解决 docker中 error：Couldn't connect to Docker daemon at http+docker://localunixsocket - is it running?

安装完docker后执行：

[email protected]1:/vulhub/flask/ssti$ docker-compose up -d

显示

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

正确的是将当前用户加入docker组

[email protected]:/vulhub/nginx/insecure-configuration$ sudo usermod -G docker  toor

然后切换用户，再次切换为回来，然后执行docker-compose up -d