After successfully setting up the ZFS auto snapshot package, I was at the point of implementing its backup functionality when I saw the announcement of the removal of that, and the associated uproar. I looked deeper and discovered that the autosnap backup didn't really meet my needs after all, and couldn't find anything else out there that did, so I wrote my own script using the zfs send/receive functionality to replicate snapshots to another host.
It works as intended, but I'm sure it could be improved. Something I know would be a good change would be converting it to an SMF service, and replacing the lockfile bit with SMF maintenance state, but I don't know SMF manifests that well, so hopefully someone can contribute one! I also know the error handling could be abstracted out and improved somewhat. I check for the failure cases I can think of and drop to maintenance in case any of those happen. Description/rationale of the script (more detailed comments within the script): # This supplements zfs-auto-snapshot, but runs independently. I prefer that # snapshots continue to be taken even if the backup fails. # # This aims to be much more robust than the backup functionality of # zfs-auto-snapshot, namely: # * it uses 'zfs send -I' to send all intermediate snapshots (including # any daily/weekly/etc.), and should still work even if it isn't run # every hour -- as long as the newest remote snapshot hasn't been # rotated out locally yet # * 'zfs recv -dF' on the destination host removes any snapshots not # present locally so you don't have to worry about manually removing # old snapshots there. I realize this doesn't meet everybody's needs but hopefully someone will find it useful. Note: I'm running sol10u8. I expect this to work fine on recent OpenSolaris also, but I have not tested that. The only change required to make zfs-auto-snapshot v0.12 work on sol10u8 was changing ksh93 to dtksh in the shebang line. Andrew Daugherity Systems Analyst Division of Research & Graduate Studies Texas A&M University
zfs-backup.sh
Description: Bourne shell script
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