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Chapter 2. Running OpenShift Service Mesh 2.6 in the same cluster as OpenShift Service Mesh 3

If you are moving from Red Hat OpenShift Service Mesh v2.6, you can run OpenShift Service Mesh v2.6 side-by-side with OpenShift Service Mesh v3.0, in one cluster, without them interfering with each other.

2.1. Running OpenShift Service Mesh 2.6 and OpenShift Service Mesh 3 using multi-tenant deployment model

If you are moving from Red Hat OpenShift Service Mesh 2.6 from the default multi-tenant deployment model, you can run OpenShift Service Mesh 2.6 side-by-side with OpenShift Service Mesh 3.0, in one cluster, without them interfering with each other.

In OpenShift Service Mesh 2.6, you can check your deployment model from the ServiceMeshControlPlane under spec.mode:

Example ServiceMeshControlPlane yaml

apiVersion: maistra.io/v2
kind: ServiceMeshControlPlane
metadata:
  name: basic
spec:
  mode: MultiTenant

Prerequisites

  • You are running OpenShift Container Platform 4.14 or later.

  • You are running OpenShift Service Mesh 2.6.

    Important

    If you are not running OpenShift Service Mesh 2.6, you must upgrade to 2.6 before following this procedure. To upgrade to OpenShift Service Mesh version to 2.6, see: Upgrading Service Mesh 2.x

Procedure

  1. Install the OpenShift Service Mesh 3 Operator.
  2. Create an IstioCNI resource in the istio-cni namespace.

  3. Create an Istio resource in a different namespace than the namespace used in the ServiceMeshControlPlane resource in OpenShift Service Mesh 2.6. In this example, istio-system3 is being used:

    Example Istio resource with istio-system3

    kind: Istio
piVersion: sailoperator.io/v1alpha1
metadata:
  name: ossm3 1
spec:
  namespace: istio-system3 2
  values:
    meshConfig:
      discoverySelectors: 3
        - matchExpressions:
          - key: maistra.io/member-of
            operator: DoesNotExist
  updateStrategy:
    type: InPlace
  version: v1.23.0

    1
    Do not use default as the name.
    2
    Must be different from the namespace used in the ServiceMeshControlPlane resource in OpenShift Service Mesh 2.6.
    3
    To ignore OpenShift Service Mesh 2.6 namespaces, configure the discoverySelectors section as shown. All other namespaces will be part of the OpenShift Service Mesh 3.0 mesh.

  4. Deploy your workloads and label the namespaces with istio.io/rev=ossm3 label by running the following command: 

    $ oc label namespace <namespace-name> istio.io/rev=<revision-name>
    Note

    If you have changed spec.memberSelectors in ServiceMeshMemberRoll in the ServiceMeshControlPlane resource in OpenShift Service Mesh 2.6., then use the istio-injection=enabled label for your OpenShift Service Mesh 3.0 workload namespaces.

  5. Confirm the application workloads are managed by their respective control planes by running the following command: 

    $ istioctl ps -i istio-system

    Sample output istio-system

    $ istioctl ps -i istio-system
NAME                                          CLUSTER        CDS        LDS        EDS        RDS        ECDS         ISTIOD                                          VERSION
details-v1-7f46897b-88x4l.bookinfo            Kubernetes     SYNCED     SYNCED     SYNCED     SYNCED     NOT SENT     istiod-install-istio-system-bd58bdcd5-2htkf     1.20.8
mongodb-v1-6cf7dc9885-7nlmq.bookinfo          Kubernetes     SYNCED     SYNCED     SYNCED     SYNCED     NOT SENT     istiod-install-istio-system-bd58bdcd5-2htkf     1.20.8
mysqldb-v1-7c4c44b9b4-22b57.bookinfo          Kubernetes     SYNCED     SYNCED     SYNCED     SYNCED     NOT SENT     istiod-install-istio-system-bd58bdcd5-2htkf     1.20.8
productpage-v1-6f9c6589cb-l6rvg.bookinfo      Kubernetes     SYNCED     SYNCED     SYNCED     SYNCED     NOT SENT     istiod-install-istio-system-bd58bdcd5-2htkf     1.20.8
ratings-v1-559b64556-f6b4l.bookinfo           Kubernetes     SYNCED     SYNCED     SYNCED     SYNCED     NOT SENT     istiod-install-istio-system-bd58bdcd5-2htkf     1.20.8
ratings-v2-8ddc4d65c-bztrg.bookinfo           Kubernetes     SYNCED     SYNCED     SYNCED     SYNCED     NOT SENT     istiod-install-istio-system-bd58bdcd5-2htkf     1.20.8
ratings-v2-mysql-cbc957476-m5j7w.bookinfo     Kubernetes     SYNCED     SYNCED     SYNCED     SYNCED     NOT SENT     istiod-install-istio-system-bd58bdcd5-2htkf     1.20.8
reviews-v1-847fb7c54d-7dwt7.bookinfo          Kubernetes     SYNCED     SYNCED     SYNCED     SYNCED     NOT SENT     istiod-install-istio-system-bd58bdcd5-2htkf     1.20.8
reviews-v2-5c7ff5b77b-5bpc4.bookinfo          Kubernetes     SYNCED     SYNCED     SYNCED     SYNCED     NOT SENT     istiod-install-istio-system-bd58bdcd5-2htkf     1.20.8
reviews-v3-5c5d764c9b-mk8vn.bookinfo          Kubernetes     SYNCED     SYNCED     SYNCED     SYNCED     NOT SENT     istiod-install-istio-system-bd58bdcd5-2htkf     1.20.8

    Sample output istio-system3

    $ istioctl ps -i istio-system3
NAME                                          CLUSTER        CDS                LDS                EDS                RDS                ECDS        ISTIOD                            VERSION
details-v1-57f6466bdc-5krth.bookinfo2         Kubernetes     SYNCED (2m40s)     SYNCED (2m40s)     SYNCED (2m34s)     SYNCED (2m40s)     IGNORED     istiod-ossm3-5b46b6b8cb-gbjx6     1.23.0
productpage-v1-5b84ccdddf-f8d9t.bookinfo2     Kubernetes     SYNCED (2m39s)     SYNCED (2m39s)     SYNCED (2m34s)     SYNCED (2m39s)     IGNORED     istiod-ossm3-5b46b6b8cb-gbjx6     1.23.0
ratings-v1-fb764cb99-kx2dr.bookinfo2          Kubernetes     SYNCED (2m40s)     SYNCED (2m40s)     SYNCED (2m34s)     SYNCED (2m40s)     IGNORED     istiod-ossm3-5b46b6b8cb-gbjx6     1.23.0
reviews-v1-8bd5549cf-xqqmd.bookinfo2          Kubernetes     SYNCED (2m40s)     SYNCED (2m40s)     SYNCED (2m34s)     SYNCED (2m40s)     IGNORED     istiod-ossm3-5b46b6b8cb-gbjx6     1.23.0
reviews-v2-7f7cc8bf5c-5rvln.bookinfo2         Kubernetes     SYNCED (2m40s)     SYNCED (2m40s)     SYNCED (2m34s)     SYNCED (2m40s)     IGNORED     istiod-ossm3-5b46b6b8cb-gbjx6     1.23.0
reviews-v3-84f674b88c-ftcqg.bookinfo2         Kubernetes     SYNCED (2m40s)     SYNCED (2m40s)     SYNCED (2m34s)     SYNCED (2m40s)     IGNORED     istiod-ossm3-5b46b6b8cb-gbjx6     1.23.0

2.2. Running Red Hat OpenShift Service Mesh 2.6 and Red Hat OpenShift Service Mesh 3 using cluster-wide deployment model

If you are moving from Red Hat OpenShift Service Mesh 2.6 in a cluster-wide deployment model, you can run OpenShift Service Mesh 2.6 side-by-side with OpenShift Service Mesh 3.0, in one cluster, without them interfering with each other.

In OpenShift Service Mesh 2.6, you can check your deployment model from the ServiceMeshControlPlane under spec.mode:

Example ServiceMeshControlPlane yaml

apiVersion: maistra.io/v2
kind: ServiceMeshControlPlane
metadata:
  name: basic
spec:
  mode: ClusterWide

To prevent conflicts with OpenShift Service Mesh 3.0 when using the OpenShift Service Mesh 2.6 cluster-wide deployment model, you need to configure the ServiceMeshControlPlane resource to restrict namespaces to only those belonging to (SMProduct) 2.6.

Prerequisites

  • You are running OpenShift Container Platform 4.14 or later.

  • You are running OpenShift Service Mesh 2.6.

    Important

    If you are not running OpenShift Service Mesh 2.6, you must upgrade to 2.6 before following this procedure. To upgrade to OpenShift Service Mesh version to 2.6, see: Upgrading Service Mesh 2.x

Procedure

  1. Configure discoverySelectors, and set the ENABLE_ENHANCED_RESOURCE_SCOPING environment variable on the pilot container to true in your OpenShift Service Mesh 2.6 ServiceMeshControlPlane custom resource (CR):

    Example ServiceMeshControlPlane CR

    apiVersion: maistra.io/v2
kind: ServiceMeshControlPlane
metadata:
  name: basic
  namespace: istio-system
spec:
  version: v2.6
  mode: ClusterWide
  meshConfig:
    discoverySelectors:
      - matchExpressions:
        - key: maistra.io/member-of
          operator: Exists
  runtime:
    components:
      pilot:
        container:
          env:
            ENABLE_ENHANCED_RESOURCE_SCOPING: 'true'

  2. Install the OpenShift Service Mesh 3 Operator.
  3. Create an IstioCNI resource in the istio-cni namespace.

  4. Create an Istio resource in a different namespace than the namespace used in the ServiceMeshControlPlane resource in OpenShift Service Mesh 2.6. In this example, istio-system3 is being used:

    Example Istio resource with istio-system3

    kind: Istio
apiVersion: sailoperator.io/v1alpha1
metadata:
  name: ossm3 1
spec:
  namespace: istio-system3 2
  values:
    meshConfig:
      discoverySelectors: 3
        - matchExpressions:
          - key: maistra.io/member-of
            operator: DoesNotExist
  updateStrategy:
    type: InPlace
  version: v1.23.0

    1
    Do not use default as the name.
    2
    Must be different from the namespace used in the ServiceMeshControlPlane resource in OpenShift Service Mesh 2.6.
    3
    To ignore OpenShift Service Mesh 2.6 namespaces, configure the discoverySelectors section as shown. All other namespaces will be part of the OpenShift Service Mesh 3.0 mesh.

  5. Deploy your workloads and label the namespaces with istio.io/rev=ossm3 label by running the following command: 

    $ oc label namespace <namespace-name> istio.io/rev=ossm3
    Note

    If you have changed spec.memberSelectors in ServiceMeshMemberRoll in the ServiceMeshControlPlane resource in OpenShift Service Mesh 2.6., then use the istio-injection=enabled label for your OpenShift Service Mesh 3.0 workload namespaces.

  6. Confirm the application workloads are managed by their respective control planes by running the following command: 

    $ istioctl ps -i istio-system

    Sample output istio-system

    $ istioctl ps -i istio-system
NAME                                          CLUSTER        CDS        LDS        EDS        RDS        ECDS         ISTIOD                                          VERSION
details-v1-7f46897b-88x4l.bookinfo            Kubernetes     SYNCED     SYNCED     SYNCED     SYNCED     NOT SENT     istiod-install-istio-system-bd58bdcd5-2htkf     1.20.8
mongodb-v1-6cf7dc9885-7nlmq.bookinfo          Kubernetes     SYNCED     SYNCED     SYNCED     SYNCED     NOT SENT     istiod-install-istio-system-bd58bdcd5-2htkf     1.20.8
mysqldb-v1-7c4c44b9b4-22b57.bookinfo          Kubernetes     SYNCED     SYNCED     SYNCED     SYNCED     NOT SENT     istiod-install-istio-system-bd58bdcd5-2htkf     1.20.8
productpage-v1-6f9c6589cb-l6rvg.bookinfo      Kubernetes     SYNCED     SYNCED     SYNCED     SYNCED     NOT SENT     istiod-install-istio-system-bd58bdcd5-2htkf     1.20.8
ratings-v1-559b64556-f6b4l.bookinfo           Kubernetes     SYNCED     SYNCED     SYNCED     SYNCED     NOT SENT     istiod-install-istio-system-bd58bdcd5-2htkf     1.20.8
ratings-v2-8ddc4d65c-bztrg.bookinfo           Kubernetes     SYNCED     SYNCED     SYNCED     SYNCED     NOT SENT     istiod-install-istio-system-bd58bdcd5-2htkf     1.20.8
ratings-v2-mysql-cbc957476-m5j7w.bookinfo     Kubernetes     SYNCED     SYNCED     SYNCED     SYNCED     NOT SENT     istiod-install-istio-system-bd58bdcd5-2htkf     1.20.8
reviews-v1-847fb7c54d-7dwt7.bookinfo          Kubernetes     SYNCED     SYNCED     SYNCED     SYNCED     NOT SENT     istiod-install-istio-system-bd58bdcd5-2htkf     1.20.8
reviews-v2-5c7ff5b77b-5bpc4.bookinfo          Kubernetes     SYNCED     SYNCED     SYNCED     SYNCED     NOT SENT     istiod-install-istio-system-bd58bdcd5-2htkf     1.20.8
reviews-v3-5c5d764c9b-mk8vn.bookinfo          Kubernetes     SYNCED     SYNCED     SYNCED     SYNCED     NOT SENT     istiod-install-istio-system-bd58bdcd5-2htkf     1.20.8

    Sample output istio-system3

    $ istioctl ps -i istio-system3
NAME                                          CLUSTER        CDS                LDS                EDS                RDS                ECDS        ISTIOD                            VERSION
details-v1-57f6466bdc-5krth.bookinfo2         Kubernetes     SYNCED (2m40s)     SYNCED (2m40s)     SYNCED (2m34s)     SYNCED (2m40s)     IGNORED     istiod-ossm3-5b46b6b8cb-gbjx6     1.23.0
productpage-v1-5b84ccdddf-f8d9t.bookinfo2     Kubernetes     SYNCED (2m39s)     SYNCED (2m39s)     SYNCED (2m34s)     SYNCED (2m39s)     IGNORED     istiod-ossm3-5b46b6b8cb-gbjx6     1.23.0
ratings-v1-fb764cb99-kx2dr.bookinfo2          Kubernetes     SYNCED (2m40s)     SYNCED (2m40s)     SYNCED (2m34s)     SYNCED (2m40s)     IGNORED     istiod-ossm3-5b46b6b8cb-gbjx6     1.23.0
reviews-v1-8bd5549cf-xqqmd.bookinfo2          Kubernetes     SYNCED (2m40s)     SYNCED (2m40s)     SYNCED (2m34s)     SYNCED (2m40s)     IGNORED     istiod-ossm3-5b46b6b8cb-gbjx6     1.23.0
reviews-v2-7f7cc8bf5c-5rvln.bookinfo2         Kubernetes     SYNCED (2m40s)     SYNCED (2m40s)     SYNCED (2m34s)     SYNCED (2m40s)     IGNORED     istiod-ossm3-5b46b6b8cb-gbjx6     1.23.0
reviews-v3-84f674b88c-ftcqg.bookinfo2         Kubernetes     SYNCED (2m40s)     SYNCED (2m40s)     SYNCED (2m34s)     SYNCED (2m40s)     IGNORED     istiod-ossm3-5b46b6b8cb-gbjx6     1.23.0

2.3. Additional resources

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