docker_在ubuntu上安装docker服务

wilker@ubuntu:~$ sudo service docker start [sudo] password for wilker: wilker@ubuntu:~$ docker run hello-world Unable to find image 'hello-world:latest' locally docker: Error response from daemon: Get https:///v2/library/hello-world/manifests/latest: Get https:///token?scope=repository%3Alibrary%2Fhello-world%3Apull&service=.io: net/http: TLS handshake timeout. See 'docker run --help'.