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• Load testing nginx inside AWS

  - by andy

  I'm trying to load test nginx running on AWS. I need to try to optimise it to handle 1Gbps of inbound traffic. Currently I've got it to peak at 85Mbit/s by running nginx on an m1.large with 4 other machines hitting it by using ab with -i (for head requests) -k (keepalives) -r (ignore failed requests) -n 500000 -c 20000. I'm struggling to generate more than 85 Mbit/s traffic from 4 machines, yet when I do scp a large file I get nearly 0.25Gbit/s of traffic going over the network. Are there any tools or approaches that I could use to load test nginx that might generate more load? I'm only interested in inbound traffic, so perhaps a DoS tool could help if it chucks away responses? I'm hitting a very small (40 byte) static asset, and have peaked at handling 50K concurrent connections and getting 25k reqs/s when just using a single load generator machine.

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• How to whitelist a domain while blocking forgeries using that domain?

  - by QuantumMechanic

  How do you deal with the case of: wanting to whitelist a domain so that emails from it won't get eaten, but not having emails forged to appear to be from that domain get bogusly whitelisted whitelist_from_recvd looks promising, but then you have to know at least the TLD of every host that could send you mail from that domain. Often RandomBigCompany.com will outsource email to one or more sending companies (like Constant Contact and the like) in addition to using servers that reverse-resolve to something in its own domain. But it looks like whitelist_from_recvd can only map to one sending server pattern so that would be problematic. Is there a way to say something like "if email is from domain X, subtract N points from the spam score"? The idea would be that if the mail is legit, that -N will all but guarantee it isn't considered spam. But if it is spam, hopefully all the other failed tests will render it spam even with the -N being included.

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• Daemon Tools error (0xc0000006)

  - by Roberts

  I tried to reinstall Windows XP to Windows 7, but I could not install the video card drivers because the driver installation software only works on XP.I have launched the setup program with XP mode. After I installed the setup, I restarted the computer and Windows 7 wasn't booting.But that isn't the problem why I asked this question. The problem is that I have reinstalled my Windows 7 Ultimate to Windows XP SP3 and I wanted to install Dameon Tools.After installation I restarted the PC (as the setup wanted) and when the Daemon Tools launches it shows the error: Application failed to initialize properly (0xc0000006). Click OK to terminate the application.

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• Rsync fails for files that start with underscore when destination is zfs

  - by Eric

  everyone. I'm using rsync3.1.0pre1 on Mac OS X 10.8.5, and am trying to rsync one folder to another. The destination is a ZFS volume mounted via SMB. The problem I'm having is that files that start with underscore (e.g., '_filename.jpg') are not being successfully synced to the destination. I get the following error message: rsync: mkstemp "/path/to/destination/._filename.jpg.NUgYJw" failed: Permission denied (13) In this case, '_filename.jpg' does not make it to the destination. I understand that rsync creates hidden, temporary files at the destination which are preceded with '.' and have a random file extension appended on the end. But the original filename starts with '', not '.', and I haven't asked rsync to copy extended attributes / resource forks over (unless it always does it). The rsync command I'm using is: rsync -avE --exclude='.DS_Store' --exclude '.Trash' --exclude 'Thumbs.db' --exclude '._*' --delete /source/ /destination/ Has anyone found a way around this problem? Thank you!

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• group write permission ignored in ubuntu

  - by NorthPole

  Its probably my stupidy here but i'm stuck on this and would appreciate the help. I want my user to have full access to the local apache root folder, and i also want the apache to have full access to the same folder. What i did was create a new group called DevGroup and i added my username and www-data there. also i changed the permissions to 770 to allow full group access but now it wont allow me or the apache any kind of access to the folder. here is what i get with ls drwxrwx--- 12 root DevGroup 4096 Sep 27 17:34 testFolder which seems perfect but when i try as a user to access the file i get this var/www$ ls testFolder/ ls: cannot open directory testFolder/: Permission denied also when i try to access the a page in the folder from browser [Thu Sep 27 17:47:16 2012] [error] [client 127.0.0.1] PHP Fatal error: Unknown: Failed opening required '/var/www/testFolder/foo.php' (include_path='.:/usr/share/php:/usr/share/pear') in Unknown on line 0

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• XAMPP won't start Apache on Mac OS

  - by Paul Masri

  When I try starting Apache from the XAMPP control panel (Mac OSX Snow Leopard), I get the following error popup and Apache won't start: /Applications/XAMPP/xamppfiles/bin/apachectl: line 70: ulimit: open files: cannot modify limit: Invalid argument (48)Address already in use: make_sock: could not bind to address [::]:80 XAMPP was running perfectly 10 minutes earlier. I stopped Apache to add some .conf files and it failed on restart. I removed all the new .conf files (i.e. reverted it to how it was before) but now I get the above message. EDIT: I've checked AppMonitor and I see the "httpd" processes (one by _www nested within root). Just tried quitting these but they're auto-restarted on new process IDs and it didn't solve the problem.

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• How can Automator or Applescript rotate 500,000 images in folders and subfolders?

  - by Ludi

  I have very specific question. I've got 500,000 images that sit in 98 subfolders. Some of the subfolders contain 25,000 images. Is there any script/automator workflow that I can use? I was trying to create a workflow: Ask for Finder Items Get Folder Contents (tick repeat for each subfolder found) Rotate images It works OK, but only for these folders where there is less than 4,096 files: I normally receive following error message: Rotate images failed - 1 error too many arguments (12019) -- limit is 4096 Is there any way to increase this limit or create completely different apple script? I really hope that someone will help me with this one.

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

  - by marc_s

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

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• SQL Server Express 2005 and Vista x64 Home Preminum - How do I do a clean install?

  - by gemeye

  The install for SQLSRVREXP 2005, for Vista x 64 its SQLEXPR_ADV.EXE downloaded from http://www.microsoft.com/downloads/en/confirmation.aspx?familyId=b448b0d0-ee79-48f6-b50a-7c4f028c2e3d&displayLang=en The first part of the installation is an analysis of the computer's configuration. There was one warning. Opening the details shows: ASP.Net Version Registration Requirement (Warning) Messages ASP.Net Version Registration Requirement Failed to find the ASP.Net Version Registration with Microsoft Internet Information Services (IIS) Anyone have any idea how to clear this up? What is the ASP.Net Version Registration wiht Microsoft IIS mean? And how would I fix this? Thank you in advance.

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• Ubuntu Studio 10.4 boots to terminal mode only

  - by Don

  I did clean install from ISO DVD. It boots only to command line asking for login. After I login I enter STARTX and desktop appears and some of the studd actually works, but there are a lot of problems: there is no way to reboot or shut down except to stopx/logoff and enter shutdown sound system doesn't respond pulse audio volume control gives "connection failed, connection refused" DVD drives not available GDebi Package installer is grayed out and so I can't use it (but synaptic package manager works OK) Software Center won't start when clicked -- it just stops trying DBus cant run because it says /usr/local/var/run/dbus/system_bus_socket file not found (also /var/run/dbus/system_bus_socket file not found) There's just a lot of things wrong and I can't help but think something is missing or was mis-coded in the distro so that there are typos in some script somewhere. If anyone can tell me where to begin to untangle this mess I'd appreciate it, but I think it all begins when it can't start the GUI automatically and I need to enter STARTX.

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• Enabled boot logging option in Win XP doesn't produce ntbtlog.txt file

  - by Xolstice

  I have tried enabling the boot logging option for Windows XP Pro using the F8 and also boot.ini method, but it does not seem to be creating the expected ntbtlog.txt file. I'm doing this to help me solve a problem where the Avast antivirus service is not starting up - it keeps complaining with the message: "Error 1068: The dependency service or group failed to start". I seem to notice that the file is produced on a system where the Avast antivirus is starting up without any problems. Can anybody suggest why the ntbtlog.txt file is not being created?

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• How can I disable my laptop's built-in keyboard?

  - by sam

  I have a HP Compaq Presario C700 laptop with Windows 7 installed on it. My laptop's keyboard is not working properly; some keys never work and some keys will keep on pressing. I've formatted the OS but it didn't solve my problem. I bought an external USB keyboard and it works well. As some keys in the built-in keyboard activate themselves, I still couldn't work effectively. After searching Google I tried the following steps to disable the built-in keyboard: Disabled keyboard drivers: This didn't work because when the system reboots, the driver gets installed again automatically. Installed irrelevant driver for keyboard: This failed - I couldn't install the driver. After rebooting it installed the correct driver automatically. Can anyone help explain how I can temporarily uninstall my built-in keyboard? I don't want to remove it manually (removing the hardware cable).

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• Outlook stopped working after updating to Windows 8

  - by MikkoP

  I downloaded Windows 8 update from Microsoft's site and installed it. Everything works perfectly except Outlook. Sometimes receiving messages doesn't work for whatever reason. Now the problem is sending and replying. Before these two worked but after receiving messages started to work, these problems have occurred. When I try to press New to create a new email, I get the following error message Cannot create the e-mail message because a data file to send and receive messages cannot be found. To add a data file, such as a personal folder file, double click the Mail icon in Windows Control. When I try to reply a message, I get the following one The operation failed. An object could not be found. After the update Outlook worked ok. I've had other problems with Outlook too.

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• Everytime I ping my server, it is pinging localhost instead?

  - by esac

  I recently setup a new server for use with SQL. When I tried to connect via SSMS remotely, it failed. When I pinged it, it is pinging localhost, what is going on here? Please let me know if more details will help. It is Windows Server 2008. C:\>ping 0x7F000001 Pinging 127.0.0.1 with 32 bytes of data: Reply from 127.0.0.1: bytes=32 time<1ms TTL=128 Reply from 127.0.0.1: bytes=32 time<1ms TTL=128 Reply from 127.0.0.1: bytes=32 time<1ms TTL=128 Reply from 127.0.0.1: bytes=32 time<1ms TTL=128 Ping statistics for 127.0.0.1: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 0ms, Maximum = 0ms, Average = 0ms

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• Install multiport module on iptables

  - by tarteauxfraises

  I'am trying to install "fail2ban" on Cubidebian, a Debian port for Cubieboard (A raspberry like board). The following rule failed due to "-m multiport --dports ssh" options (It works, when i run manually the command without multiple options). $ iptables -I INPUT -p tcp -m multiport --dports ssh -j fail2ban-ssh" iptables: No chain/target/match by that name. When i make a cat on "/proc/net/ip_tables_matches", i see that multiport module is not loaded: $ cat /proc/net/ip_tables_matches u32 time string statistic state owner pkttype mac limit helper connmark mark ah icmp socket socket quota2 policy length iprange ttl hashlimit ecn udplite udp tcp What can i do to compile or to enable the multiport module? Thanks in advance for your help

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• How can I get rsync to ignore missing files?

  - by Joe Casadonte

  I'm executing a command like the following to several different systems: $ rsync -a -v [email protected]:'/path/to/first/*.log path/to/second.txt' /dest/folder/0007/. Sometimes *.log does not exist, and that's OK, but rsync generates the following error: receiving file list ... rsync: link_stat "/path/to/first/*.log" failed: No such file or directory (2) done Is there any way to suppress that? The only way I can think of is to use include and exclude filters, which just seem a PITA to me. Thanks!

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• Windows 7 security and Avast antivirus turned off by themself

  - by Simon Verbeke

  I was just browsing around when at once I got messages that UAC, windows defender, Avast, etc. got turned off, without me doing anything. Then my PC turned by itself. I'm now running virus scans and I checked my eventlogs, but found nothing yet. Windows Update also failed to install a new definition after I rebooted. Any idea what this could've been? EDIT: Forgot to mention that everything was turned on again after rebooting. I have since the reboot got nothing abnormal.

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• Port Forwarding IPTABLES public IP

  - by tric

  hello i have a computer linuxbox_1.eth0 public ip 89.40.x.y eth1 public ip 85.121.a.b i have another linuxbox_2. ethx public ip 86.34.c.d what i want to do is forward port 8001 from linuxbox_1 eth0 89.40.x.y:8001 to linuxbox_1 eth1 85.121.a.b, and then forward again port 8001 from linuxbox_1 eth1 85.121.a.b:8001 to linuxbox_2 ethx 86.34.c.d:80 i have searched for answers using google "that knows everything" but this time it has failed. i would like to use IPTABLES or any other tool like rinetd. i tryed rinetd but it somehow mistakes the eths sorry for my bad english. 10q

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• How do I install the latest Sun Java JRE on Ubuntu Server 9.10?

  - by blackrobot

  Unfortunately, if I try to install sun-java via apt-get, it's not found in the repositories. # apt-get install sun-java6-jre Reading package lists... Done Building dependency tree Reading state information... Done Package sun-java6-jre is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source E: Package sun-java6-jre has no installation candidate If I try to install it using the bin from Sun's website, here's the issue: # ./jre-6u18-linux-i586.bin (license agreement...) Do you agree to the above license terms? [yes or no] yes Unpacking... Checksumming... Extracting... ./jre-6u18-linux-i586.bin: 366: ./install.sfx.10648: not found Failed to extract the files. Please refer to the Troubleshooting section of the Installation Instructions on the download page for more information. Thanks for the help.

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• Eliminate single point of failure for webservers?

  - by George Bailey

  I know in DNS, that each of the DNS servers will be tried to see if they will respond I know in email that in the event of a failure it will go to the next one in the list or it will hold the mail for a period of time As far as I know,, in webservers,, the browser will get one of the webserver IP addresses and try it and if it fails it will give up. Is this correct? If so,, then the only way to direct traffic away from a failed IP address would be with the DNS servers.. and even that would not update immediately?

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• Server browser resolves localhost, but not server name

  - by user147795

  I have a 2008 R2 server that I recently installed Solarwinds on. It is running IIS V7.5. I got the Solarwinds site loaded into IIS, however I can't resolve it when using the server name. It will however resolve when I put http:// localhost into the browser. I have tried editing the Hosts file to no avail. I have also played around with our DNS server to see if I can figure anything out there. I mess with the bindings in IIS, when I remove the binding for "localhosts" it stops resolving. But still get DNS lookup failed if I add the actual server name to the binding. Any ideas?

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• SSL issues with puppet agent at openSUSE

  - by Roman Grazhdan

  I have a master running at my vps, and it has a simple helloworld manifest which works fine with any ubuntu machine I have. It connects, exchanges keys and creates test file allright, so I'm sure it's not server issue. The agent which is running at a virtual machine with openSUSE says: err: Could not request certificate: SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed. This is often because the time is out of sync on the server or client I believe it's probably a broken or missing lib, since the package is not built very accurately - it wouldn't start out of the box because of wrong path to lockfile, for example. So how do I figure out what exactly is wrong here? The time is allright, I've checked it. I probably could do without SSL if it's possible, since that SUSE machines are just for training, but it's the last opportunity.

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• XAMPP on windows 7 not working

  - by 404Error

  Hey there, I just installed XAMPP lite on Windows 7. I have two drives - C: for the OS and regular files, and an external drive E:. I insatlled XAMPP lite on E: (on the root), and its been giving me problems. Apache works well enough, but MySQL doesn't work. When I go to http://localhost/phpmyadmin/, it gives me the following error: Error MySQL said: #2003 - Can't connect to MySQL server on 'localhost' (10061) Connection for controluser as defined in your configuration failed. Any ideas as to what could be the problem? I used the zip file for XAMPP lite, the 32 bit version. This is on Windows 7 Home premium. Thanks!

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• tailwatchd - chkservd on host.domain.com status: hang

  - by Zim3r

  The chkservd sub-process with pid 17420 was running for 602 seconds. The sub-process was terminated as it exceeded the time between checks of 300 seconds. Please check /var/log/chkservd.log and /usr/local/cpanel/logs/tailwatchd_log to discover the I was notified for this error by email on the destination server while transferring server. what does it mean ? and also this happened: ftpd failed @ Wed Aug 8 11:26:38 2012. A restart was attempted automagically. Service Check Method: [socket connect] Reason: Timeout while trying to get data from service: Died at /usr/local/cpanel/Cpanel/TailWatch/ChkServd.pm line 607. Number of Restart Attempts: 1 Startup Log: Starting pure-config.pl: Running: /usr/sbin/pure-ftpd -O clf:/var/log/xferlog --daemonize -A -c50 -B -C8 -D -fftp -H -I15 -lextauth:/var/run/ftpd.sock -L10000:8 -m4 -s -U133:022 -u100 -Oxferlog:/usr/local/apache/domlogs/ftpxferlog -k99 -Z -Y1 -JHIGH:MEDIUM:+TLSv1:!SSLv2:+SSLv3 [ OK ] Starting pure-authd:

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• VMware Workstation 7&8&9 does not generate /etc/vmware/network upon installation

  - by dash17291

  When I install VMware Workstation on Arch linux Virtual ethernet is not working. $ sudo tail /var/log/vnetlib Aug 28 22:20:33 VNLFileExists - Cannot check for file or directory: /etc/vmware/networking , error: No such file or directory Aug 28 22:20:33 VNLNetCfgLoad - Import file does not exist Aug 28 22:20:33 VNL_Load - Error loading the vnet configuration, file used: /etc/vmware/networking Aug 28 22:20:33 VNLNetCfgUnload - Requested cache is not loaded Database file is not present. Failed to initialize Aug 28 22:20:41 VNLFileExists - Cannot check for file or directory: /etc/vmware/networking , error: No such file or directory Aug 28 22:20:41 VNLNetCfgLoad - Import file does not exist Aug 28 22:20:41 VNL_Load - Error loading the vnet configuration, file used: /etc/vmware/networking Aug 28 22:20:41 VNLNetCfgUnload - Requested cache is not loaded Required modules compiled. Previously I have copied that file or directory (I don't remember) from a working installation, but now I need a real solution. It's strange for me, may be a hardware issue also because with Ubuntu the same thing happens on the same computer.

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