containers, docker and microservices

7/18/2019 Containers, Docker and Microservices

http://slidepdf.com/reader/full/containers-docker-and-microservices 1/61



Containers,Docker, and

Microservice



Jérôme Petazzoni(@jpetazzo)

Grumpy French DevOps- Go away or I will replace you

with a very small shell script

Runs everything in containers- Docker-in-Docker

- !"-in-Docker

- #M-in-Docker

- $org-in-Docker

- %%%



Jérôme Petazzoni(@jpetazzo)

&uilt and scaled dotCloud!''( with )*+ servicesI counted them.- some e/amples0 hosts, nats,

containers, 1uilds, snapshots,

metrics, 1illing, user permissions,in2rastructure management, logs, %%%



outline



Outline

3hy microservices4

3hat5s the challenge4

6ow does Docker help4

Getting started with stacks o2 containers



why

microservic



What is a microservice architectu

&reak 1ig application down into many small

7/ample0 e-commerce- we1 2ront-end

- catalog o2 products

- inventory8stock management

-shipping calculator

- payment processor

- 1illing8invoicing

- recommendation engine

- user pro2iles



Why is this useful?

9se di22erent stacks 2or di22erent services

can 1e seen as 1oth good and 1ad.Replace e%g% re2actor. individual services easervice 1oundary en2orces '!I separation.

Decouples deployment: re;uires less coordin

deploy early, deploy o2ten: more agility.

6elps implementing <e22 &e=os5 >two-pi==a rmany small teams overper2orm a single 1ig

More e22ective >ownership? o2 services



what5s the

challenge4



Issues e ill not a!!ress to!ay

Fast, e22icient R!C calls

-@eroR!C

- Cap5n !roto

- $MAR!C

- (O'!

-

Dnode- R7(B

- ueues like 'M!., 2or long-running8async operations



Issues e ill not a!!ress to!ay

6ow to 1reak application down in small part

-this is not always easy

- try to get help 2rom people who have already done it

- 1ut0 it helps to achieve a 1etter architecture I promise.



Issues e could a!!ress to!ay

Our app is now spread across multiple servic

Bhose services might will. end up on many

(ome o2 those services might will. 1e scale

Conse;uences0- our services will have to discover each other5s location

- we will have to learn a1out load 1alancing



Issues e will a!!ress to!ay

3e5re deploying E microservices instead o2

3e want to 1e a1le to deploy o2ten

O1vious conse;uence0 our deploy process m- it must 1e 2ast

- it must 1e relia1le

-it must 1e automated



how does

Docker hel



the 1ig

picture



"oc#er$s mission

build, ship, and run any application, anywhe



%ay a&ain?

&uild0 package your application in a containe

(hip0 move that container 2rom a machine t

Run0 e/ecute that container i%e% your applic

'ny application0 anything that runs on Ainu/

'nywhere0 local M, cloud instance, 1are m



1uild



"oc#erfile

FROM ubuntu:14.04

MAINTAINER Docker Team <education@docker.

R!N a"t#$et u"dateR!N a"t#$et in%ta&& #' n$in(R!N ec)o *+i, I am in 'our container* -

u%r%)aren$in()tm&inde(.)tm&

/MD n$in(, #$, daemon o223

E56O7E 80



ship



"oc#er 'u

Image name should 1e username8repo

e%g%0 Hpeta==o8we1docker push

docker pull



"oc#er 'u

Image name should 1e username8repo

e%g%0 Hpeta==o8we1docker push

docker pull

It5s magic



run



*ecution is fast an! lightweight

Aet5s look at a 2ew 1enchmarks



+enchmar#, container creation

9 time docker run ubuntu ec)o )e&&o o

)e&&o or&drea& 0m0.;8%

Disk usage0 less than )** k&

Memory usage0 less than )% M&



+enchmar#, infinian!



+enchmar#, oot Open%tac# inst



+enchmar#, memory spee!



-et$s start a fe containers

<ust 2or run% 7h, 2or 2un%



any app

If i -i i ill i "



If it runs on -inu*. it ill run in "

3e1 apps

'!I 1ackendsData1ases (A, "o(A.

&ig data

Message ;ueues

'nd more

If it -i it ill i "



If it runs on -inu*. it ill run in "

Fire2o/-in-Docker

$org-in-Docker!"-in-Docker

Firewall-in-Docker

Docker-in-Docker

#M-in-Docker



anywhere



anywhere

*Limitations may apply

"oc#er has official support for,



"oc#er has official support for,

Intel + 1its /K+L+. code

Recent kernels %K and a1ove.Coming soon0 3indows ContainersI2 you have ;uestions a1out this, ask Micro

/0umors1 say that people also ru



/0umors1 say that people also ru

Intel E 1its

'RM E and + 1itsMI!(

!owerK

Older kernels please don5t.

"ote0 the main issue is that the Docker 6u1 renot arch-aware, and images are not compati1



CONTAINERSThey're stable they said Stack them they said



runningstacks o2containers



2irst steps



2irst steps

Online tutorial in 1rowser, <( 1ased, =ero in

http088www%docker%com8tryit81ootEdocker E M& universal M image.http0881ootEdocker%io8

(cary install script

curl -s(A https088get%docker%com8 N sh3e have ordinary packages too

'nd most clouds have Docker images

3hec#list

http://www.docker.com/tryit/

http://boot2docker.io/

http://boot2docker.io/

http://www.docker.com/tryit/



3hec#list

Install 1ootEdocker

Run your 2irst container echo hello world.

3rite your 2irst Docker2ile

Create your Docker 6u1 account 2ree.

!ush image to Docker 6u1

(etup automated 1uild

Run your 2irst comple/ app with Fig



2i&



2i&

Run your stack with one command0 2i$ u"

Descri1e your stack with one 2ile0 2i$.'m&

7/ample0 run a one node. Mesos cluster- Mesos master

- Mesos slave

-olt 2ramework

ma%ter: ima$e: red=ackme%o%#ma%ter



command: me%o%#ma%ter ##ork>dir?me%o% "ort%: # 00:00

%&ae:

ima$e: red=ackme%o%#%&ae &ink%: # ma%ter:ma%ter command: me%o%#%&ae ##ma%ter?ma%ter:00 ##containerier%?docker o&ume%: # %'%2%c$rou":%'%2%c$rou" # arrundocker.%ock:arrundocker.%ock # u%rbindocker:bindocker

o&t: ima$e: o&to&t &ink%: # ma%ter:ma%ter command: ##ma%ter?ma%ter:00 "ort%: # 8080:8080



?



what5s ne/



4!vance! topics



4!vance! topics

'll Bhings Docker

http0881log%docker%com8Running your own private registryhttps088githu1%com8docker8docker-registry

Containers and securityhttp088www%slideshare%net8Hpeta==o8docker-linu/-containers-l/c-and-se

https088medium%com8ewindisch8on-the-security-o2-containers-Ec+*22

(ervice discoverylook 2or >am1assador pattern?.

Q 'nd more



thank you

;uestions

Woul! 5ou -i#e 6o 7no 8ore?



ou ! ou e o o o e

Get in touch on Freenode

docker docker-dev'sk me tricky ;uestions Heromedocker%com

Get your own Docker 6u1 on prem

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