2010/1/21 Tim Cutts <t...@sanger.ac.uk> > > On 21 Jan 2010, at 9:00 am, Erlend Leganger wrote: > > I have played with cfengine for a while and set up an environment with >> about >> 20 client machines.One day /var/cfengine/inputs was empty on one of these >> machines. I don't know why and it was easy to fix, but I wasn't warned >> about >> it - I came across it by accident. So, how many of my cfengine-activated >> clients do really run cfengine? I ended up visiting all of them and found >> a >> few more with problems - such a brute force method doesn't scale well. >> >> How do you monitor this? Maybe activate a policy from time to time to send >> an email to you? Analyse the log files to verify that all clients check in >> every hour (my clients are on an hourly cf-execd)? Use other tools such as >> ganglia/nagios/icinga? Any best practice here? >> > > On my cfengine2 setup, I run a cron job on the policy server, which looks > at the directory containing lastseen databases. There should be a lastseen > database in there for each host that cfengine has ever seen. The script > looks for any of these which haven't called in for more than 24 hours. It > looks them up in DNS - if they don't exist in DNS, it assumes it's an old > machine that has been decommissioned, and removes the lastseen database for > it. Otherwise, it reports to me in a mail which machines have not reported > in to cfengine in the last 24 hours. Something like this one, from last > night: > > Hmm, in my cfengine v3.0.2 setup, /var/cfengine/lastseen is empty. There is a /var/cfengine/cf_LastSeen.db which probably contains the same info for cf3, but that is not readily accessible to me - maybe I can crank up Perl to look into cf_LastSeen.db - but then again, I have no idea of the schema for the data in there. Any tips out there on how to access cf_LastSeen.db or is this a dead end?
- Erlend
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