root@ubuntu:/data# docker import echo_server < echo_server.tar open echo_server: no such file or directory
cat一下就好了； root@ubuntu:/data# cat echo_server.tar |docker import - echo_server.tar sha256:5111a55b62bf248e1512b7eac6c91b430e2c4c98fe8e08b6ab91f2be669d2ce7
