Docker将容器推送到私有注册表

Question

I have an app which uses several docker containers:

1. NGINX container
2. NodeJS sails app container
3. Redis cache container

Since I'm using existing images for two of the above containers, I also have two cached containers:

4. alpine
5. redis

I'm trying to push my containers (1, 2, & 3) to AWS Elastic Container Registry (ECR). I've been able to do this, but have noticed that my cached containers (4 & 5) get pushed too.

I'm building the containers using docker-compose , and then tagging like so:

docker tag -f nodejs_app:latest <repository URL>:latest

After logging into ECR with docker login , I push using this command:

docker push <repository URL>:latest

Docker then pushes all 5 containers up into the registry. How do I only push the containers that I care about and not the cached ones too?

Thanks in advance :-)

Answer 1

How do I only push the containers that I care about and not the cached ones too?

You don't.

Docker images (not containers ; a container is what you get when you boot an image ) are built from layers. Your nginx image, for example, consists of all the layers from the alpine image, followed by any layers that are created as the result of your Dockerfile .

In order for your new image to be stored in a private repository, all the underlying layers need to be available . This means that in addition to the layers you create via your Dockerfile , all the layers from the alpine image also need to be pushed to the repository as well.

So if you build an image on top of the alpine image and push it to a private repository, the alpine image will get pushed there as well.