Re: security advice

[Robert Larsen <robert () the-playground dk>]

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Not knowing how you work makes your question hard to answer but a few
quick ones:
* Keep the system up to date (apt-get update && apt-get upgrade or similar)
* Install a host based intrusion detection system like Tripwire or AIDE
* Install a network based intrusion detection system like Snort
* Harden your installations with something like Bastille
* Run your system from a read-only filesystem and having only your mail
folders on writable media. Mount the writable media with noexec.
* Have lots of graphs showing the typical behaviour (load, memory usage,
network traffic, etc.) so that you can spot "weird" changes (rrdtool for
instance)
* Monitor your network services with something like Nagios (so that your
users won't have to tell you that something isn't right)
* Monitor your logs with something like logwatch

Just my 2 cents worth


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