eraseredis.sh - small script to erase redis without making it unresponsive and causing failover

gistfile1.sh

#!/bin/bash
CNT=10
SLEEP=10
function show_help {
  echo "Usage: $0 -a auth_token -h host [-c count_per_iteration] [-s sleep_after_iteration]"
}

while getopts "h:c:s:a:?" opt; do
    case "$opt" in
    \?)
        show_help
        exit 0
        ;;
    h)  HOST=$OPTARG
        ;;
    c)  CNT=$OPTARG
        ;;
    s)  SLEEP=$OPTARG
        ;;
    a)  AUTH=$OPTARG
        ;;
    esac
done
if [ "zzz$HOST" == "zzz" ] || [ "zzz$AUTH" == "zzz" ]
then
  show_help
  exit 1
fi

echo "Erasing host $HOST, $CNT keys per iteration with $SLEEP second pauses"


REDIS_CMD="redis-cli -h $HOST -a $AUTH"

remaining=`$REDIS_CMD DBSIZE`
#prev_remaining=$remaining
while [[ "$remaining" != "$prev_remaining" ]]; do
  echo "keys remaining... $remaining"
  $REDIS_CMD scan 0 count $CNT | tail -n +2 | xargs -n 100 -d "\n" $REDIS_CMD DEL > /dev/null
  prev_remaining=$remaining
  remaining=`$REDIS_CMD DBSIZE`
  if [[ "$remaining" != "$prev_remaining" ]]; then echo "...";sleep $SLEEP; fi
done
echo "finished. keys remaining: $remaining"