Some usefull IT tips

Recently I’ve bought ssd drive for my notebook and 2.5″ Enclosure for the old hdd.

My 2.5″ Enclosure has no switch on/off, so … to turn it off I have to plug and unplug the usb cable, but … there’s a better way

All I need to do is to install sg3-utils, and use two simple commands to turn off/on my external usb drive.

apt-get install sg3-utils

and to turn it off/on

sg_start /dev/sdb –stop
sg_start /dev/sdb –start

that’s all!

How to move all MySQL databases to a new server in a few simple steps.

Let’s assume your original location of mysql is at /media/disk/…
Your new location of mysql is at /
You just need to synchronize two directories /etc/mysql and /var/lib/mysql/. Remember to stop mysql before doing this, and start it after synchronisation.

/etc/init.d/mysql stop
rsync -rav /media/disk/var/lib/mysql/* /var/lib/mysql/
rsync -rav /etc/mysql/* /etc/mysql/
/etc/init.d/mysql start

that’s all!

Lat week, I installed Firefox 3 final release I use lots of very usefull addons with my Firefox 2, and unfortunately some of them were disabled after upgrading from FF2 to FF3.

After some Googling, I found something that solved my problem.

The solution on How to Force Enable Incompatible Extensions In Firefox 3 is very simple:

• Type about:config into Firefox’s address bar
• Right-click anywhere. Choose New>Boolean. Make the name of your new config value extensions.checkCompatibility and set it to false.
• Make another new boolean pair called extensions.checkUpdateSecurity and set the value to false
• Restart Firefox.
• Now, you can activate your incompatible extension, and check if it works with Firefox 3

That’s all

What to do if you got this error on 64bit linux distro, you’ve downloaded skype static and you’ve copied libsigc-2.0.so.0 and libsigc-2.0.so.0.0.0 to /lib32?:

that was wrong! - and the error is:

skype: error while loading shared libraries: libsigc-2.0.so.0: wrong ELF class: ELFCLASS64

Solution is quite simple - just wget libsigc++-2.0-0c2a_2.0.16-3_i386.deb (or some other version appropriate to your distro (remember to get 32bit version!).

After downloading go into libsigc++-2.0-0c2a_2.0.16-3_i386.deb/CONTENT/usr/lib

and unpack libsigc-2.0.so.0 and libsigc-2.0.so.0.0.0 to /lib32

That’s all!

What to do if you got this error on 64bit linux distro and you’ve downloaded skype static?:

skype: error while loading shared libraries: libsigc-2.0.so.0: cannot open shared object file: No such file or directory

Solution is quite simple - just wget libsigc++-2.0-0c2a_2.0.16-3_i386.deb (or some other version appropriate to your distro (remember to get 32bit version!).

After downloading go into libsigc++-2.0-0c2a_2.0.16-3_i386.deb/CONTENT/usr/lib

and unpack libsigc-2.0.so.0 and libsigc-2.0.so.0.0.0 to /lib32

That’s all!

It’s very eay to check uuid, just ls some dir ;-):

ls -l /dev/disk/by-uuid/

that’s all!

How to uninstall Google Desktop for Linux?

If you use Fedora, Mandrake or some other rpm based linux distro:

run the command: rpm -e google-desktop-linux

If you use Debian, Ubuntu, Kubuntu or some other deb based linux distro:

run the command: dpkg -r google-desktop-linux

You get:

FATAL: Could not determine fully qualified hostname. Please set ‘visible_hostname’
After installing squid (=after apt-getting squid on Ubuntu)

Solution is very simple.

Open your squid.conf file (/etc/squid/squid.conf) find out visible_hostname and put any name after visible_hostname:

visible_hostname myLocalDesktopComputer

That’s all.

Couldn’t open: /dev/mga_vid, Error opening/initializing the selected video_out (-vo) device.

i u got this error while trying mplayer to play video on Linux (Kubuntu, Ubuntu or other).

The solution is very simple:

Right click on mplayer window, go to preferences and oopen Video tab and choose correct driver. If you use OpenGL gl driver should be OK.

Everything You Always Wanted to Know About RAID in Linux But Were Afraid to Ask

What you need:
mdadm

mdadm is a tool for managing Linux Software RAID arrays, it can create, assemble, report on, and monitor arrays.
You cant find in your distro (use your distro’s package manager to install it) or at: http://neilb.web.cse.unsw.edu.au/source/mdadm/ or http://www.kernel.org/pub/linux/utils/raid/mdadm/ or any of the kernel.org mirrors.

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