how to test if docker is working code example

Example 1: check if docker is running

systemctl status docker

Example 2: how check status docker in ubuntu

sudo systemctl status docker
#(OR)
systemctl status docker.service
# To check the status of Docker whether running or not.

Example 3: how to test if docker is running from boot

#to check if docker is installed run
$ docker --version
#to check if docker is running run command
$ systemctl status docker