Install Docker on Linux

Installing Docker on Linux

1. If you are running Linux you will need to install Docker directly. You should be logged in as a user with sudo privileges. First, you will need to ensure that you have the command line utility cURL. Do this by opening a terminal and typing:

$ which curl

If cURL is not installed, update your package manager and install it, using:

$ sudo apt-get update
$ sudo apt-get install curl

2. Now that you have cURL, you can use it to get the latest Docker package:

$ curl -fsSL https://get.docker.com/ | sh

3. Add your account to the docker group.

sudo usermod -aG docker <your_username>

This step is required to be able to run Docker commands as a non-root user. You will have to log out and log back in for the change to take effect.

4. Now you should have Docker! Verify that it is installed by running the hello-world container:

$ docker run hello-world
 
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
b901d36b6f2f: Pull complete 
0a6ba66e537a: Pull complete 
Digest: sha256:8be990ef2aeb16dbcb9271ddfe2610fa6658d13f6dfb8bc72074cc1ca36966a7
Status: Downloaded newer image for hello-world:latest


Hello from Docker.

This message shows that your installation appears to be working correctly.

📘

Tip

If you see the message "Cannot connect to the Docker daemon", you may need to restart the Docker service.

$ sudo service docker restart

You can see a list of common Docker commands here.