xxxxxxxxxx
sudo chmod 666 /var/run/docker.sock
xxxxxxxxxx
# run this
sudo chmod 666 /var/run/docker.sock
xxxxxxxxxx
# just open terminal and type this command
sudo chmod 666 /var/run/docker.sock
xxxxxxxxxx
sudo chmod 666 /var/run/docker.sock
xxxxxxxxxx
$ sudo usermod -aG docker $USER
xxxxxxxxxx
$ sudo usermod -aG docker $USER
$ newgrp docker
xxxxxxxxxx
*OS: Linux, Centos 7
---
sudo usermod -aG docker ${USER}
su -s ${USER}
---
then try again!
xxxxxxxxxx
$ sudo groupadd docker