Linux Developers and Users Conference 2009 in Brno

1 July, 2009 (13:17) | 18 comments

Red Hat Czech announced an open conference in Brno for all open source developers and users (yeah, sysadmins are also users). The list of presentations and workshops is growing and I already found some interested topics I’m looking forward to attend. Bookmark the link to its wiki page, more information will follow shortly.

https://fedoraproject.org/wiki/DeveloperConference2009

Red Hat Czech Open House

7 April, 2009 (20:04) | No comments

Red Hat Czech invites you to Open House event in Brno. Come and see how enterprise open source software is build – be a part of it! :)

How to disable USB Disk STANDBY mode

3 March, 2009 (21:06) | 19 comments

Recently I bought an external USB Disk Seagate FreeAgent XTreme, but after some idle time, it spanned down. Take me a while to find out how to disable this standby mode. First install sdparm.
If you want to start the drive in standby:
sdparm –command=start /dev/sdb
To clean standby mode flag:
sdparm –clear STANDBY -6 /dev/sdb && sdparm -a [...]

How to fix wrong dns serial number?

6 January, 2009 (16:57) | 2 comments

Did it ever happen to you by mistake to add one additional digit into dns serial number? Ooops! Now, how to fix it?

Increase the serial number to (2^31) – (correct serial number) and reload named. For example 2^31-2009010602 = 138473046. As DNS serial numbers are signed integers, this make server thinks that it’s a negative [...]

The open road: Red Hat “deeply undervalued,” Oracle Linux “has failed”

5 December, 2008 (10:56) | 2 comments

I find Matt Asay’s new article about Mark Murphy’s analyzes on Oracle enterprise linux very interesting, quoting part of the article.

Oracle has failed in its attempt to enter the Linux market. Our recent survey of Oracle database customers reveals that only 1 out of 32 customers currently uses Oracle Unbreakable Linux. This one customer also [...]

Linux distros’ homepage uptime

20 November, 2008 (11:44) | 1 comment

Interesting report from pingdom about uptime of Linux ditros’ homepage (but also Apple and Microsoft). I’m more than happy to see Fedora and Red Hat taking leading positions in this benchmark.

Multiple host names in a single kerberos key tab

19 November, 2008 (14:33) | 1 comment

If you are using clustered service with kerberos, you may want to merge hostnames keytab files to one for simple distribution.

Create host and service principals.

kadmin: addprinc -randkey host/node1.corp.intranet.lan
kadmin: addprinc -randkey host/node2.corp.intranet.lan
kadmin: addprinc -randkey host/node3.corp.intranet.lan
kadmin: addprinc -randkey host/node4.corp.intranet.lan
kadmin: addprinc -randkey host/node5.corp.intranet.lan
kadmin: addprinc -randkey host/node6.corp.intranet.lan
kadmin: addprinc -randkey host/node7.corp.intranet.lan
kadmin: addprinc [...]