apt-get --help
Start the docker daemon
docker -d
Get help with Docker. Can also use --help on all subcommands
docker --help
Display system-wide information
docker info
Build an Image from a Dockerfile
docker build -t <image_name>
Build an Image from a Dockerfile without the cache
docker build -t <image_name> . --no-cache
List local images
docker images
Delete an Image
docker rmi <image_name>
Remove all unused images
docker image prune
Login into Docker
docker login -u <username>
Publish an image to Docker Hub
docker push <username>/<image_name>
Search Hub for an image
docker search <image_name>
Pull an image from a Docker Hub
docker pull <image_name>
Create and run a container from an image, with a custom name:
docker run --name <container_name> <image_name>
Run a container with and publish a container’s port(s) to the host.
docker run -p <host_port>:<container_port> <image_name>
Run a container in the background
docker run -d <image_name>
Start or stop an existing container:
docker start|stop <container_name> (or <container-id>)
Remove a stopped container:
docker rm <container_name>
Open a shell inside a running container:
docker exec -it <container_name> sh
Fetch and follow the logs of a container:
docker logs -f <container_name>
To inspect a running container:
docker inspect <container_name> (or <container_id>)
To list currently running containers:
docker ps
List all docker containers (running and stopped):
docker ps --all
View resource usage stats
docker container stats
To start all the services defined in your compose.yaml file:
docker compose up
To stop and remove the running services:
docker compose down
If you want to monitor the output of your running containers and debug issues, you can view the logs with:
docker compose logs
To list all the services along with their current status:
docker compose ps
https://docs.docker.com/reference/cli/docker/compose/#subcommands
To view an image's labels, use the docker image inspect command. You can use the --format option to show just the labels:
docker image inspect --format='{{json .Config.Labels}}' myimage
In a multi-stage Dockerfile, the final stage is the default target for building. This means that if you don't explicitly specify a target stage using the --target flag in the docker build command, Docker will automatically build the last stage by default.
Example:
docker build -t <name:tag> --target <target_build_stage> .
Look at the image size difference by using the docker images command:
docker images
Define the working directory by using the WORKDIR instruction. This will specify where future commands will run and the directory files will be copied inside the container image.
WORKDIR /appCOPY: Copy files into the current working directory within the Docker container.
Copy the src directory from your project on the host machine to the working directory within the container.
COPY src ./srcRUN: Execute a command within the container.
CMD: Set the default command to be executed when the container starts.
- Create a new directory and inside that directory, create a
compose.yamlfile with the following contents:
services:
app:
image: docker/welcome-to-docker
ports:
- 8080:80-
Open a terminal and navigate to the directory you created in the previous step.
-
Use the
docker compose upcommand to start the application. -
Open your browser to http://localhost:8080.
Volumes have their own lifecycle beyond that of containers and can grow quite large depending on the type of data and applications you’re using. The following commands will be helpful to manage volumes:
list all volumes:
docker volume ls
remove a volume (only works when the volume is not attached to any containers):
docker volume rm <volume-name-or-id>
remove all unused (unattached) volumes:
docker volume prune
The -f will stop the container first and then remove it:
docker rm -f <the-container>