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• How do MaxSpareServers work in Apache?

  - by John Hunt

  I've scoured the web but I can't find out what MaxSpareServers are in Apache MPM prefork.. The MaxSpareServers directive sets the desired maximum number of idle child server processes. An idle process is one which is not handling a request. If there are more than MaxSpareServers idle, then the parent process will kill off the excess processes. Great, but what causes a spareserver to be created? More importantly, when does a spare server go away? I understand that minspareservers are created gradually after the server is started.. How do maxspareservers relate to maxclients? Basically I'm at a bit of a loss on how best to configure Apache.. there's a lot of documentation out there but it isn't that clear. Thanks, John.

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• How does the data storage work? [closed]

  - by Andres Adhi

  I am really new to the whole concept of Data storage, Domain, Server and everything else related to this. Can someone pleases explain what a Domain is? How are server part of the Domain and How are Database stored in the Server or Domain? How does a new server be able to connect to existing database server to get all the data needed. I tried to find this information in the web but I am not really finding a good resource. It may be because these is really basic information. I will really appreciate if someone can explain these concept in plain terms. Thanks in advance.

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• Added autossh in rc.local, but the dynamic port forwarding won't work

  - by rankjie

  I am using Rasbian on my newly arrived Rasp.Pi, and decided to make it my own proxy server. Now I need to set up a ssh tunnel on the Pi to my Linode server, and make it auto start with the system. What did I do: Add this line to /etc/rc.local autossh -f theRemoteServer -N -D 5555 -L 1234:localhost:22 After I reboot, I found out that I can't use the localhost:5555 as a socks proxy. So I type the command ps -A | grep ssh then I can see the autossh and ssh all running: pi@raspberrypi ~ $ ps -A | grep ssh 2018 ? 00:00:00 sshd 2116 ? 00:00:00 autossh 2119 ? 00:00:00 sshd 2195 ? 00:00:00 sshd 3173 ? 00:00:00 ssh (I've installed autossh, and the command works if I type it manually.) (I use the passwordless key auth, so I don't have to enter password.) Much appreciated and sorry for my poor English.

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• Can't get PDO MySQL driver to work on PHP

  - by bart

  Trying to install Vanilla 2 locally using MAMP i got the error: "You must have the MySQL driver for PDO enabled in order for Vanilla to connect to your database". When I check phpinfo() I see: --with-pdo-mysql=shared,/Applications/MAMP/Library --with-pdo-pgsql=shared,/Applications/MAMP/Library/pg When I go and check out those paths I find the files: libpq.5.dylib libpq.dylib libpq.5.2.dylib When I check my php.ini file I see: ; Extensions extension=pdo_mysql.so In php.ini the path to the extension dir is correct (checked it manually): extension_dir = "/Applications/MAMP/bin/php5.3/lib/php/extensions/no-debug-non-zts-20090626/" In this folder I find the file: pdo_mysql.so phpinfo() gives me two sections: PDO PDO drivers: sqlite, sqlite2 and pdo_sqlite SQLite Library: 3.6.22 So everything seems to be fine, but can't get the PDO MySQL driver working :(

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• How does VirtualBox's memory usage work?

  - by DrFredEdison

  I've been running several VM's with VirtualBox, and the memory usage reported from various perspectives, and I'm having trouble figuring how much memory my VMs actually use. Here is an example: I have a VM running Windows 7 (as the Guest OS) on my windows XP Host machine. The Host Machine Has 3 GB of RAM The Guest VM is setup to have a base memory of 1 GB If I run Task Manger on the Guest OS, I see memory usage of 430 MB If I run Task Manger on the host OS, I see 3 processes that seem to belong to VirtualBox: VirtualBox.exe (1), using 60 MB of memory (This one seems to have the most CPU usage) VirtualBox.exe (2), using 20 MB of memory VBoxSvc.exe, using 11.5 MB of memory While running the VM, the Host OS's memory usage is about 2 GB When I shut down the VM, the Host OS's it goes back to memory usage goes down to about 900 MB So clearly, there are some huge differences here. I really don't understand how the GuestOS can use 400+ MB, while the Host OS only shows about 75 MB allocated to the VM. Are there other processes used by VirtualBox that aren't as obviously named? Also, I'd like to know if I run a machine with 1 GB, is that going to take 1 GB away from my host OS, or only the amount of memory the Guest machine is currently using? update Somene expressed distrust over my memory usage numbers, and I'm not sure if that distrust was directed at me, or my Host OS's Task Manager's reporting (which is perhaps the culprit), but for any skeptics, here is a screenshot of those processes on the host machine:

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• Writing scripts that work with my emails

  - by queueoverflow

  I currently use Thunderbird as my email client and it has some filters, but that seems to be all I can program in it. On several occasions, I heard people talk about their automated email workflow. One example: When I do not get a reply to an email the script will send a “nag” email asking why I did not get a response yet. Or another one: I get so much mail that I cannot read them all. After a week, unread email is put on hold and the sender gets a “if it was important, reply to this email and it will be set to un-hold” email. The script then takes the answer and move it to back into the important folder. I read about FiltaQuilla which seems nice, but it does not seem to be the kind of programming that I am looking for. How can I write general purpose scripts like those? Do I need to write my own Python IMAP/SMTP client (if that is even possible) to to this or can I script it it, say JavaScript, in Thunderbird?

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• Chassis fans and power LEDs still work in Hibernate

  - by Jaded

  I have ASRock Z68 Extreme3 Gen3 motherboard recently updated to 2.20 BIOS version. OS is Windows 7 x64. The problem is after that update full hibernation (by that i mean full system power off) stopped working although everything was fine before. Now when I press hibernate, sleep in initiated as usual, monitor goes to sleep, HDD and CPU fan stop spinning, but chassis fans (i have Gigabyte Aurora 3D 570 case with two rear and one front fans) still remain working. Also power leds are lit as if computer is turned on. Tried changing different UEFI settings related to sleep mode, and none of them change above described behaviour. I have "Deep Sleep" (Advanced-South Bridge Configuration) set to "Enabled in S4-S5", "Suspend to RAM" (Advanced-ACPI Configuration) set to "Auto", all fans settings in "H/W Monitor" set to "Auto".

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• How does geolocation based on IP address work?

  - by Martin

  As all Internet users, I've visited web sites which appear to know in which country and city I'm located. I understand that these web sites typically look up my IP address in a database which maps IP address to country / city which works fairly well. I've also seen companies selling this type of database. How is this database, which maps an IP address to a country / city, created in the first place? Is there a central database somewhere where each ISP registers the link between IP address and country/city? Or does the companies selling geolocation databases contact different ISP's and purchase the mapping information from them? Or is there some organization 'above' ISP's who keeps track of this?

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• how do twisted/tornado et cetera work

  - by aharon

  I understand that they work in some way distinct from making a thread per user. How exactly does that work? (Does 'non-blocking' have something to do with it?)

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• How can one machine ping another, but the reverse ping doesn't work

  - by SteveC

  I've got two VMware Workstation virtual machines running ... Virtual A can ping the host laptop most of the time, other real machines on my home network all of the time, but it gets a "request timed out" for virtual B Virtual B can ping the host laptop most of the time, and the machines, both real and virtual A all of the time The only difference I know of is virtual B has been joined to my works domain, whereas virtual A is still in workgroup mode Can anyone explain how / why this is occurring ?

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• UEFI - Linux Mint Boot from USB Doesn't work

  - by Joe Bennett

  I'm running Linux Mint (only OS other than in VirtualBox) and wanting to remove it. I've created a Live USB of Windows 8 using Windows 7 USB/DVD Download Tool - Yes, I know it says Windows 7 but I've been doing research and I am hearing from everywhere that it also works for Windows 8. The ISO was loaded on just fine (AFAIK) Computer came with Windows 8 pre-installed I have Safe boot and Fast boot disabled in the BIOS Settings I have USB as my first boot option I have tried both the USB 2.0 and 3.0 ports Yet, Mint is all that will boot up. Anybody have a similar issue? If it helps, the computer is a Toshiba Satellite S855D Laptop with an AMD APU quad-core processor (3 CPU, 1 GPU)

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• jQuery trim function does not work in IE7?

  - by YourMomzThaBomb

  I'm trying to call the jQuery text() function and run it through the trim() function to remove all trailing and leading whitespace. Seems to work great in Firefox, however, does not work in IE7 (refuses to remove a space trailing at the end). Any ideas?! Maybe a regex solution?

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• nginx reverse proxy to apache mod_wsgi doesn't work

  - by user11243

  I'm trying to run a django site with apache mod-wsgi with nginx as the front-end to reverse proxy into apache. In my Apache ports.conf file: NameVirtualHost 192.168.0.1:7000 Listen 192.168.0.1:7000 <VirtualHost 192.168.0.1:7000> DocumentRoot /var/apps/example/ ServerName example.com WSGIDaemonProcess example WSGIProcessGroup example Alias /m/ /var/apps/example/forum/skins/ Alias /upfiles/ /var/apps/example/forum/upfiles/ <Directory /var/apps/example/forum/skins> Order deny,allow Allow from all </Directory> WSGIScriptAlias / /var/apps/example/django.wsgi </VirtualHost> In my nginx config: server { listen 80; server_name example.com; location / { include /usr/local/nginx/conf/proxy.conf; proxy_pass http://192.168.0.1:7000; proxy_redirect default; root /var/apps/example/forum/skins/; } #error_page 404 /404.html; # redirect server error pages to the static page /50x.html error_page 500 502 503 504 /50x.html; location = /50x.html { root html; } } After restarting both apache and nginx, nothing works, example.com simply hangs or serves index.html in my /var/www/ folder. I'd appreciate any advice to point me in the right direction. I've tried several tutorials online to no avail.

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• Gentoo on Mac Mini - can't get framebuffer to work

  - by user42055

  I have the last Gentoo on an intel mac mini with 945G graphics. I'm trying to start X (with no config) but it complains that /dev/fb0 doesn't exist. I've tried adding the following options to the kernel boot params: video=intelfb:mode=800x600-32@60,accel,hwcursor vga=761 Because I read that the fb might not be enabled unless you set a vga= option. Unfortunately the kernel doesn't recognise that option. If I changed it to vga=ask it presents me a list of about 6 text modes no greater than 80x60. In the kernel I have agpgart, drm (using i830 module) and vga text console compiled in. What am I not doing right ?

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• Localhost doesnot work.

  - by Muhammad Sajid

  Hi, I installed wamp server on xp. During the installation it did not show any error/warning message. Then i start it & type http://localhost/ in url bar but it just show a blank page. I also checked notepad C:\WINDOWS\system32\drivers\etc\hosts their is no restriction for localhost. Help. Thanks...

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• Gentoo on Mac Mini - can't get framebuffer to work

  - by user42055

  I have the latest Gentoo on an intel mac mini with 945G graphics. I'm trying to start X (with no config) but it complains that /dev/fb0 doesn't exist. I've tried adding the following options to the kernel boot params: video=intelfb:mode=800x600-32@60,accel,hwcursor vga=761 Because I read that the fb might not be enabled unless you set a vga= option. Unfortunately the kernel doesn't recognise that option. If I changed it to vga=ask it presents me a list of about 6 text modes no greater than 80x60. In the kernel I have agpgart, drm (using i830 module) and vga text console compiled in. What am I not doing right ?

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• Citrix XenDesktop create an image to work across multiple hardware devices

  - by JohnyV

  I have created an image using this guide http://support.citrix.com/article/CTX119877. However this only works for virtual and the model that I made the image on how can i extend compatibility to another device? I am just using it for a vdisk that I can then also use as a virtual device but I wasnt the vdisk to be available over multiple devices. Using Win 7 on the client. Thanks

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• configuration of zend frame work in ubuntu

  - by Rahul Mehta

  Hi, I have created a project zfapi by zf command in ubuntu. Now http://myserverpath.com/zfapi/ gives me listing of folder public application and others. http://myserverpath.com/zfapi/public give me the index page index.php. and i have made the UserController.php in application/controllers but by http://myserverpath.com/zfapi/user/ is saying user not found. what configuration i need to set for running it proper. I had set my /etc/apache2/apache2.conf added the following in the last . <VirtualHost *:80> DocumentRoot "/var/www/mypath/zfapi" <Directory "/var/www/mypath/zfapi"> Order allow,deny Allow from all AllowOverride all </Directory> </VirtualHost> is giving me this error while restarting server. [Sat Jan 08 13:32:53 2011] [error] VirtualHost *:80 -- mixing * ports and non-* ports with a NameVirtualHost address is not supported, proceeding with undefined results apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1 for ServerName [Sat Jan 08 13:33:03 2011] [error] VirtualHost *:80 -- mixing * ports and non-* ports with a NameVirtualHost address is not supported, proceeding with undefined results what this i should do .?

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• Configure IIS site to work with host header & hosts file entry

  - by HarveySaayman

  I'm I bit of an IIS / Web noob (I'm a C# backend service / winforms dev) so please bare with me :-) I've set up a site in IIS on my local dev machine. In the bindings section of the site ive added 4 bindings, all 4 for http: Host Name Port IP Address blog.sourcecube.co.za 26581 * www.blog.sourcecube.co.za 26581 * blog.sourcecube.co.za 26581 127.0.0.1 www.blog.sourcecube.co.za 26581 127.0.0.1 in my hosts file (drivers\etc\hosts), i've added the folling entries: 127.0.0.1 blog.sourcecube.co.za 127.0.0.1 www.blog.sourcecube.co.za when i ping my domain name from the command line it does in fact resolve to the loopback address, 127.0.0.1. So what I'm expecting to happen when i navigate to blog.sourcecube.co.za in my browser is for it to resolve to 127.0.0.1, and when the request hits IIS, it should know which site to serve because of the host header? But when i navigate to blog.sourcecube.co.za, i get an "Unable to connect, Firefox can't establish a connection to the server at blog.sourcecube.co.za" error. What am I doing wrong? --- UPDATE --- Navigating to blog.sourcecube.co.za:26581 from my browser works... I'd like get it working without specifying the port number though.

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• why altgr+p doesn't work, AUTOHOTKEY

  - by voodoomsr

  Hi guys, i try and i try to find the bug in this script but i can't . Maybe some of you can give me a hint... Problem. When i press altgr&p it suppose that the Delete key is triggered, but the weird thing is that after one succesfull delete, if i continue pressing altgr&p appears the p, and the delete isn't triggered anymore. in the meantime i test other solution move to the right and then delete with the backspace, that works, but when i have text selected this alternative isn't good.... here is the code #InstallKeybdHook ;characters very used RAlt & e:: SendInput []{Left} Return RAlt & w:: SendInput <>{Left} Return RAlt & d:: SendInput (){Left} Return RAlt & s:: SendRaw {} SendInput {Left} Return RAlt & x:: SendInput ""{Left} Return RAlt & c:: SendInput ''{Left} Return RAlt & f:: SendInput * Return RAlt & r:: SendRaw + Return RAlt & v:: SendInput - Return ;comienzo y fin de linea RAlt & a:: SendInput {Home} Return RAlt & z:: SendInput {End} Return ;movimientos InEditon /* RAlt & p:: SendInput {Right}{BackSpace} Return */ <^>!p:: Send {Del} Return RAlt & o:: SendInput {Up} Return RAlt & l:: SendInput {Down} Return RAlt & k:: SendInput {Left} Return RAlt & ñ:: SendInput {Right} Return RAlt & ,:: SendInput {Enter} Return RAlt & i:: SendInput {BackSpace} Return ;; clipx ^mbutton:: sendinput ^+{insert} Return ^+k::^+Left +k::+Left ^k::Left +l::+Down ^+l::^+Down ^l::^Down +ñ::+Right ^+ñ::^+Right ^ñ::^Right +o::+Up ^+o::^+Up ^o::^Up +a::+Home ^+a::^+Home +z::+End ^+z::^+End

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• Specifying a source in puppet doesn't seem to work

  - by Mr Wilde

  I have been attempting to create a manifest for installing postgres 9.1 using puppet on a Centos 5 server. I have been trying to adapt the instructions at http://wiki.postgresql.org/wiki/YUM_Installation in order to achieve this and when I go through a manual process, I have been able to. It would seem to me therefore that a puppet manifest containing package { 'postgresql91-server': ensure => installed, source => 'http://yum.postgresql.org/9.1/redhat/rhel-5-x86_64/pgdg-centos91-9.1-4.noarch.rpm' } however on attempting to apply this manifest I get err: /Stage[main]//Package[postgresql91-server]/ensure: change from absent to present failed: Could not find package postgresql91-server Any expert puppeteers out there able to help me?

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• Rewritten URLs with parameter length > 255 don't work

  - by philfreo

  I'm using mod_rewrite to rewrite URLs like this: http://example.com/1,2,3,4/foo/ By doing this in .htaccess: RewriteRule ^([\d,]+)/foo/$ /foo.php?id=$1 [L,QSA] It works fine, except for when "1,2,3,4" turns into a string longer than 255 characters, Apache returns a "403 Forbidden". Is there some apache setting I should tweak?

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• Windows 7 Index Search does not work in Google Drive folder

  - by Joel

  I recently installed Google Drive on my Windows 7 laptop and began syncing all my files a few days ago. All was well until I needed to search for some documents in my local copy of Google Drive using Windows 7 Search feature. Windows did not return any results at all. Weirdly, when I turned off Windows indexing for that folder, it began returning results. I don't mind using windows search w/o the index but sometimes it takes too long to search (especially for keywords inside documents like Word and Excel). It's driving me nuts to the point where I have given up on Windows Search and switched to Google Drive's online search to look for files (not as convenient as I still have to go back go google drive in Windows to locate the folder). Any help appreciated!

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• How to get the basic mail command in ubuntu 10 to work

  - by Maureen Adamson

  I am a college lecturer to whom the task of supporting the students' Linux Server has fallen. My students just need to use the mail command to communicate with me and each other. I thought mail would be there by default but it wasn't. I have tried all the advice I found on the Internet and tried to install mailutils, sendmail, mailx, exim4 and postfix. There were more but I can't remember them all now. After installing (if it works - some of them don't), when I try to send a message they all give me: /usr/sbin/sendmail: file or directory not found. I don't need anything fancy - we don't need to access remote email, just locally on our server. Incidentally the same problems are occurring on the physical server and my test virtual machine, installed at different times but both Ubuntu 10. Can anyone help me?

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• ISS7 authentication doesn't work on servername

  - by nLL

  Not sure if I put correct title but here is my problem: Local (home network) IIS 7, default web site bind to any IP on port 81, Anonymous Auth disabled, Windows Auth enabled If I go to 192.168.1.101:81/ I get asked for username and password. If I go to server:81/ nothing is being asked regardless whether connecting from local or another machine on the network. Why is that? Am I doing something wrong?

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