Bash Scripts for Automatic DOS Attack Blocking and MySQL Database Backup

1. DOS attack prevention (automatic IP blocking)

#!/bin/bash DATE=$(date +%d/%b/%Y:%H:%M) LOG_FILE=/usr/local/nginx/logs/demo2.access.log ABNORMAL_IP=$(tail -n5000 $LOG_FILE |grep $DATE |awk '{a[$1]++}END{for(i in a)if(a[i]>10)print i}') for IP in $ABNORMAL_IP; do if [ $(iptables -vnL |grep -c "$IP") -eq 0 ]; then iptables -I INPUT -s $IP -j DROP echo "$(date +'%F_%T') $IP" >> /tmp/drop_ip.log fi done

2. MySQL database backup

#!/bin/bash DATE=$(date +%F_%H-%M-%S) HOST=localhost USER=backup PASS=123.com BACKUP_DIR=/data/db_backup DB_LIST=$(mysql -h$HOST -u$USER -p$PASS -s -e "show databases;" 2>/dev/null | egrep -v "Database|information_schema|mysql|performance_schema|sys") for DB in $DB_LIST; do BACKUP_NAME=$BACKUP_DIR/${DB}_${DATE}.sql if ! mysqldump -h$HOST -u$USER -p$PASS -B $DB > $BACKUP_NAME 2>/dev/null; then echo "$BACKUP_NAME backup failed!" fi done

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