Category: IT

IT

Buffalo WZR-HP-AG300H: Upgrade the firmware

In order for vlans to work correctly with the Buffalo WZR-HP-AG300H access point, you must upgrade the firmware to (at least) build 19154 of DD-WRT. I think it's some kind of bug that causes ARP replies to be filtered.

I copied the config of one AP to another to find that it didn't work on that device. When comparing the config of both devices, I noticed that the APs were running different versions of the firmware. I do vaguely recall that I updated the firmware of one AP. When the firmware was applied to the other AP as well, all problems were gone right away.

© GeekLabInfo Buffalo WZR-HP-AG300H: Upgrade the firmware is a post from GeekLab.info. You are free to copy materials from GeekLab.info, but you are required to link back to http://www.geeklab.info

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IT

Preupgrade – the root for the previously installed system was not found

Today, I've been digging through forums, log files and python scripts for about 16 hours (!!!) to update my system from Fedora 16 to Fedora 17. Apart from the fact that preupgrade for some reason downloaded all files from US mirrors (I'm in .nl), one of the biggest problems I had was the clear message "The root for the previously installed system was not found".

Why the fsck could it not find my installation? Was it the Luks full disk encryption? Or possibly the LVM volume manager? It couldn't be the btrfs filesystem, could it?

I tried everything possible, and when I was about to give up, I read this message that preupgrade has a problem with btrfs snapshots. Do I have these snapshots?

cryptsetup luksOpen /dev/sda2 disk
lvchange -ay vg_hdd/lv_root
mount /dev/mapper/vg_hdd-lv_root /mnt
btrfs subvolume list /mnt

There was the answer. I did. Two snapshots created by yum.

btrfs subvolume delete /mnt/yum-2012....1
btrfs subvolume delete /mnt/yum-2012....2
umount /mnt
lvchange -an vg_hdd/lv_root
cryptsetup luksClose disk

Damn, this has been a great day. Thanks to those crappy error messages. Time to go to bed.

© GeekLabInfo Preupgrade - the root for the previously installed system was not found is a post from GeekLab.info. You are free to copy materials from GeekLab.info, but you are required to link back to http://www.geeklab.info

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IT

Change the color of selected text

A nifty little detail in html5 is that you can change the color of selected text, which is usually blue. It's just one of those details that webdesigners usually forget.

You can change the color of the selection using the following css:

::selection {
    background-color: red;
    color: #fff;
}
::-moz-selection {
    background-color: red;
    color: #fff;
}

The ::selection is used by most modern browsers, except for Firefox. The latter uses its own selector ::-moz-selection. I read an article that wrote they cannot be combined. As such, the following will NOT work:

::selection, ::-moz-selection { /* You can't combine like this */
    background-color: red;
    color: #fff;
}
© GeekLabInfo Change the color of selected text is a post from GeekLab.info. You are free to copy materials from GeekLab.info, but you are required to link back to http://www.geeklab.info

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IT

Windows 7: Using symbolic links

Linux and unix have had this nifty little feature called symlinks (symbolic links) for decades. Windows has finally caught up with the new command mklink.

Windows Vista introduced the new command mklink, which was expanded in Windows 7.

Syntax

MKLINK [[/D] | [/H] | [/J]] Link Target
 
        /D      Creates a directory symbolic link.  Default is a file
                symbolic link.
        /H      Creates a hard link instead of a symbolic link.
        /J      Creates a Directory Junction.
        Link    specifies the new symbolic link name.
        Target  specifies the path (relative or absolute) that the new link
                refers to.

Examples

Link d:\myfile.txt (the file) to c:\something.txt (the link):

mklink c:\something.txt d:\myfile.txt

Make some crappy old program save its data to your fileserver directly by linking \\fileserver\data (target) to c:\program files\crappy-old-program\data (the directory).

mklink "c:\program files\crappy-old-program\data" \\fileserver\data /d
© GeekLabInfo Windows 7: Using symbolic links is a post from GeekLab.info. You are free to copy materials from GeekLab.info, but you are required to link back to http://www.geeklab.info

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IT

Varnish cache: how to detect IPv6

The following VCL code detects if the client is connected using IPv6:

acl isipv6{                     

        "::"/0;

}                       

sub vcl_recv {          

    # [... whatever rules you like ...]

    if(server.ip ~ isipv6){

        # [... whatever rules you like ...]

    }

    # [... whatever rules you like ...]

}

You may want to use that for example for a "you're ipv6 enabled" banner.

© GeekLabInfo Varnish cache: how to detect IPv6 is a post from GeekLab.info. You are free to copy materials from GeekLab.info, but you are required to link back to http://www.geeklab.info

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IT

GTK and KDE: unreadable fonts

I just found a note from several years back. Since it may someday be handy to someone, I'm posting it here:

KDE somewhat integrates GTK applications. These applications will get the color schemes from KDE. Sometimes fonts in menu's get rendered unreadable by this.

Wrong styles are defined in /opt/gnome/share/themes/Qt/gtk-2.0/gtkrc:

style "default"

{

  engine "qtengine"

  {

  }

}

class "GtkWidget" style "default"

Disabling this whole block fixed my problem.

© GeekLabInfo GTK and KDE: unreadable fonts is a post from GeekLab.info. You are free to copy materials from GeekLab.info, but you are required to link back to http://www.geeklab.info

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