为什么客户端无法连接到localhost：8080？ [英] Why does the client can not connect to localhost:8080?

问题描述

我有以下 dockerfile ：

FROM openjdk:8 as stage0
WORKDIR /opt/docker
COPY opt /opt
USER root
RUN ["chmod", "-R", "u=rX,g=rX", "/opt/docker"]
RUN ["chmod", "u+x,g+x", "/opt/docker/bin/sapmock"]

FROM openjdk:8
USER root
RUN id -u demiourgos728 2> /dev/null || (( getent group 0 || groupadd -g 0 root ) && useradd --system --create-home --uid 1001 --gid 0 demiourgos728 )
WORKDIR /opt/docker
COPY --from=stage0 --chown=demiourgos728:root /opt/docker /opt/docker
EXPOSE 8080
USER 1001:0
ENTRYPOINT ["/opt/docker/bin/sapmock"]
CMD []  

如您所见，暴露了端口 8080 。

as you can see, that exposes the port 8080.

当我开始从图像运行容器时，如下所示：

When I start to run a container from the image as the following:

docker run -it  -p 8080:8080 db261ab225b5
Server online at localhost on the port 8080
Press RETURN to stop... 

客户端无法通过地址 localhost：8080 连接吗？

The client can not connect through the address localhost:8080 why?

推荐答案

拉杰什的答案很可能是正确的。尽管我认为您的应用更有可能只是绑定到容器内的 localhost / 127.0.0.1 将无法正常工作。确保您的应用绑定到容器内的 0.0.0.0 ，然后端口映射将起作用。

It's possible that Rajesh's answer is correct. Although I think it's more likely that your application is just binding to localhost / 127.0.0.1 inside the container, and that won't work. Make sure your app binds to 0.0.0.0 inside the container then the port mapping will work.

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