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    <description>Linux 运维、TLS、DNS 与自动化的实践记录。每篇都是完整的一次操作过程。</description>
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      <title>用归档源救活一台 EOL 的 Debian 11</title>
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      <category>apt</category>
      <description>Debian 11 进入归档后 apt 全线 404。记录切到 archive.debian.org 的完整过程，以及 check-valid-until 这个容易踩的参数。</description>
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      <title>acme.sh 与 HTTP-01：把证书续期交给 cron</title>
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      <pubDate>Mon, 26 Oct 2026 20:30:00 +0800</pubDate>
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      <description>用 acme.sh 通过 HTTP-01 签发证书，配好自动续期与热加载，以及几个常见的失效原因。</description>
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      <title>Nginx 静态站的缓存与压缩取舍</title>
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      <title>DNS 令牌的最小权限</title>
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      <category>安全</category>
      <description>自动续期需要能改 DNS 的令牌。如何把权限收敛到单个区域，以及怎么验证它真的只有这么点权限。</description>
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      <description>小内存 VPS 跑 Nginx 的四个关键参数，以及为什么瓶颈通常不是内存本身。</description>
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      <title>systemd-timesyncd：时间不准会让证书提前失效</title>
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      <category>TLS</category>
      <description>证书本身没问题、浏览器却说不安全，很多时候只是系统时钟慢了几分钟。</description>
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