I'm managing Linux servers for my team. For each new instance, I install the following softwares:
- etckeeper which keeps tracks of every changes in /etc
- shorewall to have a simple setup for firewall
- rsnapshot which keep incremental backup of important directories
- cron-apt takes charge of update of the system (or, in my case, send me an email to warn me about new updates)
But I was wondering if you administrators have any other wonderful tools for daily management. I'm not talking about remote group management (like cfengine) but little tools which help to manage a small number of Linux servers.