d66f0d65c3
- backup/Dockerfile: Alpine 3.21 + postgresql-client + dcron - backup/backup.sh: pg_dump -> MD5-Checksum-Vergleich (skip bei unveränderter DB) -> gzip-komprimiertes Backup mit Timestamp -> Rotation: älteste .sql.gz löschen bis Gesamtgröße < 1 GB - docker-compose.yml: neuer Service 'backup', Volume 'backup_data' - Cronjob: täglich 03:00 UTC
57 lines
1.7 KiB
Bash
57 lines
1.7 KiB
Bash
#!/bin/sh
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set -e
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BACKUP_DIR="${BACKUP_DIR:-/backups}"
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DB_HOST="${POSTGRES_HOST:-db}"
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DB_NAME="${POSTGRES_DB:-krisenvorrat}"
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DB_USER="${POSTGRES_USER:-krisenvorrat}"
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MAX_SIZE_BYTES=$((1 * 1024 * 1024 * 1024)) # 1 GB
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mkdir -p "$BACKUP_DIR"
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TIMESTAMP=$(date -u +"%Y-%m-%d_%H%M")
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BACKUP_FILE="${BACKUP_DIR}/${DB_NAME}_${TIMESTAMP}.sql.gz"
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CHECKSUM_FILE="${BACKUP_DIR}/.last_checksum"
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echo "[$(date -u)] Starting backup of database '${DB_NAME}' on host '${DB_HOST}'..."
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# Dump to temp file for checksum comparison
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TEMP_DUMP=$(mktemp)
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export PGPASSWORD="${POSTGRES_PASSWORD:-}"
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pg_dump -h "$DB_HOST" -U "$DB_USER" "$DB_NAME" > "$TEMP_DUMP"
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# Compute MD5 of dump content to detect changes
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CURRENT_CHECKSUM=$(md5sum "$TEMP_DUMP" | cut -d' ' -f1)
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LAST_CHECKSUM=""
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if [ -f "$CHECKSUM_FILE" ]; then
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LAST_CHECKSUM=$(cat "$CHECKSUM_FILE")
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fi
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if [ "$CURRENT_CHECKSUM" = "$LAST_CHECKSUM" ]; then
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echo "[$(date -u)] No changes since last backup. Skipping."
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rm -f "$TEMP_DUMP"
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exit 0
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fi
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# Compress and save
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gzip -c "$TEMP_DUMP" > "$BACKUP_FILE"
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rm -f "$TEMP_DUMP"
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printf '%s' "$CURRENT_CHECKSUM" > "$CHECKSUM_FILE"
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echo "[$(date -u)] Backup saved: ${BACKUP_FILE}"
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# Rotate: remove oldest .sql.gz until total backup dir size <= 1 GB
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while true; do
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TOTAL=$(du -sb "$BACKUP_DIR" | cut -f1)
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if [ "$TOTAL" -le "$MAX_SIZE_BYTES" ]; then
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break
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fi
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OLDEST=$(ls -tr "${BACKUP_DIR}"/*.sql.gz 2>/dev/null | head -1)
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if [ -z "$OLDEST" ]; then
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echo "[$(date -u)] Warning: Cannot reduce backup dir below 1 GB, no more files to delete."
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break
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fi
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echo "[$(date -u)] Rotation: removing ${OLDEST} (dir total: ${TOTAL} bytes)"
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rm -f "$OLDEST"
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done
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echo "[$(date -u)] Backup complete."
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