Red Hat Summit2.2.33.22.6. Cluster-wide deployment
Cluster-wide deployment is a Technology Preview feature only. Technology Preview features are not supported with Red Hat production service level agreements (SLAs) and might not be functionally complete. Red Hat does not recommend using them in production. These features provide early access to upcoming product features, enabling customers to test functionality and provide feedback during the development process.
For more information about the support scope of Red Hat Technology Preview features, see Technology Preview Features Support Scope.
This release introduces cluster-wide deployment as a Technology Preview feature. A cluster-wide deployment contains a Service Mesh Control Plane that monitors resources for an entire cluster. The control plane uses a single query across all namespaces to monitor each Istio or Kubernetes resource kind that affects the mesh configuration. In contrast, the multitenant approach uses a query per namespace for each resource kind. Reducing the number of queries the control plane performs in a cluster-wide deployment improves performance.
This cluster-wide deployment documentation is only applicable for control planes deployed using SMCP v2.3. cluster-wide deployments created using SMCP v2.3 are not compatible with cluster-wide deployments created using SMCP v2.4.
2.2.33.22.6.1. Configuring cluster-wide deployment
The following example ServiceMeshControlPlane object configures a cluster-wide deployment.
To create an SMCP for cluster-wide deployment, a user must belong to the cluster-admin ClusterRole. If the SMCP is configured for cluster-wide deployment, it must be the only SMCP in the cluster. You cannot change the control plane mode from multitenant to cluster-wide (or from cluster-wide to multitenant). If a multitenant control plane already exists, delete it and create a new one.
This example configures the SMCP for cluster-wide deployment.
apiVersion: maistra.io/v2
kind: ServiceMeshControlPlane
metadata:
name: cluster-wide
namespace: istio-system
spec:
version: v2.3
techPreview:
controlPlaneMode: ClusterScoped - 1
- Enables Istiod to monitor resources at the cluster level rather than monitor each individual namespace.
Additionally, the SMMR must also be configured for cluster-wide deployment. This example configures the SMMR for cluster-wide deployment.
apiVersion: maistra.io/v1
kind: ServiceMeshMemberRoll
metadata:
name: default
spec:
members:
- '*' - 1
- Adds all namespaces to the mesh, including any namespaces you subsequently create. The following namespaces are not part of the mesh: kube, openshift, kube-* and openshift-*.
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