How to push to a compose-built image to ECR manually?

Question

I have a docker-compose file:

version: '3.4'
services:
  nginx:
    container_name: some-nginx
    image: nginx:latest
    restart: always
    ports:
      - 80:80
      - 443:443

  mongodb:
    container_name: some-mongo
    image: mongo:latest
    environment:
      - MONGO_DATA_DIR=/data/db
      - MONGO_LOG_DIR=/dev/null
    ports:
      - 27017:27017
    command: mongod --smallfiles --logpath=/dev/null # --quiet

I want to push to Amazon Elastic Container Registry (ECR), using the commands:

docker tag testapper:latest 619625705037.dkr.ecr.us-east-2.amazonaws.com/testapper:latest

But I got an message:

Error response from daemon: No such image: testapper:latest

When I run docker-compose build I got this message:

nginx uses an image, skipping
mongodb uses an image, skipping

What does this mean? How do push my images to ECR?

Answer 1

Your docker containers are all using existing images (image keyword)

services:
  nginx:
    image: nginx:latest

  mongodb:
    image: mongo:latest

therefore you do not need to build them.

I believe ECS will find these official images by itself, so you do not need to push them to your private repo (ECR). (not 100% sure)

In case you do want to push a custom built image, the general flow is

docker build -t your_image_name:tag path
docker tag your_image_name:tag 619625705037.dkr.ecr.us-east-2.amazonaws.com/your_image_name:tag
# or
docker build -t 619625705037.dkr.ecr.us-east-2.amazonaws.com/your_image_name:tag path


docker push 619625705037.dkr.ecr.us-east-2.amazonaws.com/your_image_name:tag

You can use docker-compose build to build and tag at the same time if your compose file is like

services:
  nginx:
    image: 619625705037.dkr.ecr.us-east-2.amazonaws.com/your_image_name:tag
    build: ./my-nginx-path