Docker
Container Technologies
Introduction - Docker
- release of Docker as Open Source Project (2013)
- slogan: “Build, Ship, Run”
- ease of packaging and deploying applications
- focused on usability
- trigger for DevOps movement
Success Stories
Success Stories
- 200+ Dockerized Apps
- Increased infrastructure efficiency by reducing the number of VMs.
- Increased agility and achieved rapid response to evolving customer needs.
-
Achieved more application portability over multiple environments.
Saved time, money and resources.
Success Stories
Docker != Container
user-friendly "Framework" / "Ecosystem" for handling Containers!
- Docker Client:
for interaction with Docker Daemon
shares a UNIX socket with the daemon
- Docker Daemon:
connects to the same UNIX socket as the client
responsible for starting, stopping and monitoring containers
- Docker Hub:
public registry for Docker images
Today? Not only Containers
Technical Stuff
- A software container is very similar to a shipping container
- Simply package a piece of software along with everything that is needed to make it work.
-
Software containers: isolated working environments for an application.
With necessary:- dependencies
- libraries
- binaries
- configurations
Technical Stuff
- Containers depend on an image layer system (reduces duplication, enables reusability & security) --> docker hub registry
- A Container is a Linux process, or many processes, which are running isolated from other processes on the system, using the chroot system call and some Linux kernel features such as cgroups and namespaces.
But why not simply use a VM?
VM vs. Container
VMs
- Virtualize a complete operating system (OS)
- Virtualize the kernel of the host
- Heavyweight
- Suffer from a small overhead as the Machine instructions are translated from Guest to Host OS
- Take a few mins to boot up
- Take much more storage as the whole OS kernel and its associated programs have to be installed and run
Containers
- Virtualize the required file system
- Use/share the kernel of the host
- Lightweight
- Provide near-native performance as compared to the underlying Host OS
- Can be booted up in a few secs as compared to VMs (testing & CI/CD)
- Take a lower amount of storage as the base OS is shared
Technical Stuff
VM
Container
Docker Workflow/Lifecycle
FROM ubuntu:xenial
RUN apt-get update
RUN apt-get install -y nginx php7.0-fpm supervisor && \
rm -rf /var/lib/apt/lists/*
...
docker build -t mysuperimage .
mysuperimage:v2
mysuperimage:v2
Web-Dev & Docker?
Why should Devs know containers?
Web-Dev & Docker?
Demo
Web-Dev & Docker?
- Build, Ship, Run principle
- No more "but this works on my machine" fails
- Test new software really quick
- Sandbox your software --> keep your laptop clean (Spotify in container etc)
- Transition into cloud & CI/CD pipeline ready software!
--> State of the art! --> $
Example 1
Example 1
Live Demo Prisma Setup
version: '3'
services:
prisma:
image: prismagraphql/prisma:1.31
restart: always
ports:
- "4466:4466"
environment:
PRISMA_CONFIG: |
port: 4466
databases:
default:
connector: mysql
host: mysql
user: root
password: prisma
rawAccess: true
port: 3306
migrations: true
mysql:
image: mysql:5.7
restart: always
environment:
MYSQL_ROOT_PASSWORD: prisma
volumes:
- mysql:/var/lib/mysql
volumes:
mysql:Requirements:
- Docker installed
- NPM installed
- CLI :)
To-Do:
$ npm install -g
$
$ prisma init (create new database -> MySQL -> don't generate)
$ docker-compose up -d
$prisma deploy
Example 2
React Setup
Live Demo of:
https://www.peterbe.com/plog/how-to-create-react-app-with-docker
Try it yourself
Copy of Docker
By Axel Forstenhäusler
