常常出现这个错误：
docker: Error response from daemon: driver failed programming external connectivity on endpoint lucid_brahmagupta (9deec589c10e0f6b0e53f6f51c592cb4e8a4492438d49108b62b401ce5fa3440): Bind for 0.0.0.0:8529 failed: port is already allocated.
解决办法就是：
sudo systemctl restart docker
