Docker

Tool
name	Docker
logo
logourl
website	https://www.docker.com/
wikipediaurl	https://en.wikipedia.org/wiki/Docker_%28software%29
stackoverflow link	http://stackoverflow.com/questions/tagged/docker
no of stackoverflow questions	49,616
Category	Build
pollResult

Virtual Machine versus Container

Introduction to Docker by Solomon Hykes

Shipping code to the server is too hard
Docker uses separation of concerns (just like the Y-principle) to make shipping easier
Docker images are manipulated git style with ids, diffs, commits, pushs and pulls

Links

https://twitter.com/docker

Installation

Installation of Docker on Mac OS X

https://docs.docker.com/installation/mac/

Download Docker Toolbox
Install (e.g. DockerToolbox-1.8.3.pkg)
Either Use Kitematic Visual Management for Docker or Docker Quickstart Terminal Command Line Interface

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      ~~~ {~~ ~~~~ ~~~ ~~~~ ~~~ ~ /  ===- ~~~
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docker is configured to use the default machine with IP 192.168.99.100
For help getting started, check out the docs at https://docs.docker.com

Installation of Docker on Linux

see https://docs.docker.com/installation/ubuntulinux/

Docker command examples

upgrade docker machine

docker-machine upgrade default

list running docker processes

bash-3.2$ docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES

get and start the latest ubuntu image

docker run ubuntu

see which images are available

bash-3.2$ docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
ubuntu              latest              0a17decee413        4 days ago          188.4 MB
bash-3.2$

start a bash shall in ubuntu

docker run -i -t ubuntu /bin/bash

modify the image by creating new directory

root@84506e084bb9:/#touch /test

look at processes again and check the difference of the image with the given container id

bash-3.2$ docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
84506e084bb9        ubuntu              "/bin/bash"         2 minutes ago       Up 2 minutes                            pensive_wozniak
bash-3.2$ docker diff 84506e084bb9
A /test

install some software

root@84506e084bb9:/#apt-get install php5
root@84506e084bb9:/#apt-get install mysql-server

commit the changes to images with the name "lamp" and check the image list again

bash-3.2$ docker commit 84506e084bb9 lamp
8ba719cd9b0eae589b70f6b6ddd567b4c20f997fc2d8f4c6feb313d73c2d5c3a

bash-3.2$ docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
lamp                latest              8ba719cd9b0e        20 seconds ago      349.5 MB
ubuntu              latest              0a17decee413        4 days ago          188.4 MB
bash-3.2$

docker version
Client:
 Version:      1.8.3
 API version:  1.20
 Go version:   go1.4.2
 Git commit:   f4bf5c7
 Built:        Mon Oct 12 18:01:15 UTC 2015
 OS/Arch:      darwin/amd64

Server:
 Version:      1.8.3
 API version:  1.20
 Go version:   go1.4.2
 Git commit:   f4bf5c7
 Built:        Mon Oct 12 18:01:15 UTC 2015
 OS/Arch:      linux/amd64

Useful scripts

Docker goodies

Static content example

Use the nginx image from https://github.com/docker-library/docs/tree/master/nginx

docker run --name icon_html -v /Users/wf/Documents/workspace/com.bitplan.icons/src/main/resources/com/bitplan/icons:/usr/share/nginx/html:ro -d -p 8080:80 nginx

find out the ip address for the mapping (Mac OS X)

docker-machine env default
export DOCKER_HOST="tcp://192.168.99.100:2376"

try out via

http://192.168.99.100:8080/48x48/shadow/wrench.png

Dockerfile

The process can be automated using a Dockerfile

Critics

Docker book