When I want to check if a service is running, in my case if docker service is running, I typed:
sudo status docker
And as output I've got:
status: Unable to connect to Upstart: Failed to connect to socket /com/ubuntu/upstart: Connection refused
What am I doing wrong?
The error message means your Ubuntu is not using Upstart.
From Ubuntu 15.04, systemd is now the default init process instead of Upstart, and as a result some commands have changed.
With systemd, you can instead check the status of, for example, docker with the command:
service docker status
