[Docker-Compose]修復「ERROR: Couldn't connect to Docker daemon at http+docker://localhost - is it running?」

最近接咗個project係docker image嚟，方便deploy。係Manjaro安裝只需透過pacman：

sudo pacman -Syu docker-compose

跟住前往個docker-compose.yml個folder，執行：

docker-compose up

跟住就出Error：

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

If it's at a non-standard location, specify the URL with the DOCKER_HOST environment variable.

呢個原因多如銀河星星，最簡單就係加sudo：

sudo docker-compose up

或者係docker serivce無開：

systemctl start docker

跟住試下重開：

systemctl restart docker

唔得嘅話呢，另一個可能係個user唔係docker呢個usergroup入面，加入之並重新開機：

sudo usermod -aG docker $USER
reboot

我ok啦。