Docker

Installing Docker in Ubuntu

sudo apt-get install apt-transport-https ca-certificates curl gnupg-agent software-properties-common
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
sudo apt-key fingerprint 0EBFCD88
sudo add-apt-repository    "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
   $(lsb_release -cs) \
   stable"
sudo apt-get update
sudo apt-get install docker-ce docker-ce-cli containerd.io
apt-cache madison docker-ce # just see available docker images
sudo docker run hello-world # run hello world docker oimage

Taste little-bit

• image vs container: https://stackoverflow.com/questions/23735149/what-is-the-difference-between-a-docker-image-and-a-container
  • image: recipe
  • container: cake

lsb_release -a # Check ubuntu version
docker --version
sudo docker run hello-world
sudo docker image ls # show local docker images

• remove all untagged images

docker images -q --filter "dangling=true" | xargs docker rmi

• remove stopped containers

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

Making a new image

Prepare Dockerfile, requirements.txt, app.py

sudo docker build --tag=friendlyhello .
sudo docker image ls
sudo docker run -p 4000:80 friendlyhello # interactive run. ctrl-c to kill
sudo docker run -d -p 4000:80 friendlyhello # background run.
sudo docker container stop 06a366bf5d47 # hash code is the one running as background. Find it through following commands
sudo docker container ls
sudo docker image ls
sudo docker login # user account is made at https://hub.docker.com/
sudo docker tag friendlyhello hpjeondocker/friendlytutorial:0312
sudo push hpjeondocker/friendlytutorial:tag_name
sudo docker push hpjeondocker/friendlytutorial:tag_name