Backing up ZFS snapshots
Posted by jpluimers on 2018/12/06
An interesting idea at [WayBack] I was getting concerned about a backup, which had exceeded 1GB, when the data was only about 400MB. Once the job finished, I realized: Ahh, ZFS compres… – Dan Langille – Google+:
Here’s that script I use for creating/destroy the snaphots for a particular long dataset name. Then I backup from /mnt
[WayBack] gist.github.com/dlangille/480dbca509562eb03e76c2e1b576c6d2 is in sh, not even bash.
–jeroen
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| #!/bin/sh | |
| ACTION=$1 | |
| BASENAME="/usr/bin/basename" | |
| MOUNT="/sbin/mount" | |
| UMOUNT="/sbin/umount" | |
| ZFS="/sbin/zfs" | |
| DATASETROOT="main_tank/data/freshports/backend/queues" | |
| DATASETS="${ZFS} list -r -H -o name ${DATASETROOT}" | |
| SNAPSHOTDIRECTORY='/.zfs/snapshot/' | |
| SNAPNAME="bu" | |
| TMP_MNT_POINT="/mnt/freshports-queues" | |
| case ${ACTION} in | |
| "create") | |
| ${ZFS} snapshot -r "${DATASETROOT}@${SNAPNAME}" | |
| for dataset in `${DATASETS}` | |
| do | |
| echo mkdir -p ${TMP_MNT_POINT}/${dataset} | |
| mkdir -p ${TMP_MNT_POINT}/${dataset} | |
| done | |
| for dataset in `${DATASETS}` | |
| do | |
| if [ ${dataset} != ${DATASETROOT} ] | |
| then | |
| echo ${MOUNT} -t zfs -o ro ${dataset}@${SNAPNAME} ${TMP_MNT_POINT}/${dataset} | |
| ${MOUNT} -t zfs -o ro ${dataset}@${SNAPNAME} ${TMP_MNT_POINT}/${dataset} | |
| fi | |
| done | |
| ;; | |
| "destroy") | |
| for dataset in `${DATASETS}` | |
| do | |
| # Ignore the jail root. Nothing in there to backup. | |
| if [ "${dataset}" = "${DATASETROOT}" ] | |
| then | |
| continue | |
| fi | |
| echo ${UMOUNT} ${TMP_MNT_POINT}/${dataset} | |
| done | |
| ${ZFS} destroy -r "${DATASETROOT}@${SNAPNAME}" | |
| ;; | |
| esac |
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