254 lines
12 KiB
Bash
254 lines
12 KiB
Bash
#!/bin/bash
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# ==============================================================================================
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# ================================= Clear Logs =================================================
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# ==============================================================================================
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# Clears system and Docker container logs to prevent rootfs fill over time.
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# Runs weekly via WEEKLY_MAINTENANCE_SCRIPTS — Sunday 2:30am.
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# Uses size thresholds — only clears logs that have grown large enough to matter.
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#
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# ── WHAT IT CLEARS ────────────────────────────────────────────────────────────────────────────
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# System logs — LOG_FILES from master.conf (/var/log/syslog, messages, dmesg)
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# Cleared if size exceeds LOG_MIN_SIZE_MB
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# These grow continuously — weekly clearing keeps rootfs healthy
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#
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# Docker logs — /var/lib/docker/containers/**/*-json.log
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# Cleared only if individual container log exceeds LOG_DOCKER_MAX_MB
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# Active containers (Emby, SABnzbd) grow fastest — 100MB+ easily
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# Inactive containers not cleared — their logs are typically small
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#
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# ── SIZE THRESHOLD APPROACH ───────────────────────────────────────────────────────────────────
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# Truncating everything blindly destroys useful diagnostic context.
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# A 2MB log is not worth clearing — it contains useful recent history.
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# A 500MB log is consuming rootfs and contains mostly noise — clear it.
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#
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# LOG_MIN_SIZE_MB — system logs under this size are left alone
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# LOG_DOCKER_MAX_MB — Docker logs under this size are left alone
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#
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# ── WHY NOT LOGROTATE ─────────────────────────────────────────────────────────────────────────
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# unRAID writes to tmpfs (/var/log) — logrotate's compress + archive approach
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# would consume even more tmpfs space. Truncation (: > file) keeps the file
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# descriptor open and valid while emptying content — safe for running services.
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#
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# ── SAFEGUARDS ────────────────────────────────────────────────────────────────────────────────
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# acquire_lock — prevents concurrent runs corrupting logs
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# Root check — truncating system logs requires root
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# Size thresholds — only clears logs that have grown large enough
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# Byte tracking — reports MB freed for weekly digest
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# validate_unraid — notify validated before use
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# Silent on clean — small logs = nothing to clear = no output ✅
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#
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# ── CONFIGURATION (master.conf) ───────────────────────────────────────────────────────────────
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# LOG_FILES — system log paths to check and clear
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# LOG_MIN_SIZE_MB — minimum system log size before clearing (default 10MB)
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# LOG_DOCKER_MAX_MB — clear Docker log only if above this size (default 100MB)
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#
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# ── USAGE ─────────────────────────────────────────────────────────────────────────────────────
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# clear_logs.sh — normal run (threshold-based clearing)
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# clear_logs.sh --dry-run — show what would be cleared and sizes
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# clear_logs.sh --status — show current log sizes
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# clear_logs.sh --log — verbose output per file
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# ==============================================================================================
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SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
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source "$SCRIPT_DIR/../load_config.sh"
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parse_args "$@"
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# ==============================================================================================
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# ━━━ Setup ━━━
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# ==============================================================================================
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if [[ "$EUID" -ne 0 ]]; then
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error "Must be run as root — truncating system logs requires root"
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exit 1
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fi
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validate_unraid_cmd \
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"/usr/local/emhttp/plugins/dynamix/scripts/notify" \
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"" "" \
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"unRAID notify script" || warn "unRAID notify script not found — native notifications disabled"
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acquire_lock
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detect_hosts
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[[ "$DRY_RUN" == true ]] && warn "DRY RUN — no files will be cleared"
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# ==============================================================================================
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# ━━━ Status ━━━
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# ==============================================================================================
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if [[ "$SHOW_STATUS" == true ]]; then
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echo ""
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echo "━━━━━ $ICON_SUMMARY LOG STATUS ━━━━━"
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echo "$ICON_HOST Identity: $MY_ID ($LOCAL_SERVER_NAME)"
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echo "$ICON_GEAR Min system log: ${LOG_MIN_SIZE_MB:-10}MB before clearing"
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echo "$ICON_GEAR Max Docker log: ${LOG_DOCKER_MAX_MB:-100}MB before clearing"
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echo ""
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echo "━━━ System Logs ━━━"
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for f in "${LOG_FILES[@]}"; do
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if [[ -f "$f" ]]; then
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size=$(du -sh "$f" 2>/dev/null | cut -f1)
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size_mb=$(du -sm "$f" 2>/dev/null | cut -f1)
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threshold="${LOG_MIN_SIZE_MB:-10}"
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if [[ "${size_mb:-0}" -ge "$threshold" ]]; then
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echo " $ICON_WARN $f — $size (above ${threshold}MB threshold — would clear)"
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else
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echo " $ICON_SUCCESS $f — $size (under threshold)"
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fi
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else
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echo " $ICON_SKIP $f — not found"
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fi
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done
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echo ""
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echo "━━━ Docker Logs (top 10 by size) ━━━"
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if [[ -d /var/lib/docker/containers ]]; then
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find /var/lib/docker/containers/ -name "*-json.log" 2>/dev/null | \
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while IFS= read -r logfile; do
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size_mb=$(du -sm "$logfile" 2>/dev/null | cut -f1)
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container_id=$(basename "$(dirname "$logfile")" | cut -c1-12)
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container_name=$(docker inspect --format '{{.Name}}' "$container_id" \
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2>/dev/null | tr -d '/' || echo "$container_id")
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echo "${size_mb:-0} $container_name $logfile"
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done | sort -rn | head -10 | \
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while read -r size_mb name logfile; do
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threshold="${LOG_DOCKER_MAX_MB:-100}"
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if [[ "$size_mb" -ge "$threshold" ]]; then
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echo " $ICON_WARN ${size_mb}MB — $name (above ${threshold}MB — would clear)"
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else
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echo " $ICON_SUCCESS ${size_mb}MB — $name"
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fi
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done
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else
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echo " Docker directory not found"
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fi
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echo "━━━━━━━━━━━━━━━━━━━━━━━"
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exit 0
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fi
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# ==============================================================================================
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# ━━━ Clear Logs ━━━
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# ==============================================================================================
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START=$(date +%s)
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SYS_CLEARED=0
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SYS_SKIPPED=0
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SYS_BYTES=0
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DOCKER_CLEARED=0
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DOCKER_SKIPPED=0
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DOCKER_BYTES=0
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FAILED=()
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# ── System Logs ───────────────────────────────────────────────────────────────────────────────
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for logfile in "${LOG_FILES[@]}"; do
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if [[ ! -f "$logfile" ]]; then
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log "$logfile — not found, skipping"
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continue
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fi
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size_bytes=$(stat -c%s "$logfile" 2>/dev/null || echo 0)
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size_mb=$(( size_bytes / 1048576 ))
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size_h=$(du -sh "$logfile" 2>/dev/null | cut -f1)
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threshold="${LOG_MIN_SIZE_MB:-10}"
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if [[ "$size_mb" -lt "$threshold" ]]; then
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log "$logfile — ${size_h} (under ${threshold}MB — skipping)"
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(( SYS_SKIPPED++ ))
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continue
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fi
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if [[ "$DRY_RUN" == true ]]; then
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warn "DRY RUN — would clear: $logfile (${size_h})"
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(( SYS_CLEARED++ ))
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SYS_BYTES=$(( SYS_BYTES + size_bytes ))
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continue
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fi
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if : > "$logfile" 2>/dev/null; then
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log "Cleared: $logfile (freed ${size_h})"
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(( SYS_CLEARED++ ))
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SYS_BYTES=$(( SYS_BYTES + size_bytes ))
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else
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error "Failed to clear: $logfile"
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FAILED+=("$logfile")
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fi
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done
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# ── Docker Logs ───────────────────────────────────────────────────────────────────────────────
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if [[ ! -d /var/lib/docker/containers ]]; then
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log "Docker containers directory not found — skipping Docker log clear"
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else
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while IFS= read -r logfile; do
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[[ -z "$logfile" ]] && continue
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size_bytes=$(stat -c%s "$logfile" 2>/dev/null || echo 0)
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size_mb=$(( size_bytes / 1048576 ))
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size_h=$(du -sh "$logfile" 2>/dev/null | cut -f1)
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threshold="${LOG_DOCKER_MAX_MB:-100}"
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# Get container name for display
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container_id=$(basename "$(dirname "$logfile")" | cut -c1-12)
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container_name=$(docker inspect --format '{{.Name}}' "$container_id" \
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2>/dev/null | tr -d '/' || echo "$container_id")
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if [[ "$size_mb" -lt "$threshold" ]]; then
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log "Docker $container_name — ${size_h} (under ${threshold}MB — skipping)"
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(( DOCKER_SKIPPED++ ))
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continue
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fi
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if [[ "$DRY_RUN" == true ]]; then
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warn "DRY RUN — would clear Docker log: $container_name (${size_h})"
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(( DOCKER_CLEARED++ ))
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DOCKER_BYTES=$(( DOCKER_BYTES + size_bytes ))
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continue
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fi
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if : > "$logfile" 2>/dev/null; then
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log "Cleared Docker log: $container_name (freed ${size_h})"
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(( DOCKER_CLEARED++ ))
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DOCKER_BYTES=$(( DOCKER_BYTES + size_bytes ))
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else
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error "Failed to clear Docker log: $container_name"
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FAILED+=("docker:$container_name")
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fi
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done < <(find /var/lib/docker/containers/ -name "*-json.log" 2>/dev/null)
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fi
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END=$(date +%s)
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TOTAL_BYTES=$(( SYS_BYTES + DOCKER_BYTES ))
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TOTAL_FREED_H=$(awk "BEGIN {printf \"%.1fMB\", $TOTAL_BYTES / 1048576}")
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TOTAL_CLEARED=$(( SYS_CLEARED + DOCKER_CLEARED ))
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# ==============================================================================================
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# ━━━ Summary ━━━
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# ==============================================================================================
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if [[ "$TOTAL_CLEARED" -gt 0 || ${#FAILED[@]} -gt 0 ]]; then
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echo ""
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echo "━━━━━ $ICON_SUMMARY LOG CLEANER SUMMARY ━━━━━"
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echo "$ICON_HOST Identity: $MY_ID ($LOCAL_SERVER_NAME)"
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echo "$ICON_HEALTH System cleared: $SYS_CLEARED file(s)"
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echo "$ICON_CONTAINERS Docker cleared: $DOCKER_CLEARED file(s)"
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echo "$ICON_HEALTH Total freed: $TOTAL_FREED_H"
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echo "$ICON_TIME Duration: $(format_duration $(( END - START )))"
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[[ "$SYS_SKIPPED" -gt 0 || "$DOCKER_SKIPPED" -gt 0 ]] && \
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log "Skipped: ${SYS_SKIPPED} system + ${DOCKER_SKIPPED} Docker (under threshold)"
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echo ""
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if [[ "$DRY_RUN" == true ]]; then
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warn "DRY RUN — no files cleared"
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elif [[ ${#FAILED[@]} -gt 0 ]]; then
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echo "$ICON_ERROR Status: SOME FILES FAILED — ${FAILED[*]}"
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notify "Log clear failed on $(hostname) ($MY_ID) — ${FAILED[*]}" \
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"Clear Logs" "warning"
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else
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log "$ICON_DONE Status: done — ${TOTAL_FREED_H} freed"
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fi
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echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
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else
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# All logs under threshold — completely silent
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log "All logs under threshold — nothing to clear"
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fi
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[[ ${#FAILED[@]} -gt 0 ]] && exit 1
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exit 0 |