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Docker

• http://docker.io
• Build, Ship, Run
• 개발자와 시스템어드민을 위한 분산 애플리케이션용 오픈 플랫폼

Install

• https://hub.docker.com/ id 생성
• Docker.dmg 엔진 다운받아 복사 후 실행 (login 필요)
  • https://www.docker.com/community-edition#/download

Basic keywords

docker ps
docker info
docker images
docker version

• docker run hello-world
  • docker : 시스템에 있는 docker 사용
  • run : 서브명령, 컨테이너 실행
  • hello-world : 컨테이너에 실을 이미지 이름
• 컨테이너는 아무것도 꾸미지 않은 버전의 리눅스 운영체제
• 고래가라사대
  • docker hub 이미지 정보
    • 포함한 소프트웨어 종류와 사용법
  • 우분투 OS
• docker run -d -p 80:80 --name webserver nginx
• stop

➜  ~ docker ps
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                         NAMES
92d58318f84e        nginx               "nginx -g 'daemon off"   27 hours ago        Up 27 hours         0.0.0.0:80->80/tcp, 443/tcp   webserver
0235bd537f03        nginx               "nginx -g 'daemon off"   27 hours ago        Up 27 hours         80/tcp, 443/tcp               boring_hypatia
➜  ~ docker stop nginx
Error response from daemon: No such container: nginx
➜  ~ docker stop 92d58318f84e
92d58318f84e

실행중인 도커 접속

docker exec -it  92d58318f84e /bin/bash

이미지 불러오기

• docker pull imagename

컨테이너 전체 삭제

docker stop $(docker ps -aq)
docker rm $(docker ps -aq)

이미지 만들기

• https://docs.docker.com/get-started/part2/
• Dockerfile

# Use an official Python runtime as a parent image
FROM python:2.7-slim

# Set the working directory to /app
WORKDIR /app

# Copy the current directory contents into the container at /app
ADD . /app

# Install any needed packages specified in requirements.txt
RUN pip install --trusted-host pypi.python.org -r requirements.txt

# Make port 80 available to the world outside this container
EXPOSE 80

# Define environment variable
ENV NAME World

# Run app.py when the container launches
CMD ["python", "app.py"]

• requirements.txt

Flask
Redis

• app.py

from flask import Flask
from redis import Redis, RedisError
import os
import socket

# Connect to Redis
redis = Redis(host="redis", db=0, socket_connect_timeout=2, socket_timeout=2)

app = Flask(__name__)

@app.route("/")
def hello():
    try:
        visits = redis.incr("counter")
    except RedisError:
        visits = "<i>cannot connect to Redis, counter disabled</i>"

    html = "<h3>Hello {name}!</h3>" \
           "<b>Hostname:</b> {hostname}<br/>" \
           "<b>Visits:</b> {visits}"
    return html.format(name=os.getenv("NAME", "world"), hostname=socket.gethostname(), visits=visits)

if __name__ == "__main__":
    app.run(host='0.0.0.0', port=80)

• docker build -t friendlyhello .
• docker run -p 4000:80 friendlyhello
• curl localhost:4000
• docker tag friendlyhello kenu/get-started:part2

이미지 업로드

• docker push kenu/get-started:part2

원격 이미지 로컬에서 실행

• docker run -p 4000:80 kenu/get-started:part2
• curl localhost:4000

업로드 이미지 삭제

export USERNAME=myuser
export PASSWORD=mypass
export ORGANIZATION=myorg (if it's personal, then it's your username)
export REPOSITORY=myrepo
export TAG=latest

curl -u $USERNAME:$PASSWORD -X "DELETE" https://cloud.docker.com/v2/repositories/$ORGANIZATION/$REPOSITORY/tags/$TAG/

네트워크

• https://docs.docker.com/engine/tutorials/networkingcontainers/

AWS EC2

• docker 설치

sudo yum update -y
sudo yum install docker -y
sudo service docker start
sudo usermod -a -G docker ec2-user
# for ec2-user permission
sudo reboot

docker ps

• docker-compose 설치
  • https://docs.docker.com/compose/install/

Cases

• copy file
  • docker cp d362659da5fc:/opt/app/app.log .
    • d362659da5fc: container id

참고

• Docker 창시자 발표 https://youtu.be/Q5POuMHxW-0

docker ps
docker images
docker images ubuntu
docker run -i -t ubuntu:12.10 /bin/bash

ps faxw
ls
rm -rf /var /usr /lib
ls /var
exit

ssh dockerdev
sudo -s
docker ps
docker diff 7b882b11bc8e
docker commit 7b882b11bc8e shykes/broken-ubuntu
docker run -i -t shykes/broken-ubuntu /bin/bash

docker push shykes/broken-ubuntu
https://index.docker.io

related

• docker compose
• docker mysql

ref

• How to remove docker images containers and volumes
  • https://www.digitalocean.com/community/tutorials/how-to-remove-docker-images-containers-and-volumes
• Docker in 12 minutes
  • https://www.youtube.com/watch?v=YFl2mCHdv24
• Getting Started for non-technical
  • https://docs.docker.com/mac/
  • https://docs.docker.com/docker-for-windows/
• https://docs.docker.com/mac/step_three/
• docker/whalesay
  • https://hub.docker.com/r/docker/whalesay/
• docker for mac
  • https://pilsniak.com/how-to-install-docker-on-mac-os-using-brew/

deprecated

• Docker Toolbox 다운로드
• https://www.docker.com/products/docker-toolbox
• docker quick start terminal 실행

brew install docker docker-compose docker-machine xhyve docker-machine-driver-xhyve
sudo chown root:wheel /usr/local/opt/docker-machine-driver-xhyve/bin/docker-machine-driver-xhyve
sudo chmod u+s /usr/local/opt/docker-machine-driver-xhyve/bin/docker-machine-driver-xhyve
sudo chown root:wheel $(brew --prefix)/opt/docker-machine-driver-xhyve/bin/docker-machine-driver-xhyve\nsudo chmod u+s $(brew --prefix)/opt/docker-machine-driver-xhyve/bin/docker-machine-driver-xhyve
docker-machine create default --driver xhyve --xhyve-experimental-nfs-share
eval $(docker-machine env default)
docker run hello-world

What Else?