Balance to Services Running across Child Clusters With Fleetboard

How to make cross-cluster access to services as simple as in local cluster.

For services in child clusters, we can use service name to visit them locally from any child cluster.

Note

Fleetboard requires no public IP for child clusters and has no pre-limits of cluster IP CIDR or CNI types of kubernetes clusters.
Please install FleetBoard first follow the Fleetboard Helm Docs you should install fleetboard in Hub cluster and install fleetboard-agent in Child clusters.
After the installation, add cross cluster DNS config segment in coredns configmap, and restart coredns pods. The cluster-ip of crossdns is a static cluster IP, usually 10.96.0.11 , check before setting.

  fleetboard.local:53 {
      forward . 10.96.0.11
   }

1. Deploying applications to multiple clusters with various scheduling strategies

Please follow this example. to deploy demo applications to at least two child clusters.

$ kubectl clusternet apply -f examples/scheduling-with-mcs-api/scheduling
namespace/baz created
deployment.apps/nginx-app created
service/nginx-svc created
serviceexport.multicluster.x-k8s.io/nginx-svc created
subscription.apps.clusternet.io/scheduling-with-mcs-api created

2. Testing service availability

Now you can check and verify the endpointslices synced by Fleetboard and the service deployed by clusternet before.

$ kubectl get endpointslice -n syncer-operator
NAME                               ADDRESSTYPE   PORTS   ENDPOINTS                          AGE
cluster1-baz-nginx-svc-v5vw6   IPv4          80      20.112.0.3,20.112.1.5,20.112.1.4   36h
$ kubectl exec -it nginx-app-9fb9fffdd-dsjxm -n baz -c alpine -- sh
/ # curl nginx-svc.baz.svc.fleetboard.local
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
    body {
        width: 35em;
        margin: 0 auto;
        font-family: Tahoma, Verdana, Arial, sans-serif;
    }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>

<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>
</body>
</html>

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Last modified September 23, 2024: change mcs to fleetboard (#96) (c20a9ae)