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Docker Snippets

Changing rights inside a container

  1. Access the container by using

    docker exec -it containername /bin/bash

## Or if this doesn't work (because you use the shell in windows), try:
docker exec -it containername //bin//bash

  2. cd to the folder you want to change the rights of.

  3. Run

    sudo chown -R user:user .

    to change the rigths of the current folder for the user user to make him able to read (which states the capital R).

Build a dockerfile

## Build with a custom tag:
docker build -t tagname .

## Build with custom dockerfile and custom tag:
docker build -f Dockerfile -t containername:tag .

Push an image to a hub/harbor

## Login to the harbor:
docker login "https://docker.hub.org/url"

## Push an existing image (the name of the image is its URL):
docker push https://docker.hub.org/url/IMAGE_NAME:VERSION_TAG

Docker run

docker run -it containername bash

Docker-compose options

Run container

The suffix -d releases the console after starting the container. So the console won't be flooded/blocked.

## Start a local docker-compose.yml file in the current directory:
docker-compose up -d

## Run a specific docker-compose file:
docker-compose -f custom.docker-compose.yml up -d

## Run a specific docker-compose file with a specific .env file:
docker-compose -f custom.docker-compose.yml --env-file /path/to/.env up -d

## Re-build Dockerfile specified in your docker-compose file (use the `--build` flag after the `up` command):
docker-compose --env-file ../custom.env up --build -d

Stop container (but keep changes within container)

## If there is a docker-compose.yml file in the current directory:
docker-compose stop

## OR: If you want to stop another container, obtain its CONTAINERNAME by running:
docker ps -a
## and stop this container:
docker stop CONTAINERNAME

Reset container (and reset changes within the container)

docker-compose down

Delete unused images

docker images
docker rmi IMAGE_ID

Delete exited containers

docker rm $(docker ps -qa --no-trunc --filter "status=exited")

Get infos about container status

docker ps -a

Get info about docker

docker info

Clean the cache

The docker system prune command will remove all stopped containers, all dangling images, and all unused networks:

docker system prune

Remove docker container

## List all containers:
docker ps -a
## or: 
# docker container ls -a

## Remove the container(s) by id:
docker container rm ID1 ID2

Remove docker images

docker image ls
docker image rmi ID1 ID2

Remove stopped containers

docker rm `docker ps --no-trunc -aq`

Tag an image during the build process

docker build -t "imageNAME:imageTAG" .

Don't forget the last .! =)

Tag an already built image

docker tag <old-image-name>:<old-image-tag> <new-image-name>:<new-image-tag>

Change docker path under WSL2 (PowerShell)

The new path in this example is: K:\Docker

wsl --export docker-desktop-data "K:\Docker\docker-desktop-data.tar"
wsl --unregister docker-desktop-data
wsl --import docker-desktop-data "K:\Docker" "K:\Docker\docker-desktop-data.tar" --version 2

Access an docker image with a bash inside

docker run -it IMAGENAME /bin/bash

## Try //bin//bash if the upper command doesn't work.

Send / Transfer an image without a docker registry / harbor

Reffering to https://stackoverflow.com/a/23938978 and https://stackoverflow.com/a/26226261

## Don't forget to mention the image tag, otherwise the image won't be tagged after unpacking it:
# docker save -o <path for generated tar file> <image name>
docker save -o /tmp/myfile.tar centos:16

## Then on the target system, load the file:
docker load -i <path to image tar file>

Transferring a Docker image via SSH, bzipping the content on the fly:

docker save <image> | bzip2 | ssh user@host docker load

## Or with visualization of the transfer process:
docker save <image> | bzip2 | pv | ssh user@host docker load