[英]Running Rails App in Docker Container using Non-Default Port
I have a simple rails app that has a MongoDB backend. 我有一个具有MongoDB后端的简单Rails应用程序。 I'm using Docker Compose to run the rails app and MongoDB in separate containers.
我正在使用Docker Compose在单独的容器中运行rails应用程序和MongoDB。 When I use the default rails port(which is 3000) everything runs OK.
当我使用默认的rails端口(3000)时,一切运行正常。
However, if I run the rails app on port 8080 instead using CMD ["rails", "s", "-p", "8080"]
, and expose port 8080 using EXPOSE 8080
in my Dockerfile
, then rebuild and push the image, only the MongoDB container starts up. 但是,如果我在端口8080上运行rails应用程序而不是使用
CMD ["rails", "s", "-p", "8080"]
并在Dockerfile
使用EXPOSE 8080
公开端口8080,则重新Dockerfile
并推送映像,只有MongoDB容器启动。 I also change the ports in the docker-compose.yml
to 8080:8080
. 我还将
docker-compose.yml
的端口更改为8080:8080
。
If I run the rails app without Docker on port 8080( rails s -p 8080
) it works fine. 如果我在端口8080(
rails s -p 8080
)上运行没有Docker的rails应用程序,则可以正常工作。
Why won't my rails app run in a Docker container when using port 8080, but works when using port 3000? 为什么在使用端口8080时我的rails应用程序不能在Docker容器中运行,而在使用端口3000时却可以工作?
Dockerfile Docker文件
FROM ruby:2.3.1
EXPOSE 3000
ADD . /code
WORKDIR /code
RUN bundle install
CMD ["rails", "s"]
docker-compose.yml docker-compose.yml
version: '3'
services:
web:
image: "<USERNAME>/<REPO>:<TAG_NAME>"
build: .
ports:
- "3000:3000"
volumes:
- .:/code
links:
- mongodb
environment:
- RAILS_ENV=development
mongodb:
image: "mongo:latest"
ports:
- "27017:27017"
volumes:
- .:/data
restart: always
8080:8080 is telling docker to expose 8080 in the container to 8080 on your local machine. 8080:8080告诉Docker将容器中的8080暴露给本地计算机上的8080。 Try changing it to 8080:3000 at which point it will connect 3000 from the host machine to 8080 on the docker container.
尝试将其更改为8080:3000,此时它将把3000从主机连接到Docker容器上的8080。 More info here: https://www.ctl.io/developers/blog/post/docker-networking-rules/
此处了解更多信息: https : //www.ctl.io/developers/blog/post/docker-networking-rules/
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