Still using debian etch?
When you need install some package to old discontinued debian, you will get
Error 404 Not FoundSolution is change /etc/apt/sources.list
deb http://archive.debian.org/debian/ etch main non-free contribSource http://linuxsysadminblog.com/2010/07/debian-ftp-archive-for-etch-archive-debian-org/
Checking forward and reverse dns
Very often problems like 'my website is not working' or 'I did not get any emails' are caused by improperly set up dns records or expired domain. At my work, I'm permanently dealing with incorrectly set up dns records. There are available services like intodns.com which you can use to check dns records for domain. But what to do, if you have problem with reverse dns? Or you want to check, if your reverse delegation is set up correctly?
Hardware raid in debian
To manage and monitor hardware raid, you need proper utility. Most of vendors provides raid utilities only for Redhat based linuxes. For Debian based distribution I have found very useful repository - http://hwraid.le-vert.net/wiki/DebianPackages. You just need to know, which raid card you are using and follow provided instructions.
Apache authentication against active directory
I have found nice howto about apache and Active directory authentication
http://www.netexpertise.eu/en/apache/authentication-against-active-directory.html
Tweak the readahead of a raid in linux
If your dealing with big RAID arrays with a linux 2.6 kernel you will need to tweak your block device readahead settings. This can double or triple your read speeds. The tweak is very easy.
Blocking SIP brute force attacks with fail2ban
SIP brute force attacks against Asterisk servers are very popular. Best way to defend is to block sip by default and allow only allowed IPs to connect. But we can not use this approach in some cases. Here fail2ban can help.
Remove todays debian installed packages
When you change your mind or you have installed packages on wrong server this magic command can help:
Running Trixbox in Xen
A week ago I was searching if we can run multiple Trixboxes on one physical server.
Zabbix 1.8 for Ubuntu 9.10 Karmic
I have build backported zabbix 1.8 packages (agent and server) for Ubuntu Karmic. They can be downloaded here.
Control panels for webhosting
Last few days I have been searching for webhosting control panel. I want something what can manage email accounts, apache2, ftp and dns zones. And I also want to split services to few servers for higher availability, build cluster. Two web servers, two mail servers and all data on shared storage.