Setup docker environment Ubuntu 16.04

Installing

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
sudo apt-get update

Run apt-cache policy docker-ce and the output will look like

docker-ce:
  Installed: (none)
  Candidate: 17.03.1~ce-0~ubuntu-xenial
  Version table:
     17.03.1~ce-0~ubuntu-xenial 500
        500 https://download.docker.com/linux/ubuntu xenial/stable amd64 Packages
     17.03.0~ce-0~ubuntu-xenial 500
        500 https://download.docker.com/linux/ubuntu xenial/stable amd64 Packages

Notice that docker is not installed and download location is download.docker.com Now you can install docker

sudo apt-get install -y docker-ce
sudo systemctl status docker

* Make sure the docker is active and running before continue

Execute docker without sudo

sudo groupadd docker
sudo gpasswd -a $USER docker

And type docker run hello-world to make sure docker running without sudo

Working with docker images

docker run hello-world Check whether docker run properly

docker search ubuntu Search docker images in Docker Hub which has ubuntu in their docker name.

docker pull ubuntu Download the docker named ubuntu to the local machine

docker run ubuntu Run a docker container with the ubuntu docker image. If it is not pulled, the imaged will be pulled before run.

docker images Show all docker images in the local machine

Running a Docker Container

docker run -it --name cotainer_name ubuntu Run a docker container with interactive shell. The output will be like: root@d9b100f2f636:/#

You can now update the container and install something.

apt-get update
apt-get install vim

Commit Changes in a Container to a Docker Image

First exit from the container with exit command. Then run the following.

exit
docker commit -m "What did you do to the image" -a "Author Name" container-id  repository/new_image_name

For example:

docker commit -m "initial commit" -a "rameshpr" d9b100f2f636 video-ml/rtpose

Run docker images and see the new image is there.

Listing Docker Containers

docker ps List all active docker containers

docker ps -a List all active and inactive docker containers

docker ps -l View status of the latest container that you created

docker stop container-id Stop the active container with container-id. It can be found using docker ps

Run stopped docker container

docker start 6ed287ad073b
docker attach 6ed287ad073b

This start the stopped container and attach the terminal to it.

Remove docker containers

docker ps -a -f status=exited View all exited docker containers

docker rm $(docker ps -a -f status=exited -q) remove all exited docker containers

Copy files from Container

docker cp <containerId>:/file/path/within/container /host/path/target Here the containerId can be the name or the ID of the container which is already started.

Guide on removing docker images, containers or volumes https://www.digitalocean.com/community/tutorials/how-to-remove-docker-images-containers-and-volumes

Change docker image and container location

https://sanenthusiast.com/change-default-image-container-location-docker/

If you want to change the size of the docker storage drive you can replace this line in docker.conf file.

ExecStart=/usr/bin/dockerd --graph="/mnt/new_volume" --storage-driver=devicemapper --storage-opt dm.basesize=20G

Then restart the docker.

More information

1. https://www.digitalocean.com/community/tutorials/how-to-install-and-use-docker-on-ubuntu-16-04
2. https://askubuntu.com/a/477554/568872