ERROR: Couldn't connect to Docker daemon at http+docker://localhost - is it running?  

$ sudo docker-compose up ， 要用sudo开头，输入密码

其它解释（用了，不行）

答案：主要原因是docker不是系统服务方式启动。

 

 参考地址：ERROR: Couldn't connect to Docker daemon at http+docker://localhost - is it running?_fishinhouse的专栏-CSDN博客