INSTALLING DOCKER ON UBUNTU 16.X LTS

The Docker installation package available in the official Ubuntu 16.04 repository may not be the latest version. To get the latest and greatest version, install Docker from the official Docker repository. This section shows you how to do just that.

First, add the GPG key for the official Docker repository to the system:

 curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add - 

Add the Docker repository to APT sources:

 sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable" 

Next, update the package database with the Docker packages from the newly added repo:

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sudo apt-get update 

Make sure you are about to install from the Docker repo instead of the default Ubuntu 16.04 repo:

 apt-cache policy docker-ce 

You should see output similar to the follow:

Output of apt-cache policy docker-ce

docker-ce: Installed: (none) Candidate: 17.03.1~ce-0~ubuntu-xenial Version table: 17.03.1~ce-0~ubuntu-xenial 500 500 https://download.docker.com/linux/ubuntu xenial/stable amd64 Packages 17.03.0~ce-0~ubuntu-xenial 500 500 https://download.docker.com/linux/ubuntu xenial/stable amd64 Packages 

Notice that docker-ce is not installed, but the candidate for installation is from the Docker repository for Ubuntu 16.04. The docker-ce version number might be different.

Finally, install Docker:

 sudo apt-get install -y docker-ce 

Docker should now be installed, the daemon started, and the process enabled to start on boot. Check that it's running:

 sudo systemctl status docker 

The output should be similar to the following, showing that the service is active and running:

Output

● docker.service - Docker Application Container Engine Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled) Active: active (running)since Sun 2016-05-01 06:53:52 CDT; 1 weeks 3 days ago Docs: https://docs.docker.com Main PID: 749 (docker) 

Thursday, August 10, 2015 - by Mutasem Elayyoub.