forked from extern/zfs-auto-snapshot
Add check_missed_snapshots, support for '##' fs-name, update README
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Tim Foster
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@ -47,7 +47,7 @@ daily snapshots every day, keeping 31 snapshots
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weekly snapshots every week, keeping 7 snapshots
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monthly snapshots every month, keeping 12 snapshots
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The default service instance does not need to be enabled.
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The :default service instance does not need to be enabled.
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Additional instances of the service can also be created, for example to group
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related sets of filesystems under a single service instance.
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@ -55,17 +55,25 @@ related sets of filesystems under a single service instance.
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The properties each instance needs are:
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zfs/fs-name The name of the filesystem. If the special filesystem
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name "//" is used, then the system snapshots all
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name "//" is used, then the system snapshots only
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filesystems with the zfs user property
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"com.sun:auto-snapshot:<label>" set to true, so to take
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frequent snapshots of tank/timf, run the following zfs
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command:
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# zfs set com.sun:auto-snapshot:frequent=true tank/timf
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When the "snap-children" property is set to true,
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only locally-set filesystem properties are used to
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When the "snap-children" property is set to "true",
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only locally-set dataset properties are used to
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determine which filesystems to snapshot -
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property inheritance is not respected.
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property inheritance is not respected in this case,
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but yeilds better performance for large dataset trees.
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The special filesystem name "##" is the reverse of the
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above - it snapshots all filesystems, except ones that are
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explicitly marked with a "com.sun:auto-snapshot:<label>"
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set to "false". Using this zfs/fs-name value implicitly
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turns off the "snap-children" flag.
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zfs/interval [ hours | days | months | none]
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When set to none, we don't take automatic snapshots, but
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@ -73,9 +81,15 @@ The properties each instance needs are:
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fire the method script whenever they want - useful for
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snapshotting on system events.
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zfs/keep How many snapshots to retain. "all" keeps all snapshots.
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zfs/keep How many snapshots to retain - eg. setting this to "4"
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would keep only the four most recent snapshots. When each
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new snapshot is taken, the oldest is destroyed. If a snapshot
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has been cloned, the service will drop to maintenance mode
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when attempting to destroy that snapshot. Setting to "all"
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keeps all snapshots.
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zfs/period How often you want to take snapshots
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zfs/period How often you want to take snapshots, in intervals
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set according to "zfs/interval"
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(eg. every 10 days)
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zfs/snapshot-children "true" if you would like to recursively take snapshots
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@ -90,7 +104,13 @@ The properties each instance needs are:
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a backup is running.
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zfs/label A label that can be used to differentiate this set of
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backups from others, not required.
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snapshots from others, not required. If multiple
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schedules are running on the same machine, using distinct
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labels for each schedule is needed - otherwise one
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schedule could remove snapshots taken by another schedule
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according to it's snapshot-retention policy.
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(see "zfs/keep")
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zfs/verbose Set to false by default, setting to true makes the
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service produce more output about what it's doing.
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@ -112,7 +112,7 @@ done
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function schedule_snapshots {
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typeset FMRI=$1
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zfs_smf_props $1
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zfs_smf_props $FMRI
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# FIXME need work in here to actually validate the FMRI props
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typeset FILESYS="$fs_name"
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typeset INTERVAL="$interval"
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@ -143,6 +143,7 @@ function schedule_snapshots {
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# remove anything that's there at the moment
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unschedule_snapshots $FMRI
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check_missed_snapshots $INTERVAL $PERIOD $FMRI
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add_cron_job $INTERVAL $PERIOD $OFFSET $FMRI
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@ -282,6 +283,86 @@ function unschedule_snapshots {
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}
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# This function is intended to be called on service start. It checks to see
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# if the last snapshot was taken more than <frequency> <intervals> ago,
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# and if that's the case, takes a snapshot immediatedly.
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function check_missed_snapshots { # $INTERVAL $PERIOD $FMRI
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set -x
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typeset INTERVAL=$1
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typeset PERIOD=$2
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typeset FMRI=$3
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typeset FILESYS=$fs_name
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typeset LABEL=$label
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case "$FILESYS" in
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"//")
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FILESYS=$(get_snapshot_datasets $LABEL $SNAP_CHILDREN)
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;;
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"##")
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FILESYS=$(get_nonexcluded_datasets $LABEL)
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;;
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esac
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if [ "$LABEL" != "\"\"" ] ; then
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LABEL="${SEP}${LABEL}"
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else
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LABEL=""
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fi
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# check to see if there are any filesystems
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if [ -z "$FILESYS" ] ; then
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return 0
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fi
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# only interested in the first filesystem, assuming they
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# all have a similar creation date.
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set -A fs $FILESYS
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LAST_SNAPSHOT=$(zfs list -H -o name -r -t snapshot ${fs[0]} \
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| grep "${fs[0]}@${PREFIX}${LABEL}" | tail -1)
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# if we've never taken a snapshot, do nothing
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if [ -z "$LAST_SNAPSHOT" ] ; then
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return 0
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fi
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LAST_SNAP_TIME=$(zfs get -H -p -o value creation $LAST_SNAPSHOT)
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LAST_SNAP_TIME_HUMAN=$(zfs get -H -o value creation $LAST_SNAPSHOT)
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NOW=$(perl -e 'print time;')
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# slightly incorrect time accounting here, but good enough.
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MINUTE_S=60
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HOUR_S=$(( $MINUTE_S * 60 ))
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DAY_S=$(( $HOUR_S * 24 ))
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MONTH_S=$(( $DAY_S * 30 ))
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case $INTERVAL in
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"minutes")
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MULTIPLIER=$MINUTE_S
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;;
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"hours")
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MULTIPLIER=$HOUR_S
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;;
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"days")
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MULTIPLIER=$DAY_S
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;;
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"none")
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return 0
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;;
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"*")
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print_log "WARNING - unknown interval encountered in check_missed_snapshots!"
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return 1
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esac
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PERIOD_S=$(( $MULTIPLIER * $PERIOD ))
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AGO=$(( $NOW - $LAST_SNAP_TIME ))
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if [ $AGO -gt $PERIOD_S ] ; then
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print_log "Last snapshot for $FMRI taken on $LAST_SNAP_TIME_HUMAN"
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print_log "which was greater than the $PERIOD $INTERVAL schedule. Taking snapshot now."
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take_snapshot $FMRI
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fi
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}
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# This function actually takes the snapshot of the filesystem.
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# $1 is assumed to be a valid FMRI
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function take_snapshot {
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@ -291,7 +372,7 @@ function take_snapshot {
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export LOG=$log
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typeset DATE=$(date +%F-%H${SEP}%M${SEP}%S)
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typeset FILESYS=$fs_name
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typeset FILESYS="$fs_name"
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typeset KEEP=$keep
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typeset SNAP_CHILDREN=$snapshot_children
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@ -312,11 +393,23 @@ function take_snapshot {
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# user property which specifies which datasets should be snapshotted
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# and under which "label" - a set of default service instances that
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# snapshot at defined periods (daily, weekly, monthly, every 15 mins)
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if [ "$FILESYS" == "//" ] ; then
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# the "##" filesystem is also special. It takes snapshots of
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# all datasets (non-recursively) *except* those marked with the tag
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# "com.sun:auto-snapshot:${LABEL}" = false. We necessarily ignore
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# the SNAP_CHILDREN setting in this case, as that could result in
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# us inadvertently taking snapshots of a child dataset under the
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# parent's lack of "com.sun:auto-snapshot:${LABEL}" = false tag.
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case "$FILESYS" in
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"//")
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FILESYS=$(get_snapshot_datasets $LABEL $SNAP_CHILDREN)
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else
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FILESYS=$FILESYS
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fi
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;;
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"##")
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FILESYS=$(get_nonexcluded_datasets $LABEL)
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SNAP_CHILDREN=false
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;;
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esac
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if [ "$LABEL" != "\"\"" ] ; then
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LABEL="${SEP}${LABEL}"
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@ -617,16 +710,29 @@ function get_snapshot_datasets { #LABEL #SNAP_CHILDREN
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typeset LABEL=$1
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typeset SNAP_CHILDREN=$2
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if [ "${SNAP_CHILDREN}" = "true" ] ; then
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typeset FS=$(zfs get com.sun:auto-snapshot:$LABEL \
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| grep local | grep true | awk '{print $1}')
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typeset FS=$(zfs get -s local -o name,value com.sun:auto-snapshot:$LABEL \
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| grep true$ | awk '{print $1}')
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else
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typeset FS=$(zfs list -t filesystem,volume \
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-o name,com.sun:auto-snapshot:$LABEL \
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| grep true | awk '{print $1}')
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| grep true$ | awk '{print $1}')
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fi
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echo "$FS"
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}
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# Get a list of filesystems we should snapshot. We look for all filesystems
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# and volumes that don't have a property com.sun:auto-snapshot:$LABEL
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# set to false.
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function get_nonexcluded_datasets {
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typeset LABEL=$1
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typeset FS=$(zfs list -H -t filesystem,volume \
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-o name,com.sun:auto-snapshot:$LABEL \
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| grep -v false$ | awk '{print $1}')
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echo "$FS"
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}
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# Determine if a pool is currently being scrubbed or resilvered.
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# Return 0 if it is scrubbing/resilvering, 1 otherwise.
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@ -671,7 +777,7 @@ function is_scrubbing { # POOL SCRUBLIST
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# consult to in order to actually take the snapshot.
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if [ -n "${SMF_FMRI}" ] ; then
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zfs_smf_props $SMF_FRI
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zfs_smf_props $SMF_FMRI
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export LOG=${log}
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fi
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