Deploy a sample application

To play with Istio and demonstrate some of it’s capabilities, you will deploy the example BookInfo application, which is included the Istio package.

What is the Bookinfo Application

The end-to-end architecture of the application is shown in the figure.

Figure: BookInfo deployed off the mesh

As shown in the figure below, proxies are sidecarred to each of the application containers.

kubectl api-versions | grep admissionregistration

If your environment does NOT supports either of these two APIs, then you may use manual sidecar injection to deploy the sample app.

As part of Istio deployment in Previous chapter, you have deployed the sidecar injector.

Deploying Sample App with Automatic sidecar injection

kubectl -n istio-system get configmaps istio-sidecar-injector

Output:

NAME                     DATA   AGE
istio-sidecar-injector   2      9h

NamespaceSelector decides whether to run the webhook on an object based on whether the namespace for that object matches the selector.

kubectl get namespace -L istio-injection

Output:

NAME           STATUS    AGE       ISTIO-INJECTION
default        Active    1h        enabled
istio-system   Active    1h        disabled
kube-public    Active    1h
kube-system    Active    1h

Using Meshery, navigate to the Istio management page.

1. Enter default in the Namespace field.
2. Click the (+) icon on the Sample Application card and select BookInfo Application from the list.

This will do 3 things:

1. Label default namespace for sidecar injection.
2. Deploys all the BookInfo services in the default namespace.
3. Deploys the virtual service and gateway needed to expose the BookInfo’s productpage application in the default namespace.

Verify Bookinfo deployment{" "}

1. Verify that the deployments are all in a state of AVAILABLE before continuing.

watch kubectl get deployment

2. Choose a service, for instance productpage, and view it’s container configuration:

kubectl get po

kubectl describe pod productpage-v1-.....

3. Examine details of the services:

kubectl describe svc productpage

Next, you will expose the BookInfo application to be accessed external from the cluster.

Alternative: Manual installation

Label namespace for injection

Label the default namespace with istio-injection=enabled

kubectl label namespace default istio-injection=enabled

kubectl get namespace -L istio-injection

Output:

NAME           STATUS    AGE       ISTIO-INJECTION
default        Active    1h        enabled
istio-system   Active    1h        disabled
kube-public    Active    1h
kube-system    Active    1h

Deploy BookInfo

Applying this yaml file included in the Istio package you collected in Getting Started will deploy the BookInfo app in you cluster.

kubectl apply -f samples/bookinfo/platform/kube/bookinfo.yaml

Deploy Gateway and Virtual Service for BookInfo app

kubectl apply -f samples/bookinfo/networking/bookinfo-gateway.yaml

Manual Sidecar Injection

Use this only when Automatic Sidecar injection doesn't work

To do a manual sidecar injection we will be using istioctl command:

curl https://raw.githubusercontent.com/istio/istio/master/samples/bookinfo/platform/kube/bookinfo.yaml | istioctl kube-inject -f - > newBookInfo.yaml

Observing the new yaml file reveals that additional container Istio Proxy has been added to the Pods with necessary configurations:

        image: docker.io/istio/proxyv2:1.3.0
        imagePullPolicy: IfNotPresent
        name: istio-proxy

We need to now deploy the new yaml using kubectl

kubectl apply -f newBookInfo.yaml

To do both in a single command:

kubectl apply -f <(curl https://raw.githubusercontent.com/istio/istio/master/samples/bookinfo/platform/kube/bookinfo.yaml | istioctl kube-inject -f -)

Now continue to Verify Bookinfo deployment.