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  • Use GRUB/GRUB2 to PXE boot OS image

    - by Jack
    Asked this in stackoverflow but they recommended I post this here: Here is the situation I am in: I currently have a Windows drive that boots XP. The BIOS does not support PXE booting so this is out of the question. Therefore, I was thinking I could install a customized GRUB bootloader on it instead such that it will have the option to PXE boot an image from a DHCP server connected to it and have the option to load Windows as it normally does (two items in menu). The catch is it may need to be automated (meaning no keyboard), so is there any way to run a script pre-boot during GRUB loading that determines if DHCP / TFTP servers are running and attempt to PXE boot an image from the network (and if not, say timeout of 10 seconds, regularly boot from Windows drive)? If this is not possible, what are some other options / suggestions? I was reading up on grub4dos as well but I'm not sure that is what I need. FWIW, I'm free to do whatever I want to the drive. I'd really appreciate some help on this as I'm not sure where to start. Thanks!

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  • Preventing my postfix to send my local users spam

    - by Jack
    I have a postfix/dovecot mail server with 100 different users. When they send an email they need to be authenticated. I successfully use saslauth to achieve this. Few days ago I had a problem. One specific user, probably with a virus or a spam-bot installed in its computer, started to send out through my server thousands of emails in few hours. As result, my ip has been blocked by many isp provider (@aol, @yahoo, and others) and has been listed in many blacklist, making all my 100 users unable to send any email to anyone. What is the best practice to avoid this problem? It would be great if my server could recognize a spamming user and automatically block it. Also, have a limit of, say, 30 emails per hour could be a partial solution. Any idea how to face this problem? Thank you

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  • nginx doesn't find the directory but apache does

    - by Jack Spairow
    I use apache as the backend server and nginx on the frontend. Apache listens to port 8080 and nginx to port 80. What I do is have the root point to the public folder foreach virtualhost: <VirtualHost *:8080> ServerAdmin webmaster@localhost ServerName site.com ServerAlias site.com *.site.com DocumentRoot /var/www/site.com/public <Directory /> Options FollowSymLinks AllowOverride None </Directory> <Directory /var/www/site.com/public/> Options Indexes FollowSymLinks MultiViews AllowOverride All Order allow,deny allow from all </Directory> </VirtualHost> And here's the nginx config: server { listen 80; access_log /var/log/nginx.access.log; error_log /var/log/nginx.error.log; root /var/www/site.com/public; index index.php index.html; server_name site.com *.site.com; location / { location / { proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header Host $host; proxy_pass http://127.0.0.1:8080; proxy_cache one; proxy_cache_use_stale error timeout invalid_header updating; proxy_cache_key $scheme$host$request_uri; proxy_cache_valid 200 301 302 20m; proxy_cache_valid 404 1m; proxy_cache_valid any 15m; } } location ~ /\.(ht|git) { deny all; } } The problem is Apache resolves the domain just fine (site.com:8080), but nginx shows instead a 502 Bad Gateway (site.com:80). I tried looking at the error_log and access_log but I can't find any hint for why can't nginx work. EDIT: The problem was I wasn't able to include that isolated config for nginx.

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  • Installation fails after period of time

    - by Jack Marchetti
    I'm running Windows 7 64 bit, Ultimate. I'm running into a problem where, if my computer is on long enough, I am unable to install any software. For example, if I reboot and try to install something, for the most part, it will succeed. if I try and install something after a few hours/days, it will always fail. Sometimes stating that "a previous install failed..." or "an install is already taking place..." even though there is nothing being installed. This also seems to be making my Windows updates fail at a pretty regular rate. Any ideas?

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  • Why did my mouse/trackpad suddenly stop working on my MacBook under Windows XP?

    - by Jack B Nimble
    My mouse and track pad have suddenly stopped working on my MacBook, which is running Windows XP from BootCamp. Both the USB mouse and the trackpad work fine in OS X. The device manager says that the driver is missing or corrupt on both items (they have a yellow exclamation point). I tried uninstalling the mice, and reinstalling them. Since the USB mouse is a Logitech I tried replacing the driver with one downloaded from Logitech.com. Anyone know how I can repair the mouse driver that Windows XP is using?

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  • How to restore ubuntu boot loader

    - by jack
    Hi I recently installed Ubuntu. It lets me to use GParted to let me take free space from Windows XP partition. After installing Ubuntu, it nicely presents a boot menu that lets me to boot either UBuntu or XP. Now, my XP sucks and I need to remove/re-install it. Then how can I restore the boot menu of Ubuntu? Thank you.

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  • Download from http server all directories,files and subdirectories and so on

    - by Jack
    I want to download from remote http server all files directories,files and so on. I found some solutions to ftp server,but doesn't work to http. Until now no luck with wget -r or -m. It download all direcotories in the root and the respective index.html. Not all files and sub-directory under such it(note the sub-directory may have another directory and so on) not sure on tags fix for me if needs. Note: I'm not a native english speaker,sorry for bad english.

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  • How can I rewrite a URL and pass on the original URL as a parameter?

    - by Bobby Jack
    I'm building a site that needs to include a 'check' procedure, to do several initiation tasks for a user's session. Examples include checking whether they're accepting cookies, determining if their IP address grants them specific privileges, etc. Once the check is complete, I need to redirect the user back to the page they originally requested. The plan is to use RewriteCond and map all URLs to an 'initiator' if the user doesn't have a specific cookie set. Let's say I want to rewrite all URLs (ultimately, with some conditions, of course) to: /foo?original_url=... Where the ... is the original URL requested, URL-encoded. The closest I've got is this: RewriteRule ^(.*)$ http://localhost/php/cookie.php$1 [R=301] I can then inspect the original URL, captured in the backreference, via PATH_INFO. However, this is pretty messy - I would much prefer to pass that value as a URL parameter

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  • lilo.conf questions

    - by Jack
    I use lilo, and have two different kernels. One is newer and use KMS with it. What I would like to do, is to be able to set vga=xxx for only one of the kernels. Is this possible? I would also like to be able to code into lilo.conf options that I pass on the commandline, but am unsure how to do this

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  • How can I automate restarting a vmware vm

    - by Stu
    I have a vm that does nothing but run magic jack. Magic jack doesn't run perfectly in a vm. It works great for days then randomly the vm reboots. except it doesn't come up clean. It gets to the windows splash screen and hangs spinning the cpu. I don't care how I solve the problem (although not crashing in the first place would be ideal) but I just need the vm to reboot cleanly when it does crash. Is there a windows registry setting I can say "on crash, reboot" or something like that?

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  • Apache load balancer with https real servers and client certificates

    - by Jack Scheible
    Our network requirements state that ALL network traffic must be encrypted. The network configuration looks like this: ------------ /-- https --> | server 1 | / ------------ |------------| |---------------|/ ------------ | Client | --- https --> | Load Balancer | ---- https --> | server 2 | |------------| |---------------|\ ------------ \ ------------ \-- https --> | server 3 | ------------ And it has to pass client certificates. I've got a config that can do load balancing with in-the-clear real servers: <VirtualHost *:8666> DocumentRoot "/usr/local/apache/ssl_html" ServerName vmbigip1 ServerAdmin [email protected] DirectoryIndex index.html <Proxy *> Order deny,allow Allow from all </Proxy> SSLEngine on SSLProxyEngine On SSLCertificateFile /usr/local/apache/conf/server.crt SSLCertificateKeyFile /usr/local/apache/conf/server.key <Proxy balancer://mycluster> BalancerMember http://1.2.3.1:80 BalancerMember http://1.2.3.2:80 # technically we aren't blocking anyone, but could here Order Deny,Allow Deny from none Allow from all # Load Balancer Settings # A simple Round Robin load balancer. ProxySet lbmethod=byrequests </Proxy> # balancer-manager # This tool is built into the mod_proxy_balancer module allows you # to do simple mods to the balanced group via a gui web interface. <Location /balancer-manager> SetHandler balancer-manager Order deny,allow Allow from all </Location> ProxyRequests Off ProxyPreserveHost On # Point of Balance # Allows you to explicitly name the location in the site to be # balanced, here we will balance "/" or everything in the site. ProxyPass /balancer-manager ! ProxyPass / balancer://mycluster/ stickysession=JSESSIONID </VirtualHost> What I need is for the servers in my load balancer to be BalancerMember https://1.2.3.1:443 BalancerMember https://1.2.3.2:443 But that does not work. I get SSL negotiation errors. Even when I do get that to work, I will need to pass client certificates. Any help would be appreciated.

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  • Joomla performance problems on AWS

    - by Bobby Jack
    I'm running a site on AWS with the following setup: Single m1.small instance (web server) Single RDS m1.small db Joomla 1.5 Generally, the site is performant, but is fairly low-traffic - say around 50-100 visits / hour. However, at peak time, we see about double that traffic. During peak time, pretty much every day: CPU usage on the web server slowly climbs to 100% CPU usage on the RDS server climbs quite quickly to about 30%, from an average of about 15 Database connections shoot up to about 140, from a normal average of about 2 or 3 The site is then occasionally unreachable, certainly according to pingdom monitoring. Does anyone recognise this behaviour? Can you point me in the right direction to begin investigating? Of course, RDS makes it difficult to do things like slow query logging, so I've started by regularly dumping the mysql process list into a file to see if there's anything I can spot there, but it would be good to have something more concrete to investigate. UPDATE At least, can someone confirm that I'm definitely right in saying that the level of traffic implies the problem must be a specific type of query taking way longer than it should to execute? This would happen if a table gets locked, and many queries need to write to it, right? For this very reason, I've already changed the __session table type to InnoDB.

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  • File server share access intermittent/slow/machine unstable: win2k8r2

    - by Jack B.
    I have a file server running Win2k8R2 on an older HP DL380G4. It has nothing set up on it other than file sharing. All drivers/firmware/updates installed. The file server is used as a dump for a bunch of test machines - so essentially a lot of small files are being written to it. It was working fine until it started showing the following symptoms: Shares became either very slow/intermittent or could not access them at all. Logging in the the server, you could use it like normal but windows would start freezing and eventually you had to hard reboot it because nothing was responsive. After rebooting, it would work fine for 20min-2hours and then degrade into this broken state again. Some info after investigation: HP Raid Config utility shows the Raid array as functioning properly (RAID5 btw). Event log shows a bunch of DoS attacks from the test machines, saying it has disconnected the connection a. AFAIK (not part of my job) the test machines haven't changed the way they log information to this server or the amount of them hasn't increased. b. Nothing is infected, this server was scanned fully, and the test machines are re-imaged almost daily. Nothing in performance monitor shows as anything being pegged at maximum (CPU/HD/Network/RAM) I installed MS Network Monitor and it is showing a lot of traffic The server was using one gigabit Ethernet connection, I connected the second one as well with the same results. Forgot to add - one of the commonly written to dirs on the share has over 16k subdirs in it, with a crapton of small files within those dirs. Some of the OS instability was slow access to the drive which has this directory - perfmon doesn't show much activity on the HD though so I'm not sure if this crowded dir is the cause. Here is one important fact: I ran into this issue 2-3 months ago, couldn't figure it out, but I had a spare identical machine so I swapped them out (thought it was related to the machine), and now I have the same issue. Also, the computer will be stable if I turn off file sharing. So is the server just getting DoS'd by the test machines? I've never dealt with such an issue. Is instability in the server's OS common when getting DoS'd? Is there anything I can do to confirm this before telling the owners of the test machines to optimize their traffic? (I'm not sure what they'll be able to do). Is there something within Win2k8R2 that can balance the traffic across the two NICs? Any help would be appreciated. Update: Another thought - the drive with the share is RAID5 across 6 SCSI320 300GB HDs. They are near full capacity about 100GB from 1TB left. Could the amount of tiny files could be causing some weirdness with the parity in this array? I think I've read something about this in the past but I'm no expert on RAID.

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  • mod_ReWrite to remove part of a URL

    - by Jack
    Someone has incorrectly linked to some of my urls causing 404 erros in Google Webmaster Tools. Here is an example Linked URL: http://www.example.com/foo-%E2%80%8Bbar.html Correct URL: http://www.example.com/foor-bar.html I would like to 301 redirect any instance of this kind of incorrect linking to the correct URL. I have tried the following but it generates 404 Errors site wide. Options +FollowSymLinks RewriteEngine on RewriteRule ^foo-(.*)bar\.html$ http://www.example.com/foo-bar\.html? [L,R=301] Could anyone let me know what I am doing wrong?

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  • File server share access intermittent/slow/machine unstable: win2kr2

    - by Jack B.
    I have a file server running Win2k8R2 on an older HP DL380G4. It has nothing set up on it other than file sharing. All drivers/firmware/updates installed. The file server is used as a dump for a bunch of test machines - so essentially a lot of small files are being written to it. It was working fine until it started showing the following symptoms: Shares became either very slow/intermittent or could not access them at all. Logging in the the server, you could use it like normal but windows would start freezing and eventually you had to hard reboot it because nothing was responsive. After rebooting, it would work fine for 20min-2hours and then degrade into this broken state again. Some info after investigation: HP Raid Config utility shows the Raid array as functioning properly (RAID5 btw). Event log shows a bunch of DoS attacks from the test machines, saying it has disconnected the connection a. AFAIK (not part of my job) the test machines haven't changed the way they log information to this server or the amount of them hasn't increased. b. Nothing is infected, this server was scanned fully, and the test machines are re-imaged almost daily. Nothing in performance monitor shows as anything being pegged at maximum (CPU/HD/Network/RAM) I installed MS Network Monitor and it is showing a lot of traffic The server was using one gigabit Ethernet connection, I connected the second one as well with the same results. Forgot to add - one of the commonly written to dirs on the share has over 16k subdirs in it, with a crapton of small files within those dirs. Some of the OS instability was slow access to the drive which has this directory - perfmon doesn't show much activity on the HD though so I'm not sure if this crowded dir is the cause. Here is one important fact: I ran into this issue 2-3 months ago, couldn't figure it out, but I had a spare identical machine so I swapped them out (thought it was related to the machine), and now I have the same issue. Also, the computer will be stable if I turn off file sharing. So is the server just getting DoS'd by the test machines? I've never dealt with such an issue. Is instability in the server's OS common when getting DoS'd? Is there anything I can do to confirm this before telling the owners of the test machines to optimize their traffic? (I'm not sure what they'll be able to do). Is there something within Win2k8R2 that can balance the traffic across the two NICs? Any help would be appreciated. Update: Another thought - the drive with the share is RAID5 across 6 SCSI320 300GB HDs. They are near full capacity about 100GB from 1TB left. Could the amount of tiny files could be causing some weirdness with the parity in this array? I think I've read something about this in the past but I'm no expert on RAID.

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  • Mod_rewrite delete parameter in 301 Redirect

    - by Jack
    Hi, How would I go about rewriting: http://www.example.com/foo.html?order=desc&limit=all&something=else to http://www.example.com/foo.html?order=desc&something=else I want to remove all instances on limit=all regardless of how many other parameters in the url. I have tried: RewriteCond %{QUERY_STRING} ^(.*&)&limit=all(&.*)?$ [NC] RewriteRule ^foo\.html$ /foo\.html\?%1%2 [R=301,L]

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  • How can I read PDFs with e-reader on a Lenovo tablet?

    - by Jack M
    This is my first time using a tablet and I'm totally lost - this must be what computers look like to old people. This is a Lenovo Thinkpad tablet. I don't see a specific model number on it (it was passed down to me second hand). What I'd like to do is read a PDF. I'm fairly certain I successfully transferred the PDF onto the tablet via an SD card, and I noticed this thing has an app called "eReader" on it, so I started that up. All I see are empty bookshelves, and no obvious buttons or settings anywhere. I saw in multiple places that you have to, as one site puts it: ...copy and paste the relevant files into the eBooks folder and they will appear on the eReader shelf for your consumption... But I have no idea how to: Access the file system. Locate the eBooks folder. Copy and paste files. Will I need a file explorer app? If so, how can I install that given that my only method of getting data onto this tablet is an SD card (no wireless internet).

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  • GNU Emacs is crashing with -nw

    - by Jack
    When I run emacs with -nw option, the emacs really open, but I can't do more nothing. As if the user input is blocked and no keyboard signal is received and/or interpreted. I've tried run without load .emacs file and some other behaviors: emacs -nw -Q --no-desktop --debug-ini foo.c But makes no difference and strangely the GUI-version(using Gtk) is working fine. My gnu-emacs version is GNU Emacs 23.3.1 Any help to help to fix it is very appreciated.

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  • Hidden bootloader

    - by Jack
    I need a bootloader that will work as described: I want my computer to boot Windows, that is my main OS installed on a primary bootable partition. However, I'd like to have a 2-3 second span with blinking cursor, before Windows starts. If I press any key in that period it should launch Ubuntu from a small Truecrypt-encoded partition, upon providing a correct password. In other words I'm looking for a hidden bootloader that would expose itself only when a key is pressed during a certain time. Do you happen to know anything like that?

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  • Windows 7 Tray Application

    - by Cpt. Jack
    When I launch an application in Windows 7, it shows up in the tray but no where on my main screen. When I hover over it and select the application, nothing shows up. In order to make the application visible, I need to hover over it, right click and select maximize. Anytime I maximize the screen and then select to make it a smaller window, it also disappears. This is an awfully painful process in judst trying to launch the application. Please help me figure out how to change this to make sure th applicationalways opens into a maximized screen.

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  • Convert Chinese character .wav song into .mp3 or .wma on English OS

    - by Jack
    I have bunch of Chinese .wav files on my hard disk that I'm trying to convert into .mp3 with Audacity but it appear that Audacity can not read Chinese character songs but the .wav file display correctly on my 32 bits Win7 Ultimate(English) pc. I have to rename these Chinese character songs into English file name in order to convert them. Does anyone know if there is any software (prefer open source) that will take Chinese character file name(.wav) and convert it into .mp3 without renaming the file?

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  • Problem with java on Windows

    - by Jack
    I had installed jdk-6u18-windows-i586 on my machine. Later on I uninstalled it and installed jdk 1.5.0_13 instead. Now when I do javac -version I get jdk 1.5.0_13 But when I do java -version I get java version "1.6.0_19" How do I fix this?

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