Installing XOS

This section described how to deploy XOS. It is a minimal deployment that includes the set of micro-services that make up XOS itself, plus optionally, an example service (a web server running in a Kubernetes pod). For an example of how XOS is integrated into a larger system, see the CORD Installation Guide.

XOS runs on any version of Kubernetes (1.10 or greater), and uses the Helm client-side tool. If you are new to Kubernetes, we recommend this tutorial as a good place to start.

Although you are free to set up Kubernetes and Helm in whatever way makes sense to you, the following walks you through an example installation sequence on MacOS. It was tested on version 10.12.6.

Prerequisites

You need to install Docker. Visit https://docs.docker.com/docker-for-mac/install/ for instructions.

You also need to install VirtualBox. Visit https://www.virtualbox.org/wiki/Downloads for instructions.

The following assumes you've installed the Homebrew package manager. Visit https://brew.sh/ for instructions.

Install Minikube and Kubectl

To install Minikube, run the following command:

curl -Lo minikube https://storage.googleapis.com/minikube/releases/v0.28.0/minikube-darwin-amd64 && chmod +x minikube && sudo mv minikube /usr/local/bin/

To install Kubectl, run the following command:

brew install kubectl

Install Helm and Tiller

The following installs both Helm and Tiller.

brew install kubernetes-helm

Bring Up a Kubernetes Cluster

Start a minikube cluster as follows. This automatically runs inside VirtualBox.

minikube start

To see that it's running, type

kubectl cluster-info

You should see something like the following

Kubernetes master is running at https://192.168.99.100:8443
KubeDNS is running at https://192.168.99.100:8443/api/v1/namespaces/kube-system/services/kube-dns:dn s/proxy

To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.

You can also see how the cluster is configured by looking at ~/.kube/config. Other tools described on this page use this configuration file to find your cluster.

If you want, you can see minikube running by looking at the VirtualBox dashboard. Or alternatively, you can visit the Minikube dashboard:

minikube dashboard

As a final setp, you need to start Tiller on the Kubernetes cluster.

helm init

Download XOS Helm-Charts

The helm charts used to deploy XOS are currently bundled in the CORD helm-chart repository. The rest of this section assumes all you download this repository into directory $SRC_DIR.

mkdir $SRC_DIR
cd $SRC_DIR
git clone https://gerrit.opencord.org/helm-charts
cd helm-charts

While downloading the simple helm-charts repository is sufficient for bringing up XOS, you may also want to download the XOS source code, for example, so you can walk through the XOS tutorial. The easiest way to do this uses the repo tool, as described here.

Bring Up XOS

To deploy xos-core (plus affiliated micro-services) into your Kubernetes cluster, execute the following from the $SRC_DIR/helm-charts directory:

helm dep update xos-core
helm install xos-core -n xos-core

Use kubectl get pods to verify that all containers that implement XOS are successfully running. You should see output that looks something like this:

NAME                                           READY     STATUS    RESTARTS   AGE
xos-chameleon-6f49b67f68-pdf6n                 1/1       Running   0          2m
xos-core-57fd788db-8b97d                       1/1       Running   0          2m
xos-db-f9ddc6589-rtrml                         1/1       Running   0          2m
xos-gui-7fcfcd4474-prhfb                       1/1       Running   0          2m
xos-redis-74c5cdc969-ppd7z                     1/1       Running   0          2m
xos-tosca-7c665f97b6-krp5k                     1/1       Running   0          2m
xos-ws-55d676c696-pxsqk                        1/1       Running   0          2m

Bring Up a Service

Optionally, you can bring up a simple service to be managed by XOS. This involves deploying two additional helm charts: base-kubernetes and demo-simpleexampleservice. Again from the $SRC_DIR/helm-charts directory, execute the following:

helm dep update xos-profiles/base-kubernetes
helm install xos-profiles/base-kubernetes -n base-kubernetes
helm dep update xos-profiles/demo-simpleexampleservice
helm install xos-profiles/demo-simpleexampleservice -n demo-simpleexampleservice

Note: It will take some time for the various helm charts to deploy and the containers to come online. The tosca-loader container may error and retry several times as it waits for services to be dynamically loaded. This is normal, and eventually the tosca-loader will enter the completed state.

As before, when all the containers are successfully up and running, kubectl get pod will return output that looks something like this:

NAME                                           READY     STATUS    RESTARTS   AGE
base-kubernetes-kubernetes-55c55bd897-rn9ln    1/1       Running   0          2m
base-kubernetes-tosca-loader-vs6pv             1/1       Running   1          2m
demo-simpleexampleservice-787454b84b-ckpn2     1/1       Running   0          1m
demo-simpleexampleservice-tosca-loader-4q7zg   1/1       Running   0          1m
xos-chameleon-6f49b67f68-pdf6n                 1/1       Running   0          12m
xos-core-57fd788db-8b97d                       1/1       Running   0          12m
xos-db-f9ddc6589-rtrml                         1/1       Running   0          12m
xos-gui-7fcfcd4474-prhfb                       1/1       Running   0          12m
xos-redis-74c5cdc969-ppd7z                     1/1       Running   0          12m
xos-tosca-7c665f97b6-krp5k                     1/1       Running   0          12m 
xos-ws-55d676c696-pxsqk                        1/1       Running   0          12m

Visit XOS Dashboard

Finally, to view the XOS dashboard, run the following:

minikube service xos-gui

This will launch a window in your default browser. Administrator login and password are defined in $SRC_DIR/helm-charts/xos-core/values.yaml.

Next Steps

This completes the installation process. At this point, you can either drill down on the internals of Simple Example Service, or you can work through the XOS tutorial.

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