Missing instructions in ubuntu install from repo

[Kristianwhittick]

Is this a docs issue?

• My issue is about the documentation content or website

Type of issue

Information is incorrect

Description

Missing command in step 3 of section Install using the apt repository, the command is to run the hello world example, but the daemon has not been started.

Command

sudo docker run hello-world`

Output

docker: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?.
See 'docker run --help'.

The command is present in step 6 of Install from a package. Although it does state at the end of section 5 that the daemon will automatically start.

sudo service docker start
sudo docker run hello-world

Location

https://docs.docker.com/engine/install/ubuntu/
https://docs.docker.com/engine/install/debian/

Suggestion

Please add the missing daemon start command to step 3 of section Install using the apt repository,

Also, add the comment to the effect for both section 3 & 6, alternatively the daemon will auto-start on Debian and Ubuntu when the system is rebooted. This comment is present in the "Linux post-installation steps for Docker Engine" page.

On Debian and Ubuntu, the Docker service starts on boot by default.To automatically start Docker and containerd on boot for other Linux distributions using systemd, run the following commands: