check-miner-sync2.sh

#!/bin/bash

if [ "$1" = "-h" ] || [ -z "$1" ]; then
    echo "Usage: pass miner's IP address to this script"
    echo "or pass -h for this message :)"
exit 0
fi

if [ -z ${1+x} ]; then
    MINER_IP_USE="$MINER_IP"
else
    MINER_IP_USE="$1"
fi

MINER_STATUS=$(curl -s "$MINER_IP_USE"/status.json)
MINER_STATUS_RESULT="$?"
if [ "$MINER_STATUS_RESULT" -gt 0 ]; then
    echo "could not communicate with miner using command: curl -s "$MINER_IP_USE"/status.json"
    echo are you sure your miner is at this address?
    exit 1
fi
MINER_HEIGHT=$(echo "$MINER_STATUS" | python3 -c "import sys, json; print(json.load(sys.stdin)['miner_height'])")
PYTHON3_RESULT="$?"
if [ "$PYTHON3_RESULT" -gt 0 ]; then
    echo could not parse json using command: "echo "$MINER_STATUS" | python3 -c \"import sys, json; print(json.load(sys.stdin)['miner_height'])\" "
    echo are you sure you have python3 installed?
    exit 1
fi

LATEST_SNAPSHOT=$(curl -s https://us915.s3.amazonaws.com/assets/snaps/snapshot.json)
SNAPSHOT_RESULT="$?"
if [ "$SNAPSHOT_RESULT" -gt 0 ]; then
    echo "could not retrieve snapshot height using command : curl -s https://us915.s3.amazonaws.com/assets/snaps/snapshot.json"
    exit 1
fi
SNAPSHOT_HEIGHT=$(echo "$LATEST_SNAPSHOT" | python3 -c "import sys, json; print(json.load(sys.stdin)['height'])")

echo "Miner height: "$MINER_HEIGHT""
echo "Snapshot height: "$SNAPSHOT_HEIGHT""

if [ $MINER_HEIGHT -lt $SNAPSHOT_HEIGHT ]; then
    echo "Miner height ("$MINER_HEIGHT") below snapshot height ("$SNAPSHOT_HEIGHT"). Miner has lost sync."
    echo Issuing fast sync command
    curl -i -H "Authorization:Basic Ym9iY2F0Om1pbmVy" --request POST http://"$MINER_IP_USE"/admin/fastsync
else
    echo Miner at "$MINER_IP_USE" is synced
fi

save file, name it something like check-miner-sync2.sh
make it executable
chmod +x check-miner-sync2.sh
then run:
crontab -e
and add something like
0,30 * * * * /usr/bin/systemd-cat -t "miner-sync-script" /home/clintar/check-miner-sync2.sh 192.168.7.223
of course changing the path and replacing 192.168.7.223 with your miner's local IP
this will check every half hour if your miner is out of sync below the latest snapshot and run a fast sync on it automatically if so
you can run:
journalctl -u cron.service
to watch what happened when it ran