How to make work "strapi develop --watch-admin"?

[aminta]

My composer file is:

version: '3'
services:
  strapi:
    image: strapi/strapi
    environment:
      DATABASE_CLIENT: postgres
      DATABASE_NAME: strapi
      DATABASE_HOST: postgres
      DATABASE_PORT: 5432
      DATABASE_USERNAME: strapi
      DATABASE_PASSWORD: strapi
    volumes:
      - ./app:/srv/app
    ports:
      - '1337:1337'
      - '8000:8000'
    depends_on:
      - postgres

  postgres:
    image: postgres
    environment:
      POSTGRES_DB: strapi
      POSTGRES_USER: strapi
      POSTGRES_PASSWORD: strapi
    volumes:
      - ./data:/var/lib/postgresql/data
    ports:
      - '5432:5432'  

When the server is started, in Docker attached shell I type: strapi develop --watch admin and I get:

debug ⛔️ Server wasn't able to start properly.
[2021-06-28T18:34:00.151Z] error The port 1337 is already used by another application.
root@af70eda90919:/srv/app# ℹ ｢wds｣: Project is running at http://localhost:8000/
ℹ ｢wds｣: webpack output is served from /admin/
ℹ ｢wds｣: Content not from webpack is served from /srv/app
ℹ ｢wds｣: 404s will fallback to /admin/
Starting the development server...

Admin development at http://0.0.0.0:8000/admin/

I can connect to http://0.0.0.0:8000/admin/ but when I log in with the correct password I get:

Failed to load resource: the server responded with a status of 400 (Bad Request)

and http://0.0.0.0:1337/admin/ is still up...

How can I first stop strapi develop and then launch strapi develop --watch admin?

[1019058432]

Hello, I also have such doubts. Is there a correct way to use it? Or who will resolve this doubt for me? thanks

[ChristianHeimke]

you have two different options:

option A

you just need to overwrite the docker command set in the Dockerfile of the strapi/strapi image in your compose file (L5):

version: '3'
services:
  strapi: 
    image: strapi/strapi
    command: strapi develop --watch admin
    environment:
      DATABASE_CLIENT: postgres
      DATABASE_NAME: strapi
      DATABASE_HOST: postgres
      DATABASE_PORT: 5432
      DATABASE_USERNAME: strapi
      DATABASE_PASSWORD: strapi
    volumes:
      - ./app:/srv/app
    ports:
      - '1337:1337'
      - '8000:8000'
    depends_on:
      - postgres

  postgres:
    image: postgres
    environment:
      POSTGRES_DB: strapi
      POSTGRES_USER: strapi
      POSTGRES_PASSWORD: strapi
    volumes:
      - ./data:/var/lib/postgresql/data
    ports:
      - '5432:5432'  

this should prevent the strapi develop command and use the strapi develop --watch admin.

option B

You can also overwrite the command during the start of docker-compose without changing the compose file:

docker-compose run strapi strapi develop --watch admin

(more detailed information can be found here: docker-compose run)

[bora89]

@ChristianHeimke it is not enough just to run with --watch admin, port 8000 should be exposed somehow and host should be probably 0.0.0.0 in config/admin.js, I have not figured it out myself