Install：
安裝完成後需要sudo usermod -aG docker [user]後重新登錄，以非root用戶使用docker。
docker run command時，報docker: Cannot connect to the Docker daemon. Is the docker daemon running on this host？檢查docker是否已啓動，ps -aux | grep docker，若已啓動依然報此錯誤，一般是用戶導致的，可sudo執行，或添加docker用戶。
docker run hello-world
run：創建並運行一個docker container，container是極簡的linux操作系統
hello-world：加載名爲hello-world的image進這個container，image是加載進container的程序
Docker Hub：全球共享docker image庫。
構建image:
mkdir mydocker && cd mydocker
vim Dockerfile
docker build -t docker-whale . # 讀取當前目錄下的Dockerfile，構建名爲docker-whale的image
docker run docker-whale
docker images
# REPOSITORY TAG IMAGE ID CREATED SIZE
# docker-whale latest bd523f778016 About an hour ago 274.5 MB# hello-world latest 94df4f0ce8a4 3 weeks ago 967 B
# docker/whalesay latest 6b362a9f73eb 12 months ago 247 MB
docker tag bd523f778016 [account]/docker/whalesay latest # 用image-id和docker-hub-account和image名稱標記image
docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
# docker-whale latest bd523f778016 About an hour ago 274.5 MB
# yimzncy/docker-whale latest bd523f778016 About an hour ago 274.5 MB
# hello-world latest 94df4f0ce8a4 3 weeks ago 967 B
# docker/whalesay latest 6b362a9f73eb 12 months ago 247 MB
sudo docker login --username=[account] --email=[account]@gmail.com # 登錄docker hub
docker push docker/whalesay # push image
docker rmi -f bd523f778016/docker-whale # 刪除image可用id或name
docker run [account]/docker/whalesay # pull && load image
MORE:
https://docs.docker.com/docker-hub/