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Welcome to the docker wiki!

Virtualization

• Virtualization : Virtual Machine vs. Container
• VM: Hardware level, Type-1(bear metal) & Type 2(Virtual Box, VMWare,...) Hypervisor
• Container: OS level, namespace & cgroups(resource management) isolation, docker

Docker installation

• Windows & Linux : instal docker-toolbox

Docker container commands

• docker run busybox echo Hello Docker // create a container using busybox image
• docker ps -a
• docker rm
• docker inspect

Docker images commands

• run : create a container
• docker images
• docker rmi
• docker build
• docker commit
• docker save
• docker import
• docker history
• docker tag

Docker image creation & push to remote repository

• http://phusion.github.io/baseimage-docker/
• docker run -t -i phusion/baseimage:0.9.16 /sbin/my_init -- bash -l // extending base image

• apt-get update && apt-get install vim

• exit

• docker ps -a
• docker commit phusion-base-with-vim // create a new image
• docker images
• docker tag cgshome2/phusion-base-with-vim:1.0.0
• docker login // use docker hub credential
• docker push cgshome2/phusion-base-with-vim:1.0.0 // push image to remote repository

Docker file

• cat Dockerfile // nodejs Source: package.json, index.js

# consists of base image, layer, command
FROM    centos:centos6

RUN \
    rpm -Uvh http://download.fedoraproject.org/pub/epel/6/i386/epel-release-6-8.noarch.rpm 
RUN \
    yum install -y npm
COPY . /src  
RUN \
    cd /src; npm install  # install app dependency

EXPOSE 8080
CMD ["node", "/src/index.js"]

• docker build -t="cgshome2/hello-nodejs:1.0.0" . // docker build create images from Dockerfile
• Run daemonizely
  • docker rm $(docker ps -qa)
  • docker run -d -p 8080:8080 cgshome2/hello-nodejs:1.0.0 // run container
  • docker ps -a
  • docker logs -f
  • docker inspect // to find ip
  • curl -i :8080 // linux
  • curl $(boot2docker ip):8080 // window & osx
• Run interactively
  • docker run -d -p 8080:8080 -t -i --name dev cgshome2/javadev:1.0.0 bash // run container interactively
  • docker attach dev // access into container
  • curl -l localhost:8080
• cat Dockerfile // java

FROM java:openjdk-7-jdk
MAINTAINER GunSik

RUN \
    apt-get update && \
    echo "===> install maven" \
    apt-get install -y maven

WORKDIR /code                      # Create a work directory
COPY pom.xml /code/pom.xml
COPY src /code/src
CMD ["mvn", "package"]
CMD ["mvn", "exec:java"]
EXPOSE 8080     

Docker file for multiple node provisioning, orchestration, and automation

• Shutdown docker when app stops
• Chroot env.
• Namespaces : process isolation(ipc, uts, mount, pid, network, user)
• Control groups : resource isolation
• Container