灾难恢复和备份

灾难恢复确保系统在灾难发生时能够快速恢复。

📋 备份策略

备份策略设计：

🎯 备份实现示例

#!/bin/bash
# MySQL备份脚本示例

# 配置
DB_HOST="localhost"
DB_USER="root"
DB_PASSWORD="password"
DB_NAME="mydb"
BACKUP_DIR="/backup/mysql"
RETENTION_DAYS=7

# 全量备份
backup_full() {
    DATE=$(date +%Y%m%d_%H%M%S)
    BACKUP_FILE="$BACKUP_DIR/full_backup_$DATE.sql"
    
    mysqldump -h $DB_HOST -u $DB_USER -p$DB_PASSWORD \
        --single-transaction \
        --routines \
        --triggers \
        $DB_NAME > $BACKUP_FILE
    
    # 压缩备份文件
    gzip $BACKUP_FILE
    
    echo "Full backup completed: $BACKUP_FILE.gz"
}

# 增量备份（基于binlog）
backup_incremental() {
    DATE=$(date +%Y%m%d_%H%M%S)
    BACKUP_FILE="$BACKUP_DIR/incremental_backup_$DATE.sql"
    
    # 刷新日志
    mysql -h $DB_HOST -u $DB_USER -p$DB_PASSWORD \
        -e "FLUSH LOGS;"
    
    # 备份binlog
    mysqlbinlog --read-from-remote-server \
        --host=$DB_HOST \
        --user=$DB_USER \
        --password=$DB_PASSWORD \
        --raw \
        --result-file=$BACKUP_FILE \
        mysql-bin.*
    
    gzip $BACKUP_FILE
    echo "Incremental backup completed: $BACKUP_FILE.gz"
}

# 清理旧备份
cleanup_old_backups() {
    find $BACKUP_DIR -name "*.sql.gz" -mtime +$RETENTION_DAYS -delete
    echo "Old backups cleaned up"
}

# 主流程
main() {
    backup_full
    cleanup_old_backups
}

main

🎯 容灾方案

多机房部署架构：

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