Docker

BWAELS.IO - @baptwaels

Thanks a lot ! :)

It was a great experience.

Thanks a lot ! :)

It was a great experience.

Thanks a lot ! :)

It was a great experience.

You can find me here :

Thanks a lot ! :)

It was a great experience.

You can find me here :

bwaels.io

Thanks a lot ! :)

It was a great experience.

You can find me here :

bwaels.io

@BaptWaels

~ $ company="Decathlon"
~ $ service="Offer & Product Communication"
~ $ jobs=(dev fullstack communityAnimator)
~ $ buzzwordsAboutMyJob=(AngularJS Groovy GitAdvanced beers Bash rpm Docker Jenkins fullstack
python swimming gitHooks springMVC running)

~ $ echo "Hi ! I am" `whoami`
Hi ! I am Baptiste Waels - (ex)CIR - Master 2 - Contrat Pro

~ $ echo "I work for" $company "as a" `echo $jobs`
I work for Decathlon as a dev fullstack devops animator

~ $ echo $buzzwordsAboutMyJob
AngularJS Groovy GitAdvanced beers Bash rpm Docker Jenkins swimming gitHooks springMVC running

`whoami`

What is

What is Docker ?

Docker is an open platform for building, shipping and running distributed applications.

docker.io

What is Docker ?

$15 000 000

$1 000 000 000

Back to THE 90's

MY APP

+

A REAL Server

=

VIRTUAL MACHINEs

REUSABLE IMAGES

VIRTUAL MACHINEs

REUSABLE IMAGES

SNAPSHOTS

VIRTUAL MACHINEs

REUSABLE IMAGES

SNAPSHOTS

SIMPLIFY CLUSTERS CREATION

""too heavy""

Docker containers

Docker

LXC =

OS-level virtualization for running multiple isolated Linux systems

"LINUX CONTAINERS"

cgroups =

Linux kernel feature that limits and isolates the resource usage

(CPU, disk I/O, network, etc.)

"CONTROL GROUPS"

AUFs =

Filesystem which is based on images where every modification is a diff from the previous one (Like commits in git)

"Adv. multi layered Unification FS"

What is the aim of Docker ?

CONF@42 - Docker - MeetUp #25

http://www.dailymotion.com/video/x39cc2t

(7 Octobre 2015)

HOW TO INSTALL ?

http://docs.docker.com/installation

HOW TO INSTALL ?

http://docs.docker.com/installation

Docker HUB

Over 1.2B Pulls

from Docker Hub

5.6M

65 240K

Pulls per Day

Pulls per Second

Repositories on

Docker Hub

Docker Search

~ $ docker search -h
Usage: docker search [OPTIONS] TERM

Search the Docker Hub for images

  --automated=false    Only show automated builds
  --no-trunc=false     Don't truncate output
  -s, --stars=0        Only displays with at least x stars

Docker Search

~ $ docker search hello-world
NAME                                    DESCRIPTION                                     STARS     OFFICIAL   AUTOMATED
hello-world                             Hello World! (an example of minimal Docker...   24        [OK]       
tutum/hello-world                       Image to test docker deployments. Has Apac...   12                   [OK]
marcells/aspnet-hello-world             ASP.NET vNext - Hello World                     1                    [OK]
vegasbrianc/docker-hello-world                                                          1                    [OK]
diegomarangoni/devops-hello-world-app   Example application for deploying using Co...   1                    [OK]
nirmata/hello-world                                                                     0                    [OK]
crccheck/hello-world                    Hello World web server in under 2.5 MB          0                    [OK]
poojathote/hello-world                  this is 3rd POC                                 0                    [OK]
adamkdean/hello-world                                                                   0                    [OK]
davelesser/hello-world                                                                  0                    [OK]
milkyway/java-hello-world               Java Hello World Test Docker Image              0                    [OK]
rcarun/hello-world                                                                      0                    [OK]
suryasumukh/hello-world                 A docker auto build test application            0                    [OK]
sixeyed/coreclr-hello-world             A simple Hello World sample, running as a ...   0                    [OK]
keithchambers/docker-hello-world                                                        0                    [OK]
fermayo/hello-world                                                                     0                    [OK]
craigbarrau/docker-java-hello-world     This is an automated build of docker java-...   0                    [OK]
svlapin/docker-hello-world              Hello world automated build                     0                    [OK]
jaimalchohan/hello-world-node-docker    A simple hello world app                        0                    [OK]

Docker pull

~ $ docker pull -h
Usage: docker pull [OPTIONS] NAME[:TAG] | [REGISTRY_HOST[:REGISTRY_PORT]/]NAME[:TAG]

Pull an image or a repository from the registry

  -a, --all-tags=false          Download all tagged images in the repository
  --disable-content-trust=true  Skip image verification

Docker pull

~ $ docker pull hello-world
latest: Pulling from hello-world

535020c3e8ad: Pull complete 
af340544ed62: Pull complete 
Digest: sha256:a68868bfe696c00866942e8f5ca39e3e31b79c1e50feaee4ce5e28df2f051d5c
Status: Downloaded newer image for hello-world:latest
~ $

RUN Command

~ $ docker run -h
Usage: docker run [OPTIONS] IMAGE [COMMAND] [ARG...]

Run a command in a new container

  -a, --attach=[]               Attach to STDIN, STDOUT or STDERR
  --add-host=[]                 Add a custom host-to-IP mapping (host:ip)
  --blkio-weight=0              Block IO weight (relative weight)
  -c, --cpu-shares=0            CPU shares (relative weight)
  [...]

RUN Command

~ $ docker run ubuntu:latest echo "Docker is awesome"    

Unable to find images 'ubuntu:latest' locally
latest: Pulling from ubuntu

d3a1f33e8a5a: Pull complete 
c22013c84729: Pull complete 
d74508fb6632: Pull complete 
91e54dfb1179: Pull complete 
ubuntu:latest: The image you are pulling has been verified.

Digest: sha256:73fbe2308f5f5cb6e343425831b8ab44f10bbd77070ecdfbe4081daa4dbe3ed1
Status: Downloaded newer image for ubuntu:latest

Docker is awesome
~ $

~ $ docker run -it ubuntu:latest /bin/bash

root@b91b6d0cf193:/# ls
bin  boot  dev  etc  home  lib  lib64  media  mnt  opt  proc  root  run  sbin  srv  sys  tmp  usr  var
root@b91b6d0cf193:/# exit
exit

~ $

RUN Command

~ $ docker run ubuntu:latest echo "Docker is awesome"    

Unable to find images 'ubuntu:latest' locally
latest: Pulling from ubuntu

d3a1f33e8a5a: Pull complete 
c22013c84729: Pull complete 
d74508fb6632: Pull complete 
91e54dfb1179: Pull complete 
ubuntu:latest: The image you are pulling has been verified.

Digest: sha256:73fbe2308f5f5cb6e343425831b8ab44f10bbd77070ecdfbe4081daa4dbe3ed1
Status: Downloaded newer image for ubuntu:latest

Docker is awesome
~ $

images & rmi command

~ $ docker images -h
Usage: docker images [OPTIONS] [REPOSITORY]

List images

  -a, --all=false      Show all images (default hides intermediate images)
  --digests=false      Show digests
  -f, --filter=[]      Filter output based on conditions provided
  --help=false         Print usage
  --no-trunc=false     Don't truncate output
  -q, --quiet=false    Only show numeric IDs

images & rmi command

~ $ docker images
REPOSITORY                             TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
ubuntu                                 latest              91e54dfb1179        16 minutes ago      188.4 MB
hello-world                            latest              af340544ed62        4 minutes ago       960 B

images & rmi command

~ $ docker images
REPOSITORY                             TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
ubuntu                                 latest              91e54dfb1179        16 minutes ago      188.4 MB
hello-world                            latest              af340544ed62        4 minutes ago       960 B

~ $ docker rmi -f hello-world                         
Untagged: hello-world:latest
Deleted: af340544ed62de0680f441c71fa1a80cb084678fed42bae393e543faea3a572c
Deleted: 535020c3e8add9d6bb06e5ac15a261e73d9b213d62fb2c14d752b8e189b2b912
~ $ docker images
REPOSITORY                             TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
ubuntu                                 latest              91e54dfb1179        16 minutes ago      188.4 MB

PS & RM command

~ $ docker ps -h
Usage: docker ps [OPTIONS]

List containers

  -a, --all=false       Show all containers (default shows just running)
  --before=""           Show only container created before Id or Name
  -f, --filter=[]       Filter output based on conditions provided
  -l, --latest=false    Show the latest created container, include non-running
  -n=-1                 Show n last created containers, include non-running
  --no-trunc=false      Don't truncate output
  -q, --quiet=false     Only display numeric IDs
  -s, --size=false      Display total file sizes
  --since=""            Show created since Id or Name, include non-running
  --format=[]       Pretty-print containers using a Go template

PS & RM command

~ $ docker ps
CONTAINER ID    IMAGE               COMMAND                CREATED              STATUS             PORTS      NAMES
89951e446cf0    postgres:latest     "/docker-entrypoint.   8 seconds ago        Up 7 seconds       5432/tcp   pensive        
dd5fe50ab712    ubuntu:latest       "sleep 20000000"       41 seconds ago       Up 40 seconds                 adoring      
eea75a0a071f    ubuntu:latest       "/bin/bash"            About a minute ago   Up About a minute             insane      
~ $

PS & RM command

~ $ docker rm -f 89951e446cf0
89951e446cf0
~ $ docker ps
CONTAINER ID    IMAGE               COMMAND                CREATED              STATUS             PORTS      NAMES
dd5fe50ab712    ubuntu:latest       "sleep 20000000"       41 seconds ago       Up 40 seconds                 adoring      
eea75a0a071f    ubuntu:latest       "/bin/bash"            About a minute ago   Up About a minute             insane      
~ $

~ $ docker ps
CONTAINER ID    IMAGE               COMMAND                CREATED              STATUS             PORTS      NAMES
89951e446cf0    postgres:latest     "/docker-entrypoint.   8 seconds ago        Up 7 seconds       5432/tcp   pensive        
dd5fe50ab712    ubuntu:latest       "sleep 20000000"       41 seconds ago       Up 40 seconds                 adoring      
eea75a0a071f    ubuntu:latest       "/bin/bash"            About a minute ago   Up About a minute             insane      
~ $

exec command

~ $ docker exec -h
Usage: docker exec [OPTIONS] CONTAINER COMMAND [ARG...]

Run a command in a running container

  -d, --detach=false         Detached mode: run command in the background
  -i, --interactive=false    Keep STDIN open even if not attached
  -t, --tty=false            Allocate a pseudo-TTY
  -u, --user=                Username or UID (format: <name|uid>[:<group|gid>])

exec command

~ $ docker ps
CONTAINER ID    IMAGE               COMMAND                CREATED              STATUS             PORTS      NAMES
89951e446cf0    postgres:latest     "/docker-entrypoint.   8 seconds ago        Up 7 seconds       5432/tcp   pensive       
dd5fe50ab712    ubuntu:latest       "sleep 20000000"       41 seconds ago       Up 40 seconds                 adoring      
eea75a0a071f    ubuntu:latest       "/bin/bash"            About a minute ago   Up About a minute             insane      
~ $

exec command

~ $ docker ps
CONTAINER ID    IMAGE               COMMAND                CREATED              STATUS             PORTS      NAMES
89951e446cf0    postgres:latest     "/docker-entrypoint.   8 seconds ago        Up 7 seconds       5432/tcp   pensive       
dd5fe50ab712    ubuntu:latest       "sleep 20000000"       41 seconds ago       Up 40 seconds                 adoring      
eea75a0a071f    ubuntu:latest       "/bin/bash"            About a minute ago   Up About a minute             insane      
~ $

~ $ docker exec -it dd5fe50ab712 /bin/bash
root@dd5fe50ab712:/# ls     
bin  boot  dev  etc  home  lib  lib64  media  mnt  opt  proc  root  run  sbin  srv  sys  tmp  usr  var
root@dd5fe50ab712:/# exit
exit
~ $

Docker Volume

A data volume is a specially-designated directory within one or more containers that bypasses the Union File System.

Docker Volume

~ $ ls /Users/baptou/myDirectory
file1 file2 file3
~ $ docker run -it -v /Users/baptou/myDirectory:/opt ubuntu:latest /bin/bash
root@29088b02f260:/# ls /opt
file1  file2 file3
root@29088b02f260:/# rm /opt/file2
root@29088b02f260:/# ls /opt
file1 file3
root@29088b02f260:/# exit
exit
~ $ ls /Users/baptou/myDirectory  
file1 file3
~ $

Docker COMMIT

~ $ docker commit -h
Usage: docker commit [OPTIONS] CONTAINER [REPOSITORY[:TAG]]

Create a new image from a container's changes

  -a, --author=""     Author (e.g., "John Hannibal Smith <hannibal@a-team.com>")
  -c, --change=[]     Apply specified Dockerfile instructions while committing the image
  -m, --message=""    Commit message
  -p, --pause=true    Pause container during commit

Docker COMMIT

~ $ docker run -d ubuntu /bin/bash -c "apt-get install -y hello"
009e8061df58b8b123ee
~ $ docker commit -m "My first container with a Commit" 009e8061df58b8b123ee baptou/hello
b88f9422f14dc055427d39bf6971f8415511fdaa3182a37869c14c4893664c43
~ $ docker images
REPOSITORY                             TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
baptwaels/hello                        latest              b88f9422f14d        7 seconds ago       189.3 MB
feedbackfront                          latest              34cd8b4a3d8b        4 weeks ago         163 MB
offer/feedbackfront                    latest              63a5a64ddc7a        4 weeks ago         163 MB
offer/feedback-front                   latest              63a5a64ddc7a        4 weeks ago         163 MB

~ $ docker run baptwaels/hello         
Reading package lists...
Building dependency tree...
Reading state information...
hello is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

~ $ docker run -it baptwaels/hello /bin/bash
root@df8d31633a9a:/# hello
Hello, world!
root@df8d31633a9a:/# exit
exit
~ $

Docker push

~ $ docker push -h
Usage: docker push NAME[:TAG]

Push an image or a repository to the registry

--disable-content-trust=true   Skip image signing

Docker push

~ $ docker push baptwaels/hello
The push refers to a repository [baptwaels/hello] (len: 1)
b88f9422f14d: Image push failed 

Please login prior to push:
Username: baptwaels
Password: 
Email: bwaels@gmail.com
WARNING: login credentials saved in /Users/baptou/.dockercfg.
Login Succeeded
The push refers to a repository [baptwaels/hello] (len: 1)
b88f9422f14d: Image already exists 
91e54dfb1179: Image successfully pushed 
d74508fb6632: Image successfully pushed 
c22013c84729: Image successfully pushed 
d3a1f33e8a5a: Image successfully pushed 
Digest: sha256:d659f9011eab6d04b3d9fd9f6324e23505bd1299c52d295c4b04ebe3e58878ce

~ $

Docker push

Dockerfile

A Dockerfile is a text document that contains all the commands a user could call on the command line to assemble an image.

FROM ubuntu:latest

RUN apt-get install hello -y
RUN apt-get install vim -y

Dockerfile

FROM ubuntu:latest

RUN apt-get install hello -y
RUN apt-get install vim -y

Dockerfile

~ $ docker build -t myubuntu .
~ $ docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
myubuntu            latest              4b205af179df        5 seconds ago       188.9 MB

Shell