Lab 1.1 Install Docker
======================

.. important:: The following commands need to be **run on all three nodes**
   unless otherwise specified.

#. From the jumpbox open **mRemoteNG** and start a session to each of the
   following servers. The sessions are pre-configured to connect with the
   default user “ubuntu”.

   - kube-master1
   - kube-node1
   - kube-node2

   .. image:: images/MremoteNG.png

#. Once connected via CLI(SSH) to **ALL** three nodes as user `ubuntu` (it's
   the user already setup in the MremoteNG settings), let's elevate to root:

   .. code-block:: bash

      su -

      #When prompted for password enter "default" without the quotes

   Your prompt should change to root@ at the start of the line :

   .. image:: images/rootuser.png

#. Then, to ensure the OS is up to date, run the following command

   .. code-block:: bash

      apt update && apt upgrade -y

   .. note:: This can take a few seconds to several minute depending on demand
      to download the latest updates for the OS.

#. Add the docker repo

   .. code-block:: bash

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

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

#. Install the docker packages

   .. code-block:: bash

      apt update && apt install docker-ce -y

#. Verify docker is up and running

   .. code-block:: bash

      docker run --rm hello-world

   If everything is working properly you should see the following message

   .. image:: images/docker-hello-world-yes.png

.. hint:: If you are not a linux/unix person - don't worry.  What happened
   above is how linux installs and updates software. This is  ALL the ugly
   (under the cover steps to install apps, and in this case Docker on a Linux
   host. Please ask questions as to what really happened, but this is how with
   linux on ubuntu (and many other linux flavors) installs applications.
   Linux uses a term called "package manager", and there are many: like PIP,
   YUM, APT, DPKG, RPM, PACMAN, etc. usually one is more favored by the flavor
   of linux (i.e. debian, ubuntu, redhat, gentoo, OpenSuse, etc.), but at the
   end of the day they all pretty much do the same thing, download and keep
   applications updated.