2/8 - 도커/쿠버네티스 활용 컨테이너 개발 3차시 :: 몽구와 함께하는 개발자의 길

2/8 - 도커/쿠버네티스 활용 컨테이너 개발 3차시

Himoonhee 2021. 2. 8. 23:07

2021. 2. 8. 23:07

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$docker container ls -a

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

63f2fcd79969 mysql:5.7 "docker-entrypoint.s…" 2 days ago Exited (255) 2 days ago 0.0.0.0:3306->3306/tcp, 33060/tcp mysql_moon

a6f8afb1b108 mysql:5.7 "docker-entrypoint.s…" 2 days ago Exited (255) 2 days ago 33060/tcp, 0.0.0.0:23306->3306/tcp mysql_client

7bc67a5f15b4 mysql:5.7 "docker-entrypoint.s…" 2 days ago Exited (255) 2 days ago 33060/tcp, 0.0.0.0:13306->3306/tcp mysql

$docker container start 7bc67a5f15b4 a6f8afb1b108

$docker container ls

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

a6f8afb1b108 mysql:5.7 "docker-entrypoint.s…" 2 days ago Up 5 seconds 33060/tcp, 0.0.0.0:23306->3306/tcp mysql_client

7bc67a5f15b4 mysql:5.7 "docker-entrypoint.s…" 2 days ago Up 27 seconds 33060/tcp, 0.0.0.0:13306->3306/tcp mysql

172.17.0.1(gateway) -> 자동 numbering됨

0~65535 범위 내에서 43306 -> 8080(host->container tomcat), 33306 -> 3306(host -> container mysql)

**container tomcat에서 container mysql 접속하기

mysql -h 172.17.0.2(자기자신) -u root -p

**password 확인

$docker container logs [id]

$docker run(pull + create + start)

$docker inspect [id]

splunk (log파일을 분석해주고 적재해줌) 500GB까지 무료

$docker stop 7bc67a5f15b4 a6f8afb1b108

$docker container exec -it 7bc6 /bin/bash

mysql -h127.0.01 -uroot -p

exit

$docker container start 7bc67a5f15b4

$docker container exec -it 7bc6 /bin/bash -c mysql -h127.0.01 -uroot -p

mysql>use databases;

mysql>drop database mydb;

mysql>create database mydb;

mysql>use mydb;

mysql>create table member (id varchar(20), name varchar(20));

mysql>insert into member(id, name) values('admin', 'Administrator');

mysql>select id, name from member;

$docker container exec -it 7bc6 /bin/bash

root@7bc67a5f15b4:/# ls /var/lib/mysql

root@7bc67a5f15b4:/# ls -l /var/lib/mysql

total 188480

-rw-r----- 1 mysql mysql 56 Feb 5 07:38 auto.cnf

-rw------- 1 mysql mysql 1680 Feb 5 07:38 ca-key.pem

-rw-r--r-- 1 mysql mysql 1112 Feb 5 07:38 ca.pem

-rw-r--r-- 1 mysql mysql 1112 Feb 5 07:38 client-cert.pem

-rw------- 1 mysql mysql 1680 Feb 5 07:38 client-key.pem

-rw-r----- 1 mysql mysql 474 Feb 8 00:38 ib_buffer_pool

-rw-r----- 1 mysql mysql 50331648 Feb 8 00:45 ib_logfile0

-rw-r----- 1 mysql mysql 50331648 Feb 5 07:38 ib_logfile1

-rw-r----- 1 mysql mysql 79691776 Feb 8 00:45 ibdata1

-rw-r----- 1 mysql mysql 12582912 Feb 8 00:45 ibtmp1

drwxr-x--- 2 mysql mysql 4096 Feb 5 07:39 mydb

drwxr-x--- 2 mysql mysql 4096 Feb 5 07:38 mysql

drwxr-x--- 2 mysql mysql 4096 Feb 5 07:38 performance_schema

-rw------- 1 mysql mysql 1676 Feb 5 07:38 private_key.pem

-rw-r--r-- 1 mysql mysql 452 Feb 5 07:38 public_key.pem

-rw-r--r-- 1 mysql mysql 1112 Feb 5 07:38 server-cert.pem

-rw------- 1 mysql mysql 1676 Feb 5 07:38 server-key.pem

drwxr-x--- 2 mysql mysql 12288 Feb 5 07:38 sys

root@7bc67a5f15b4:/#cd /var/lib/mysql/mydb

root@7bc67a5f15b4:/#ls -l

total 112

-rw-r----- 1 mysql mysql 65 Feb 5 07:39 db.opt

-rw-r----- 1 mysql mysql 8586 Feb 5 07:39 member.frm

-rw-r----- 1 mysql mysql 98304 Feb 5 07:39 member.ibd

$docker container run -d -p 13306:3306 -e MYSQL_ALLOW_EMPTY_PASSWORD=true --name mysql mysql:5.7

---------------hostPC와 mounting하기------------------

** -v "host위치":"container위치"(/var/lib/mysql) - 절대경로 써주기

$docker container run -d -p 13306:3306 -e MYSQL_ALLOW_EMPTY_PASSWORD=true -v "":"" --name mysql mysql:5.7

$docker container run -d -p 13306:3306 -e MYSQL_ALLOW_EMPTY_PASSWORD=true --volume "":"" --name mysql mysql:5.7

$docker volume ls

$docker system prune

$docker volume prune

$mkdir docker_volume

$cd docker_volume

$docker container run --volume /Users/mhee4/docker_volume:/var/lib/mysql -d -p 13306:3306 -e MYSQL_ALLOW_EMPTY_PASSWORD=true --name mysql mysql:5.7

$docker container exec -it mysql /bin/bash -c mysql -h127.0.0.1 -uroot -p

mysql>create database mydb;

mysql>use mydb;

mysql>create table member(id varchar(20), name varchar(20));

mysql>insert into member(id, name) values('admin', 'Administrator');

mysql>select id, name from member;

$cd mydb

$docker container stop 7394

$docker container rm 7394(지워도 hostPC에 있는 데이터베이스는 남아 있음)

$docker container run --volume /Users/mhee4/docker_volume:/var/lib/mysql -d -p 13306:3306 -e MYSQL_ALLOW_EMPTY_PASSWORD=true --name mysql mysql:5.7

$docker container exec -it mysql /bin/bash -c mysql -h127.0.0.1 -uroot -p

mysql>select id, name from member;

=> 동일 데이터 출력됨

-i : interactive

-t : terminal

-it=> container의 terminal에 접속

image가 존재하는가?
없으면 hub에서 가져옴

$docker rmi(이미지 삭제) = docker image rm

$docker image pull

$⭐️⭐️docker logs

$docker ⭐️container exec

(image, network, volume, container)

$docker exec -it mysql /bin/bash

$docker container prune

Docker 이미지 생성

컨테이너의 상태를 그대로 이미지로 저장

=> 설치+설정+시작

Application file + Dockerfile

Dockerfile(DSL -> domain specific language) : image 정의

이미지 빌드용 DSL(Domain Specific Language)

Dockerfile 작성

1) Dockerfile 생성

$touch Docker file

2) FROM

$gedit Dockerfile

3) 빌드

$docker build -t fromtest:0.0.
$docker images

$mkdir docker_file

$cd docker_file

$code Dockerfile

$docker images

$docker docker image pull ubuntu

REPOSITORY TAG IMAGE ID CREATED SIZE

python latest e32be9a6f71f 6 days ago 885MB

ubuntu 16.04 8185511cd5ad 2 weeks ago 132MB

ubuntu latest f63181f19b2f 2 weeks ago 72.9MB

mysql 5.7 a70d36bc331a 2 weeks ago 449MB

docker/getting-started latest 021a1b85e641 2 months ago 27.6MB

**vs code extensions에서 docker, vscode-docker-syntax 다운받기

#docker_file/Dockerfile

FROM ubuntu:latest

$docker image build --tag fromtest:1.0 . (. = 현재 디렉토리에 있는 도커 파일 명시, -f 파일명 명시해도 됨)

=>image build

$docker image ls (docker images)

REPOSITORY TAG IMAGE ID CREATED SIZE

python latest e32be9a6f71f 6 days ago 885MB

ubuntu 16.04 8185511cd5ad 2 weeks ago 132MB

ubuntu latest f63181f19b2f 2 weeks ago 72.9MB

fromtest 1.0 def6b0094ed7 2 weeks ago 72.9MB

mysql 5.7 a70d36bc331a 2 weeks ago 449MB

docker/getting-started latest 021a1b85e641 2 months ago 27.6MB

$docker container run fromtest:1.0

$docker container ls -a

$docker images

REPOSITORY TAG IMAGE ID CREATED SIZE

python latest e32be9a6f71f 6 days ago 885MB

ubuntu 16.04 8185511cd5ad 2 weeks ago 132MB

fromtest 1.0 def6b0094ed7 2 weeks ago 72.9MB

ubuntu latest f63181f19b2f 2 weeks ago 72.9MB

mysql 5.7 a70d36bc331a 2 weeks ago 449MB

docker/getting-started latest 021a1b85e641 2 months ago 27.6MB

$cp ./Dockerfile ./Dockerfile_fromtest (windows => copy)

#docker_file/Dockerfile

FROM ubuntu:latest

RUN mkdir /mydata
RUN echo "Hello, Docker!"

mhee4@Moonhees-MacBook-Pro docker_file % docker image build --tag runtest:1.0 .

$docker images

REPOSITORY TAG IMAGE ID CREATED SIZE

runtest 1.0 b5acf655dab3 39 seconds ago 72.9MB

python latest e32be9a6f71f 6 days ago 885MB

ubuntu 16.04 8185511cd5ad 2 weeks ago 132MB

ubuntu latest f63181f19b2f 2 weeks ago 72.9MB

fromtest 1.0 def6b0094ed7 2 weeks ago 72.9MB

mysql 5.7 a70d36bc331a 2 weeks ago 449MB

docker/getting-started latest 021a1b85e641 2 months ago 27.6MB

$docker run runtest:1.0 (별게없어서 기동과 동시에 종료됨)

$docker ps -a(all process)

$docker run -it runtest:1.0 (terminal 환경을 사용하겠다.)

root@301ccf91a731:/#

$cp ./Dockerfile ./Dockerfile_runtest

#docker_file/Dockerfile(오류 발생)

FROM ubuntu:latest

ADD test.txt /mydata
RUN mkdir /mydata

$docker image build --tag addtest:1.0 .

=> ERROR [2/3] ADD test.txt /mydata

$code test.txt

#docker_file/test.txt

Hello, Docker!
Hi, there!

$docker image build --tag addtest:1.0 .

=> ERROR [3/3] RUN mkdir /mydata

#docker_file/Dockerfile

FROM ubuntu:latest

RUN mkdir /mydata
ADD test.txt /mydata

$docker image build --tag addtest:1.0 .

$docker run -it addtest:1.0

root@bb83d5c4048e:/# ls -al /mydata

total 12

drwxr-xr-x 1 root root 4096 Feb 8 02:45 .

drwxr-xr-x 1 root root 4096 Feb 8 02:47 ..

-rw-r--r-- 1 root root 25 Feb 8 02:43 test.txt

root@bb83d5c4048e:/# cat /mydata/test.txt

Hello, Docker!

Hi, there!root@bb83d5c4048e:/#

**앞에 했던 명령어를 반복해야 할 때

$docker image build --no-cache=true --tag addtest:1.0 .

#docker_file/Dockerfile

FROM ubuntu:latest

RUN mkdir /mydata
COPY test.txt /mydata/new_test.txt

$docker rmi 7335

$docker system prune(사용안하는 이미지 다 지움)

$docker build -t addtest:1.1 .

$docker images

REPOSITORY TAG IMAGE ID CREATED SIZE

addtest 1.1 46fe5772be74 10 seconds ago 72.9MB

addtest 1.0 16341914ff80 About an hour ago 72.9MB

$docker run -it addtest:1.1

$docker ps(~ing process 확인가능)

root@4465ac059a13:/# ls -al /mydata

total 12

drwxr-xr-x 1 root root 4096 Feb 8 04:21 .

drwxr-xr-x 1 root root 4096 Feb 8 04:22 ..

-rw-r--r-- 1 root root 25 Feb 8 02:43 new_test.txt

**ENTRYPOINT

# df -h -ps -s

$df -f (메모리 용량 확인)

#docker_file/Dockerfile

FROM ubuntu:latest

RUN mkdir /mydata
COPY test.txt /mydata/new_test.txt

CMD ["df", "-h"]

$docker build -t cmdtest:1.0 .

$docker run -it --name cmdtest cmdtest:1.0

Filesystem Size Used Avail Use% Mounted on

overlay 59G 3.1G 53G 6% /

tmpfs 64M 0 64M 0% /dev

tmpfs 996M 0 996M 0% /sys/fs/cgroup

shm 64M 0 64M 0% /dev/shm

/dev/vda1 59G 3.1G 53G 6% /etc/hosts

tmpfs 996M 0 996M 0% /proc/acpi

tmpfs 996M 0 996M 0% /sys/firmware

$docker ps -a(끝난 process list도 같이 볼 수 있다.)

$docker run -it cmdtest:1.0

root@38deb3959746:/# df -h

root@38deb3959746:/# ps -aux

root@38deb3959746:/# ps -aef

root@38deb3959746:/# apt-get update

root@38deb3959746:/# apt-get install iputils-ping

root@38deb3959746:/# ping 127.0.0.1(자기 자신에게 전달)

**another terminal에서 접속해보기

$docker exec -it 38deb3959746 /bin/bash

root@38deb3959746:/# ps -aef

UID PID PPID C STIME TTY TIME CMD

root 1 0 0 04:38 pts/0 00:00:00 /bin/bash

root 310 1 0 04:43 pts/0 00:00:00 ping 127.0.0.1

root 311 0 0 04:43 pts/1 00:00:00 /bin/bash

root 320 311 0 04:44 pts/1 00:00:00 ps -aef

$docker ps -a

$docker inspect 8164d06eef56

"Mounts": [],

"Config": {

"Hostname": "8164d06eef56",

"Domainname": "",

"User": "",

"AttachStdin": true,

"AttachStdout": true,

"AttachStderr": true,

"Tty": true,

"OpenStdin": true,

"StdinOnce": true,

"Env": [

"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"

"Cmd": [

"df",

"-h"

"Image": "cmdtest:1.0",

"Volumes": null,

"WorkingDir": "",

"Entrypoint": null,

"OnBuild": null,

"Labels": {}

$docker container prune

$docker ps -a

#docker_file/Dockerfile 고정적인 값

FROM ubuntu:latest

RUN mkdir /mydata
COPY test.txt /mydata/new_test.txt

ENTRYPOINT ["df", "-h"]

$docker build -t entrypointtest:1.0 .

$docker build --no-cache=true -t entrypointtest:1.0 .

$docker run -it entrypointtest:1.0

$docker ps -a

$docker inspect 577c

"Cmd": null,

"Image": "entrypointtest:1.0",

"Volumes": null,

"WorkingDir": "",

"Entrypoint": [

"df",

"-h"

파라미터로 인해 값이 변경 될 수 있다 => CMD

고정적인 값 => ENTRYPOINT

두개는 같은 역할을 한다

$docker run -it cmdtest:1.0 ps -aef(가변데이터 추가)

$docker ps -a

$docker inspect e6ea

"Cmd": [

"ps",

"-aef"

"Image": "cmdtest:1.0",

"Volumes": null,

"WorkingDir": "",

"Entrypoint": null,

"OnBuild": null,

"Labels": {}

⭐️문제풀기

test.sh 스크립트 파일 생성

파일 내용 <test.sh>

ls
echo "Hello, Docker"

DOCKER IMAGE에 test.sh 파일을 /mydata 디렉토리에 복사
컨테이너 실행시, test.sh 파일을 실행하여 결과를 화면 출력

#docker_file/test.sh

#! /bin/bash

ls
echo "HEllo, Docker"

#docker_file/Dockerfile

FROM ubuntu:latest

RUN mkdir /mydata
COPY test.sh /mydata/test.sh

$docker build -t shelltest:1.0 .

$docker run -it shelltest:1.0

root@0bbdf84b3a03:/# ls -al /mydata

total 12

drwxr-xr-x 1 root root 4096 Feb 8 05:32 .

drwxr-xr-x 1 root root 4096 Feb 8 05:33 ..

-rw-r--r-- 1 root root 38 Feb 8 05:30 test.sh(x:실행권한이 없음)

root@0bbdf84b3a03:/# /mydata/test.sh

bash: /mydata/test.sh: Permission denied

#docker_file/Dockerfile

FROM ubuntu:latest

RUN mkdir /mydata
COPY test.sh /mydata/test.sh

ENTRYPOINT [ "/mydata/test.sh" ]

#docker_file/Dockerfile

FROM ubuntu:latest

RUN mkdir /mydata
COPY test.sh /mydata/test.sh

WORKDIR /mydata
ENTRYPOINT [ "./test.sh" ]

$docker build --no-cache=true -t shelltest:1.0 .

$docker run -it shelltest:1.0

->Permission denied 해결

#docker_file/Dockerfile

FROM ubuntu:latest

RUN mkdir /mydata
COPY test.sh /mydata/test.sh
RUN chmod +x /mydata/test.sh(읽기권한 주기)

WORKDIR /mydata
ENTRYPOINT [ "./test.sh" ]

--✏️Node.js를 실행하는 Dockerfile 작성

hostPC에서 먼저 실행 -> Dockerfile 생성

node-project 폴더 생성
package.json과 index.js 파일 작성
Local 테스트
왼쪽 command 실행
웹 브라우저 http://127.0.0.1:8080

(base) mhee4@Moonhees-MacBook-Pro docker_file % mkdir node_project

$cd node_project

$code .

#node_project/index.js

const express = require('express');
const app = express();
app.get('/', (req, res) => {
    res.send('Hi, there!')
});
app.listen(8080, () => {
    console.log('Listening on port 8080');
})

#node_project/package.json

{
    "scripts": {
        "start": "node index.js"
    },
    "dependencies": {
        "express": "*"
    }
}

$npm install

$npm start

=> 🌟도커 이미지로 만들기(단계별)

base image 결정(linux) ->base image - node:alpine
nodejs 설치(npm 설치)

apt-get install nodejs
yum install nodejs

index.js, package.json 파일 복사
npm install 명령어로 모듈 설치
npm start 명령어로 프로세스 실행

**알파인 리눅스(Alpine Linux)

CentOS 나 Ubuntu 처럼 Main OS 로 사용하지 않고 도커 컨테이너의 OS로 많이 사용한다.

https://www.lesstif.com/docker/alpine-linux-35356819.html

https://alpinelinux.org

index | Alpine Linux

Small. Simple. Secure. Alpine Linux is a security-oriented, lightweight Linux distribution based on musl libc and busybox.

alpinelinux.org

#node_project/Dockerfile

FROM node:alpine

CMD ["node", "--version"]

$docker build -t mynodejs .

$docker run -it mynodejs

v15.8.0

#node_project/Dockerfile

FROM node:alpine

# 현재 디렉토리 바꾸기
WORKDIR /mydata

COPY ./package.json ./package.json
COPY ./index.js ./index.js

RUN npm install

# CMD ["echo", "installed modules"]

$docker build --no-cache=true -t mynodejs . (본래 있던 캐시파일을 지우겠다)

$docker run mynodejs

installed modules

$docker run -it mynodejs (nodejs prompt 시작됨)

$docker run -it mynodejs /bin/bash (terminal 접속하기 위함)

-> 오류 alpinelinux 에는 /bin/bash가 없다

$docker run -it mynodejs /bin/sh (terminal 접속하기 위함)

/mydata # pwd

/mydata # ls -al

/mydata # npm start

**docker run/exec 차이점

run : 새로 container를 만들어서 실행

exec : 실행 중인 container에 명령어 전달

#node_project/Dockerfile

ENTRYPOINT ["npm", "start"]

$docker build -t mynodejs .

$docker system prune

$docker image rm -f (강제삭제)

$docker run mynodejs

> start

> node index.js

Listening on port 8080

=>port forwarding을 시켜야 정상적으로 웹사이트 가동이 된다.

nodejs container의 firewall -> inbound open해놔야 함.

#node_project/Dockerfile

FROM node:alpine

WORKDIR /mydata

COPY ./package.json ./package.json
COPY ./index.js ./index.js

EXPOSE 8080
RUN npm install

ENTRYPOINT ["npm", "start"]

$docker exec -it 177c8155355d

**mysql -> nodejs 접근할때

ubuntu -> root@djfkldfd /# hostname -i

root@djfkldfd /# curl -X GET http://172.17.0.2:8080/

$docker build -t mynodejs .

$docker run -d mynodejs

$docker ps

$docker inspect f61e8

"IPAddress": "172.17.0.2",

**Host PC에서 nodejs 접근할때

-p localhost ip : container ip

$docker run -p 8080:8080 -d mynodejs

**EXPOSE 8080

$docker run -d mynodejs

$docker ps

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

61377e20c828 mynodejs "npm start" 3 seconds ago Up 2 seconds 8080/tcp quizzical_pascal

$docker run -d -p 8080:8080 mynodejs(원래) -> 명확히 기술해주는 것이 좋다.

$docker run -d -P mynodejs (-P : 자동으로 8080과 매칭)

-> 장점 :알아서 포트번호를 지정해줘서 개발자는 운영에 신경쓰지 않아도 된다.

-> 단점 : 재빌드 해야하는 번거로움이 있다. (후에 MSA에서 배움)

$docker ps

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

8b3b3237a290 mynodejs "npm start" 3 seconds ago Up 2 seconds 0.0.0.0:55000->8080/tcp sleepy_yonath

61377e20c828 mynodejs "npm start" About a minute ago Up About a minute 8080/tcp quizzical_pascal

**✏️image -> 내 docker hub에 업로드하기

-우선 컨테이너 다 지우고 image prune

$docker ps -a(아무것도 없어야 함)

$docker images

$docker image tag mynodejs:latest mynodejs:1.0

$docker image tag mynodejs:latest mhee4321/mynodejs:1.0

REPOSITORY TAG IMAGE ID CREATED SIZE

mynodejs 1.0 394f8d8bae45 2 hours ago 224MB

mynodejs latest 394f8d8bae45 2 hours ago 224MB

mhee4321/mynodejs 1.0 394f8d8bae45 2 hours ago 224MB

shelltest 1.0 3f513926794b 3 hours ago 72.9MB

entrypointtest 1.0 266e66594bc1 4 hours ago 72.9MB

addtest 1.1 cf9609dcf140 4 hours ago 72.9MB

cmdtest 1.0 86aeec3a829e 4 hours ago 72.9MB

addtest 1.0 16341914ff80 5 hours ago 72.9MB

runtest 1.0 b5acf655dab3 6 hours ago 72.9MB

python latest e32be9a6f71f 6 days ago 885MB

ubuntu 16.04 8185511cd5ad 2 weeks ago 132MB

ubuntu latest f63181f19b2f 2 weeks ago 72.9MB

fromtest 1.0 def6b0094ed7 2 weeks ago 72.9MB

mysql 5.7 a70d36bc331a 2 weeks ago 449MB

docker/getting-started latest 021a1b85e641 2 months ago 27.6MB

$docker login

$docker image push mhee4321/mynodejs:1.0

$docker image rm -f 394f8d8bae45

$docker image pull mhee4321/mynodejs:1.0

$docker run -d -p 8080:8080 mhee4321/mynodejs:1.0

$docker ps

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

9701325e2c38 mhee4321/mynodejs:1.0 "npm start" 8 seconds ago Up 7 seconds 0.0.0.0:8080->8080/tcp lucid_panini

->website 8080 포트에서 확인

**✏️지난번에 만들었던 django project -> image file로 만들기

base image 결정(linux) ->base image

python : python:alpine

django :

scrapy :

#python_project/Dockerfile

FROM python:alpine

CMD ["python", "-V"]

$docker build -t mypython .

$docker run -it mypython

Python 3.9.1

#python_project/test.py

print("Hello, Python!")

#python_project/test.py

import numpy as np
a = np.zeros((2,2))
print(a)

#python_project/Dockerfile

FROM python:alpine

COPY ./test.py /mydata/test.py

CMD ["python", "/mydata/test.py"]

$python test.py

[[0. 0.]

[0. 0.]]

$docker build -t mypython .

$docker run -it mypython

ModuleNotFoundError: No module named 'numpy'

($pip install numpy

$docker run -it mypython /bin/sh

/ # pip install numpy)

$docker system prune

#python_project/Dockerfile

FROM python:alpine

RUN pip install numpy
COPY ./test.py /mydata/test.py

CMD ["python", "/mydata/test.py"]

$docker build -t mypython . =>에러뜸 runtime over

$docker run -it mypython

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