可能会有特权问题，等命令解决了再说吧。

sudo chown $USER /var/run/docker.sock

感谢Max的解决方案:https://stackoverflow.com/posts/60282354/revisions

尝试先运行dockerd或sudo dockerdif来启动daemon。如果你用sudo启动dockerd，你可能也想用sudo运行docker-compose up。否则也没关系。

工作解决方案https://github.com/docker/compose/issues/4181

我的设置有两个情况下这个错误:

我在容器内运行集成测试后，根用户创建的__pycache__文件对docker(告诉你原始问题)和docker-compose(告诉你关于docker主机含糊不清)是不可访问的; microk8s阻塞了我的端口，直到我停止它。

以下是对我有用的，我不确定是哪一部分起作用了:

julian:project$ sudo service docker status
julian:varys$ sudo service docker status                                                                                                                                                                                
● docker.service - Docker Application Container Engine
   Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled)
   Active: active (running) since Wed 2020-07-15 01:21:16 UTC; 24min ago
     Docs: https://docs.docker.com
 Main PID: 6762 (dockerd)
    Tasks: 25
   CGroup: /system.slice/docker.service
           └─6762 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock

julian:project$ export DOCKER_HOST=unix:///run/containerd/containerd.sock

julian:project$ sudo groupadd docker
groupadd: group 'docker' already exists
julian:project$ sudo gpasswd -a $USER docker
Adding user ubuntu to group docker
julian:project$ newgrp docker

julian:project$ ls -ln /var/run/ | grep docker
drwx------  5   0   0  120 Jul 15 01:10 docker
-rw-r--r--  1   0   0    4 Jul 15 01:10 docker.pid
srw-rw----  1   0 999    0 Jul 15 01:10 docker.sock

julian:project$ sudo rm /var/run/docker.sock                                                                                                                                                                                            
julian:project$ sudo rm /var/run/docker.pid

julian:project$ sudo service docker restart  

尝试使用以下命令重新启动docker环境:

systemctl restart docker

有人查过日志吗?

在我的例子中，/var/log/upstart/docker.log中的错误信息是:

Listening for HTTP on unix (/var/run/docker.sock) 
[graphdriver] using prior storage driver "aufs" 
Running modprobe bridge nf_nat failed with message: , error: exit status 1 
Error starting daemon: Error initializing network controller: Error creating default "bridge" network: can't find an address range for interface "docker0" 

值得一提的是，我打开了vpn，所以: $ sudo service openvpn stop $ sudo service docker restart $ docker-compose |start $ sudo service openvpn start 这就是解决办法。