Hi everyone, I contacted the rrd-users list with this issue and Mr. Oetiker asked me to send it here.
I've started using rrdcached a week ago and everything is working just fine, however I'm having problems to produce updated graphs. Let me first describe my setup a little bit: - All my "rrd update" and "rrd graph" calls are using the parameter "-- daemon" to take advantage of rrdcached; - rrdcached is started with these parameters: rrdcached -F -t 16 -s nobody -m 0666 -l unix:/tmp/rrdcached.sock -w 900 -l 127.0.0.1:12345 - All my "rrd update" calls, write to files in their real location, while "rrd graph" reads the same RRD files in a different location (either because there's some symlink or null mount in the path). I have reviewed the "-b" option from rrdcached, and I understand symlinks are not allowed on the base directory, however the symlink in my case is not in the base directory. Additionally, I have replaced the symlink with a null mount and the problem persists. The problem I'm seeing, can be illustrated here: with symlink or null mount: FLUSH /usr/local/rrd/myproject/repository/local/switches/myswitch/ 10146.rrd 0 Nothing to flush: /usr/local/rrd/myproject/repository/local/switches/ myswitch/10146.rrd. real file location: Flush /usr/local/rrd/myproject/rrd/switches/myswitch/10146.rrd 0 Successfully flushed /usr/local/rrd/myproject/rrd/switches/myswitch/ 10146.rrd. Where: /usr/local/rrd/myproject/reporsitory/local is a symlink (or null mount) to /usr/local/rrd/myproject/rrd I have the impression "rrdcached" is storing the full path of the RRD files internally, and only accepts a FLUSH command if the path is exactly the same as used in "rrd_update". Can you please confirm if this is the correct behavior? If that's just how rrdcached works, I believe we should update the documentation to highlight the importance of using the exact same path from "rrd_update" when flushing. If that's not desirable, and rrdcached is meant to be able to handle different paths, then I believe there's something wrong with the software's logic somewhere in the code (sorry, I didn't really check the source code). I'm probably going to rewrite my application to use the same path both in rrd_update and rrd_graph, however I think it would be better if the path was not a problem for the flush command (i.e. if a flush command is received and there's a symlinkt in the path, the real location could be calculated in order to find the file that needs to be flushed). Thanks for your attention, Eduardo Bragatto. _______________________________________________ rrd-developers mailing list rrd-developers@lists.oetiker.ch https://lists.oetiker.ch/cgi-bin/listinfo/rrd-developers
