You can use Istio to enable service mesh features such as traffic management, observability, and security. Istio can be provisioned using Anthos Service Mesh (ASM), the Open Source Software (OSS) istioctl tool, or via other Istio providers. You can then label individual namespaces for sidecar injection and configure an Istio gateway to replace the frontend-external load balancer.
Create a GKE cluster with at least 4 nodes, machine type e2-standard-4, GKE Workload Identity, and the Kubernetes Gateway API resources:
Note: using the classic istio-ingressgateway instead of Gateway API is another option not covered in this component.
PROJECT_ID="<your-project-id>"
ZONE="<your-GCP-zone>"
CLUSTER_NAME="onlineboutique"
gcloud container clusters create ${CLUSTER_NAME} \
--project=${PROJECT_ID} \
--zone=${ZONE} \
--machine-type=e2-standard-4 \
--num-nodes=4 \
--workload-pool ${PROJECT_ID}.svc.id.goog \
--gateway-api "standard"ASM provides a managed service mesh experience that includes Managed Control Plane (MCP) and Managed Data Plane (MDP) upgrades.
The recommended way to install ASM is using the fleet feature API:
# Enable ASM and Fleet APIs
gcloud services enable mesh.googleapis.com --project ${PROJECT_ID}
# Register GKE cluster with Fleet
gcloud container fleet memberships register ${CLUSTER_NAME} \
--gke-cluster ${ZONE}/${CLUSTER_NAME} \
--enable-workload-identity
FLEET_PROJECT_NUMBER=$(gcloud projects describe ${PROJECT_ID} --format 'value(projectNumber)')
# Apply mesh_id label to clusters that should be added to the service mesh
gcloud container clusters update --project ${PROJECT_ID} ${CLUSTER_NAME} \
--zone ${ZONE} --update-labels="mesh_id=proj-$FLEET_PROJECT_NUMBER"
# Enable managed Anthos Service Mesh on the cluster
gcloud container fleet mesh update --project ${PROJECT_ID} \
--management automatic \
--memberships ${CLUSTER_NAME}
# Enable sidecar injection for Kubernetes namespace where workload is deployed
kubectl label namespace default istio-injection- istio.io/rev=asm-managed --overwriteNote: You can ignore any label "istio-injection" not found errors. The istio-injection=enabled annotation would also work but ASM prefers revision labels.
Follow the Managed ASM Verification steps to confirm it is working.
Alternatively you can install OSS Istio by following the getting started guide:
# Install istio 1.17 or above
istioctl install --set profile=minimal -y
# Enable sidecar injection for Kubernetes namespace(s) where microservices-demo is deployed
kubectl label namespace default istio-injection=enabled
# Make sure the istiod injection webhook port 15017 is accessible via GKE master nodes
# Otherwise your replicaset-controller may be blocked when trying to create new pods with:
# Error creating: Internal error occurred: failed calling
# webhook "namespace.sidecar-injector.istio.io" ... context deadline exceeded
gcloud compute firewall-rules list --filter="name~gke-[0-9a-z-]*-master"
NAME NETWORK DIRECTION PRIORITY ALLOW DENY DISABLED
gke-onlineboutique-c94d71e8-master gke-vpc INGRESS 1000 tcp:10250,tcp:443 False
# Update firewall rule (or create a new one) to allow webhook port 15017
gcloud compute firewall-rules update gke-onlineboutique-c94d71e8-master \
--allow tcp:10250,tcp:443,tcp:15017Once the service mesh and namespace injection are configured, you can then deploy the Istio manifests using Kustomize. You should also include the service-accounts component if you plan on using AuthorizationPolicies.
From the kustomize/ folder at the root level of this repository, execute these commands:
kustomize edit add component components/service-accounts
kustomize edit add component components/service-mesh-istioThis will update the kustomize/kustomization.yaml file which could be similar to:
apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization
resources:
- base
components:
- components/service-accounts
- components/service-mesh-istioNote: service-mesh-istio component includes the same delete patch as the non-public-frontend component. Trying to use both those components in your kustomization.yaml file will result in an error.
You can locally render these manifests by running kubectl kustomize . or deploying them by running kubectl apply -k .
The output should be similar to:
serviceaccount/adservice created
serviceaccount/cartservice created
serviceaccount/checkoutservice created
serviceaccount/currencyservice created
serviceaccount/emailservice created
serviceaccount/frontend created
serviceaccount/loadgenerator created
serviceaccount/paymentservice created
serviceaccount/productcatalogservice created
serviceaccount/recommendationservice created
serviceaccount/shippingservice created
service/adservice created
service/cartservice created
service/checkoutservice created
service/currencyservice created
service/emailservice created
service/frontend created
service/paymentservice created
service/productcatalogservice created
service/recommendationservice created
service/redis-cart created
service/shippingservice created
deployment.apps/adservice created
deployment.apps/cartservice created
deployment.apps/checkoutservice created
deployment.apps/currencyservice created
deployment.apps/emailservice created
deployment.apps/frontend created
deployment.apps/loadgenerator created
deployment.apps/paymentservice created
deployment.apps/productcatalogservice created
deployment.apps/recommendationservice created
deployment.apps/redis-cart created
deployment.apps/shippingservice created
gateway.gateway.networking.k8s.io/istio-gateway created
httproute.gateway.networking.k8s.io/frontend-route created
serviceentry.networking.istio.io/allow-egress-google-metadata created
serviceentry.networking.istio.io/allow-egress-googleapis created
virtualservice.networking.istio.io/frontend created
Run kubectl get pods,gateway,svc to see pods and gateway are in a healthy and ready state.
The output should be similar to:
NAME READY STATUS RESTARTS AGE
pod/adservice-6cbd9794f9-8c4gv 2/2 Running 0 47s
pod/cartservice-667bbd5f6-84j8v 2/2 Running 0 47s
pod/checkoutservice-547557f445-bw46n 2/2 Running 0 47s
pod/currencyservice-6bd8885d9c-2cszv 2/2 Running 0 47s
pod/emailservice-64997dcf97-8fpsd 2/2 Running 0 47s
pod/frontend-c54778dcf-wbgmr 2/2 Running 0 46s
pod/istio-gateway-istio-8577b948c6-cxl8j 1/1 Running 0 45s
pod/loadgenerator-ccfd4d598-jh6xj 2/2 Running 0 46s
pod/paymentservice-79b77cd7c-6hth7 2/2 Running 0 46s
pod/productcatalogservice-5f75795545-nk5wv 2/2 Running 0 46s
pod/recommendationservice-56dd4c7df5-gnwwr 2/2 Running 0 46s
pod/redis-cart-799c85c644-pxsvt 2/2 Running 0 46s
pod/shippingservice-64f8df74f5-7wllf 2/2 Running 0 45s
NAME CLASS ADDRESS READY AGE
gateway.gateway.networking.k8s.io/istio-gateway istio 35.247.123.146 True 45s
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
service/adservice ClusterIP 10.68.231.142 <none> 9555/TCP 49s
service/cartservice ClusterIP 10.68.184.25 <none> 7070/TCP 49s
service/checkoutservice ClusterIP 10.68.177.213 <none> 5050/TCP 49s
service/currencyservice ClusterIP 10.68.249.87 <none> 7000/TCP 49s
service/emailservice ClusterIP 10.68.205.123 <none> 5000/TCP 49s
service/frontend ClusterIP 10.68.94.203 <none> 80/TCP 48s
service/istio-gateway-istio LoadBalancer 10.68.147.158 35.247.123.146 15021:30376/TCP,80:30332/TCP 45s
service/kubernetes ClusterIP 10.68.0.1 <none> 443/TCP 65m
service/paymentservice ClusterIP 10.68.114.19 <none> 50051/TCP 48s
service/productcatalogservice ClusterIP 10.68.240.153 <none> 3550/TCP 48s
service/recommendationservice ClusterIP 10.68.117.97 <none> 8080/TCP 48s
service/redis-cart ClusterIP 10.68.189.126 <none> 6379/TCP 48s
service/shippingservice ClusterIP 10.68.221.62 <none> 50051/TCP 48s
Find the IP address of your Istio gateway and visit the application frontend in a web browser.
INGRESS_HOST="$(kubectl get gateway istio-gateway \
-o jsonpath='{.status.addresses[*].value}')"
curl -v "http://$INGRESS_HOST"