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复制支持可变目的地吗?

copy docker

StoneThrow · 技术社区 · 4 年前

是否可以在Dockerfile中指定变量dest dir COPY ?

E、 g.鉴于此Dockerfile:

ARG dest_dir=/foo/bar/

FROM alpine:3.7 as base
COPY ./ ${dest_dir}

... docker build

$ docker build .
[+] Building 0.3s (7/7) FINISHED
 => [internal] load build definition from Dockerfile                                                                                                                                                                                                    0.0s
 => => transferring dockerfile: 118B                                                                                                                                                                                                                    0.0s
 => [internal] load .dockerignore                                                                                                                                                                                                                       0.0s
 => => transferring context: 2B                                                                                                                                                                                                                         0.0s
 => [internal] load metadata for docker.io/library/alpine:3.7                                                                                                                                                                                           0.0s
 => CACHED [1/2] FROM docker.io/library/alpine:3.7                                                                                                                                                                                                      0.0s
 => [internal] load build context                                                                                                                                                                                                                       0.0s
 => => transferring context: 106B                                                                                                                                                                                                                       0.0s
 => [2/2] COPY ./                                                                                                                                                                                                                                       0.1s
 => exporting to image                                                                                                                                                                                                                                  0.1s
 => => exporting layers                                                                                                                                                                                                                                 0.1s
 => => writing image sha256:e761939bd6a8092e51e37b08d3b4ca196d310d5e36d232252313cdddd68adace                                                                                                                                                            0.0s

上面要注意的是,在第2/2步中 复制 没有第二个论点。
ARG 值,它在 复制

1 回复 | 直到 4 年前

Omer Tuchfeld 4 年前

当 ARG FROM 语句,它只适用于处理它的FROM语句。如果你想语句应用于文件的其余部分, it must appear after the FROM statement

这样地:

FROM alpine:3.7 as base

ARG dest_dir=/foo/bar/
COPY ./ ${dest_dir}