How to Dockerize a PHP application
PHP Conference Asia 2016
Kai Hendry
Post lunch tutorial
2.5 hrs of knowledge transfer
1. Intro - ~30mins
2. We do a Docker tutorial together ~1hr
3. We try Dockerize your stuff ~1hr
4. BONUS: AWS ECS zero downtime
Ask me questions at any time!
About me
Docker doings:
So what is Docker?
A defacto standard in the world of containers built by the company dotCloud in
Golang leveraging LXC technology.
What is a container? A running image. Docker has a powerful image layering concept and a push/pull image store.
Why not use LXC? Docker provides a nice user interface.
Is it secure?
What makes Docker a "game changer"?
- Dockerfile for building images
- push/pull layered images
dockerrunupstream/service
PHP tutorial
Overview
Containers are more like bricks
Actually usually you need to compose your containers
- We kept it simple: php-fpm + httpd in one, e.g. abiosoft/caddy:php
- php-fpm linked or composed with a Web server httpd (separate containers)
- php-fpm + mariaDB + httpd more typical
PHP pipeline, i.e. the way you deploy
1. git push
2. travis builds and uploads image to ECR
3. Update docker-compose.yml with image id
4. ecs-cli compose service up
OR
1. docker build -t myapp .
2. docker push myapp:id
3. Update docker-compose.yml with image id
4. ecs-cli compose service up
Tricky sides to Docker
- A lot of (cluster) complexity to wade through or rather just avoid
- No cron
- No fantastic solutions for logging
- Competing container solutions
- Running ontop of Virtualised machines loses some potential benefits
- Requires linux
- Volume mounts
- Housekeeping
- you need a load balancer for vhosting