[docker 설치]
1. sudo yum install -y yum-utils
2. sudo yum install docker-ce docker-ce-cli containerd.io
3. sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

docker -v : 버전 나오면 설치완료

docker image ls 리스트

- 서비스 등록
sudo systemctl enable docker
sudo systemctl start docker

sudo systemctl start docker
sudo docker run hello-world

sudo systemctl start docker
sudo docker run hello-world
docker restart mariadb
docker stop mariadb
docker start mariadb
docker kill mariadb


sudo yum install docker-ce-<VERSION_STRING> docker-ce-cli-<VERSION_STRING> containerd.io


docker pull mariadb <= 다운로드 (https://hub.docker.com/_/mariadb)
docker run -it --network some-network --rm mariadb mysql -hsome-mariadb -uexample-user -phodi11
docker stop mariadb

[서비스 올리기]
$docker run --name=mariadb -d -p 3306:3306 -e MYSQL_ROOT_PASSWORD=[비밀번호] --restart=always mariadb

[백업]
sudo docker save -o mariadb_2020-12-14.tar mariadb:0.5

[복원]
sudo docker load < mariadb_2020-12-14.tar

[동작중인 컨테이너 확인]
$docker ps

[컨테이너 삭제]
$docker rm [컨테이너 id]

[컨테이너 이미지 삭제]
$docker rmi -f [이미지 i]


[삭제된 것 확인]
$docker ps -a

[컨테이너 백업]
docker commit -p 0805346d22fc ~/mariadb_cont1 : 이미지 생성
docker save -o ~/mariadb_cont1.tar  mariadb_cont1 : tar 파일 저장
ls -l ~/mariadb_cont1.tar