dockerIntro

files for the embedded community docker intro session

These files taken from the tutorial in the docker site: https://docs.docker.com/get-started/

get docker

How to install and setup docker on linux (including raspbian). Very easy.

curl -sSL https://get.docker.com | sh

sudo usermod -aG docker pi
sudo reboot

example : hello world

# Display Docker version and info
docker --version
docker version
docker info

# Execute Docker image
docker run hello-world

# List Docker images
docker image ls
docker images

# List Docker containers (running, all, all in quiet mode)
docker container ls
docker container ls --all
docker container ls -aq

example : running alpine linux

Download and run the alpine linux

docker pull alpine

docker run -it --rm alpine /bin/ash

uname -a

example demo1 : build / run / store

Example for building, running and storing a docker app from scratch.

Get the example files from https://github.com/EmbeddedERNI/dockerIntro

# get all the files

mkdir docker
cd docker

git clone -o github https://github.com/EmbeddedERNI/dockerIntro

cd dockerIntro/demo1

Build and run the image:

# build the image

docker build -t friendlyhello .

# run the image

docker run -p 4001:80 friendlyhello

# run the image as a service
docker run -d -p 4002:80 friendlyhello

Managing the containers and images:

# List all running containers
docker container ls

# List all containers, even those not running
docker container ls -a

# Gracefully stop the specified container
docker container stop <hash>

# Force shutdown of the specified container
docker container kill <hash>

# Remove specified container from this machine
docker container rm <hash>

# List all images on this machine
docker image ls -a

# Remove specified image from this machine
docker image rm <image id>
docker rmi <image id>

Uploading an image and running it (perhaps downloading it)

# Log in this CLI session using your Docker credentials (use them)
docker login


# Tag <image> for upload to registry
docker tag <image> username/repository:tag

# Upload tagged image to registry
docker push username/repository:tag

# Run image from a registry
docker run username/repository:tag

Check the image in the docker hub: https://hub.docker.com/u/carnicer/

example demo1swarm : a small swarm

Example that uses image created in previous example to form a swarm.

# initialize the swarm

docker swarm init

# deploy / start

docker stack deploy -c docker-compose.yml erniswarm


# see how it's running

docker service ls

docker service ps erniswarm_web


# connect the browser or curl, check the host names

docker container ls -q

curl -4 http://localhost:4000



# rescaling : edit the file and deploy again

docker stack deploy -c docker-compose.yml erniswarm


# turn off the swarm

docker stack rm erniswarm

docker swarm leave --force

example world cup : running on different platforms

Example that uses image created in previous example to form a swarm.

On windows, do:

docker pull cedricbl/world-cup-2018-cli-dashboard

docker run -ti -e TZ=Europe/Longyearbyen  cedricbl/world-cup-2018-cli-dashboard

On the raspberry, do the same:

docker inspect world-cup-2018-cli-dashboard | grep -i Architecture

Build (takes a long time).

docker build -t world-cup-2018-cli-dashboard-rpi github.com/cedricblondeau/world-cup-2018-cli-dashboard
#docker build -t world-cup-2018-cli-dashboard github.com/cedricblondeau/world-cup-2018-cli-dashboard

docker pull carnicer/worldcup-rpi