Log Rotation Script

bash Copy Code

#!/bin/bash
# Log Rotation Script with compression and retention
set -euo pipefail

LOG_DIR="${1:-/var/log/myapp}"
MAX_SIZE_MB="${2:-50}"
KEEP_DAYS="${3:-30}"
COMPRESS="${4:-true}"

log() { echo "[$(date '+%Y-%m-%d %H:%M:%S')] $1"; }

log "=== Log Rotation: $LOG_DIR ==="
log "Max size: ${MAX_SIZE_MB}MB | Retain: ${KEEP_DAYS} days | Compress: $COMPRESS"

# Find log files exceeding max size
MAX_SIZE_BYTES=$((MAX_SIZE_MB * 1024 * 1024))

find "$LOG_DIR" -name "*.log" -type f | while read -r logfile; do
    FILE_SIZE=$(stat -f%z "$logfile" 2>/dev/null || stat -c%s "$logfile" 2>/dev/null)

    if [ "$FILE_SIZE" -gt "$MAX_SIZE_BYTES" ]; then
        ROTATED="${logfile}.$(date +%Y%m%d_%H%M%S)"
        cp "$logfile" "$ROTATED"
        truncate -s 0 "$logfile"
        log "Rotated: $(basename $logfile) ($(numfmt --to=iec $FILE_SIZE))"

        if [ "$COMPRESS" = "true" ]; then
            gzip "$ROTATED"
            log "Compressed: $(basename $ROTATED).gz"
        fi
    fi
done

# Remove old rotated logs
OLD_COUNT=$(find "$LOG_DIR" \( -name "*.log.*.gz" -o -name "*.log.[0-9]*" \) -mtime +$KEEP_DAYS | wc -l)
if [ "$OLD_COUNT" -gt 0 ]; then
    find "$LOG_DIR" \( -name "*.log.*.gz" -o -name "*.log.[0-9]*" \) -mtime +$KEEP_DAYS -delete
    log "Removed $OLD_COUNT old log files"
fi

# Summary
TOTAL_SIZE=$(du -sh "$LOG_DIR" | cut -f1)
FILE_COUNT=$(find "$LOG_DIR" -type f | wc -l)
log "Directory: $TOTAL_SIZE total, $FILE_COUNT files"
log "=== Rotation complete ==="

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