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Upgrading to 2.0================Upgrading from the Munin 1.4 series to 2.0 should be quite easy.But there are some things to take note of if you want a very smoothtransition.The most important change is the CGI requirement. * Munin graphs are now generated on-demand by the web server, and the "munin-graph" execution has been removed from the munin-cron script. Its use is now mostly for debugging purposes. * Munin html pages may be generated on-demand by the web server. The default is still to run "munin-html" from cron after every update.If you install from SVN or tar ball please make sure you read theINSTALL file VERY carefuly. If you install from a packaged (DEB, RPM, ...) version, please make sure you read the specific INSTALL file VERY carefuly, as there might be some particularities.From Munin 1.4-------------------------Based on comparisons of test Munin installations on Linuxwe see identical rrd file names, and rrd files are created andstructured the same way as before. This ensures that your datahistory is preserved. Upgrading to 2.0 should therefore prove to bestraightforward and cause no data loss. BUT, as hard as we tried, there might be a few exceptions, so YMMV.In terms of ordering I would upgrade the master first. If you do notuse a packaging system you may have to look around for old .pm filesand purge them to get 2.0 work propperly. Do NOT purge the RRDfiles or the configuration.After the master is upgraded upgrade the nodes one by one. Please seenotes about changes in plugin and data-field names in the sectionsbelow before you start upgrading the nodes.And as one said in IRC, an old munin proverb is : "Wait two munin fetch rounds before you can expect to see results."It is specially true when upgrading as the config files should auto-updatethemselves, but it might take up to 2 iteration of munin-cron to be reallysorted out.From Munin 1.2----------------If you still have munin-nodes running 1.2, there is no need to rush as polling1.2 nodes from a 2.0 master is well supported.Upgrade master straight from 1.2 isn't supported, but should work mostly wellas 2.0 is highly 1.4-compatible. But be sure to read UPGRADING-1.4 to look atspecific issues from 1.2.Rollback----------Thanks to the highly 1.4-compatible status of 2.0, and our PnP-way of doingthings, rollbacking the install is very easy : just reinstall 1.4 and removeall the *.storable files from /var/lib/munin. But don't touch the .rrd as theyARE your history.Then wait again for 2 munin-cron runs, and the rollback should be complete.