dockerfile - docker中怎样覆盖掉父镜像entrypoint

Question

请教一个问题：
父镜像和子镜像同时指定了entrypoint
子镜像好像不覆盖父镜像的entrypoint
怎样能把父镜像的entrypoint覆盖掉？

Answer 1

In fact, the ENTRYPOINT of the child image can override the ENTRYPOINT of the parent image. Let’s take a look at an example:

Parent image Dockerfile

FROM ubuntu:14.04
ENTRYPOINT ["whoami"]

Build parent image

sudo docker build -t kiwenlau/father .

Sub-mirror Dockerfile

FROM kiwenlau/father
ENTRYPOINT ["hostname"]

Build sub-mirror:

sudo docker build -t kiwenlau/son .

Run the parent image:

sudo docker run kiwenlau/father
root

Run sub-mirror

sudo docker run kiwenlau/son
cb2b314c47db

It can be seen that the parent image outputs the user name in the container, and the child image outputs the host name of the container. The ENTRYPOINT of the child image overwrites the ENTRYPOINT of the parent image

Answer 2

Based on the last ENTRYPOINT, the previous ones will be overwritten