ehlxr/docker_practice
1
0
Fork 0
mirror of https://github.com/yeasy/docker_practice.git synced 2026-08-10 08:27:25 +00:00
Code Issues Projects Releases Wiki Activity

fix(07): note FROM uses pre-FROM ARG, not ENV, for variable substitution

Browse Source
This commit is contained in:
yeasy
2026-05-28 11:38:27 -07:00
parent f09e800020
commit 2185211041
1 changed files with 2 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
07_dockerfile/7.6_env.md
+2
View File
@@ -89,6 +89,8 @@ const dbUrl = process.env.DATABASE_URL;
| `LABEL` | `LABEL version=$VERSION` | | `LABEL` | `LABEL version=$VERSION` |
| `FROM` | `FROM node:$NODE_VERSION` | | `FROM` | `FROM node:$NODE_VERSION` |
> **注意**：`FROM` 是上表中的特例——它只能引用在第一条 `FROM` 之前用 `ARG` 声明的变量，**无法**使用 `ENV` 定义的环境变量（`ENV` 要进入构建阶段后才生效）。其余指令才能引用 `ENV` 环境变量。
--- ---
### 7.6.5 运行时覆盖 ### 7.6.5 运行时覆盖