记录 AI、大模型应用与技术折腾的个人博客。https://blog.890714.xyz/en-ushttps://blog.890714.xyz/posts/commands/https://blog.890714.xyz/posts/commands/uptime; free -h; df -h # 系统状态Wed, 24 Jun 2026 04:00:00 GMT折腾技术https://blog.890714.xyz/posts/ssh-hardening/https://blog.890714.xyz/posts/ssh-hardening/公网 VPS 最常见入口是 root 密码爆破，第一件事就是关掉。Wed, 24 Jun 2026 04:00:00 GMT折腾技术https://blog.890714.xyz/posts/building-blog/https://blog.890714.xyz/posts/building-blog/整套跑在一台 VPS 上：**Hugo** 生成静态页（服务器零负载）、**Caddy** 反代+自动 HTTPS、域名一条 A 记录指过来。静态站没数据库没后端，没东西可被黑，还快——对小内存 VPS 尤其友好。Tue, 23 Jun 2026 04:00:00 GMT随笔随笔https://blog.890714.xyz/posts/systemd/https://blog.890714.xyz/posts/systemd/systemctl status/restart/enable --now <svc>Tue, 23 Jun 2026 04:00:00 GMT折腾技术https://blog.890714.xyz/posts/ai-llm-basics/https://blog.890714.xyz/posts/ai-llm-basics/从 Token、注意力机制到下一个词预测，用最少的数学讲清 LLM 的核心。Tue, 23 Jun 2026 00:00:00 GMTLLMTransformerAIhttps://blog.890714.xyz/posts/migration/https://blog.890714.xyz/posts/migration/旧机 960MB 内存换成了 **2GB 内存 / 30GB 盘** 的新机。一天之内重做：SSH 密钥加固、Shadowsocks（带 BBR 调优）、Caddy、Beszel 监控、这个博客。详见 [VPS 自托管](/docs/vps/) 章节。Mon, 22 Jun 2026 04:00:00 GMT随笔随笔https://blog.890714.xyz/posts/troubleshooting/https://blog.890714.xyz/posts/troubleshooting/核心是**逐层隔离**：Mon, 22 Jun 2026 04:00:00 GMT折腾技术https://blog.890714.xyz/posts/ai-prompt-engineering/https://blog.890714.xyz/posts/ai-prompt-engineering/不靠玄学，靠结构。让 LLM 输出更稳定、更准的实用提示词技巧。Mon, 22 Jun 2026 00:00:00 GMTPromptLLMAIhttps://blog.890714.xyz/posts/backup/https://blog.890714.xyz/posts/backup/RAID 只解决硬盘物理损坏，防不了：误删 `rm -rf`、勒索加密、误覆盖、整机被偷/失火。Sun, 21 Jun 2026 04:00:00 GMT折腾技术https://blog.890714.xyz/posts/why-selfhost/https://blog.890714.xyz/posts/why-selfhost/三个理由：数据归自己、完全可控、学到东西。代价是要自己管安全/备份/更新——但对喜欢折腾的人，这恰恰是乐趣。Sun, 21 Jun 2026 04:00:00 GMT随笔随笔https://blog.890714.xyz/posts/ai-rag-intro/https://blog.890714.xyz/posts/ai-rag-intro/检索增强生成的原理、流程，以及它为什么能治幻觉。Sun, 21 Jun 2026 00:00:00 GMTRAGLLM向量AIhttps://blog.890714.xyz/posts/intro/https://blog.890714.xyz/posts/intro/NAS（网络附加存储）就是一台常开、接在家庭网络里的专用存储设备，把容量通过网络共享给所有设备——相当于一个永远在线、容量超大、完全归自己的私人网盘。Sat, 20 Jun 2026 04:00:00 GMT折腾技术https://blog.890714.xyz/posts/ai-vector-db/https://blog.890714.xyz/posts/ai-vector-db/RAG 的存储底座怎么选,从够用到高性能的几个常见选项。Sat, 20 Jun 2026 00:00:00 GMT向量RAG数据库AIhttps://blog.890714.xyz/posts/performance/https://blog.890714.xyz/posts/performance/慢在哪要分层看：网络层、协议层、磁盘层。Fri, 19 Jun 2026 04:00:00 GMT折腾技术https://blog.890714.xyz/posts/ai-ollama-local/https://blog.890714.xyz/posts/ai-ollama-local/一行命令在自己机器上跑开源大模型,数据不出本地。Fri, 19 Jun 2026 00:00:00 GMTOllama本地部署LLMAIhttps://blog.890714.xyz/posts/raid-zfs/https://blog.890714.xyz/posts/raid-zfs/级别 | 最少盘 | 容错 | 可用容量 |Thu, 18 Jun 2026 04:00:00 GMT折腾技术https://blog.890714.xyz/posts/ai-finetune-vs-rag/https://blog.890714.xyz/posts/ai-finetune-vs-rag/想让大模型更懂你的领域?先搞清这三种方式的成本和适用场景。Thu, 18 Jun 2026 00:00:00 GMTLLMRAG微调AIhttps://blog.890714.xyz/posts/dali/https://blog.890714.xyz/posts/dali/大理**地理格局舒服：西苍山十九峰、东洱海，古城村落夹在坝子里。环洱海骑行到喜洲，白族民居配苍山，安静得不真实。下关风很大。Wed, 17 Jun 2026 04:00:00 GMT旅行游记https://blog.890714.xyz/posts/ai-agent/https://blog.890714.xyz/posts/ai-agent/让大模型不只是聊天,而是会查资料、调 API、执行多步任务。Wed, 17 Jun 2026 00:00:00 GMTAgentLLM工具调用AIhttps://blog.890714.xyz/posts/daocheng/https://blog.890714.xyz/posts/daocheng/清明从成都沿川藏南线西行。最迷人的是**地理的剧烈过渡**：一天内从四川盆地爬到横断山高原，植被从阔叶林变灌丛再变草甸。Tue, 16 Jun 2026 04:00:00 GMT旅行游记https://blog.890714.xyz/posts/ai-context-tokens/https://blog.890714.xyz/posts/ai-context-tokens/为什么长文档会被截断、为什么 API 按 token 计费、上下文塞满会怎样。Tue, 16 Jun 2026 00:00:00 GMTLLMToken上下文AIhttps://blog.890714.xyz/posts/xinjiang/https://blog.890714.xyz/posts/xinjiang/伊犁河谷是个**向西敞开的喇叭口**，接住大西洋暖湿气流，被天山挡住降雨，于是别处干旱这里水草丰美。Mon, 15 Jun 2026 04:00:00 GMT旅行游记https://blog.890714.xyz/posts/ai-multimodal/https://blog.890714.xyz/posts/ai-multimodal/从纯文本到图文混合,多模态大模型能干什么、怎么用。Mon, 15 Jun 2026 00:00:00 GMT多模态LLM视觉AIhttps://blog.890714.xyz/posts/beszel/https://blog.890714.xyz/posts/beszel/Go 写的轻量监控，hub + agent 都在本机，~20MB。hub 听 `127.0.0.1:8090` 由 Caddy 反代，agent 听 45876 仅本机。Sun, 14 Jun 2026 04:00:00 GMT折腾技术https://blog.890714.xyz/posts/ai-coding-assistant/https://blog.890714.xyz/posts/ai-coding-assistant/Claude Code / Copilot 这类工具,怎么用才能真正提效。Sun, 14 Jun 2026 00:00:00 GMTAI编程效率AIhttps://blog.890714.xyz/posts/caddy-https/https://blog.890714.xyz/posts/caddy-https/Caddy 是总入口，最大优点是**自动签发/续期 Let's Encrypt**：Sat, 13 Jun 2026 04:00:00 GMT折腾技术https://blog.890714.xyz/posts/firewall-tools/https://blog.890714.xyz/posts/firewall-tools/ufw 默认拒绝入站，只放行必要端口：Fri, 12 Jun 2026 04:00:00 GMT折腾技术https://blog.890714.xyz/posts/shadowsocks/https://blog.890714.xyz/posts/shadowsocks/`shadowsocks-libev` + AEAD 加密：Thu, 11 Jun 2026 04:00:00 GMT折腾技术