Apparently the problem is caused when GRUB tries to load the next stage of the bootloader, but fails to load it and instead hangs in an infinite loop because it can’t read out of the next stage. However in our case the BIOS settings were perfectly fine and there was nothing wrong with that. It turns out that the actual problem lying below the infinite loop was that the GRUB bootloader was corrupted and had to be reinstalled.

Prerequisites

• Floppy drive & real 3.5 inch floppy
• Download the grub boot floppy (1.44 MB)
• Write the floppy image to a real floppy, if you are on Linux you can simply dd if=bootgrub.img of=/dev/fd0 whereas if you are on windows you can use something like rawrite to write out the image.

Steps

1. Boot your computer from floppy.
2. Once the floppy has fully loaded with the menu, press “c” on your keyboard to enter the command prompt.
3. Type in the following commands:

   find /boot/grub/stage1

   Skip the (fd0) entry that it produces and note down the one that matches your /boot partition. If it does not find it, then note down your /boot partition in the form of (hdx,y) where x is the hard disk number and y is the partition number. For example, (hd0,0) is equivalent to /dev/sda1 in Linux.

4. Type in the following:

   root (hd<strong>x</strong>, <strong>y</strong>)

   where thew (hdx,y) is the location of /boot (from above command).

5. Set up grub and reboot:

   setup (hd0)
   reboot

   If you wish to install grub to different drive, you can do so by changing hd0 to hd + your hd number.

6. Remove floppy.

Errors

If you receive “Read Error” while starting the floppy you should double check your floppy and floppy drive for errors.

Prerequisites

Install packages apache2, libapache2-mod-proxy-html:

sudo apt-get install apache2 libapache2-mod-proxy-html

Process

1. Enable the the Apache mod_proxy as it is not enabled by default:

   sudo a2enmod proxy_http

2. Add a reverse proxy pass to the configuration. Open /etc/apache2/sites-available/default with your favourite text editor and add the following text:

   <VirtualHost *:80>
       <Proxy *>
        Order Deny,Allow
        Allow from all
       </Proxy>
   
    ServerName fooserver.example.com
   
    ProxyRequests Off
    ProxyPass / http://192.168.42.3/
    ProxyPassReverse / http://192.168.42.3/
   </VirtualHost>
   

   Replace fooserver.example.com with your own domain name, and replace 192.168.42.3 with the internal IP address of your server (keep the http:// portion).

3. Restart Apache 2:

   sudo /etc/init.d/apache2 restart

4. Using your hosting provider’s DNS tool, point your domain name (fooserver.example.com) to your public IP.
5. You’re done! To test, visit your domain name and it should bring you the website on your internal server.

Prerequisities

Apache 2 should have already been installed and configured with SSL – if not, see the Ubuntu Server Guide for more details. Install the packages subversion and libapache2-svn:

sudo apt-get install subversion libapache2-svn

Setting up

1. Create a home for the Subversion files:

   sudo mkdir -p /var/svn

2. Open up /etc/apache2/mods-available/dav_svn.conf in your favourite text editor of choice, and add the following text at the bottom (ignore anything already there):

   <Location /svn>
        DAV svn
        SVNParentPath /var/svn
        SVNListParentPath On
        AuthType Basic
        AuthName "Subversion Repository"
        AuthUserFile /etc/subversion/passwd
        <LimitExcept GET PROPFIND OPTIONS REPORT>
           Require valid-user
        </LimitExcept>
     </Location></pre>

3. Add a user to the Subversion – if you don’t, you may end up with strange errors like “svn: Server sent unexpected return value (500 Internal Server Error) in response to MKACTIVITY request” when trying to commit.

   sudo htpasswd -c /etc/subversion/passwd admin

   It will prompt for a password – just give it something.

4. You’re good to go – although without any projects the server won’t have anything to commit to. Add a project to the server:

   sudo mkdir -p /var/svn/project
   sudo svnadmin create /var/svn/project

Results/Errors

svn commit -m nomsg test1 test2  --username=root --password=top_secret_root_password_here

svn: Commit failed (details follow):
svn: Server sent unexpected return value (500 Internal Server Error) in response
 to MKACTIVITY request for '/svn/project/!svn/act/53aca034-c64b-5b41-8bf4-
2715d91af049'

This error is because you do not have a valid login passed to the server, although it could use a much, much more descriptive message than “Internal Server Error”. Remember the login is not the Unix login, but instead the login created with htpassed.

svn commit -m nomsg test01 test02 --user
name=admin  --password=password_createdby_htpasswd_here

Adding         test01
Adding         test02

Committed revision 1.

object.reload( [bReloadSource])

Reloads the current page

There’s just one small problem – it’s actually object.reload, not object.refresh! Some poor quality websites (or popular websites which make mistakes) accidently specify location.refresh instead of location.reload. So instead of calling location.refresh(), one should call the following to refresh the page:

window.location.reload();

Prerequisites

• Uninstall any old versions of Roadsend PHP and bigloo on your computer.
• Install the packages libgtk2.0-0, libpcre3, libfcgi, libmysqlclient15off and libsqlite3-0 like such:

  sudo apt-get install libgtk2.0-0 libpcre3 libfcgi libmysqlclient15off libsqlite3-0
  

• Install unofficial bigloo and set up the bigloo symlink like such:

  sudo ln -s / /z

Procedure

1. Download and install the Roadsend PHP binary package:
   • roadsend-php-unofficial.deb (4.8 MB)

   Note that the Roadsend PHP debugger (pdb) has been renamed to (roadsend-pdb) due to naming conflict with python.

2. Create a test PHP file with the following content, and save it as hello.php:

   <?php
   
   // Roadsend PHP testing program
   $words = Array("Hello", "World", "from", "Roadsend PHP!");
   $sentence = implode(" ",$words);
   echo $sentence . "\n";
   exit(0);
   
   ?>

3. Run:

   pcc hello.php

   to generate a hello executable. Test this executable by running:

   ./hello

   The output of the program should read:

   Hello World from Roadsend PHP!

4. Now we will test the MicroServer backend, which is a small embedded webserver that allows you to turn your PHP application into a stand-alone webserver:

   pcc -s hello-server --port 44444 hello.php

   to generate the hello-server webserver. Now, we will try to visit the MicroServer:

   ./hello-server

   The server should be up and running by this point. Now point your browser at http://127.0.0.1:44444/hello.php and watch your PHP turn itself into a webserver without Apache.

Adding Columns of Data

DataTable dt = new DataTable("Tablename");
dt.Columns.Add("Column1");
dt.Columns.Add("Column2");
dt.Columns.Add("Column3");
// for every row
DataRow dr = dt.NewRow();
dr["Column1"] = "Testing";
dr["Column2"] = "Blah";
dr["Column3"] = "Big Blah";
dt.Rows.Add(dr);

Binding the Data (and storage across sessions)

DataView dv = new DataView(dt);
Session["data"] = dv;
gridviewctrl.DataSource = dv;
gridviewctrl.DataBind();

Paging
Note: This needs AllowPaging to be set to “true”. The following code goes in the “PageIndexChanging” callback.

gridviewctrl.PageIndex = e.NewPageIndex;
gridviewctrl.DataSource = Session["data"];
gridviewctrl.DataBind();

Sorting
Note: This needs AllowSorting to be set to “true”. The following code goes in the “Sorting” callback.

string dir;
if (e.SortDirection == SortDirection.Ascending) {
    dir = "ASC";
} else {
    dir = "DESC";
}
((DataView)Session["Data"]).Sort = e.SortExpression + " " + dir;
gridviewctrl.DataSource = Session["data"];
gridviewctrl.DataBind();

<asp:ButtonField>s
Create a <asp:ButtonField> declaration as follows: <asp:ButtonField ButtonType=”Button” Text=”Button Text Here” CommandName=”DoSomething” />

if (e.CommandName == "DoSomething") {
    // get Index
    int index = Convert.ToInt32(e.CommandArgument);
    string test = ((DataView)Session["Data"]).Table.Rows[index]["Column1"];
    Response.Redirect("http://www.google.com/search?q=" + oid.ToString()");
}

1. Try to recreate the Memberships database (ASPNETDB) – it may be corrupt or inaccessible:

   C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_regsql -S . -E -A mrpc

2. If that does not resolve the problem for you, the you should check in your web.config file to see if added “Initial Catalog=aspnetdb” somewhere in your web.config file like this:

   Data source=.;Integrated Security=True;Initial Catalog=aspnetdb

3. Restart IIS.

Handler “PageHandlerFactory-Integrated” has a bad module “ManagedPipelineHandler”

It means that you haven not yet run the aspnet_iisreg.exe executable needed to register the ASP.NET 4 framework with the IIS 7 webserver. In order to do so, open a command prompt and type in the following:

C:\windows\Microsoft.NET\Framework\v4.0.30319\aspnet_regiis.exe -i

Substitute v4.0.30319 for what other past or future ASP.NET versions. To uninstall the ASP.NET 4 (e.g. for when you are done playing around with it and would like to do some work):

c:\windows\Microsoft.NET\Framework\v4.0.30319\aspnet_regiis.exe -u

To resolve this, make sure there are no copies of the page in the same folder (such as things like backup files, accidental copies, etc) in the same folder. Either move them to a different folder or rename their extensions: .aspx to .aspxold and .cs to .csold.

To get the UUID of a partition:

blkid /dev/<em>xxxx</em> -s UUID

and it will output something like this:

/dev/<em>xxxx</em>: UUID="1fa6e8df-f05a-4c7c-b30a-cd3c1b2bcebd"

and then you can use the UUID to add a line in /etc/fstab:

UUID=1fa6e8df-f05a-4c7c-b30a-cd3c1b2bcebd	/media/mountpoint	ext4	defaults	0	1