如何在遇到的第一个错误上取消dockerfile映像？

Question

如果我的dockerfile中的RUN命令出错，它就会继续执行下一个命令。

Answer 1

您确定该命令确实返回了错误吗？以下Dockerfile无法访问echo foo：

FROM alpine
RUN false
RUN echo foo

它得到：

# docker build .
Sending build context to Docker daemon 3.072 kB
Step 0 : FROM alpine
 ---> 0a3b5ba3277d
Step 1 : RUN false
 ---> Running in 22485c5e763c
The command '/bin/sh -c false' returned a non-zero code: 1

要检查您的命令是否真的失败，您可以尝试这样的事情：

FROM alpine
RUN false || echo failed
RUN echo foo

然后让我：

# docker build .
Sending build context to Docker daemon 3.072 kB
Step 0 : FROM alpine
 ---> 0a3b5ba3277d
Step 1 : RUN false || echo failed
 ---> Running in 674f09ae7530
failed
 ---> 232fd66c5729
Removing intermediate container 674f09ae7530
Step 2 : RUN echo foo
 ---> Running in c7b541fdb15c
foo
 ---> dd1bece67e71
Removing intermediate container c7b541fdb15c
Successfully built dd1bece67e71