Hi,
We've been having some internal discussions about the best way to handle
certain cases and I thought I'd turn to the list to solicit opinions on how
other people have solved this issue (or don't, as the case may be). The
issue is that we would like our modules to, where possible, check for the
existence of certain on disk data when installing a service for the first
time and retrieve it from somewhere if it's not available.
As an example of the kind of thing we're talking about we use a product
called Sonatype Nexus that relies on a bunch of on disk data in
/srv/sonatype-nexus/. When installing the system for the first time (for
example, when the file{} containing the .war triggers) we would like it to
automatically put down a copy of /srv/sonatype-nexus/. We obviously don't
want this drifting out of sync with the production data which is where the
issue is. How do other people handle this?
Our options seem to be:
* Nightly/hourly backups of production data to some location where Puppet
can rsync/wget/shovel it out when needed.
* Some kind of process that real-time syncs directories to nfs storage.
* Erroring if the data is missing in some fashion when Puppet runs and
relying on sysadmins to put it in place.
We've talked through the options but they all have fairly significant
drawbacks. My personal favorite solution would be some kind of daemon that
syncs data constantly and is capable of intelligently syncing the data back
to the node if it goes missing. It could be potentially error prone but it
represents the least bad choice. That combined with regular backups would
seem ideal but I can't find anything out there that does this without
significant work/investment. I debated just rsyncing every 15 minutes but
that's not great either.
Thanks,
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