If you manage a few dozen servers or more, maintain a couple of applications or even websites, you owe it yourself to use some kind of Version Control Systems. Something like CVS, SVN or maybe even Git. Alternatively, you can use something like cfEngine to keep all servers configured similarly. However, CVS or SVN can store working versions of all important in one place and provide you will roll-backs if worse comes to worst. Application servers create little config files like crazy and getting a release frozen into SVN, using a subversion tag, can be a life saver at times.
I've been playing a bit with the nscd now and want to share some tips related to tuning the nscd.conf file. To see how the DNS cache is doing, use nscd -g. nscd configuration: 0 server debug level 26m 57s server runtime 5 current number of threads 32 maximum number of threads 0 number of times clients had to wait yes paranoia mode enabled 3600 restart internal passwd cache: no cache is enabled [other zero output removed] group cache: no cache is enabled [other zero output removed] hosts cache: yes cache is enabled yes cache is persistent yes cache is shared 211 suggested size 216064 total data pool size 1144 used data pool size 3600 seconds time to live for positive entries 20 seconds time to live for negative entries 66254 cache hi...
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