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Docker CLI

What is the difference between buildx and just build?​

buildx is a command that uses BuildKit, a new, more powerful builder.

How to run multiple containers?​

Use Docker Compose.

How to build an image?​

Image parameters are defined in the Dockerfile.

The "Dockerfile" name is used by default.

By default, the Dockerfile from the current working directory will be used.

docker build .

Set image name:

docker build . --tag repo_name:image_name

Set build time variables:

docker build . --build-arg ARG_1_NAME=ARG_1_VALUE --build-arg ARG_2_NAME=ARG_2_VALUE

Custom name of Dockerfile:

docker build -f some/path/MyDockerfile

Other useful options:

  • --progress=plain - output full log;
  • --no-cache - disable cache;
  • --rm -- remove intermediate containers after a successful build;
  • -q, --quiet - quiet mode, if successful the output will be the image identifier;

How to display full log when building image?​

docker build . --progress=plain

How to disable cache when building an image?​

docker build . --no-cache

How to manage (start/pause/restart/stop) a container?​

docker run -d --name MY_CONTAINER -p 80:5080 -p 443:5443 -e ASPNETCORE_URLS="http://+:5080;https://+:5443" ${IMAGE_ID_OR_NAME}
  • -d, --detach - background mode;
  • -e, --env - set environment variables;
  • -p, --publish - forward container port(s) on host (host_port:container_port);
  • --name - assign container name;

To start, pause, restart, and stop of the container there are commands with the same name:

docker start ${CONTAINER_NAME_OR_ID}

How to view container logs?​

docker logs ${CONTAINER_NAME_OR_ID}
  • --details - show extra data;
  • -n, --tail - show number of lines from end of log;

How to remove a container?​

docker rm ${CONTAINER_NAME_OR_ID}
  • -f, --force - stop and remove;

How to get a list of containers?​

docker ps

All containers:

docker ps -a

Latest created containers:

docker ps -l

Without truncation of long strings:

docker ps --no-trunc

It is possible to use grep to filter the output:

docker ps -a | grep ${SEARCH_STRING}

How to get a list of images?​

docker image list --all
  • -a, --all - show all images;
  • --no-trunc - without truncation of long strings;

How to view image history?​

docker image history ${IMAGE_NAME_OR_ID}

How to remove an image?​

docker rmi ${IMAGE_NAME_OR_ID}

How to view the creator of the image?​

docker inspect ${IMAGE_NAME_OR_ID}

How to view a container files?​

docker create --name="${CONTAINER_NAME_OR_ID}" ${IMAGE_NAME_OR_ID}
docker export ${CONTAINER_NAME_OR_ID} | tar -t
docker rm ${CONTAINER_NAME_OR_ID}

How to export a container to a file?​

docker export ${CONTAINER_NAME_OR_ID} > output.tar

How to execute a command in a container?​

docker run --name ${CONTAINER_NAME_OR_ID} -d -i -t ${IMAGE_NAME_OR_ID} /bin/sh
docker exec -it ${CONTAINER_NAME_OR_ID} /bin/bash
docker exec -it ${CONTAINER_NAME_OR_ID} /bin/sh

How to clear resources?​

Remove unused images, containers, and networks
docker system prune
Stop and remove ALL, ALL, ALL
docker system prune -a
Remove only unused images
docker image prune
Remove only stopped containers
docker container prune
Remove only unused volumes
docker volume prune
Remove only unused networks
docker network prune