Docker

0. Docker 
1. sudo apt-get remove docker docker-engine docker.io containerd runc
2. sudo apt-get update
3. sudo apt-get install \
    apt-transport-https \
    ca-certificates \
    curl \
    gnupg-agent \
    software-properties-common
4. Add Docker’s official GPG key
   : curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
5. sudo apt-key fingerprint 0EBFCD88
        smend@smend-Slave:~$ sudo apt-key fingerprint 0EBFCD88
        pub   rsa4096 2017-02-22 [SCEA]
                  9DC8 5822 9FC7 DD38 854A  E2D8 8D81 803C 0EBF CD88
        uid           [ unknown] Docker Release (CE deb) <docker@docker.com>
        sub   rsa4096 2017-02-22 [S]
6. 
        sudo add-apt-repository \
   "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
   $(lsb_release -cs) \
   stable"
  * --> Raspberry Pi 4 : deb [arch=armhf] https://download.docker.com/linux/raspbian buster stable
7. sudo apt-get update
8. sudo apt-get install docker-ce docker-ce-cli containerd.io
9. sudo usermod -aG docker $USER 그리고 재로그인

Docker 치트 시트 : https://medium.com/@kam6512/%EB%AC%B4%EC%9E%91%EC%A0%95-%ED%95%B4%EB%B3%B4%EB%8A%94-docker-29fa19d8acbc
https://medium.com/@dirty49374/kubeadm%EC%9D%84-%EC%82%AC%EC%9A%A9%ED%95%98%EC%97%AC-kubernetes-%EC%84%A4%EC%B9%98%ED%95%98%EA%B8%B0-ubuntu-18-04-61710f0b4db8 <--- 여기로 설치
docker image prune -a 모두 지우기
docker image prune -f 안쓰는 거 지우기

docker(tomcat) 실행

  docker run -d -i -t --name metafilemanager -p 8080:8080 tomcat-meta:0.1

 01cb13fd8e1090692aff249b79e9ed77bd75f80071c0b6ecb2023cbaeb791dca

Docker image에 들어가기
```
 docker exec -it c6b29002575e /bin/bash
```

도커 이미지 등록

docker commit -m "inital commit" -a "tomcat8_meta_image" tomcat8_meta tomcat8:0.1