Why nobody should use the uceprotect DNSBL

2007-11-14 stintel  2 minute read

Geez... Today one of the mail servers I'm maintaining seems to be blacklisted in the uceprotect blacklist. I had never heard of them until now. And I must say, the guys at uceprotect really think they are the Gods of mail or something. If you want to get yourself removed from this list, you either have to wait 7 days - given that your server's IP address doesn't connect to their trap again. Or, you could pay these sons of bitches 50€ (per IP!!!) to get unlisted immediately. This is totally unacceptable, who the hell do they think they are???

Dell + booting from USB devices

2007-07-10  2 minute read

Recently I needed to boot a Dell server (PE1950) from a USB flash drive. The flash drive contained a bootable image from the CentOS 5 DVD (images/diskboot.img), to run the CentOS installer, and kickstart the machine over the network. When cold booting these machines (eg. from a power down state), there is no problem at all. I simply hit F11 to enter the boot menu, choose the Front USB flash drive that shows up in the menu, and the machine starts booting - no problem here.

Netconsole

2007-12-24 stintel  1 minute read

Ever tried setting up netconsole under Linux, but never received anything from the kernel log on the machine configured as target in the netconsole module? Check the kernel.printk setting in sysctl.

On Linux, there is a global and per-user limit of open file descriptors (read: maximum number of open files). The global limit is distribution and kernel specific, the per-user limit is set to 1024 by default. However, some applications, like Lotus Domino, Oracle, ... require to have more than 1024 open files.

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