Docker

Introduction
Commands
Links
Example
Building images [WIP]
Running
Creating a network

Introduction

Image : Template for environment (OS, Software, Applications)
Container : Running instance of an image
Dockerfile : Text document that contains all the commands to assemble an image.
Volumes : Preferred mechanism for persisting data generated by and used by Docker containers
Kubernetes: Container-orchestration system for automating application deployment, scaling, and management.

Commands

docker run image
docker start container
docker stop container
docker ps
docker ps -a (for stopped containers)
docker rm $(docker ps -a -q) (remove all stopped containers)
docker rm container

Example

Running a Jupyter Tensorflow Notebook Server:


docker run --rm -p 8888:8888 -v "$PWD":/home/jovyan/work jupyter/tensorflow-notebook:latest

Here, ' -p 888:8888 ' maps the machines 8888 port to containers 8888 port. Also, ' -v <machine_path>:<container_path> ' maps the machines working directory to container's path (usually predefined). Here we map ' $PWD ' i.e current directory's path with container's predefined path '/home/jovyan/work'. For more info lookup: jupyter-notebook stacks

Building images [WIP]

Create a dockerfile with image config:


FROM alpine:latest
CMD ["apt-get","install","nfd"]

Build image


$ docker build -t imagename .

Building an image could be hectic if the commands are not ordered properly. Here are some tips:

1. Avoid using '&&' between all RUN commands as this disables checkpointing (using cache).
2. Use COPY commands after RUN commands. This enables checkpointing(using cache) after every RUN.

Running

Running as a daemon and accessing container shell


$ docker run -it -d --name container_name image_name /sbin/init
$ docker exec -it container_name sh

Creating a network


$ docker network create network_name
$ docker run --network network_name --name container_name image_name

Last updated 28 March 2020