无法访问在 docker 容器中运行的 Node.js 应用程序

Question

I want to run a node.js app in a docker container using docker-compose. The app is TiddlyWiki, there are other containers and the whole thing runs in a vagrant VM and is set up with ansible, but I don't think any of that matters for this problem.

This is my docker-compose config:

        wiki:
          image: node:12-alpine
          container_name: nodejs
          restart: always
          working_dir: /home/node/app
          environment:
            NODE_ENV: production
          volumes:
            - "/srv/docker_wiki/:/home/node/app"
          ports:
            - "8080:8080"
          command: "node node_modules/tiddlywiki/tiddlywiki.js mywiki --listen debug-level=debug"

The app seems to start up and run without issues:

vagrant@vserver:~$ sudo docker logs nodejs
Serving on http://127.0.0.1:8080
(press ctrl-C to exit)
syncer-server-filesystem: Dispatching 'save' task: $:/StoryList

But I cannot reach it:

vagrant@vserver:~$ curl http://localhost:8080
curl: (52) Empty reply from server
vagrant@vserver:~$ curl http://localhost:8080
curl: (56) Recv failure: Connection reset by peer

It seems random which of the two different error messages comes up.

An interesting detail: If I use the default node image which comes itself with curl, then I can in fact reach the app from within the container itself after running docker exec -it nodejs /bin/bash

I have also tried to use a different port on the host, with the same result.

Any idea what could be going wrong here?

Answer 1

An interesting detail: If I use the default node image which comes itself with curl, then I can in fact reach the app from within the container itself after running docker exec -it nodejs /bin/bash

If you are able to access inside the container, it means the application bind with 127.0.0.1 the localhost of the container.

Serving on http://127.0.0.1:8080
(press ctrl-C to exit)

All need to bind it with 0.0.0.0 .

so change the command to

command: "node node_modules/tiddlywiki/tiddlywiki.js mywiki --host 0.0.0.0 --listen debug-level=debug"

or

command: "node node_modules/tiddlywiki/tiddlywiki.js mywiki --listen debug-level=debug host=0.0.0.0"

You explore further ListenCommand here.