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ocp-service-mesh-foundations

Installing the Service Mesh involves :

  • Installing Elasticsearch, Jaeger, Kiali
  • Installing the Service Mesh Operator
  • Creating and managing a ServiceMeshControlPlane resource to deploy the Service Mesh control plane
  • Creating a ServiceMeshMemberRoll resource to specify the namespaces associated with the Service Mesh.

Verify Operator's installation

oc get ClusterServiceVersion
NAME                                        DISPLAY                          VERSION              REPLACES                     PHASE
elasticsearch-operator.4.3.5-202003020549   Elasticsearch Operator           4.3.5-202003020549                                Succeeded
jaeger-operator.v1.13.1                     Jaeger Operator                  1.13.1                                            Succeeded
kiali-operator.v1.0.11                      Kiali Operator                   1.0.11               kiali-operator.v1.0.10       Succeeded
servicemeshoperator.v1.0.9                  Red Hat OpenShift Service Mesh   1.0.9                servicemeshoperator.v1.0.8   Succeeded

View status after you install ServiceMeshControlPlane

oc get pods -n istio-system 
NAME                                     READY   STATUS    RESTARTS   AGE
grafana-65d9877595-ccmpv                 2/2     Running   0          5m44s
istio-citadel-b8cd4bb56-vs4f7            1/1     Running   0          7m39s
istio-egressgateway-769f47449-vdcsh      1/1     Running   0          6m25s
istio-galley-bb786f9f-xr5xw              1/1     Running   0          7m17s
istio-ingressgateway-6b84495b7c-kfclw    1/1     Running   0          6m25s
istio-pilot-7bfc869bc6-n56gt             2/2     Running   0          6m55s
istio-policy-77cbb47bb6-s6klc            2/2     Running   0          7m7s
istio-sidecar-injector-f4975d85d-99xhb   1/1     Running   0          5m57s
istio-telemetry-5c56bc5746-kmwhk         2/2     Running   0          7m6s
jaeger-645665785f-6vhxt                  2/2     Running   0          7m22s
kiali-86dc5bd4df-tkvvp                   1/1     Running   0          5m21s
prometheus-5856547667-wpzxw              2/2     Running   0          7m34s

Rule Configuration

VirtualService		Defines rules that control how requests for service are routed within service mesh
DestinationRule		Configures set of policies to be applied to request after VirtualService routing occurs
ServiceEntry		Enables requests to services outside service mesh
Gateway			Configures load balancer operating at edge of mesh for:
			  	• HTTP/TCP ingress traffic to mesh application
			  	• Egress traffic to external services
Sidecar			Configures sidecar proxies attached to application workloads running inside mesh

RedHat OpenShift Service Mesh Demo (Dynamic Routing and Blue/Green Deployments)

export OCP_TUTORIAL_PROJECT="service-mesh-demo"
oc new-project $OCP_TUTORIAL_PROJECT

Create catalog service

oc create -f ./catalog/kubernetes/catalog-service-template.yml -n $OCP_TUTORIAL_PROJECT
oc create -f ./catalog/kubernetes/Service.yml -n $OCP_TUTORIAL_PROJECT

Deploy Partner service version 1

oc create -f ./partner/kubernetes/partner-service-template.yml -n $OCP_TUTORIAL_PROJECT

Create an OpenShift service entry for the partner service

oc create -f ./partner/kubernetes/Service.yml -n $OCP_TUTORIAL_PROJECT

Deploy Gateway Service

oc create -f ./gateway/kubernetes/gateway-service-template.yml 
oc create -f ./gateway/kubernetes/Service.yml

Expose Gateway Service

oc apply -f gateway/kubernetes/service-mesh-gw.yaml -n $OCP_TUTORIAL_PROJECT

Deploy the catalog-v2 service

oc create -f ./catalog-v2/kubernetes/catalog-service-template.yml -n $OCP_TUTORIAL_PROJECT

Verify OpenShift round-robin load-balancing

export GATEWAY_URL=$(oc -n istio-system get route istio-ingressgateway -o jsonpath='{.spec.host}')
for i in $(seq 50) ; do curl  $GATEWAY_URL; sleep 1 ; done

View catalog deployment

oc describe service catalog -n $OCP_TUTORIAL_PROJECT | grep Selector
oc get deploy catalog-v1 -o json -n $OCP_TUTORIAL_PROJECT | jq .spec.template.metadata.labels

Route All Traffic 90/10

oc apply -f ./istiofiles/destination-rule-catalog-v1-v2.yml
oc apply -f ./istiofiles/virtual-service-catalog-v1_and_v2.yml