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PUT YOUR DOCKER IMAGE ON A DIET
@PFWD @HowToCodeWell
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SELF TAUGHT DOCKER DEV
IF YOU SEE AN IMPROVEMENT
PLEASE LET ME KNOW
WE ARE ALL LEARNING ALL THE TIME
@PFWD @HowToCodeWell
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PHP 7.4 RC 1
SYMFONY 4.3.6
APACHE 2
WEB SERVER
ORIGINAL 1.09GB
AFTER DIET 171 MB
@PFWD @HowToCodeWell
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@PFWD @HowToCodeWell
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WHY | WHAT | HOW
@PFWD @HowToCodeWell
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PETER FISHER BSC MBSC
HOW TO CODE WELL
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@PFWD @HowToCodeWell
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WHY | WHAT | HOW
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SPEED | SECURITY | SANITY | SCALABILITY
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SPEED
THE LIGHTER THE IMAGE
THE FASTER THE DEVELOPMENT
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SPEED
THE LIGHTER THE IMAGE
THE FASTER THE DEPLOYMENT
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SPEED
THE LIGHTER THE IMAGE
THE FASTER THE DISTRIBUTION
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SECURITY
THE SMALLER THE IMAGE
THE SMALLER THE ATTACK SURFACE
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SECURITY
DO NOT BAKE SECURITY CREDS INTO
YOUR IMAGES
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SANITY
THE SMALLER THE IMAGE
THE LESS YOU HAVE TO MAINTAIN
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SANITY
THE SMALLER THE IMAGE
THE MORE CONTROL YOU HAVE
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SANITY
THE SMALLER THE IMAGE
THE QUICKER YOU CAN SPOT PROBLEMS
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SANITY
THE SMALLER THE IMAGE
THE LESS RESPONSIBILITY IT HAS
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SCALEABILITY
THE SMALLER THE IMAGE
THE QUICKER IT CAN INSTALL
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SCALEABILITY
THE SMALLER THE IMAGE
THE QUICKER TO EXPAND
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SCALEABILITY
THE SMALLER THE IMAGE
THE QUICKER TO CONTRACT
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SCALEABILITY
THE SMALLER THE IMAGE
THE QUICKER TO REUSE
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WHY | WHAT | HOW
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WHAT IS THE DIFFERENCE
BETWEEN A DOCKER CONTAINER
AND A VIRTUAL MACHINE?
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VIRTUALIZATION != CONTAINERIZATION
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VIRTUALIZATION = IS A HOUSE
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CONTAINERIZATION = IS A ROOM
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DIFFERENT LEVELS OF ABSTRACTION
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BOTH SOLVE DIFFERENT PROBLEMS
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BOTH SHOULD BE USED DIFFERENTLY
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VIRTUALIZATION
CUSTOM ENVIRONMENT
ALLOCATED RESOURCES
ECOSYSTEM
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CONTAINIZATION
SINGLE PROCESS
SINGLE RESPONSIBILITY
SINGLE PURPOSE
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WHAT IS A DOCKER IMAGE ANYWAY?
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WHAT IS A DOCKER IMAGE ANYWAY?
ANSWER:
A FILE MADE FROM MANY LAYERS WHICH
CREATES A CONTAINER
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CONTAINERS ARE BUILT FROM IMAGES
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WHAT IS A DOCKER IMAGE MADE FROM?
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WHAT IS A DOCKER IMAGE ANYWAY?
ANSWER:
MANY DIFFERENT IMAGES
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WHAT IS A DOCKER FILE?
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WHAT IS A DOCKER FILE?
ANSWER:
A SERIES OF INSTRUCTIONS THAT
BUILD A DOCKER IMAGE
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WHY | WHAT | HOW
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VERSION 1.0.0
1.09 GB
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VERSION 1.0.0
1.09 GB
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26 BUILD STEPS
18 RUN INSTRUCTIONS
VERSION 1.0.0
1.09 GB
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10 BUILD STEPS
VERSION 1.1.0
1.06 GB
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MULTIPLE CONTAINER
RESPONSIBILITIES
VERSION 1.1.0
1.06 GB
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REMOVED MULTIPLE
CONTAINER
REPSONSIBILTES
MYSQL-SERVER
MYSQL-CLIENT
RABBITMQ-SERVER
VERSION 1.2.0
708MB
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DO NOT
VERSION 1.2.0
708MB
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REMOVED
PHP-7.4-*
VERSION 1.3.0
449MB
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WRONG BASE IMAGE
VERSION 1.3.0
449MB
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VERSION 1.4.0
601MB
USE PHP APACHE
BASE IMAGE
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VERSION 1.5.0
485MB
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VERSION 1.6.0
478MB
DON’T INSTALL
RECOMENDED
PACKAGES
—no-install-recommends
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VERSION 1.7.0
444MB
MULTI STAGE
DOCKER BUILD
3 STAGES!
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DEV PACKAGES
SHOULD BE FOR DEV
NOT FOR PROD!
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VERSION 1.8.0
424MB
MULTI STAGE
DOCKER BUILD
5 STAGES!
2 TARGETS
NO DEV PACKAGES IN STAGING
STAGING HAS AUTOLOADER DUMPED
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VERSION 1.9.0
171MB
ALPINE IMAGES
DECOUPLING PHP FROM APACHE
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VERSION 1.9.0
88.5MB
USE PHP FPM
PHP AND APACHE ARE IN 2
CONTAINERS
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VERSION 1.9.0
PHP 88.5MB
APACHE 171MB
ER… HOW?
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VERSION 1.9.0
PHP 88.5MB
APACHE 171MB
PROXY PHP
REQUESTS TO
THE PHP
CONTAINER
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VERSION 1.9.0
PHP 88.5MB
APACHE 171MB
1) USE THE PHP SERVICE NAME
2) NETWORK APACHE AND PHP
3) SHARE THE SITE VOLUME
@PFWD @HowToCodeWell
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VERSION 1.9.0
PHP 88.5MB
APACHE 171MB
1) USE THE PHP SERVICE NAME
2) NETWORK APACHE AND PHP
3) SHARE THE SITE VOLUME
@PFWD @HowToCodeWell
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Version Size
1.0.0 1.0.9 GB
1.1.0 1.0.6 GB Reduced build steps
1.2.0 708 MB Removed other responsibilities
1.3.0 449 MB Removed unknown PHP packages (php7.4-*)
1.4.0 601 MB Changed the base image
1.5.0 485 MB Removed package and composer cache
1.6.0 478 MB Didn’t install recommend packages
1.7.0 444 MB Used Multi Stage Docker Images
1.8.0 424 MB Removed dev composer packages
1.9.0
171 MB - Apache
88 MB - PHP Separated Apache and PHP
@PFWD @HowToCodeWell
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Peter Fisher BSC MBSC
GITHUB
https://github.com/pfwd/how-to-put-
your-docker-image-on-a-diet
Version 1.0.0
$ docker-compose up -d --build
Grab a ☕
@PFWD @HowToCodeWell
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Peter Fisher BSC MBSC
THANK YOU
QUESTIONS?
LET ME KNOW WHAT YOU THINK!
@PFWD @HowToCodeWell