$ curl -fsSL https://get.docker.com/ | sh

安裝成功後
docker version

sudo service docker start

sudo docker run hello-world
Unable to find image 'hello-world:latest' locally
docker: Error response from daemon: Get https://registry-1.docker.io/v2/library/hello-world/manifests/latest: Get https://auth.docker.io/token?scope=repository%3
 
Alibrary%2Fhello-world%3Apull&service=registry.docker.io: read tcp 172.20.30.205:50310->50.17.62.194:443: read: connection reset by peer.

不能從國外下載映象檔案 參考下面連結配置國內映象庫

修改docker檔案
sudo vi /etc/default/docker

DOCKER_OPTS="--registry-mirror=http://yourRegist.m.daocloud.io"
最後
service docker restart

sudo docker run hello-world
Unable to
 
 find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
78445dd45222: Pull complete 
Digest: sha256:7820f4620e6cf3e795643fac2f6b09e7fd0a29e7e5c4eee6aac9ba0bedca158c
Status: Downloaded newer image for hello-world:latest

Hello from Docker!

~$ sudo docker ps -a
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS                      PORTS               NAMES
f6935ce73938        hello-world         "/hello"
 
            52 seconds ago      Exited (0) 50 seconds ago