CLI

Commands

run a command in a new container

docker run

• spec: Each time we execute docker run, the Dockerfile is read. This is why calling docker run on an existing container wouldn't make any sense.

show all running containers in docker engine

docker ps

• pass -a to see all containers
• docker-compose ps will list containers in the docker engine that are related to the images specified in docker-compose.yml (therefore dc ps is a subset of docker ps)

Start a container

docker container run --publish 8000:8080 --detach --name bb <APP NAME>

• --publish asks Docker to forward traffic incoming on the host’s port 8000, to the container’s port 8080
  • containers have their own set of ports
• notice, we didn’t specify what process we wanted our container to run. We didn’t have to, since we used the CMD directive when building our Dockerfile; thanks to this, Docker knows to automatically run the process npm start inside our container when it starts up
• visit application at localhost:8000

Show all containers

docker container ls

Filter containers by those created by mongo image

docker container ls -f ancestor=mongo