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Editorial Team
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Asked: 2026-05-13T10:59:10+00:00

Given a log file with clear check-in and check-out messages per user, how can

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Given a log file with clear check-in and check-out messages per user, how can I feed this data into RRDtool to track the total users logged in to the site? (At this time, I do not care about unique users, but that would be nice too of course!)

I read about the DERIVE data source type. How do I get a hypothetical INTEGRAL type instead? Can this be done straightforwardly?

Of course, I could process the file myself, updating GAUGE into the RRD and saving state somehow.; however, I am hoping to avoid that if I can get away with it.

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  1. Editorial Team

    since rrdtool deals in ‘rates’ it can not really count as you would like it to. The best you could get would be to use an ABSOLUTE type data-source, but this would only work for creating something like a login/logout rate statistic … you could answer how many logins and how many logouts per-hour you had …

    You would then do an rrdtool update login.rrd N:1 whenever you have a login.

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