Automate Log File Rotation and Compression

#!/bin/bash

# Configuration
LOG_DIR="/var/log/nginx" # Directory containing log files
LOG_FILE_PATTERN="access.log" # Pattern for log files to rotate (e.g., '*.log', 'access.log')
RETENTION_DAYS=30 # Number of days to keep compressed logs

echo "Starting log rotation and compression in $LOG_DIR"

# Find log files matching the pattern and rotate/compress them
find $LOG_DIR -maxdepth 1 -type f -name "$LOG_FILE_PATTERN" ! -name "*.gz" | while read LOG_FILE; do
    if [ -f "$LOG_FILE" ]; then
        TIMESTAMP=$(date +%Y%m%d_%H%M%S)
        NEW_LOG_FILE="${LOG_FILE%.log}.${TIMESTAMP}.log"
        COMPRESSED_LOG_FILE="${NEW_LOG_FILE}.gz"

        echo "Rotating and compressing $LOG_FILE to $COMPRESSED_LOG_FILE"
        mv "$LOG_FILE" "$NEW_LOG_FILE" || { echo "Error: Failed to move $LOG_FILE"; continue; }
        gzip "$NEW_LOG_FILE" || { echo "Error: Failed to compress $NEW_LOG_FILE"; continue; }

        # Optional: create a new empty log file for the application to write to
        # touch "$LOG_FILE" || { echo "Error: Failed to create new log file $LOG_FILE"; }
        # Note: For many services like Nginx, a 'logrotate' configuration handles this more robustly.
    fi
done

# Clean up old compressed logs
echo "Cleaning up old compressed logs (older than $RETENTION_DAYS days)..."
find $LOG_DIR -type f -name "${LOG_FILE_PATTERN}*.gz" -mtime +$RETENTION_DAYS -delete
echo "Log rotation and cleanup complete."