Docker is a computer program that performs operating-system-level virtualization, also known as "containerization". It was first released in 2013 and is developed by Docker, Inc.
– from Wikipedia

• Hardware Virtualization
  • DOSBox
  • Hyper-V
  • Parallels Desktop for Mac
  • VirtualBox
  • VMware
  • …

• operating-system-level virtualization
  (containerization)
• container exist to run a single application
  (k8s pod ✌)

Mom ! I'm Here ! 👋

• https://www.vagrantup.com/

docker run --name jenkins -d -p 8080:8080 -p 50000:50000 -e "TZ=Asia/Taipei" jenkins/jenkins:lts
 
docker run --name mysql -d -p 3306:3306 -e "TZ=Asia/Taipei" -e MYSQL_ROOT_PASSWORD=rootroot mysql:5.7
 
docker run -d -p 5900:5900 -e VNC_PASSWORD=password dorowu/ubuntu-desktop-lxde-vnc
 
docker run -d -p 8080:80 asia.gcr.io/himore-linder-boyainc-02/haon-ottol-mobile:0.1.0-rc11
 
docker run -d -p 8011:8011 -e activeProfiles=test -e "TZ=Asia/Taipei" -e GOOGLE_APPLICATION_CREDENTIALS=/Himore-Linder-Boyainc.json asia.gcr.io/himore-linder-boyainc-02/ottol-api:Slowpoke.1.0.0.201901150330.792851

Change for Deployment

• Standardize Procedure
• Application with Environment
• Build Once, Run Anywhere (java say hello ☕)
• Eazy to Horizontal Expansion by Yourself (aws say hi 💪)
• Base of CI & CD, DevOps, Microservices, Cloud Native, etc.

# Already supported by frameworks or language !?

# Anything Java Ecosystem can't do !?

# Faster, Bigger, Lightweight or Cool(C,B,A) !?

version: "3"

services:
  server:
    image: jetbrains/teamcity-server:2017.2.4
    expose:
      - 8111
    ports:
      - "8111:8111"
    volumes:
      - ./dataDir:/data/teamcity_server/dataDir
    environment:
      - TZ=Asia/Taipei
    networks:
      - default
  agent:
    image: jianminhuang/teamcity-agent:2017.2.4.1
    environment:
      - TZ=Asia/Taipei
      - SERVER_URL=http://server:8111
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
    networks:
      - default
    depends_on:
      - server
  nexus:
    image: sonatype/nexus
    expose:
      - 8081
    ports:
      - "8081:8081"
    volumes:
      - ./nexus-data:/sonatype-work
    networks:
      - default

networks:
  default:

thinking these deploy situation

• ancient times (great respect 🦉)
• single-module, a few instances -> docker
• multi-module, many instances -> docker-compose
• different server -> add reverse proxy (cost 😯)
• face High Availability, Load Balancing issues
• welcome to microservices world (🚀)
• freestyle deploy by yourself (OMG 😧)

2W1H, What, Why, How

• decentralized design
• declarative service model
• scaling & load balancing
• desired state reconciliation
• multi-host networking
• service-side service discovery
• rolling updates
• kubernetes vs docker swarm