55 lines
1.8 KiB
Bash
Executable File
55 lines
1.8 KiB
Bash
Executable File
#!/usr/bin/env bash
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set -euo pipefail
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BACKUP_DIR="${BACKUP_DIR:-./backups}"
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MYSQL_HOST="${MYSQL_HOST:-127.0.0.1}"
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MYSQL_PORT="${MYSQL_PORT:-3307}"
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MYSQL_USER="${MYSQL_USER:-ai_kb}"
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MYSQL_DATABASE="${MYSQL_DATABASE:-ai_knowledge_base_v2}"
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BACKUP_RETENTION_DAYS="${BACKUP_RETENTION_DAYS:-14}"
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: "${MYSQL_PASSWORD:?必须通过 MYSQL_PASSWORD 配置数据库密码}"
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command -v mysqldump >/dev/null || { echo "未找到 mysqldump" >&2; exit 1; }
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command -v gzip >/dev/null || { echo "未找到 gzip" >&2; exit 1; }
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if command -v sha256sum >/dev/null; then
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checksum_command=(sha256sum)
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elif command -v shasum >/dev/null; then
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checksum_command=(shasum -a 256)
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else
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echo "未找到 sha256sum 或 shasum" >&2
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exit 1
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fi
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mkdir -p "$BACKUP_DIR"
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timestamp="$(date +%Y%m%d_%H%M%S)"
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output_file="$BACKUP_DIR/${MYSQL_DATABASE}_${timestamp}.sql.gz"
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temporary_file="${output_file}.tmp"
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trap 'rm -f "$temporary_file"' EXIT
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MYSQL_PWD="$MYSQL_PASSWORD" mysqldump \
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--host="$MYSQL_HOST" \
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--port="$MYSQL_PORT" \
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--user="$MYSQL_USER" \
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--single-transaction \
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--quick \
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--no-tablespaces \
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--routines \
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--triggers \
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--events \
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--set-gtid-purged=OFF \
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--default-character-set=utf8mb4 \
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"$MYSQL_DATABASE" | gzip -9 > "$temporary_file"
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gzip -t "$temporary_file"
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test -s "$temporary_file"
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mv "$temporary_file" "$output_file"
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(cd "$(dirname "$output_file")" && "${checksum_command[@]}" "$(basename "$output_file")" > "$(basename "$output_file").sha256")
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if [[ "$BACKUP_RETENTION_DAYS" =~ ^[0-9]+$ ]] && (( BACKUP_RETENTION_DAYS > 0 )); then
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find "$BACKUP_DIR" -type f \( -name "${MYSQL_DATABASE}_*.sql.gz" -o -name "${MYSQL_DATABASE}_*.sql.gz.sha256" \) \
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-mtime "+$BACKUP_RETENTION_DAYS" -delete
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fi
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echo "备份完成：$output_file"
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echo "校验文件：${output_file}.sha256"
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