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| 1 | +# Running Red Hat OpenShift Service Mesh (OSSM) 2 and OSSM 3 side by side |
| 2 | +This section describes how to run OSSM 2 and OSSM 3 side by side in one cluster without interfering with each other. |
| 3 | +> **_NOTE:_** It's not OSSM 2 -> OSSM 3 migration guide. |
| 4 | +
|
| 5 | +To better understand the steps described here, it's recommended to read the OSSM 2 [deployment models](https://docs.redhat.com/en/documentation/openshift_container_platform/4.17/html/service_mesh/service-mesh-2-x#ossm-deployment-models) and upstream Istio [Multiple Control Planes](https://istio.io/latest/docs/setup/install/multiple-controlplanes/) documentation. This document assumes OSSM 2.6 is already running and the goal is to install OSSM 3.0 on the same cluster without interfering with the OSSM 2.6 installation. |
| 6 | + |
| 7 | +Follow the steps described below for your OSSM 2 deployment model (Multi-tenant or Cluster-Wide). |
| 8 | + |
| 9 | +## Multitenant (default) deployment model |
| 10 | +There are no changes required on OSSM 2 side. For OSSM 3 installation, see [OSSM 3 installation](#ossm-3-installation) below. |
| 11 | + |
| 12 | +## Cluster-Wide (Single Tenant) mesh deployment model |
| 13 | +### Required OSSM 2 changes for Cluster-Wide model |
| 14 | +To be able to run OSSM 2 in cluster-wide mode with OSSM 3, it's required to make configuration changes on OSSM 2 side as well. |
| 15 | +As the control plane with the cluster-wide model watches all namespaces, it's required to restrict that to namespaces only belonging to the OSSM 2 mesh. Otherwise it would conflict with OSSM 3. Restricting your control plane can be done either with [discovery selectors](https://docs.redhat.com/en/documentation/openshift_container_platform/4.17/html/service_mesh/service-mesh-2-x#ossm-excluding-namespaces-from-cluster-wide-mesh-console_ossm-deployment-models) or by switching to a multi-tenant deployment model. |
| 16 | +1. configure discovery selectors in your SMCP CR: |
| 17 | + ```yaml |
| 18 | + apiVersion: maistra.io/v2 |
| 19 | + kind: ServiceMeshControlPlane |
| 20 | + metadata: |
| 21 | + name: basic |
| 22 | + namespace: istio-system |
| 23 | + spec: |
| 24 | + policy: |
| 25 | + type: Istiod |
| 26 | + addons: |
| 27 | + grafana: |
| 28 | + enabled: false |
| 29 | + kiali: |
| 30 | + enabled: true |
| 31 | + prometheus: |
| 32 | + enabled: true |
| 33 | + telemetry: |
| 34 | + type: Istiod |
| 35 | + version: v2.6 |
| 36 | + mode: ClusterWide |
| 37 | + meshConfig: |
| 38 | + discoverySelectors: |
| 39 | + - matchExpressions: |
| 40 | + - key: maistra.io/member-of |
| 41 | + operator: Exists |
| 42 | + runtime: |
| 43 | + components: |
| 44 | + pilot: |
| 45 | + container: |
| 46 | + env: |
| 47 | + ENABLE_ENHANCED_RESOURCE_SCOPING: 'true' |
| 48 | + ``` |
| 49 | +
|
| 50 | +### OSSM 3 installation |
| 51 | +See OSSM [installation](https://docs.openshift.com/service-mesh/3.0.0tp1/install/ossm-installing-openshift-service-mesh.html) documentation for more information. |
| 52 | +1. install `Red Hat OpenShift Service Mesh 3` operator |
| 53 | +1. create `IstioCNI` resource in `istio-cni` namespace |
| 54 | +1. create following `Istio` resource in `istio-system3` (must be a different namespace than a namespace running OSSM 2). Make sure to use discovery selectors which are ignoring OSSM 2 namespaces and NOT to use `default` name for `Istio` resource. You can optionally restrict discovered namespaces even more. Configuration shown in the example only ignores OSSM 2 namespaces but all other namespaces will be part of OSSM 3 mesh. See upstream Istio documentation for [discoverySelectors](https://istio.io/v1.19/docs/setup/install/multiple-controlplanes/) usage. |
| 55 | + ```yaml |
| 56 | + kind: Istio |
| 57 | + apiVersion: sailoperator.io/v1alpha1 |
| 58 | + metadata: |
| 59 | + name: ossm3 |
| 60 | + spec: |
| 61 | + namespace: istio-system3 |
| 62 | + values: |
| 63 | + meshConfig: |
| 64 | + discoverySelectors: |
| 65 | + - matchExpressions: |
| 66 | + - key: maistra.io/member-of |
| 67 | + operator: DoesNotExist |
| 68 | + updateStrategy: |
| 69 | + type: InPlace |
| 70 | + version: v1.23.0 |
| 71 | + ``` |
| 72 | +1. Deploy your workloads and label the namespaces with `istio.io/rev=ossm3` label |
| 73 | + > **_NOTE:_** Do NOT use `istio-injection=enabled` label for your OSSM 3 workload namespaces unless you have changed `spec.memberSelectors` in `ServiceMeshMemberRoll`. |
| 74 | +1. You can use the `istioctl ps` command to confirm that the application workloads are managed by their respective control plane: |
| 75 | + ```sh |
| 76 | + $ istioctl ps -i istio-system |
| 77 | + NAME CLUSTER CDS LDS EDS RDS ECDS ISTIOD VERSION |
| 78 | + details-v1-7f46897b-88x4l.bookinfo Kubernetes SYNCED SYNCED SYNCED SYNCED NOT SENT istiod-install-istio-system-bd58bdcd5-2htkf 1.20.8 |
| 79 | + mongodb-v1-6cf7dc9885-7nlmq.bookinfo Kubernetes SYNCED SYNCED SYNCED SYNCED NOT SENT istiod-install-istio-system-bd58bdcd5-2htkf 1.20.8 |
| 80 | + mysqldb-v1-7c4c44b9b4-22b57.bookinfo Kubernetes SYNCED SYNCED SYNCED SYNCED NOT SENT istiod-install-istio-system-bd58bdcd5-2htkf 1.20.8 |
| 81 | + productpage-v1-6f9c6589cb-l6rvg.bookinfo Kubernetes SYNCED SYNCED SYNCED SYNCED NOT SENT istiod-install-istio-system-bd58bdcd5-2htkf 1.20.8 |
| 82 | + ratings-v1-559b64556-f6b4l.bookinfo Kubernetes SYNCED SYNCED SYNCED SYNCED NOT SENT istiod-install-istio-system-bd58bdcd5-2htkf 1.20.8 |
| 83 | + ratings-v2-8ddc4d65c-bztrg.bookinfo Kubernetes SYNCED SYNCED SYNCED SYNCED NOT SENT istiod-install-istio-system-bd58bdcd5-2htkf 1.20.8 |
| 84 | + ratings-v2-mysql-cbc957476-m5j7w.bookinfo Kubernetes SYNCED SYNCED SYNCED SYNCED NOT SENT istiod-install-istio-system-bd58bdcd5-2htkf 1.20.8 |
| 85 | + reviews-v1-847fb7c54d-7dwt7.bookinfo Kubernetes SYNCED SYNCED SYNCED SYNCED NOT SENT istiod-install-istio-system-bd58bdcd5-2htkf 1.20.8 |
| 86 | + reviews-v2-5c7ff5b77b-5bpc4.bookinfo Kubernetes SYNCED SYNCED SYNCED SYNCED NOT SENT istiod-install-istio-system-bd58bdcd5-2htkf 1.20.8 |
| 87 | + reviews-v3-5c5d764c9b-mk8vn.bookinfo Kubernetes SYNCED SYNCED SYNCED SYNCED NOT SENT istiod-install-istio-system-bd58bdcd5-2htkf 1.20.8 |
| 88 | + ``` |
| 89 | + ```sh |
| 90 | + $ istioctl ps -i istio-system3 |
| 91 | + NAME CLUSTER CDS LDS EDS RDS ECDS ISTIOD VERSION |
| 92 | + details-v1-57f6466bdc-5krth.bookinfo2 Kubernetes SYNCED (2m40s) SYNCED (2m40s) SYNCED (2m34s) SYNCED (2m40s) IGNORED istiod-ossm3-5b46b6b8cb-gbjx6 1.23.0 |
| 93 | + productpage-v1-5b84ccdddf-f8d9t.bookinfo2 Kubernetes SYNCED (2m39s) SYNCED (2m39s) SYNCED (2m34s) SYNCED (2m39s) IGNORED istiod-ossm3-5b46b6b8cb-gbjx6 1.23.0 |
| 94 | + ratings-v1-fb764cb99-kx2dr.bookinfo2 Kubernetes SYNCED (2m40s) SYNCED (2m40s) SYNCED (2m34s) SYNCED (2m40s) IGNORED istiod-ossm3-5b46b6b8cb-gbjx6 1.23.0 |
| 95 | + reviews-v1-8bd5549cf-xqqmd.bookinfo2 Kubernetes SYNCED (2m40s) SYNCED (2m40s) SYNCED (2m34s) SYNCED (2m40s) IGNORED istiod-ossm3-5b46b6b8cb-gbjx6 1.23.0 |
| 96 | + reviews-v2-7f7cc8bf5c-5rvln.bookinfo2 Kubernetes SYNCED (2m40s) SYNCED (2m40s) SYNCED (2m34s) SYNCED (2m40s) IGNORED istiod-ossm3-5b46b6b8cb-gbjx6 1.23.0 |
| 97 | + reviews-v3-84f674b88c-ftcqg.bookinfo2 Kubernetes SYNCED (2m40s) SYNCED (2m40s) SYNCED (2m34s) SYNCED (2m40s) IGNORED istiod-ossm3-5b46b6b8cb-gbjx6 1.23.0 |
| 98 | + ``` |
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