Docker

notes about how to do things with docker for reference.

Installation

Best to get the version directly from docker.com, see:

https://docs.docker.com/engine/install/debian/

https://docs.docker.com/engine/install/ubuntu/

Images

You can get official images via docker directly. See https://hub.docker.com/ - this shows the commands to pull images.

Example:

docker pull debian

Containers

Creating a container from the image can be done as follows:

Create a container debian_test based on the debian image with full host network access, launch it and attach to it.

docker run -it --net=host --name=debian_test debian

If the container is off, you can do the following:

# start the container
docker start debian_test
# attach to it
docker container attach debian_test
# when you're done
docker stop debian_test

Show all containers, running and not running:

docker ps -a

Create a container based on debian image, attach a shared storage and host network to container. Syntax is `-v HOST_SOURCE_DIR:GUEST_DESTINATION_DIR

docker run -it --net=host --name=debian_test -v ~/docker/container_data:/data debian

Network Interfaces

Create a container deb0 with shared storage and attach it to a bridge network. Create another container deb1.

docker run -it -h deb0 --net=bridge --name=deb0 -v ~/docker/container_data:/data debian
docker run -it -h deb1 --net=bridge --name=deb1 -v ~/docker/container_data:/data debian

Get the IP address of a container

docker inspect <container_id> | grep IPAddress

Multiple Network Interfaces:

see: https://stackoverflow.com/questions/34110416/start-container-with-multiple-network-interfaces

docker create --network=network1 --name container_name containerimage:latest
docker network connect network2 container_name
docker start container_name
docker network create --driver=bridge network1 --subnet=172.19.0.0/24
docker network create --driver=bridge network2 --subnet=172.19.1.0/24

Image from Container

Show images

docker images -a

Save container with a tag

docker commit [container name] [image name]

Save a container WITHOUT A TAG

docker commit [container name]

Container is saved with tag none

now you can tag it.

docker tag [container ID] name

Save an Image / Container

docker save [image ]> [image].tar
docker save [image]:latest | gzip > [name].tar.gz

Docker Notes