearing anything that people say. If I minimize, I can see the speaker icons lighting up (meaning that people are talking), but I still can't hear anything. The sounds from the game and other OS sounds still play through the speakers just fine. Eventually, I will close ventrilo and then after a few seconds I will start hearing things that people were saying several minutes ago. I start hearing everything that was said, with no "silent time" in between. Note that the sounds keep playing even AFTER the ventrilo process is dead. I've tried using Ventrilo x64 and x86 versions. Does anyone have any advice on how to fix this problem?

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  • Disabled FRS replication on a DFS link, but the targets still list the replica set in their FRS conf

    - by Graeme Donaldson
    It's been a while since I've had to deal with the wonders of FRS, so I'm doing some testing to refresh my memory. This is what I've done so far. I am stuck with FRS rather than DFS-R for the moment since not all of my link targets are running R2. Created a domain-based DFS root, hosted on 4 servers. Created a DFS link under the root, targeted at 2 servers. The shares on both servers were empty. Dropped about 500MB of data into the target folder on one server and waited for replication to complete. Added/removed/modified files on both targets and confirmed that changes are replicated within a few seconds. Deleted the contents of the target folder on 1 server and waited for the other server to replicate the deletion. All of this worked perfectly, so now I want to remove my DFS link since I only created it for testing purposes. This is where it gets weird. I'm pretty sure that in the past I've disabled replication on the DFS link and after a short amount of time each target would log an info event in the FRS event log, something along the lines of "this server is no longer a member of replica set X". I have waited about 3 hours and I haven't seen this happen. ntfrsutl ds tells me that the server is not a member of any set, which is expected because when I disable replication on the link, the AD attributes on the computer object are removed. The weird part is... ntfrsutl sets still shows me the replica set, with all the properties, etc. So it seems like the FRS-related attributes of the target server's AD object are gone, but the FRS service for some reason hasn't removed the replica set. Can anyone see what I have done wrong?

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  • How to "swap in" again memory from page file to physical memory in Windows at once (like linux swap-off)

    - by Arnout
    Is there a way to swap back in (to put back all the memory data that was put into the page file (or swap, whatever you prefer)) memory on a windows PC? On linux, one can easily do this with the swapoff /dev/sdaX, where X is the swap partition. On windows, it seems to ask me to reboot each time.. The reason I'd like to do this, is that, even though swapping out the data to the swap file allows me to play a resource-hungry game fully in physical ram, when I stop the game, all the rest of my programs run slow. This is or course normal; all the programs were pushed into the page file because my RAM was too small, and all memory access to those programs after gaming bumps into hard page faults, with major delays and some frustration as a consequence. However, that frustration could easily be avoided, by simply allowing the PC to copy all data back into the physical memory for a minute or so, and then resume working on a fast working PC! (rather than having to endure the slowness -while- working) Thanks in advance for any advice on this! Kind regards

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  • vagrant and puppet security for ssl certificates

    - by Sirex
    I'm pretty new to vagrant, would someone who knows more about it (and puppet) be able to explain how vagrant deals with the ssl certs needed when making vagrant testing machines that are processing the same node definition as the real production machines ? I run puppet in master / client mode, and I wish to spin up a vagrant version of my puppet production nodes, primarily to test new puppet code against. If my production machine is, say, sql.domain.com I spin up a vagrant machine of, say, sql.vagrant.domain.com. In the vagrant file I then use the puppet_server provisioner, and give a puppet.puppet_node entry of “sql.domain.com” to it gets the same puppet node definition. On the puppet server I use a regex of something like /*.sql.domain.com/ on that node entry so that both the vagrant machine and the real one get that node entry on the puppet server. Finally, I enable auto-signing for *.vagrant.domain.com in puppet's autosign.conf, so the vagrant machine gets signed. So far, so good... However: If one machine on my network gets rooted, say, unimportant.domain.com, what's to stop the attacker changing the hostname on that machine to sql.vagrant.domain.com, deleting the old puppet ssl cert off of it and then re-run puppet with a given node name of sql.domain.com ? The new ssl cert would be autosigned by puppet, match the node name regex, and then this hacked node would get all the juicy information intended for the sql machine ?! One solution I can think of is to avoid autosigning, and put the known puppet ssl cert for the real production machine into the vagrant shared directory, and then have a vagrant ssh job move it into place. The downside of this is I end up with all my ssl certs for each production machine sitting in one git repo (my vagrant repo) and thereby on each developer's machine – which may or may not be an issue, but it dosen't sound like the right way of doing this. tl;dr: How do other people deal with vagrant & puppet ssl certificates for development or testing clones of production machines ?

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  • Internal and External DNS from Different Servers, Same Zone

    - by Shane
    Hello All, I am either having trouble understanding how DNS works, or I am having trouble configuring my DNS correctly (either one isn't good). I am currently working with a domain, I'll call it webdomain.com, and I need to allow all of our internal users to get out to dotster to get our public DNS entries just like the rest of the world. Then, on top of that, I want to be able to supply just a few override DNS entries for testing servers and equipment that is not available publically. As an example: public.webdomain.com - should get this from dotster outside.webdomain.com - should get this from dotster as well testing.webdomain.com - should get this from my internal dns controller The problem that I seem to be running into at every turn is that if I have an internal DNS controller that contains a zone for webdomain.com then I can get my specified internal entries but never get anything from the public DNS server. This holds true regardless of the type of DNS server I use also--I have tried both a Linux Bind9 and a Windows 2008 Domain Controller. I guess my big question is: am I being unreasonable to think that a system should be able to check my specified internal DNS and in the case where a requested entry doesn't exist it should fail over to the specified public dns server -OR- is this just not the way DNS works and I am lost in the sauce? It seems like it should be as simple as telling my internal DNS server to forward any requests that it can't fulfill to dotster, but that doesn't seem to work. Could this be a firewall issue? Thanks in advance

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  • Bash script to run a clamscan on Ubuntu- how to use return values properly?

    - by Marius
    I'm trying to put together a simple script that will scan my home directory with clamscan and give me a warning if any viruses were found. What I have so far is: #! /usr/bin/env bash clamscan -l ~/.ClamScan/$(date +"%a%b%d") -ir /home RETVAL=$? [ $RETVAL -eq 0 ] && notify-send 'clamscan finished. No viruses found' [ $RETVAL -eq 1 ] && notify-send 'clamscan found a virus' && touch ~/Desktop/VirusFound [ $RETVAL -eq 2 ] && notify-send 'clamscan encountered errors. Check the logs' && touch ~/Desktop/ClamscanError find ~/.ClamScan/* -mtime +7 -exec rm {} \; However, I'm unsure about a couple of things: I'm always wary of using rm- as far as I can tell, the find command I've got should be deleting any log files that are more than a week old. I'm also not entirely sure how the return value testing works- I've got a manual that briefly covers bash, which says that the meaning of $? is "match one character", and I'm not entirely sure how that grabs the return value. Should I be using -eq or = for testing the return value? From what I can tell -eq tests strings and = tests numerals, but I'm not sure what the type of the return value is.

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  • How do I know what hardware to buy to meet my needs?

    - by Darth Android
    While Stack Exchange does not permit shopping recommendations, it doesn't provide any general advice to consider when buying hardware. So, instead of just telling those that ask what to buy that it's not allowed, let's tell them how to figure out what they need. When looking forward to build a computer, how do I know what to buy? How do I find out if a given CPU will be enough for a certain game or application that I want to run? How do I find out if a given graphics card will be enough for a certain game or application? What is important when looking at motherboards? How much memory do I need? How do I know how much wattage I need for a power supply? What size case do I need? What relevant standards do I need to read up on and be aware of? PCI, PCIe, SATA, USB 2.0, USB 3.0, etc... What "gotchas" do I need to be on the lookout for? Please keep responses generation-agnostic to ensure they will be helpful to our future users. :)

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  • High latency issue for web service call from amazon aws ec2 to local server

    - by SibzTer
    We have a legacy web application that is running in our data center on premises located in Houston. We have a developed a new .net 4 based web application in order to provide new features to customers. The new web application is hosted in amazon aws ec2 environment (N. Virginia region us-east-1b zone). In order to get seamlessly integrate with the legacy application the new web application makes web service calls to retrieve data. We are seeing an unusually high latency time in the order of 5+ seconds for these web service calls. The exact same web service call returns in less than a second on our local PCs (which makes sense given physical proximity to the actual server). The weird part is that we have developers in California who also have the same milliseconds response time. We are testing the web service response using third party tools such as SoapUI, Google Chrome extensions such as Advanced REST Client, Postman REST Client, etc. As if this wasnt weird enough, we have noticed the same low latency from certain other ec2 instances while testing which are in the same region and availability zone as well. If we experienced the high latency consistently from all the ec2 instances I could understand. But there is something else going on. Comparing the various stats and results between the low latency and high latency ec2 servers do not show any significant differences: ping (constant 40ms), tracert, winmtr, etc. We have instances that are in the VPC as well. So I tried both the public and private IP address of the web service host server and that didnt make a difference either for the above results. We need to resolve this latency issue as this is causing the resulting web pages to load very slowly (almost 15+ seconds which is simply unacceptable). The ec2 instances have Windows Server Datacenter 64 bit. Let me know if there is any other infor I can provide to help diagnose this.

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  • Word 2013 can't compare readonly files

    - by Moshe Katz
    I am using Tortoise SVN to work with a repository that contains some documentation saved as Word documents. On my old computer, with Office 2010, I was able to compare with previous revisions. Tortoise would open Word in compare view so I could see the differences between the files. I have installed Office 2013 (final version from Technet, not the preview version) on my new laptop for testing and now I can no longer compare Word Documents. Tortoise pops up a generic error that it was unable to compare the two files. Tortoise uses a JScript file to interface with Word, so I ran that file through a debugger and found that the actual error is: The Compare method or property is not available because this command is not available for reading. Some Googling followed by some testing revealed that the error is caused by the first file opened (in this case, the previous version) being opened as Read-Only. If I change the JScript code to open in normal mode, and I find the file on the system and un-check the "Read Only" property (if necessary), then the comparison opens as expected. I was unable to find any documentation about this change to Word on any Microsoft site. Does anyone know why this has been changed, and if it is intentional and not a bug, what the benefit is of requiring the file to be writable in order to compare it with another? Note: This is tagged word-2013-preview but it is actually for the release version of Word that is available on MSDN and Technet. I do not have enough rep. on this site to create new tags (yet).

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  • Webservice randomly dropping connections - possibly due to firewall nonevent data?

    - by adam
    I have a hosted webapp which requests data from a REST webservice in our office. Each page calls one (or several) webservices, which go from our host, via our firewall (a Watchguard Firebox) to a server in our office. All of a sudden, the app has dramatically slowed. We have determined that the webservice is timing out at random when called externally (it's fine when called within the office network). I'm pretty certain it's our connection which is dropping the webservice call, so I've written a quick php/curl script which calls the webservice over many iterations and shows the various timings. Below is an example output, showing both a failed and a successful call (with a 5 second timeout): http_code namelookup_time connect_time pretransfer_time starttransfer_time total_time 1 0 0.000096 0.0342 0.0000 0.0000 0.0342 2 200 0.000052 0.0332 0.1327 0.1751 0.1752 As per iteration #1 above, failed requests seem to be failing between connect and pretransfer. I'm not sure if this shows that the connection is successfully past the firewall, or could the firewall still cause an issue? Our firewall is showing a series of nondata event log messages for the relevant access rule. Our IT team tells me these are routine, although I can find no mention of these in Google. I'm not sure if this fits in between connect and pretransfer. Having elinated the webservice server (by testing internally) and the live webapp (by testing different code on different external servers, I am left suspecting the connection to the office. Could the firebox nondata events be causing a problem between connect and pretransfer?

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  • Getting 502 instead of 503 when all backend servers are down running HAProxy behind Apache

    - by scarba05
    I'm testing running HAProxy as a dedicated load balancer behind Apache 2.2, replacing our current configuration where we use Apache's load balancer. In our current, Apache only, set-up if all the backend (origin) servers are down Apache will serve a 503 service unavailable message. With HAProxy I get a 502 bad gateway response. I'm using a simple reverse proxy rewrite rule in Apache RewriteRule ^/(.*) http://127.0.0.1:8000/$1 [last,proxy] In HAProxy I have the following (running in default tcp mode) defaults log global option tcp-smart-accept timeout connect 7s timeout client 60s timeout queue 120s timeout server 60s listen my_server 127.0.0.1:8000 balance leastconn server backend1 127.0.0.1:8001 check observe layer4 maxconn 2 server backend1 127.0.0.1:8001 check observe layer4 maxconn 2 Testing connecting directly to the load balancer when the backend servers are down: [root@dev ~]# wget http://127.0.0.1:8000/ test.html --2012-05-28 11:45:28-- http://127.0.0.1:8000/ Connecting to 127.0.0.1:8000... connected. HTTP request sent, awaiting response... No data received. So presumably this is down to the fact that HAProxy accepts the connection and then closes it.

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