How to get the port numbers for a service - Docker compose file

问题

I am trying to start containers with the docker-compose.yml. I am trying to start two services, one is mongo and other is OHIF viewer.

Currently I am able to access mongo locally (localhost:27017(after port-forwarding) in desktop whereas OHIF viewer isn't possible (ports aren't visible/empty so, I am not able to access them locally). Can you guide me as to how I can set them?

As you can see from my docker-compose file that I have set network_mode:"host" to be able to access them locally in my desktop as well.

Based on my json file, I thought the port was already set (pacsIP:8042) but it's missing as shown in screenshot above when I execute "docker ps" command. Can you guide me on this? I am new to docker and your inputs will definitely be helpful. PACSIP is my docker host (remote linux server) IP. I would like to port forward them and view it in my desktop

Please find below the docker-compose.yml file

version: '3.6'
   services:
     mongo:
       image: "mongo:latest"
    container_name: ohif-mongo
   ports:
     - "27017:27017"

   viewer:
     image: ohif/viewer:latest
      container_name: ohif-viewer
      ports:
        - "3030:80"
        - "8042:8042" - # Not sure whether this is correct. I tried with and without this as well but it didn't work
      network_mode: "host"   
      environment:
         - MONGO_URL=mongodb://mongo:27017/ohif
      extra_hosts:
          - "pacsIP:172.xx.xxx.xxx"
      volumes:
         - ./dockersupport-app.json:/app/app.json

As you can see that in the volumes, I am using a dockersupport-app.json file which is given below

{
   "apps" : [{
   "name"        : "ohif-viewer",
    "script"      : "main.js",
    "watch"       : true,
    "merge_logs"  : true,
    "cwd"         : "/app/bundle/",
    "env": {
    "METEOR_SETTINGS": {
              "servers": {
                "dicomWeb": [
                                    {
                    "name": "Orthanc",
                    "wadoUriRoot": "http://pacsIP:8042/wado", # these ports 
                    "qidoRoot": "http://pacsIP:8042/dicom-web", #these ports
                    "wadoRoot": "http://pacsIP:8042/dicom-web", #these ports
                    "qidoSupportsIncludeField": false,
                    "imageRendering": "wadouri",
                    "thumbnailRendering": "wadouri",
                    "requestOptions": {
                      "auth": "orthanc:orthanc",
                      "logRequests": true,
                      "logResponses": false,

How can I access the OHIF-Viewer locally? What changes should I make to docker-compose.yml or json file? I did with and without port 8042 under "Ports" section of docker-compose file but it didn't work still.

回答1:

If you use network_mode: host it bypasses all of Docker's standard networking. In this case that includes the port mappings: since the container is directly using the host's network interface, there's nothing to map per se.

network_mode: host is almost never necessary and I'd remove it here. That should make the ports visible in the docker ps output again, and make the remapped port 3030 accessible. As it is you can probably reach your service on port 80, which presumably the service binds to, directly on the host network.