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Explore Kong Mesh with the Kubernetes demo app
To start learning how Kong Mesh works, you can download and run a simple demo application that consists of two services:
-
demo-app
: web application that lets you increment a numeric counter -
redis
: data store for the counter
This guide also introduces some of the tools Kong Mesh provides to help you control and monitor traffic, track resource status, and more.
The demo-app
service listens on port 5000. When it starts, it expects to find a zone key in Redis that specifies the name of the datacenter (or cluster) where the Redis instance is running. This name is displayed in the browser.
The zone key is purely static and arbitrary. Different zone values for different Redis instances let you keep track of which Redis instance stores the counter if you manage routes across different zones, clusters, and clouds.
Prerequisites
-
Demo app downloaded from GitHub:
git clone https://github.com/kumahq/kuma-counter-demo.git
Set up and run
Two different YAML files are available:
-
demo.yaml
installs the basic resources -
demo-v2.yaml
installs the frontend service with different colors. This lets you more clearly view routing across multiple versions, for example. gateway.yaml
installs a builtin gateway
-
Install resources in a
kuma-demo
namespace:kubectl apply -f demo.yaml
-
Port forward the service to the namespace on port 5000:
kubectl port-forward svc/demo-app -n kuma-demo 5000:5000
-
In a browser, go to
127.0.0.1:5000
and increment the counter.
Explore the mesh
The demo app includes the kuma.io/sidecar-injection
label enabled on the kuma-demo
namespace. This means that Kong Mesh already knows that it needs to automatically inject a sidecar proxy to every Kubernetes deployment in the default
Mesh resource:
apiVersion: v1
kind: Namespace
metadata:
name: kuma-demo
labels:
kuma.io/sidecar-injection: enabled
You can view the sidecar proxies that are connected to the Kong Mesh control plane:
Enable Mutual TLS and Traffic Permissions
By default, the network is unsecure and not encrypted. We can change this with Kong Mesh by enabling the Mutual TLS policy to provision a dynamic Certificate Authority (CA) on the default
Mesh resource that will automatically assign TLS certificates to our services (more specifically to the injected dataplane proxies running alongside the services).
We can enable Mutual TLS with a builtin
CA backend by executing:
echo "apiVersion: kuma.io/v1alpha1
kind: Mesh
metadata:
name: default
spec:
mtls:
enabledBackend: ca-1
backends:
- name: ca-1
type: builtin" | kubectl apply -f -
Once Mutual TLS has been enabled, Kong Mesh will not allow traffic to flow freely across our services unless we explicitly have a Traffic Permission policy that describes what services can be consumed by other services. By default, a very permissive traffic permission is created.
For the sake of this demo we will delete it:
kubectl delete trafficpermission allow-all-default
You can try to make requests to the demo application at 127.0.0.1:5000/
and you will notice that they will not work.
Now let’s add back the default traffic permission:
echo "apiVersion: kuma.io/v1alpha1
kind: TrafficPermission
mesh: default
metadata:
name: allow-all-default
spec:
sources:
- match:
kuma.io/service: '*'
destinations:
- match:
kuma.io/service: '*'" | kubectl apply -f -
By doing so every request we now make on our demo application at 127.0.0.1:5000/
is not only working again, but it is automatically encrypted and secure.
As usual, you can visualize the Mutual TLS configuration and the Traffic Permission policies we have just applied via the GUI, the HTTP API or
kumactl
.
Builtin gateways
The resources for creating a builtin gateway is included with
kuma-counter-demo
in gateway.yaml
as well:
- a
MeshGateway
that sets up the listeners - a
MeshGatewayRoute
that directs requests to the demo app - a
MeshGatewayInstance
that manages and deploys proxies to serve gateway traffic
Learn more about builtin gateways in the dedicated gateway docs.
Explore Observability features
With kumactl
you can quickly install all observability components (metrics, logs, tracing) with a single command:
kumactl install observability | kubectl apply -f -
Once that is installed you can use different policies to configure each component.
Traffic Metrics
One of the most important policies that Kong Mesh provides out of the box is Traffic Metrics.
With Traffic Metrics we can leverage Prometheus and Grafana to provide powerful dashboards that visualize the overall traffic activity of our application and the status of the service mesh.
We can now go ahead and enable metrics on our Mesh object by executing:
echo "apiVersion: kuma.io/v1alpha1
kind: Mesh
metadata:
name: default
spec:
mtls:
enabledBackend: ca-1
backends:
- name: ca-1
type: builtin
metrics:
enabledBackend: prometheus-1
backends:
- name: prometheus-1
type: prometheus" | kubectl apply -f -
This will enable the prometheus
metrics backend on the default
Mesh and automatically collect metrics for all of our traffic.
Increment the counter to generate traffic. Then you can expose the Grafana dashboard:
kubectl port-forward svc/grafana -n mesh-observability 3000:80
and access the dashboard at 127.0.0.1:3000 with default credentials for both the username (admin
) and the password (admin
).
Kong Mesh automatically installs three dashboard that are ready to use:
-
Kong Mesh Mesh
: to visualize the status of the overall Mesh. -
Kong Mesh Dataplane
: to visualize metrics for a single individual dataplane. -
Kong Mesh Service to Service
: to visualize traffic metrics for our services.
You can now explore the dashboards and see the metrics being populated over time.
Traffic logs and trace
You can check out specific instructions on Traffic Log and Traffic Trace policies in separate documents.
Next steps
- Explore the Policies available to govern and orchestrate your service traffic.
- Read the full documentation to learn about all the capabilities of Kong Mesh.
- Chat with us at the official Kuma Slack for questions or feedback.