24 March, 2010

Debian Wi-Fi hotspot using CoovaChilli, FreeRadius, MySQL and daloRADIUS

I decide to create hotspot from my server to allow other connect to Internet for free. I used "Captive portal" solution based on these applications:
When somebody wants to connect to Internet using my wifi, the first page he can see is the register/login page (whatever page he wants to visit).
After registration/login he is able to connect to Internet.

So let's see how I did it.

23 March, 2010

Using Grub2 and LUA installed on USB booting ISO images

I got 16 GB USB flash from my brother, because he can't see me still using my old 64 MB. He decided to buy Imation Nano-Flash-Drive.

Because of many of my friends and colleagues are using Win, I use NTFS on it. Old FAT is not "usable" in these days, because it can't handle bigger files.

From the first time I use USB disks I always want to have bootable disk/flash with live CDs - so here are few notes how to create USB flash drive able to boot stored live CDs:

RAID disk check in Linux

One day I checked dmesg from one of my servers and I saw I/O errors :-(
gate:~ dmesg
[ 4220.798665] ide: failed opcode was: unknown                                                    
[ 4220.798665] end_request: I/O error, dev hda, sector 21067462                                   
[ 4222.983683] hda: dma_intr: status=0x51 { DriveReady SeekComplete Error }
[ 4222.983683] hda: dma_intr: error=0x40 { UncorrectableError }, LBAsect=21067572, sector=21067470

Lucky for me there are two disks in RAID 1 so my data was not lost. The machine is "just" firewall, so I decided to play little bit with the bad hard disk, because there are no important data on it. Usually if you see errors like I mentioned above you replace disk without any questions, but I would like to "get" some outputs from diagnostic commands. So you can see what you can do in such case.

17 March, 2010

Perl Oracle client manual installation to home directory in Debian

I need to connect to the Oracle database in my work to get some data from it. I'm not the Oracle expert, but I decided to use DBD::Oracle.

Most of the manuals and how-to pages describe, how to install client libraries to system (usually as root), which was not my case.

I just need one directory with libraries in my $HOME and few scripts to get some data from the database - no system installations.

Here are the steps how to install DBD-Oracle and it's libraries to "one" directory without doing mess in the system: