docs(rollback): 灾备段补 rollback-dryrun 四要素预检——Halo 退役后开关即空枪,dryrun 可一眼识别
验证: 独立复核(@worker-one)确认三级恢复描述与 rollback.sh 行为一致 Spec: 2026-11-05_blog-5n-admin-deep-optimization Co-authored-by: GLM-5.3
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## 灾备开关(仅主理人)
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`infra/deploy/rollback.sh` 是**整站切换**:把 nginx 从静态站切回旧 Halo(127.0.0.1:18090),秒级生效。这是静态站全面故障时的逃生通道,日常内容问题永远用不上它。预演:`bash infra/deploy/rollback.sh`(默认 dry-run);执行需 root + `--exec`。
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`infra/deploy/rollback.sh` 是**整站切换**:把 nginx 从静态站切回旧 Halo(127.0.0.1:18090),秒级生效。这是静态站全面故障时的逃生通道,日常内容问题永远用不上它。预演:`bash infra/deploy/rollback.sh`(默认 dry-run);执行前建议先 `bash infra/deploy/rollback-dryrun.sh` 看四要素——Halo 容器若已退役,这个开关就是空枪,dryrun 一眼能看出来;执行需 root + `--exec`。
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