Docker - Automatic Deployment for Dummies

Docker
Automatic Deployment For Dummies
Renaud Hoyoux
GIGA - Syst-Mod - Universit´e de Li`ege

Faculty of Applied Sciences
School of engineering and computer science
Program
Program :
What is Docker (and what Docker is not) ?
How to use it ?
How to create its own container ?
Advantages
Drawbacks
22 avril 2015 Docker
Renaud Hoyoux - GIGA - Syst-Mod - Universit´e de Li`ege 2/30

Cytomine Team

Cytomine Team
Rapha¨el Mar´ee
Group Leader

Cytomine Team
Rapha¨el Mar´ee
Group Leader
Lo¨ıc Rollus
Lead Developer

Cytomine Team
Rapha¨el Mar´ee
Group Leader
Lo¨ıc Rollus
Lead Developer
Renaud Hoyoux
Developer

Cytomine Team
Rapha¨el Mar´ee
Group Leader
Lo¨ıc Rollus
Lead Developer
Renaud Hoyoux
Developer
Julien Confetti
Intern

Cytomine Team
Rapha¨el Mar´ee
Group Leader
Lo¨ıc Rollus
Lead Developer
Renaud Hoyoux
Developer
Julien Confetti
Intern
Each of us has its speciality (Python, NodeJS, Groovy, Java8,
Frontend, RabbitMQ, ...).

A pleasure to use
CYTOMINE Install/Deploy
CYTOMINE Web Clients
CYTOMINE Clients
Backbone.jsHtml 5 Javascript AngularJS
JavaPython
Content based
Image retrieval
CYTOMINE Retrieval
CYTOMINE Core
CYTOMINE Ims
REST API HTTP
Object Detection
Cell Classifier
Tissue Detect
Tissue Segment
Annotation Stats
Your app
…
CYTOMINE Apps
Redis Java
Grails Java Hibernate
PostgreSQL MongoDBPostgis
Grails Java
CYTOMINE IIP
CYTOMINE Monitoring
Node.js
MongoDB
File systemGlusterFS
Docker
Cytomine
A rich internet application
for visualization,
collaborative annotation,
and automatic analysis
of large-scale bioimages
www.cytomine.be

... a HUGE mess to deploy
All these technologies used in the following development
environments :
Ubuntu 14.04 LTS
OSX

environments :
Ubuntu 14.04 LTS
OSX
to deploy on these production environments :
Ubuntu 12.04 LTS
Ubuntu 14.04 LTS
Centos 6.6
Centos 7
?

environments :
Ubuntu 14.04 LTS
OSX
to deploy on these production environments :
Ubuntu 12.04 LTS
Ubuntu 14.04 LTS
Centos 6.6
Centos 7
?
⇒ WARNING ! ! ! Problems are coming !

What is Docker

What is Docker
By Wikipedia
Docker is an open-source project that automates the deployment
of applications inside software containers (...) on Linux.
Docker uses resource isolation features of the Linux kernel such as
cgroups and kernel namespaces to allow independent ”containers”
to run within a single Linux instance.

What is Docker
By Wikipedia
Docker is an open-source project that automates the
deployment of applications inside software containers (...) on
Linux.
Docker uses resource isolation features of the Linux kernel such as
cgroups and kernel namespaces to allow independent
”containers” to run within a single Linux instance.

What Docker is not
Diﬀ´erence to a VM
VM Docker
The processes are isolated from one another but not from the host
machine.

How to use
Run a container
I want to try centos

How to use
Run a container
I want to try centos
sudo docker run centos
>> Unable to find image ’centos:latest’ locally
>> centos:latest: The image you are pulling has been
verified
>> 88f9454e60dd: Pull complete
>> 511136ea3c5a: Already exists
>> 5b12ef8fd570: Already exists sudo docker run -it
centos /bin/bash
>> Status: Downloaded newer image for centos:latest
>> FATA[0000] Error response from daemon: No command
specified
sudo docker run centos /bin/bash
sudo docker run -t centos /bin/bash
[root@15a1a295ae56 /]#

How to use
Main commands
-v path:path Volumes mapping

How to use
Main commands
-p port:port Ports binding

How to use
Main commands
--link One way communication

How to use
Main commands
-e Set an environment variable

How to use
Main commands
--name Set name

How to use
Main commands
--name Set name
--privileged

How to use
Example
postgresql : -p 49153:5432
rails : -p 49154:3000 --link postgresql

Create its container
I want my own custom container !

Image and Dockerﬁle
An image is a read-only layer.

We run container based on an image.

A Dockerﬁle is a text document that contains all the
commands you would normally execute manually in order to
build a Docker image.

A Dockerﬁle is a text document that contains all the
commands you would normally execute manually in order to
build a Docker image.
By calling docker build from your terminal, you can have
Docker build your image step by step, executing the
instructions successively.

Example
Redis installation

Example
Redis installation
FROM debian:wheezy
RUN apt−get update && apt−get install −y curl
&& rm −rf /var/lib/apt/ lists /∗
RUN curl −o /usr/local/bin/gosu −SL
”https://github.com/tianon/gosu/releases/download/1.2/gosu−$(dpkg
−−print−architecture)”
&& gpg −−verify /usr/local/bin/gosu.asc && rm /usr/local/bin/gosu.asc
&& chmod +x /usr/local/bin/gosu
ENV REDIS VERSION 2.8.19
ADD docker−entrypoint.sh /entrypoint.sh
ENTRYPOINT [”/entrypoint.sh”]

Example
cd redisTest && docker build -t="cytomine/redis" .
docker run -p 22 --privileged --name geekRedis
-v .:/test/ cytomine/redis

Les oignons c’est bon

First layer :

First layer :
FROM debian:wheezy

First layer :
FROM debian:wheezy
Second layer :

First layer :
FROM debian:wheezy
Second layer :
Third layer :
ENV REDIS VERSION 2.8.19
...

Step 0 : FROM ubuntu:14.04
---> 2103b00b3fdf
Step 1 : MAINTAINER Cytomine Team "support@cytomine.be"
---> Using cache
---> c544207d0347
Step 2 : RUN apt-get install -y openssh-server
---> Using cache
---> e4cefcd52418
...
Step 9 : EXPOSE 22
---> Using cache
---> 3e0d97b94f3e
Successfully built 3e0d97b94f3e
Sending build context to Docker daemon 9.728 kB
Sending build context to Docker daemon

Inheritance

Inheritance
FROM redis
MAINTAINER ”Cytomine Team support@cytomine.be”
...
RUN echo ”deb http://ppa.launchpad.net/webupd8team/java/ubuntu trusty
main” | tee /etc/apt/sources.list .d/webupd8team−java.list
RUN apt−key adv −−keyserver hkp://keyserver.ubuntu.com:80 −−recv−keys
EEA14886
RUN apt−get install −y oracle−java8−installer
ADD deploy.sh /tmp/deploy.sh
RUN chmod +x /tmp/deploy.sh
ENTRYPOINT [”/tmp/deploy.sh”]

Advantages
Fig
Weave
DevOps
Because we love Open Source ;-)

Advantages
Fig

Advantages
Before
docker run -d redis
docker build -t="web" .
docker run -d -p 5000:5000
--link redis:redis
-v .:/code --name web
web
After
web:
build: .
ports:
- "5000:5000"
volumes:
- .:/code
links:
- redis
redis:
image: redis
So long ﬁg ! Welcome to Docker Compose !

Advantages
Weave

Drawbacks
Cache
---> 2103b00b3fdf
---> Using cache
---> c544207d0347
---> Using cache
---> e4cefcd52418
...
The cache is used even if the above command doesn’t run
anymore.

Drawbacks
Cache
---> 2103b00b3fdf
---> Using cache
---> c544207d0347
---> Using cache
---> e4cefcd52418
...
The cache is used even if the above command doesn’t run
anymore.
⇒ Bad surprise during a clean installation.

Drawbacks
No dynamic container linking
if [ $APP1_ENABLED = true ]
then
docker run --link app1
... (plenty lines)
else if [ $APP2_ENABLED = true ]
then
... (plenty lines)
else
...
fi

Drawbacks
No dynamic container linking
if [ $APP1_ENABLED = true ]
then
... (plenty lines)
else if [ $APP2_ENABLED = true ]
then
... (plenty lines)
else
...
fi
:s

Docker used in production
Cytomine Architecture
Diagram :

Devops
My dev’ environment

The end
Thanks !

Docker - Automatic Deployment for Dummies

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