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PDF 转换后端,我为什么选 Docker 而不是直接装环境

PDF 转换后端,我为什么选 Docker 而不是直接装环境
BACKEND · Docker实战2026.08

后端直接装环境就行?

PDF转换后端为什么选Docker

环境可控才是关键

个人开发者 · 小程序 · 后端部署

IT李工造工具箱:从0到1

4/8实战

📦 5 Parts + Conclusion

👉 滑动

PART 01

请求链路

ARCHITECTURE

PART 02

为什么Docker

WHY

PART 03

安全防护

SECURITY

PART 04

文件护栏

GUARDRAIL

PART 05

部署验证

DEPLOY

PART ///

写在最后

NEXT

Docker没法让故障消失,它只是让部署和回滚更可控

小程序页面能展示出来以后,我很快碰到了一个现实问题:PDF转Word、Word转PDF、合并拆分,到底在哪里执行

图片水印、颜色取色这类轻量操作,可以尽量留在手机本地。可Office转换涉及LibreOffice,PDF转Word也需要专门的解析库。把所有能力硬塞进小程序端,并不现实。

所以我给项目加了一套后端服务

这套后端跑在腾讯云轻量应用服务器上,Docker也不是我手动敲命令装的,是用1Panel服务器面板自带的容器功能管理的。对不熟悉命令行的人来说,有个可视化面板点几下就能创建容器,门槛低很多。

01

PART

当前请求链路

ARCHITECTURE · 架构梳理

用户在小程序里选择文件,通过HTTPS访问接口。服务器上装了1Panel面板,OpenResty接收请求后,反向代理到本机的Docker容器,容器里运行着FastAPI和转换工具。

链路可以简化成:

TEXT

微信小程序

 ↓ HTTPS

OpenResty / WAF

 ↓ 反向代理

Docker 容器

 ↓

FastAPI + LibreOffice + PDF/图片处理库

对外只开放反向代理入口,应用端口不直接暴露到公网。

02

PART

为什么放进Docker

WHY · 环境可控

我选 Docker,看中的就是环境可控

这里说的Docker,就是1Panel面板里那个“容器”功能,不是什么高深的黑科技。1Panel装好后Docker环境默认就带了,创建容器、看日志、重启都能在网页上操作,不用记命令。

PDF和Office转换不只是一个Python文件。它依赖系统字体、LibreOffice、Python包和临时目录。直接在服务器系统里安装,短期也能跑,但以后升级或迁移,很容易遇到版本差异

放进容器后,应用和依赖一起管理。需要回滚时,可以切回旧镜像;要迁移服务器时,也不用重新猜当初装过哪些组件。

对个人项目来说,这套做法比硬套微服务架构实用得多。

03

PART

后端没有网页,也不能裸奔

SECURITY · 缩小暴露面

这个域名没有面向用户的Web首页,只给小程序提供接口。但“没有前端”不代表别人访问不到

只要地址泄露,扫描器、爬虫和恶意请求照样能来。

我没给整个站点加网页密码,因为那样连小程序请求也会被拦住。更合适的做法是缩小暴露面

1

根路径不展示接口说明,返回404或简单状态

2

禁止目录列表和敏感文件访问

3

只开放小程序需要的API与下载短码

4

应用端口仅监听本机

5

加WAF、频率限制和请求日志

6

robots.txt只能减少正常搜索收录,不能当安全措施

!安全提醒 🕳

生产域名、IP和完整路径不应该出现在公开文章或截图中。下面示例统一使用虚构地址。

NGINX

location /api/ {

  proxy_pass http://127.0.0.1:8000;

  proxy_set_header Host $host;

  proxy_set_header X-Real-IP $remote_addr;

  proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

  proxy_set_header X-Forwarded-Proto $scheme;

}

!踩坑提示 🕳

配置能不能直接拿来用,要结合1Panel生成的站点结构和实际包含文件来检查,不能把文章片段整段覆盖到生产环境。

04

PART

文件处理增加了哪些护栏

GUARDRAIL · 硬限制

这类服务最怕两件事:大文件拖垮内存临时文件堆满磁盘。所以我给后端设了几条硬限制:

1

单个上传文件最大50MB

2

校验扩展名和允许的文件类型

3

PDF合并最多20个文件

4

LibreOffice转换最长180秒

5

下载使用短码映射,避免用户拼接服务器路径

6

上传文件与结果在15分钟后自动清理

这些数字不是越大越好。个人服务器资源有限,明确边界反而能保证大多数正常任务可用。

05

PART

覆盖部署前,我坚持做三件事

DEPLOY · 上线验证

升级后端时,我不会把新文件一覆盖就完事

我的操作顺序是:备份旧版本核对依赖变化,再用健康检查和真实文件验证。健康接口返回正常,只说明进程还活着;PDF转Word、合并拆分和图片转换仍要各跑一遍。

Docker没法让故障消失,真正兜底的是限制、日志和回归测试

///

LAST

写在最后

NEXT · 下篇预告

下一篇讲一次很典型的排障:后端明明正常,用户却一直看到“服务器响应异常”。最后的问题不在代码,而在WAF白名单

我是 IT李工,17年IT运维出身,正在从0到1造一个PDF工具箱小程序。

既然看到这里了,如果觉得有用,随手点个赞、在看、转发三连吧。

点赞
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THANKS FOR READING

基本 文件 流程 错误 SQL 调试
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  2. 运行时间 : 0.269424s [ 吞吐率:3.71req/s ] 内存消耗:4,489.20kb 文件加载:145
  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=ac8b575ebead528b5455acba6150bca3
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  1. CONNECT:[ UseTime:0.000987s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001478s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000649s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000618s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001371s ]
  6. SELECT * FROM `set` [ RunTime:0.000533s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001739s ]
  8. SELECT * FROM `article` WHERE `id` = 928704 LIMIT 1 [ RunTime:0.001032s ]
  9. UPDATE `article` SET `lasttime` = 1786851364 WHERE `id` = 928704 [ RunTime:0.045811s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.005034s ]
  11. SELECT * FROM `article` WHERE `id` < 928704 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.005275s ]
  12. SELECT * FROM `article` WHERE `id` > 928704 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.015498s ]
  13. SELECT * FROM `article` WHERE `id` < 928704 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001859s ]
  14. SELECT * FROM `article` WHERE `id` < 928704 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002942s ]
  15. SELECT * FROM `article` WHERE `id` < 928704 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002969s ]
0.273383s