Added AIAP doc

Relates-To: #8

Signed-off-by: Pankaj Goyal <pgoyal@att.com>
Change-Id: Id86659fbf756bc20d39958f41016079517683357

doc/source/airship2/airship-in-a-pod.rst

@@ -17,4 +17,162 @@
 Airship in a Pod (AIAP)
 =======================
 
-Coming soon.
+Airship-in-a-Pod (AIAP) is a Kubernetes pod definition that describes all of the components required to deploy a fully functioning Airship 2 in a working Kubernetes cluster. The pod consists of the following "Task" containers:
+
+* airshipctl-builder: This container builds the airshipctl binary and makes it available to the other containers. Airshipctl manages the lifecycle of a site utilizing declarations about the infrastructure (stored in source code).
+* infra-builder: This container creates the various virtual networks and machines required for an Airship deployment.
+* runner: The runner container is the "meat" of the pod, and executes the deployment.
+
+
+The pod also contains the following "Support" containers:
+
+* libvirt: This provides virtualization.
+* sushy-tools: This is used for its Bare Metal Container (BMC) emulator.
+* docker-in-docker: This is used for nesting containers.
+* nginx: This is used for image hosting.
+
+Prerequisites
+------------------
+
+Airship in a Pod (AIAP) is a pod definition. Deploying and using AIAP is as simple as deploying it on any Kubernetes pod on a Linux machine matching the following requirements.
+
+* Linux bare metal server\* with KVM (server recommended specs: CPUs 4, RAM 16G, free disk space 60GB)
+* Kubernetes\**
+* kubectl\**
+* Kubernetes cluster
+
+\* This is our initial AIAP deployment platform. Additional deployment platforms are under consideration for future AIAP installments.
+\** Please note that for compatibility the Kubernetes and kubectl releases should be within 1 release of each other.
+
+Deploying a Kubernetes Cluster
+----------------------------------------
+
+First, we need a working Kubernetes cluster and these can be provided by tools such as `kubeadm <https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/create-cluster-kubeadm/>`_, `minikube <https://minikube.sigs.k8s.io/docs/start/>`_ and `Docker Desktop <https://www.docker.com/products/docker-desktop>`_. The instructions to "Deploy AIAP" using kubectl are agnostic to how the kubernetes cluster is deployed.
+
+In this example we shall utilize minikube to provide us with a Kubernetes cluster; minikube requires that we also deploy the docker-ce engine.
+
+Pre-deploy needed utilites
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. code-block:: bash
+
+	sudo apt-get install  apt-transport-https  \
+		ca-certificates curl  gnupg  lsb-release
+
+Deploy minikube
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Exceute the following in a terminal (cmd or shell) window:
+
+ .. code-block:: bash
+
+	wget https://storage.googleapis.com/minikube/releases/latest/minikube-linux-amd64
+	sudo chmod 755 minikube-linux-amd64
+	sudo mv minikube-linux-amd64 /usr/local/bin/minikube
+
+Deploy Docker
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. code-block:: bash
+
+	sudo apt-get update
+
+Add Docker GPG key
+
+.. code-block:: bash
+
+	curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
+
+Add stable directory
+
+.. code-block:: bash
+
+	sudo add-apt-repository \
+	"deb [arch=amd64] https://download.docker.com/linux/ubuntu \
+	$(lsb_release -cs) stable"
+
+Update package
+
+.. code-block:: bash
+
+	sudo apt update
+	apt-cache policy docker-ce
+
+Install
+
+.. code-block:: bash
+
+	sudo apt-get install docker-ce docker-ce-cli containerd.io
+
+Add Docker User
+
+.. code-block:: bash
+
+ 	sudo usermod -aG docker $USER && newgrp docker
+
+To check Docker status
+
+.. code-block:: bash
+
+	sudo systemctl status docker
+
+Start minikube
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+This will install kubernetes and create a kubernetes "default" cluster.
+
+.. code-block:: bash
+
+	minikube start --cpus=4 --memory=16384 --driver=none
+
+Please note that you can specify a smaller configuration or let minikube utilize the default configuraion by not specifying cpus or memory but, if resources permit, the above specifiction is highly recommended.
+
+Deploy AIAP
+--------------------
+
+The `airship-in-a-pod.yaml <https://github.com/airshipit/airshipctl/blob/master/tools/airship-in-a-pod/airship-in-a-pod.yaml>`_  file contains declarations about the seven (7) containers (listed previously). To deploy AIAP once a kubernetes cluster is available:
+
+.. code-block:: bash
+
+	$ kubectl apply -f https://raw.githubusercontent.com/airshipit/airshipctl/master/tools/airship-in-a-pod/airship-in-a-pod.yaml
+
+You should see the message "airship-in-a-pod" created. The deployment of the containers will take some time.
+
+View Pod Logs
+~~~~~~~~~~~~~~
+
+.. code-block:: bash
+
+	kubectl logs airship-in-a-pod -c $CONTAINER
+
+Usage
+-----------------------------
+
+Interact with the Pod
+~~~~~~~~~~~~~~~~~~~~~
+
+.. code-block:: bash
+
+	kubectl exec -it airship-in-a-pod -c $CONTAINER -- bash
+
+where $CONTAINER is one of the containers listed above.
+
+
+Output
+~~~~~~~~~~~~~~~~~~~~~
+
+Airship-in-a-pod produces the following outputs:
+
+    - The airshipctl repo and associated binary used with the deployment
+    - A tarball containing the generated ephemeral ISO, as well as the configuration used during generation.
+
+These artifacts are placed at ARTIFACTS_DIR (defaults to /opt/aiap-artifacts).
+
+
+Caching
+~~~~~~~~~~~~~~~~~~~~~
+
+As it can be cumbersome and time-consuming to build and rebuild binaries and images, some options are made available for caching. A developer may re-use artifacts from previous runs (or provide their own) by placing them in CACHE_DIR (defaults to /opt/aiap-cache). Special care is needed for the caching:
+
+    - If using a cached airshipctl, the airshipctl binary must be stored in the $CACHE_DIR/airshipctl/bin/ directory, and the developer must have set USE_CACHED_AIRSHIPCTL to true.
+    - If using a cached ephemeral iso, the iso must first be contained in a tarball named iso.tar.gz, must be stored in the $CACHE_DIR/ directory, and the developer must have set USE_CACHED_ISO to true.