Install
curl -sSL -O https://get.docker.com/builds/Linux/x86_64/docker-1.9.1 && chmod +x docker-1.9.1 && sudo mv docker-1.9.1 /usr/local/bin/docker
Run daemon
sudo /usr/local/bin/docker daemon
Run client
docker info
Docker Images vs Docker Containers
Images
docker images
docker search linux
docker pull ubuntu
docker images
This does not cover how to create your own images
Containers
docker run ubuntu echo Hello World
docker ps
docker ps -a
docker logs $IMAGE_NAME
Running a container with a custom name
docker run --help | less
docker run --name HelloWorld ubuntu echo Hello World
docker ps -a
docker inspect HelloWorld | less
docker rm HelloWorld
Running an interactive container
docker run --name ubuntu_shell -t -i ubuntu bash
exit
docker start ubuntu_shell
docker exec ubuntu_shell ifconfig
docker exec -t -i ubuntu_shell bash
exit
docker ps
docker attach ubuntu_shell
exit
docker ps
docker rm ubuntu_shell
Running a web application with docker
docker run --name web -d -P training/webapp python app.py
# See https://github.com/docker-training/webapp
docker ps # Note randomly assigned port mapping
docker port web 5000
docker rm -f web
docker run --name web -d -p 5000:5000 training/webapp python app.py
docker port web 5000
curl --noproxy localhost http://localhost:5000/
docker logs web
docker top web
docker rm -f web
Network containers
Check existing docker networks
docker network ls
docker network inspect bridge
Create new network
docker network create -d bridge privatenet
docker network inspect privatenet
Start DB container in privatenet
docker run -d --net=privatenet --name db training/postgres # See https://github.com/docker-training/postgres
Start Web container in bridged network
docker run --name web -d -p 5000:5000 training/webapp python app.py
docker inspect --format='{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' web
Check IP Addresses of each container
docker inspect --format='{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' db
docker inspect --format='{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' web
Check DB container can’t access web container
docker exec -it db bash
ping $WEB_IP_ADDRESS
exit
docker network connect privatenet web
docker inspect --format='{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' web
docker inspect --format='{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' db
docker exec -it db bash
ping $WEB_PRIVATE_NET_IP_ADDRESS
ping web
exit
docker rm -f web db
Mounting volumes in containers
Volume characteristics
- Initialized when a container is created
- Can be shared and reused among containers
- Changes to a data volume are not included when an image is updated
- Data volumes persist even if the container is deleted
Sharing data between container and host
mkdir myfiles
echo Hello > myfiles/hello
docker run -it --name ubuntu -v $PWD/myfiles:/myfiles ubuntu bash
ls -l /myfiles
exit
docker inspect ubuntu | less # search for Mounts
Sharing data between containers
TODO
