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taoky merged 2 commits into from
Oct 18, 2026
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docs(container): explain --target flag in docker multi-stage builds #84

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docs(ops): explain `--target` flag in Docker multi-stage builds
MirageTurtle Oct 18, 2026
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fix(container): fix markdownlint MD014 issue
MirageTurtle Oct 18, 2026
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8 changes: 7 additions & 1 deletion docs/ops/virtualization/container.md
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Expand Up @@ -632,7 +632,13 @@ COPY --from=builder /tmp/example /usr/local/bin/example
```

可以发现，这个 Dockerfile 有多个 `FROM` 代表了多个阶段。
第一阶段的 `FROM` 后面加上了 `AS builder`，这样就可以在第二阶段使用 `COPY --from=builder` 从第一阶段拷贝文件。
第一阶段的 `FROM` 后面加上了 `AS builder`，为第一阶段命名，这样就可以在第二阶段使用 `COPY --from=builder` 从第一阶段拷贝文件。

在阶段有命名的情况下，可以使用 `--target` 参数只构建到指定的阶段，方便调试：

```console
sudo docker build --target builder -t example:builder .
```

### 运行图形应用 {#docker-gui}

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