Docker is probably the most talked-about infrastructure technology of the past few years. It’s a container technology for Linux that allows a developer to package up an application with all of the parts it needs. It makes it easier to create, deploy, port and run applications by using containers. In a way, they’re like virtual machines, but unlike vms, rather than creating a whole virtual operating system, Docker allows applications to use the same Linux kernel as the system that they’re running on.
There are actually two versions of Docker and are supported on multiple platforms.
We’ll be installing the Docker CE [Community Edition] on Ubuntu 14.04 here.
The chances are that the Docker installation package available in the official Ubuntu 14.04 repository may not be the latest version. If you want to get the latest version, install Docker from the official Docker repository. To do 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"
Update the package database with the Docker packages from the newly added repo:
$ sudo apt-get update
$ 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 service docker status
Like all Linux services, Docker can be started, stopped and restarted using the following commands.
$ sudo service docker stop $ sudo service start $ sudo service restart