marco.locatelli@steamware.net
118 lines
3.8 KiB
Bash
118 lines
3.8 KiB
Bash
#!/bin/bash
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# Backup INCREMENTAL con atomicità, cleanup, log completi e sicurezza operativa
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# Sicuro per cluster Galera
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# Autore: Marco + Copilot
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set -euo pipefail
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# Aumenta i file descriptor disponibili
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ulimit -n 65536
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# Directory base dei backup
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BACKUP_BASE=/var/backups/tscale01
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# Prefissi per full e incremental
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FULL_PREFIX=backup-full-
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INC_PREFIX=backup-inc-
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# Timestamp per la directory del backup
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TIMESTAMP=$(date +%Y%m%d-%H%M%S)
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# Directory finale del backup INCREMENTAL
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TARGET="$BACKUP_BASE/${INC_PREFIX}${TIMESTAMP}"
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# File di log generale
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LOGFILE=/var/log/mariadb-backup.log
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# Lockfile per evitare esecuzioni concorrenti
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LOCKFILE=/var/lock/mariadb-backup.lock
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# Nome del server per i log
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SERVER_NAME=$(hostname -s)
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# Assicura che il logfile esista e abbia permessi sicuri
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touch "$LOGFILE"
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chown root:root "$LOGFILE"
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chmod 600 "$LOGFILE"
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(
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# FLOCK: evita che due backup partano insieme
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flock -n 9 || {
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echo "[$(date '+%F %T')] [$SERVER_NAME] SKIP: another backup is running" >> "$LOGFILE"
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exit 0
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}
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# Trova l'ultimo FULL disponibile
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LATEST_FULL=$(ls -1d ${BACKUP_BASE}/${FULL_PREFIX}* 2>/dev/null | sort | tail -n1 || true)
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if [ -z "$LATEST_FULL" ]; then
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echo "[$(date '+%F %T')] [$SERVER_NAME] ERROR: no FULL backup found. Create a FULL backup first." >> "$LOGFILE"
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exit 1
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fi
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BASE_DIR="$LATEST_FULL"
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# Crea directory del backup
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mkdir -p "$TARGET"
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chown mysql:mysql "$TARGET"
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chmod 750 "$TARGET"
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# File temporaneo per catturare errori del backup
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TMPLOG=$(mktemp /tmp/mariadb-backup-inc.XXXXXX)
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echo "---------------------" >> "$LOGFILE"
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echo "[$(date '+%F %T')] [$SERVER_NAME] START incremental backup $TARGET (base: $BASE_DIR)" >> "$LOGFILE"
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# Esecuzione backup INCREMENTAL
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if mariadb-backup \
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--defaults-file=/etc/mysql/backup.conf \
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--backup \
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--target-dir="$TARGET" \
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--incremental-basedir="$BASE_DIR" \
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--verbose >"$TMPLOG" 2>&1; then
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echo "[$(date '+%F %T')] [$SERVER_NAME] END incremental backup $TARGET" >> "$LOGFILE"
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# Misura dimensione apparente (byte logici)
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size_apparent_bytes=$(find "$TARGET" -type f -printf '%s\n' 2>/dev/null | awk '{s+=$1} END{print s+0}')
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size_apparent_human=$(numfmt --to=iec --suffix=B "$size_apparent_bytes" 2>/dev/null || echo "${size_apparent_bytes}B")
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# Misura spazio su disco effettivo (byte allocati)
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size_disk_bytes=$(du -s --block-size=1 "$TARGET" 2>/dev/null | cut -f1 || echo 0)
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size_disk_human=$(numfmt --to=iec --suffix=B "$size_disk_bytes" 2>/dev/null || echo "${size_disk_bytes}B")
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echo "[$(date '+%F %T')] [$SERVER_NAME] SIZE apparent: $size_apparent_human ($size_apparent_bytes bytes)" >> "$LOGFILE"
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echo "[$(date '+%F %T')] [$SERVER_NAME] SIZE on-disk: $size_disk_human ($size_disk_bytes bytes)" >> "$LOGFILE"
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echo "[$(date '+%F %T')] [$SERVER_NAME] RESULT: OK, no errors" >> "$LOGFILE"
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rm -f "$TMPLOG"
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else
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# Backup fallito → log + cleanup directory
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echo "[$(date '+%F %T')] [$SERVER_NAME] ERROR during incremental backup for $TARGET. See $TMPLOG" >> "$LOGFILE"
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tail -n 200 "$TMPLOG" >> "$LOGFILE"
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echo "[$(date '+%F %T')] [$SERVER_NAME] CLEANUP: removing incomplete incremental backup directory $TARGET" >> "$LOGFILE"
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rm -rf "$TARGET"
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rm -f "$TMPLOG"
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exit 1
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fi
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# Rotazione: mantieni esattamente 11 incrementali più recenti
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cd "$BACKUP_BASE" || exit 1
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TO_DELETE=$(ls -1d ${INC_PREFIX}* 2>/dev/null | sort | head -n -11 || true)
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if [ -n "$TO_DELETE" ]; then
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echo "[$(date '+%F %T')] [$SERVER_NAME] ROTATE: removing old incrementals:" >> "$LOGFILE"
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echo "$TO_DELETE" >> "$LOGFILE"
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echo "$TO_DELETE" | xargs -r -d '\n' rm -rf --
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else
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echo "[$(date '+%F %T')] [$SERVER_NAME] ROTATE: no incrementals to remove (<=11 present)" >> "$LOGFILE"
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fi
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echo " " >> "$LOGFILE"
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) 9>"$LOCKFILE"
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