General Information

• Docker Cheatsheet
• Awesome-Docker

Installation

Install with Homebrew

brew install bash-completion
brew cask install docker
brew install kubectl
brew cask install minikube

After Installation, check versions

docker version
docker-compose version
docker-machine --version
kubectl version --client

First steps

Start a docker image with a given name

$ docker run --interactive --tty --name ubuntu ubuntu /bin/bash
Unable to find image 'ubuntu:latest' locally
latest: Pulling from library/ubuntu
af49a5ceb2a5: Pull complete 
8f9757b472e7: Pull complete 
e931b117db38: Pull complete 
47b5e16c0811: Pull complete 
9332eaf1a55b: Pull complete 
Digest: sha256:3b64c309deae7ab0f7dbdd42b6b326261ccd6261da5d88396439353162703fb5
Status: Downloaded newer image for ubuntu:latest
root@a5b411d609f0:/#

Run a command

root@a5b411d609f0:/# uname -a
Linux a5b411d609f0 4.4.27-moby #1 SMP Wed Oct 26 14:21:29 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
root@a5b411d609f0:/# id
uid=0(root) gid=0(root) groups=0(root)
root@a5b411d609f0:/# hostname
a5b411d609f0
root@a5b411d609f0:/#

Leave image

root@a5b411d609f0:/# exit
exit
$

 Show running images

$ docker ps -a
CONTAINER ID  IMAGE   COMMAND      CREATED        STATUS                   PORTS  NAMES
b01ba9bfef78  ubuntu  "/bin/bash"  41 seconds ago Exited (0) 2 seconds ago        ubuntu

Start image

$ docker start ubuntu
ubuntu
$ docker ps -a
CONTAINER ID  IMAGE   COMMAND      CREATED        STATUS                 PORTS   NAMES
b01ba9bfef78  ubuntu  "/bin/bash"  2 minutes ago  Up 1 seconds                   ubuntu

Attach to image, e.g. “enter” the image

Don’t forget to press enter after you entered the command do display the shell in the image again

$ docker attach ubuntu
root@b01ba9bfef78:/#

Working with Docker

$ docker run -it --name ubuntu ubuntu bash

You are in a terminal with ubuntu and can do whatever you like.

To start again after a reboot:

$ docker start ubuntu
$ docker exec -it ubuntu bash

If you want save your changes:

$ docker commit ubuntu
$ docker images

See the unnamed image and:

$ docker tag <imageid> myubuntu

Then you can run another container using your new image.

$ docker run -it --name myubuntu myubuntu bash

Or replace the former

$ docker stop ubuntu
$ docker rm ubuntu
$ docker run -it --name ubuntu myubuntu bash

Docker Components

Machines

Create machine

$ docker-machine create --driver=virtualbox default
$ docker-machine ls
NAME         ACTIVE   DRIVER       STATE     URL                         SWARM   DOCKER    ERRORS
default      -        virtualbox   Running   tcp://192.168.99.100:2376           v1.12.2   
virtualbox   -        virtualbox   Stopped                                       Unknown 

Show environment of machine

$ docker-machine env
export DOCKER_TLS_VERIFY="1"
export DOCKER_HOST="tcp://192.168.99.100:2376"
export DOCKER_CERT_PATH="/Users/docker/.docker/machine/machines/default"
export DOCKER_MACHINE_NAME="default"
# Run this command to configure your shell: 
# eval $(docker-machine env)

Stop machine

$ docker-machine stop default
Stopping "default"...
docker-Machine "default" was stopped.

Start  machine

$ docker-machine start default
Starting "default"...
(default) Check network to re-create if needed...
(default) Waiting for an IP...
Machine "default" was started.
Waiting for SSH to be available...
Detecting the provisioner...
Started machines may have new IP addresses. You may need to re-run the docker-machine env command.

Set environment of a machine

$ eval "$(docker-machine env default)"

Create machine from iso image

$ docker-machine create -d virtualbox --virtualbox-boot2docker-url https://releases.rancher.com/os/latest/rancheros.iso <MACHINE-NAME>
$ docker-machine env rancheros

Images

Images are just templates for docker containers.

List all images

$ docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
ubuntu              latest              f753707788c5        5 days ago          127.2 MB

Remove images

$ docker rmi <IMAGE ID>

Remove all images

$ docker rmi $(docker images -q)

Container

List all container

$ docker ps -a

Run command in container

$ docker run -it ubuntu bash
Unable to find image 'ubuntu:latest' locally
latest: Pulling from library/ubuntu
6bbedd9b76a4: Pull complete 
fc19d60a83f1: Pull complete 
de413bb911fd: Pull complete 
2879a7ad3144: Pull complete 
668604fde02e: Pull complete 
Digest: sha256:2d44ae143feeb36f4c898d32ed2ab2dffeb3a573d2d8928646dfc9cb7deb1315
Status: Downloaded newer image for ubuntu:latest

Run command and delete container after running

$ docker run -it --rm ubuntu hostname

Check environment in container

$ docker run -it ubuntu bash
# hostname
c26fc567f552
root@c26fc567f552:/# uname -a
Linux c26fc567f552 4.4.24-boot2docker #1 SMP Fri Oct 7 20:54:27 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

Remove all container

$ docker rm $(docker ps -a -q)

Commit container as new image

$ docker ps -a
CONTAINER ID        IMAGE                  COMMAND                  CREATED             STATUS                     PORTS               NAMES
e4a50905aa9c        continuumio/anaconda   "/usr/bin/tini -- /bi"   22 minutes ago      Exited (0) 5 minutes ago                       pedantic_kirch
164daaac2349        4f3b088e1307           "/bin/sh -c 'apt-get "   4 hours ago         Exited (100) 4 hours ago                       happy_jang
817bb15d3171        i_electron             "/bin/bash"              2 weeks ago         Exited (0) 2 weeks ago                         cranky_wilson
$ docker commit e4a50905aa9c r14r_anaconda

Tipps and Tricks

Use npm as a comand wrapper

Create a  empty npm package

$ npm init --yes

Add this lines to the package.json file

{
  "name": "development",
   ...
  "license": "ISC",
  "scripts":  {
    "build": "docker build -t development .",
    "ssh": "docker run -i -t development /bin/bash"
}

Create a Dockerfile

FROM ubuntu
RUN apt-get update && apt-get install -y firefox

Now you can build the image with

$ npm run build
$ npm run ssh

Running XClients from Docker on macOS Host (Source)

Install Homebrew

Install requires parts

$ brew install socat
$ brew cask install xquartz

Now start XQuartz

$ open -a XQuartz

Expose local xquartz socket via socat on a TCP port.
Run this in another terminal window

$ socat TCP-LISTEN:6000,reuseaddr,fork UNIX-CLIENT:\"$DISPLAY\"

The masking of the characters ” is VERY important

Run Firefox in Docker Container

$ docker run -it -e DISPLAY=server:0.0 i_firefox firefox

Create image from scratch

Scratch image

Create image from scratch

Using Linux as Docker OS

Available Linux OS’s

Beginning – Libraries and Frameworks

UI

• Angular
• Ionic
• Onson UI
• Framework 7

Unit Testing

• Karma
• Jasmine

End-to-End Testing

• http://www.protractortest.org/

Technologies

Unit Testing

Protractor (http://www.protractortest.org/)

Use npm to install Protractor globally with

npm install -g protractor

The webdriver-manager is a helper tool to easily get an instance of a Selenium Server running. Use it to download the necessary binaries with:

webdriver-manager update

Now start up a server with:

webdriver-manager start

Install a demo repository:

git clone https://github.com/juliemr/protractor-demo.git
npm install

Update selenium driver

node_modules/protractor/bin/webdriver-manager update

Run server in background:

node app/expressserver.js &

Now run the tests

npm test 

The Error

If you got this error when testing your javascript app, maybe you hate to update the selenium driver jar.

The Solution

Update the driver depending on the installation of the node module:

Check with

$ which protracto
/usr/local/bin/protractor

If installed global, then use the command

$ /usr/local/lib/node_modules/protractor/bin/webdriver-manager update

If installed in the app directory, use

$ node_modules/protractor/bin/webdriver-manager update
[17:17:13] I/update - chromedriver: file exists node_modules/protractor/node_modules/webdriver-manager/selenium/chromedriver_2.22mac32.zip
[17:17:13] I/update - chromedriver: unzipping chromedriver_2.22mac32.zip
[17:17:14] I/update - chromedriver: setting permissions to 0755 for node_modules/protractor/node_modules/webdriver-manager/selenium/chromedriver_2.22
[17:17:14] I/update - chromedriver: v2.22 up to date
[17:17:14] I/update - selenium standalone: file exists node_modules/protractor/node_modules/webdriver-manager/selenium/selenium-server-standalone-2.53.1.jar
[17:17:14] I/update - selenium standalone: v2.53.1 up to date

Installation

Installing VirtualBox

Install VirtualBox on Windows

Download from here and install as described here.

Install VirtualBox on Linux

$ sudo apt-get install virtualbox

Install VirtualBox on Mac OS

$ brew cask install virtualbox

Install Vagrant

Install Vagrant on Windows

Download from here and install as described here.

Install Vagrant on Linux

$ sudo apt-get install vagrant
$ sudo apt-get install virtualbox-dkms

Install Vagrant on Mac OS

$ brew cask install vagrant
$ brew cask install vagrant-manager
$ brew cask install vagrant-completion

First Steps

Getting vagrant machine up

$ vagrant box add precise32 http://files.vagrantup.com/precise32.box

$ vagrant box add hashicorp/precise64

Configure Project

$ mkdir vagrant_project 
$ cd vagrant_project

Configure Vagrant environment

Running X Clients

Allow X-Forwarding

Vagrant.configure(2) do |config|
   ...
   config.ssh.forward_x11 = true
end

Check ssh config

$ vagrant ssh-config
Host some_site
HostName 127.0.0.1
User vagrant
Port 2222
UserKnownHostsFile /dev/null
StrictHostKeyChecking no
PasswordAuthentication no
IdentityFile vagrant.d/insecure_private_key
IdentitiesOnly yes
LogLevel FATAL
ForwardX11 yes

Run a X client

$ vagrant ssh
vagrant@vagrant: $ sudo apt-get install xclock
vagrant@vagrant: $ exit
$ ssh -X -p 2222 vagrant

@localhost

 xclock

Setup Vagrant box

Setup with on command

$ vagrant init hashicorp/precise64

Setup manuell

$ vagrant init

Edit the Vagrantfile in this directory and replace

config.vm.box = "precise32"

Start Vagrant box

$ vagrant up

Connect using SSH

$ vagrant ssh

Stop working with Vagrant

$ vagrant halt

Destroy the machine

$ vagrant destroy