Dockerfile中RUN和CMD之间的区别 [英] Difference between RUN and CMD in a Dockerfile

问题描述

对于何时应使用 CMD 和 RUN 感到困惑。例如，要执行bash / shell命令（即 ls -la ），我将始终使用 CMD 或是否存在我将使用 RUN 的情况？试图了解有关这两个类似的 Dockerfile 指令的最佳实践。

I'm confused about when should I use CMD vs RUN. For example, to execute bash/shell commands (i.e. ls -la) I would always use CMD or is there a situation where I would use RUN? Trying to understand the best practices about these two similar Dockerfile directives.

推荐答案

RUN 是映像构建步骤，即 RUN 命令将被提交到容器映像。一个Dockerfile可以具有许多 RUN 步骤，这些步骤彼此叠加以构建映像。

RUN is an image build step, the state of the container after a RUN command will be committed to the container image. A Dockerfile can have many RUN steps that layer on top of one another to build the image.

CMD 是启动构建映像时容器默认执行的命令。 Dockerfile将仅使用最后定义的 CMD 。使用 docker启动$ image $ other_command 启动容器时，可以覆盖 CMD 。

CMD is the command the container executes by default when you launch the built image. A Dockerfile will only use the final CMD defined. The CMD can be overridden when starting a container with docker run $image $other_command.

ENTRYPOINT 与 CMD 也密切相关，并且可以修改容器启动图像的方式。

ENTRYPOINT is also closely related to CMD and can modify the way a container starts an image.

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