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Docker basics Commands list

# Docker basics Commands list

## Docker installation

### Ubuntu

official _Ubuntu_ installation guide:

#### uninstall older version, if applicable

sudo apt-get remove docker docker-engine containerd runc docker-ce docker-ce-cli

#### installation from Docker respositories

#update package index
sudo apt-get update
# install packages to allow apt using https repositories
sudo apt-get install apt-transport-https ca-certificates curl gnupg-agent software-properties-common
# add Dockers GPG key
curl -fsSL | sudo apt-key add -
# configure the STABLE repository
sudo add-apt-repository \
"deb [arch=amd64] $(lsb_release -cs) stable"
# ....and start the installation
sudo apt-get update && sudo apt-get install docker-ce docker-ce-cli

Check the installation, by running a _hello world_ container:
sudo docker run hello-world

**Post-install steps to run _docker_ without prefixing it with _sudo_**

sudo groupadd docker
sudo usermod -aG docker $USER

If you used docker via _sudo docker_ before, you will run the following now:

sudo chown "$USER":"$USER" /home/"$USER"/.docker -R
sudo chmod g+rwx "$HOME/.docker" -R

Check without _sudo_, by running a _hello world_ container:
docker run hello-world

### Windows###

For users with Windows 10 64-bit **Pro** or **Enterprise** or **Education**-version, use _Docker Desktop_ as shown here:

Users with Windows 10 **Home**, Windows pre-10 versions, use _Docker Toolbox_ as shown here:
> Docker Toolbox ships also Oracle VirtualBox as virtualization solution, thereby this package is huge (~ 1GB) and
> should just be used if there are no other possibilities to run Docker.
> Windows 10 Home users should think about enabling the builtin Linux subsystem and install Ubuntu there !!

### Mac###

**Docker Desktop**: for Mac hardware >2010 and MacOS >= 10.13

**Docker Toolbox**: for Mac users that do not cover above criteria

## Docker base commands##

# check version
docker version

# list images
sudo docker image ls
# delete an image
sudo docker image rm # where is shown in output of “sudo docker image ls

# list containers
sudo docker container ls [--all]
# delete a container
sudo docker container rm # where is shown in the output of “sudo container ls –all”

# run a container
sudo docker run
# run an ubuntu container, provide env variables and run command “env” within container to check for the variable provided
sudo docker run -e ENV_VAR1=myvalue1 ubuntu env | grep ENV_VAR

# run a plain nginx webserver,
# with random port assignment on local port => port 80 in container
# giving it a name “my-nginx”
# start the container in the background: “-d”
sudo docker run --name my-nginx -P -d nginx

# get details of a container
sudo docker inspect
sudo docker logs

# search for e.g. “nginx” containers from public repo
sudo docker search nginx

First container creation

cat > Dockerfile < Dockerfile <<EOF
FROM ubuntu:latest
RUN DEBIAN_FRONTEND=noninteractive apt-get update
RUN DEBIAN_FRONTEND=noninteractive apt-get -yq install net-tools nginx
ENTRYPOINT ["/usr/sbin/nginx", "-g", "daemon off;"]

# build your image
sudo docker build -t / .

# test your container locally
sudo docker run / .

# push it to your Docker repository
sudo docker push /

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