Day 9/90: Directory Backup with Rotation in Shell Scripting 🔄 #90DaysOfDevOps

Day 9: Directory Backup with Rotation 🚀

Hello DevOps enthusiasts! 👋 Welcome to Day 9 of the #90DaysOfDevOps challenge. Today, we're building a backup system with rotation functionality.

Backup Script Solution 💻

#!/bin/bash

# Check if directory argument is provided
if [ $# -ne 1 ]; then
    echo "Usage: $0 <directory_path>"
    exit 1
fi

# Variables
source_dir="$1"
timestamp=$(date +%Y-%m-%d_%H-%M-%S)
backup_dir="${source_dir}/backup_${timestamp}"

# Check if source directory exists
if [ ! -d "$source_dir" ]; then
    echo "Error: Source directory does not exist"
    exit 1
fi

# Create backup
echo "Creating backup in $backup_dir"
mkdir -p "$backup_dir"
cp -r "${source_dir}/"* "$backup_dir" 2>/dev/null

# Implement rotation (keep only last 3 backups)
cd "$source_dir"
ls -d backup_* 2>/dev/null | sort | head -n -3 | xargs rm -rf 2>/dev/null

echo "Backup completed. Current backups:"
ls -d backup_* 2>/dev/null

Script Features 🔧

1. Input Validation

   • Checks for correct usage
   • Verifies directory existence

2. Backup Creation

   • Timestamped backups
   • Complete directory copying
   • Error handling

3. Rotation Mechanism

   • Maintains last 3 backups
   • Automatically removes old backups
   • Sorted by timestamp

4. Status Reports

   • Clear error messages
   • Completion confirmation
   • Lists current backups

Usage Examples 📝

# Create backup
./backup_with_rotation.sh /home/user/documents

# Expected Output:
# Creating backup in /home/user/documents/backup_2024-10-24_14-30-00
# Backup completed. Current backups:
# backup_2024-10-24_12-00-00
# backup_2024-10-24_13-00-00
# backup_2024-10-24_14-30-00

Key Takeaways 💡

• Automated backups ensure data safety
• Rotation prevents disk space issues
• Timestamps enable version tracking
• Error handling is crucial

Bash #DevOps #Automation #Linux #90DaysOfDevOps

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This is Day 9 of my #90DaysOfDevOps journey. Keep backing up and rotating!