Question

我在这里有一个dockerfile：

cp: error reading '/content/drive/My Drive/np_data.zip': Operation canceled

输出为

FROM golang:1.13-alpine as build
ARG DIR=somevalue
RUN echo $DIR

当我尝试将DIR替换为另一个名称示例DIR1时，DIR始终为空。 Docker版本在这里

Sending build context to Docker daemon  57.37MB
Step 1/3 : FROM golang:1.13-alpine as build
 ---> 2e384b27f926
Step 2/3 : ARG DIR=somevalue
 ---> Running in 3cd3457a795f
Removing intermediate container 3cd3457a795f
 ---> ecfa2f50c4fa
Step 3/3 : RUN echo $DIR
 ---> Running in aab4e31e0e14

Removing intermediate container aab4e31e0e14
 ---> 5351cb77c245
Successfully built 5351cb77c245

但是，当我尝试另一台机器时，它是正确的，它将回显一些值。谁能给我一些提示，以查找有关错误机器的问题？谢谢。

Answer 1

您可以通过传递--no-cache选项来尝试运行吗，它对我来说工作正常

❯❯❯ docker build . --no-cache
Sending build context to Docker daemon  194.7MB
Step 1/3 : FROM golang:1.13-alpine as build
 ---> 2e384b27f926
Step 2/3 : ARG DIR=somevalue
 ---> Running in c53bbb64dda1
Removing intermediate container c53bbb64dda1
 ---> b76b21aca433
Step 3/3 : RUN echo $DIR
 ---> Running in 6c49d289e258
somevalue
Removing intermediate container 6c49d289e258
 ---> d51e5579f1cb
Successfully built d51e5579f1cb

但是，如果它曾经构建过一次相同的图像，则由于已缓存了该图层，因此不会输出任何内容：

❯❯❯ docker build .
Sending build context to Docker daemon  194.7MB
Step 1/3 : FROM golang:1.13-alpine as build
 ---> 2e384b27f926
Step 2/3 : ARG DIR=somevalue
 ---> Using cache
 ---> b76b21aca433
Step 3/3 : RUN echo $DIR
 ---> Using cache
 ---> d51e5579f1cb
Successfully built d51e5579f1cb

Docker构建ARG始终为空字符串

1 个答案: