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diff --git a/debian/README.Debian b/debian/README.Debian
index 7513ac293a30b96e62e8dbafaadbcaead0cec2a6..cab3f6438cc1b39149199b0bf1a0062bbd592502 100644 (file)
--- a/debian/README.Debian
+++ b/debian/README.Debian
with collectd. See /usr/share/doc/collectd/examples/collection3/README for
details. This is a successor for collection.cgi.
with collectd. See /usr/share/doc/collectd/examples/collection3/README for
details. This is a successor for collection.cgi.
+Cleanup of old data:
+--------------------
+
+collectd itself does not take care of removing any data files (e.g. RRDtool)
+that are no longer updated (e.g., no longer existing hosts or instances).
+There are a couple of ways to take care of that. In any case, double-check the
+list of files to be removed before doing so! We do not take responsibility for
+any data loss or similar.
+
+- Check the last modification time of all RRD files:
+
+ find /var/lib/collectd/rrd/ -mtime +30 -type f
+
+ This will list all files that have not been updated within the last 30 days.
+ After double-checking the list of files, use a command like the following to
+ delete old files:
+
+ find /var/lib/collectd/rrd/ -mtime +30 -type f | xargs rm
+
+ NOTE: Some versions of RRDtool did not update mtime when writing to a file.
+ This has been fixed in version 1.3.5 of RRDtool. If your version is
+ affected by that, this approach does not work.
+
+- Check the 'last_update' header of the RRD files:
+
+ export IFS="
+ "
+ for file in $( find /var/lib/collectd/rrd/ -type f -name '*.rrd' ); do
+ last_update=$( rrdtool info $file | grep last_update | cut -d' ' -f3 )
+ if test -n "$last_update" \
+ -a $(( $( date +%s ) - $last_update )) -gt 2592000; then
+ echo $file
+ fi
+ done
+
+ This will also list all files that have not been updated within the last 30
+ days. It's a bit more expensive since each and every RRD file will have to
+ be read from disk rather than checking the file-system meta-data only.
+
+When doing those checks, take into account any caching times configured in the
+RRDtool plugin or when using RRDCacheD.
+
Building your own plugins:
--------------------------
- Originally, plugins for collectd had to be written in C and linked as shared
objects. Starting with version 4.0.0, it is also possible to use plugins
written in the scripting language Perl or implemented as separate processes.
Building your own plugins:
--------------------------
- Originally, plugins for collectd had to be written in C and linked as shared
objects. Starting with version 4.0.0, it is also possible to use plugins
written in the scripting language Perl or implemented as separate processes.
- See collectd-perl(5) and collectd-exec(5) for details.
+ In later versions, support for Java and Python has been added. See the
+ appropriate collectd-<extension>(5) manual page for details.
- If you want to contribute plugins to the official distribution you should
read http://collectd.org/dev-info.shtml.
- If you want to contribute plugins to the official distribution you should
read http://collectd.org/dev-info.shtml.