Archive for January, 2011

RHEL 5.6 is released

Wednesday, January 12th, 2011

Today Red Hat has released RHEL5.6 after a beta period of ~2 months. There is no official announcement (yet), so the release highlights are unknown. Probably they are the same like the beta version.

Have fun!

Epson scanners on Linux systems

Tuesday, January 11th, 2011

I’ve got a Epson Perfection 1260 Photo scanner.

Fedora like other distributions such as OpenSuse are recognizing the device since a long long time. The back end chosen for the device is plustek.

Unfortunately when using the default configuration one experience very strange effects with colours. The left and the right 50% of the picture have a colored background, even when scanning a empty page.

I had this problem with OpenSUSE since years and still got it with Fedora 1x. Since I only need the scanner for my yearly income tax declaration, I always forget about what I needed to change.

That’s what is needed to change:

Solution

[root@bond ~]# diff /etc/sane.d/plustek.conf.orig /etc/sane.d/plustek.conf
100c100
< option altCalibration 0
---
> option altCalibration 1
[root@bond ~]# 

Since I do not have any other scanners I do not know if this is a bug specifically to this type of scanners, or if it is a general bug.

Using different search engines, the web does not disclose some solutions. That is one of the reasons why I’m blogging about it. The other reason is to find other people with the same problem.

At the end of the day, I’ll try to find out if this is a general bug of the Sane back end, or just specific to some Epson scanners. If it is specific to some Epson scanners, it may be worth to create a new specific back end for those scanners affected.

Having fun? Now I have, my stuff is successfully scanned.

Spice and RHEV, a RHCE goes MCSE

Tuesday, January 11th, 2011

I’m currently working in a project which includes some virtual Linux desktops. The desktop of choice is RHEL6.

How to bring a Linux desktop via WAN to a thin client? VNC -> are you nuts? Remote X11 over SSH -> WAN = no go. NX -> another vendor involved. SPICE -> Spicy! But: Spice over WAN? To be tested…

SPICE is the protocol used by RHEV (Red Hat Enterprise Virtualization). Some time ago I had the chance to test this stuff @Red Hat in Munich. The experience was nice, it is comparable to vSphere, but it only works with MS Internet explorer due to ActiveX and .Net stuff.

The management software needs to be installed on a Windows 2008R2 server. The database to be used is – you guess it – MS SQL. Users are authenticated either by Active Directory (Not generic LDAP!) or local Windows Users. Holy cow!

At first, when I got this product presented by Red Hat I was LOL. Now, it seems that I need to refresh my Windows knowledge because it seems to be the only product capable to provide enterprise ready Linux desktop virtualization. I’m crying :-(

At least the hypervisor used is not MS HyperV, it is KVM based on RHEL5, to replaced with RHEL6 in the future.

There is some light at the end of the tunnel: Red Hat is working on a replacement of the Windows-bound stuff. It will be replaced with some JBOSS and Java stuff. The database will probably be PostgreSQL. It will take some time to develop it before it will be ready for production.

Since Red Hat is opensourcing all (or most) of its products, it would be great to get in touch with the upstream project (release early, release often).

In meantime I need to build up knowledge about Windows Server 2008R2, Active Directory, MS SQL Server and DotNet.

Having fun?