Redis Cluster backup script

redis-cluster-backup.sh

#!/bin/sh

readonly cluster_topology=$(redis-cli -h redis-cluster cluster nodes)
readonly slaves=$(echo "${cluster_topology}" | grep slave | cut -d' ' -f2,4 | tr ' ' ',')

readonly backup_dir="/opt/redis-backup"
mkdir -p ${backup_dir}

for slave in ${slaves}; do
    master_id=$(echo "${slave}" | cut -d',' -f2)
    slave_ip=$(echo "${slave}" | cut -d':' -f1)
    slots=$(echo "${cluster_topology}" | grep "${master_id}" | grep "master" | cut -d' ' -f9)

    if [ -z "$slave_ip" ] || [ -z "$slots" ]; then
        echo "Can not find redis slave or slots in topology:\n${cluster_topology}\n" 
        exit 1
    fi

    # Get last dump.rdb
    redis-cli --rdb dump.rdb -h ${slave_ip}

    # Check rdb file for consistency
    rdb_check=$(redis-check-rdb dump.rdb)
    echo ${rdb_check} | grep "Checksum OK" | grep "RDB looks OK!"

    # If rdb is consistent, compress it and move to backup directory. Fail otherwise.
    if [ $? -eq 0 ]; then
        backup_file=dump-${slots}-$(date '+%Y-%m-%d-%H%M').rdb.gz
        gzip dump.rdb
        mv dump.rdb.gz ${backup_dir}/${backup_file}
    else
        failed_dump=dump-failed-${slots}-$(date '+%Y-%m-%d-%H%M').rdb
        echo "RDB check failed!"
        mv dump.rdb ${backup_dir}/${failed_dump}
    fi
done

# Cleanup backups older than 5 days
find ${backup_dir} -mindepth 1 -mtime +5 -delete

In redis 5.0.8 versions, an error is reported here：
slots=$(echo "${cluster_topology}" | grep "${master_id}" | grep "master" | cut -d' ' -f9)

what kind of error?

Great Script , Do you have a script for restoration?

Thanks @gee456. I don't have a restoration script. When I need to restore something, I check what slots were affected, pick the file with the corresponding slots, upload it to the affected server and follow the standard recovery procedure.