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2. Create the docker group and add yourself to it:
$ sudo groupadd docker
$ sudo usermod -aG docker $USER
You will need to log out and log back in (or reboot) for this change to take effect.
If it worked, you will see docker in your list of groups:
$ groups | grep docker
YOURUSERNAME adm cdrom sudo dip plugdev lpadmin sambashare docker
3. Make sure the Docker daemon is running
Docker runs as a background service (daemon), which must be running for Docker commands to work. You can check using the following:
$ systemctl status docker
● docker.service - Docker Application Container Engine
Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled)
Active: active (running) since Mon 2019-07-15 23:20:46 IST; 18min ago
If the service is not running, you'll see Active: inactive (dead) on
the second line, and will need to enable and start the Docker service
using the following:
$ sudo systemctl unmask docker
$ sudo systemctl enable docker
$ sudo systemctl start docker