Docker + Flask 튜토리얼

Docker

Docker 공식 로고

1. 사전 준비

Docker, WSL2 (윈도우를 위한 Linux 시스템)

WSL 2

아래 flask-app.zip 압축 해제한다.

flask-app.zip

0.00MB

2. DockerFile

우선 DockerFile 구조를 한 번 살펴보겠다.

FROM python:3

# set a directory for the app
WORKDIR /app

# copy all the files to the container
COPY . .

# install dependencies
RUN pip install --no-cache-dir -r requirements.txt

# tell the port number the container should expose
EXPOSE 5000

# run the command
CMD ["python", "./app.py"]

FROM python:3 : BASE image를 python 3+로 지정

WORKDIR : docker 가상 이미지 안에서 작업할 폴더 app으로 지정

COPY . . : 현재 시스템 폴더에 있는 모든 파일을 컨테이너 안으로 복사하기

RUN : 명령어 실행

EXPOSE : 호스트와 연결할 포트 번호 지정

CMD : 실행할 cmd 명령어 python ./app.py

( ENTRYPOINT : CMD와 다른 점은 docker run를 실행할 때 추가 인자가 CMD로 간다.)

 

3. Docker 실행

docker images

└(도커 모든 이미지 보기)

 

docker container ls

└(도커 컨테이너 이름 표시, docker stop container-id ...)

 

docker build -t test-app .

└( -t 인자 : TTY 모드, bash로 실행하기 위해 필요함, 설정하지 않으면 명령어는 가능하나 셀 표시 안됨)

 

docker run --name=flask -p 8888:5000 test-app

└(flask란 이름으로 컨테이너를 만들고 test 이미지를 실행한다, 8888=외부 포트, 5000=서버 포트)

└(다음부터 실행할 땐 docker start flask)

 

그리고 http://localhost:8888/를 들어가면 아래와 같은 화면이 나온다.

 

Flask 실행 화면

docker stop flask

└(docker restart/stop container-id, 코드 수정하면 재시작하는 걸 추천)

 

4. DockerHub image 업로드

DockerHub에 이미지를 업로드하기 위해선 dockerhub 사이트에 아이디를 만든다.

Docker Hub

docker login

└(docker Hub 아이디와 비밀번호를 입력해서 로그인하기)

 

docker push test-app

└(docker push container-id)

└( ※ 만약 denied: requested access to the resource is denied와 같은 오류가 발생하면,

docker tag test-app dockerHub-ID/test-app

test-app 아이디를 내ID/test-app으로 바꿔준다. 그리고 docker push 내id/test-app )

 

 

그러면 다른 사용자들은 docker pull image로 바로 사용할 수 있다.

docker pull alfex4936/test:latest

└(위 튜토리얼 docker image)

 

##############################################################################
# DOCKER
##############################################################################


docker build -t friendlyname .              # Create image using this directory's Dockerfile
docker run -p 4000:80 friendlyname          # Run "friendlyname" mapping port 4000 to 80
docker run -d -p 4000:80 friendlyname       # Same thing, but in detached mode
docker exec -it [container-id] bash         # Enter a running container
docker ps                                   # See a list of all running containers
docker stop <hash>                          # Gracefully stop the specified container
docker ps -a                                # See a list of all containers, even the ones not running
docker kill <hash>                          # Force shutdown of the specified container
docker rm <hash>                            # Remove the specified container from this machine
docker rm $(docker ps -a -q)                # Remove all containers from this machine
docker images -a                            # Show all images on this machine
docker rmi <imagename>                      # Remove the specified image from this machine
docker rmi $(docker images -q)              # Remove all images from this machine
docker logs <container-id> -f               # Live tail a container's logs
docker login                                # Log in this CLI session using your Docker credentials
docker tag <image> username/repository:tag  # Tag <image> for upload to registry
docker push username/repository:tag         # Upload tagged image to registry
docker run username/repository:tag          # Run image from a registry
docker system prune                         # Remove all unused containers, networks, images (both dangling and unreferenced), and optionally, volumes. (Docker 17.06.1-ce and superior)
docker system prune -a                      # Remove all unused containers, networks, images not just dangling ones (Docker 17.06.1-ce and superior)
docker volume prune                         # Remove all unused local volumes
docker network prune                        # Remove all unused networks


##############################################################################
# DOCKER COMPOSE
##############################################################################


docker-compose up                               # Create and start containers
docker-compose up -d                            # Create and start containers in detached mode
docker-compose down                             # Stop and remove containers, networks, images, and volumes
docker-compose logs                             # View output from containers
docker-compose restart                          # Restart all service
docker-compose pull                             # Pull all image service 
docker-compose build                            # Build all image service
docker-compose config                           # Validate and view the Compose file
docker-compose scale <service_name>=<replica>   # Scale special service(s)
docker-compose top                              # Display the running processes
docker-compose run -rm -p 2022:22 web bash      # Start web service and runs bash as its command, remove old container.

##############################################################################
# DOCKER SERVICES 
##############################################################################


docker service create <options> <image> <command>   # Create new service
docker service inspect --pretty <service_name>      # Display detailed information Service(s)
docker service ls                                   # List Services
docker service ps                                   # List the tasks of Services
docker service scale <service_name>=<replica>       # Scale special service(s)
docker service update <options> <service_name>      # Update Service options


##############################################################################
# DOCKER STACK 
##############################################################################


docker stack ls                                 # List all running applications on this Docker host
docker stack deploy -c <composefile> <appname>  # Run the specified Compose file
docker stack services <appname>                 # List the services associated with an app
docker stack ps <appname>                       # List the running containers associated with an app
docker stack rm <appname>                       # Tear down an application


##############################################################################
# DOCKER MACHINE
##############################################################################


docker-machine create --driver virtualbox myvm1                           # Create a VM (Mac, Win7, Linux)
docker-machine create -d hyperv --hyperv-virtual-switch "myswitch" myvm1  # Win10
docker-machine env myvm1                                                  # View basic information about your node
docker-machine ssh myvm1 "docker node ls"                                 # List the nodes in your swarm
docker-machine ssh myvm1 "docker node inspect <node ID>"                  # Inspect a node
docker-machine ssh myvm1 "docker swarm join-token -q worker"              # View join token
docker-machine ssh myvm1                                                  # Open an SSH session with the VM; type "exit" to end
docker-machine ssh myvm2 "docker swarm leave"                             # Make the worker leave the swarm
docker-machine ssh myvm1 "docker swarm leave -f"                          # Make master leave, kill swarm
docker-machine start myvm1                                                # Start a VM that is currently not running
docker-machine stop $(docker-machine ls -q)                               # Stop all running VMs
docker-machine rm $(docker-machine ls -q)                                 # Delete all VMs and their disk images
docker-machine scp docker-compose.yml myvm1:~                             # Copy file to node's home dir
docker-machine ssh myvm1 "docker stack deploy -c <file> <app>"            # Deploy an app

도커 openface 사용 : https://choiseokwon.tistory.com/157