Version 1.7

Installing Anthos Service Mesh on GKE on AWS

This guide explains how to do a clean installation of Anthos Service Mesh version 1.7.3-asm.6 on an existing GKE on AWS cluster.

With Anthos Service Mesh, the Istio Ingress Gateway comes preinstalled. But if you prefer to use an ingress controller, you can use Anthos Service Mesh to set up a Kubernetes Ingress resource. This guide shows you how to install Anthos Service Mesh and optionally set up a Kubernetes Ingress resource.

Before you begin

Before you begin the Anthos Service Mesh installation, make sure you have performed the following tasks:

Requirements

  • Make sure the user cluster that you install Anthos Service Mesh on has at least 4 vCPUs, 15 GB memory, and 4 replicas.

  • Review Naming service ports before you deploy workloads.

  • Make sure your cluster version is listed in Supported environments.

Restrictions

A Google Cloud project can only have one mesh associated with it.

Set up your environment

You need the following tools on the machine you want to install Anthos Service Mesh from. Note that you can install Anthos Service Mesh only on a user cluster, not an admin cluster.

  • The curl command-line tool.
  • The Cloud SDK (the gcloud command-line tool).

After installing the Cloud SDK:

  1. Authenticate with the Cloud SDK:

    gcloud auth login
    
  2. Update the components:

    gcloud components update
    
  3. Install kubectl:

    gcloud components install kubectl
    
  4. If you want to deploy and test your installation with the Online Boutique sample application, install kpt:

    gcloud components install kpt
    
  5. Switch context to your user cluster:

    kubectl config use-context CLUSTER_NAME
  6. Grant cluster admin permissions to your user account (your Google Cloud login email address). You need these permissions to create the necessary role based access control (RBAC) rules for Anthos Service Mesh:

    kubectl create clusterrolebinding cluster-admin-binding \
      --clusterrole=cluster-admin \
      --user=USER_ACCOUNT

Download the installation file

  1. Download the Anthos Service Mesh installation file to your current working directory:

    curl -LO https://storage.googleapis.com/gke-release/asm/istio-1.7.3-asm.6-linux-amd64.tar.gz
  2. Download the signature file and use openssl to verify the signature:

    curl -LO https://storage.googleapis.com/gke-release/asm/istio-1.7.3-asm.6-linux-amd64.tar.gz.1.sig
    openssl dgst -verify - -signature istio-1.7.3-asm.6-linux-amd64.tar.gz.1.sig istio-1.7.3-asm.6-linux-amd64.tar.gz <<'EOF'
    -----BEGIN PUBLIC KEY-----
    MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEWZrGCUaJJr1H8a36sG4UUoXvlXvZ
    wQfk16sxprI2gOJ2vFFggdq3ixF2h4qNBt0kI7ciDhgpwS8t+/960IsIgw==
    -----END PUBLIC KEY-----
    EOF

    The expected output is: Verified OK

  3. Extract the contents of the file to any location on your file system. For example, to extract the contents to the current working directory:

    tar xzf istio-1.7.3-asm.6-linux-amd64.tar.gz

    The command creates an installation directory in your current working directory named istio-1.7.3-asm.6. The istio-1.7.3-asm.6/bin directory contains the istioctl command-line tool that you use to install Anthos Service Mesh.

  4. Ensure that you're in the Anthos Service Mesh installation's root directory.

    cd istio-1.7.3-asm.6
  5. For convenience, add the /bin directory to your PATH:

    export PATH=$PWD/bin:$PATH

Create the istio-system namespace

Create a namespace called istio-system for the control plane components:

kubectl create namespace istio-system

Configure the validating webhook

When you install Anthos Service Mesh, you set a revision label on istiod. You need to set the same revision on the validating webhook.

Copy the following YAML to a file called istiod-service.yaml:

apiVersion: v1
kind: Service
metadata:
  name: istiod
  namespace: istio-system
  labels:
    istio.io/rev: asm-173-6
    app: istiod
    istio: pilot
    release: istio
spec:
  ports:
    - port: 15010
      name: grpc-xds # plaintext
      protocol: TCP
    - port: 15012
      name: https-dns # mTLS with k8s-signed cert
      protocol: TCP
    - port: 443
      name: https-webhook # validation and injection
      targetPort: 15017
      protocol: TCP
    - port: 15014
      name: http-monitoring # prometheus stats
      protocol: TCP
  selector:
    app: istiod
    istio.io/rev: asm-173-6

Installing Anthos Service Mesh

This section explains how to install Anthos Service Mesh on your user cluster, which enables the Supported default features listed on the Supported features page for the asm-multicloud profile. You can choose to enable Ingress for the public subnet or the private subnet.

Public

  1. Install Anthos Service Mesh:

    istioctl install \
      --set profile=asm-multicloud \
      --set revision=asm-173-6
    

    The --set revision argument adds a revision label in the format istio.io/rev=asm-173-6 to istiod. The revision label is used by the automatic sidecar injector webhook to associate injected sidecars with a particular istiod revision. To enable sidecar auto-injection for a namespace, you must label it with a revision that matches the label on istiod.

  2. Configure the validating webhook so that it can locate the istiod service with the revision label:

    kubectl apply -f istiod-service.yaml
    

    This command creates a service entry that lets the validating webhook automatically check configurations before they are applied.

Private

In the following, you add the service.beta.kubernetes.io/aws-load-balancer-internal annotation to all services that Anthos Service Mesh creates. When this annotation is present, GKE on AWS creates private Ingress services.

  1. Save the following YAML to a file called istio-operator-internal-lb.yaml:

    apiVersion: install.istio.io/v1alpha1
    kind: IstioOperator
    spec:
      components:
        ingressGateways:
        - enabled: true
          k8s:
            serviceAnnotations:
              service.beta.kubernetes.io/aws-load-balancer-internal: "true"
    
  2. Install Anthos Service Mesh:

    istioctl install \
     --set profile=asm-multicloud \
     --set revision=asm-173-6 \
     -f istio-operator-internal-lb.yaml
    

    The --set revision argument adds a revision label in the format istio.io/rev=asm-173-6 to istiod. The revision label is used by the automatic sidecar injector webhook to associate injected sidecars with a particular istiod revision. To enable sidecar auto-injection for a namespace, you must label it with a revision that matches the label on istiod.

  3. Configure the validating webhook so that it can locate the istiod service with the revision label:

    kubectl apply -f istiod-service.yaml
    

    This command creates a service entry that lets the validating webhook automatically check configurations before they are applied.

Installing without Prometheus and Kiali

By default, Anthos Service Mesh installs Prometheus and Kiali from their original package repositories at docker.io and quay.io. If you don't want to install these tools or allow connections to these repositories, pass -set addonComponents.prometheus.enabled=false and --set addonComponents.kiali.enabled=false to istioctl install. For example, use the following command to exclude Prometheus and Kiali from the public subnet installation installation.

  istioctl install \
    --set profile=asm-multicloud \
    --set addonComponents.prometheus.enabled=false \
    --set addonComponents.kiali.enabled=false \
    --revision=asm-173-6

Check the control plane components

Check that the control plane pods in istio-system are up:

kubectl get pod -n istio-system

Expected output is similar to the following:

NAME                                      READY   STATUS      RESTARTS   AGE
istio-ingressgateway-74cc894bfd-786rg     1/1     Running     0          7m19s
istiod-78cdbbbdb-d7tps                    1/1     Running     0          7m36s
promsd-576b8db4d6-lqf64                   2/2     Running     1          7m19s

Injecting sidecar proxies

Anthos Service Mesh uses sidecar proxies to enhance network security, reliability, and observability. With Anthos Service Mesh, these functions are abstracted away from the application's primary container and implemented in a common out-of-process proxy delivered as a separate container in the same Pod. To inject your Pods with the sidecar proxy, you configure automatic sidecar proxy injection (auto-injection) by labeling your namespaces with the same revision label that you set on istiod when you installed Anthos Service Mesh.

  • You need to enable auto-injection on any namespaces with workloads that were running on your cluster before you installed Anthos Service Mesh.

  • Before you deploy new workloads, make sure to configure auto-injection so that Anthos Service Mesh can monitor and secure traffic.

To enable auto-injection:

  1. Use the following command to locate the revision label on istiod:

    kubectl -n istio-system get pods -l app=istiod --show-labels
    

    The output looks similar to the following:

    NAME                                READY   STATUS    RESTARTS   AGE   LABELS
    istiod-asm-173-6-5788d57586-bljj4   1/1     Running   0          23h   app=istiod,istio.io/rev=asm-173-6,istio=istiod,pod-template-hash=5788d57586
    istiod-asm-173-6-5788d57586-vsklm   1/1     Running   1          23h   app=istiod,istio.io/rev=asm-173-6,istio=istiod,pod-template-hash=5788d57586

    In the output, under the LABELS column, note the value of the istiod revision label, which follows the prefix istio.io/rev=. In this example, the value is asm-173-6.

  2. Apply the revision label and remove the istio-injection label if it exists. In the following command, NAMESPACE is the name of the namespace where you want to enable auto-injection, and REVISION is the revision label you noted in the previous step.

    kubectl label namespace NAMESPACE  istio-injection- istio.io/rev=REVISION --overwrite
    

    You can ignore the message "istio-injection not found" in the output. That means that the namespace didn't previously have the istio-injection label, which you should expect in new installations of Anthos Service Mesh or new deployments. Because auto-injection fails if a namespace has both the istio-injection and the revision label, all kubectl label commands in the Anthos Service Mesh documentation include removing the istio-injection label.

  3. If workloads were running on your cluster before you installed Anthos Service Mesh, restart the Pods to trigger re-injection.

    How you restart Pods depends on your application and the environment the cluster is in. For example, in your staging environment, you might simply delete all the Pods, which causes them to restart. But in your production environment, you might have a process that implements a blue-green deployment so that you can safely restart Pods to avoid traffic interruption.

    You can use kubectl to perform a rolling restart:

    kubectl rollout restart deployment -n NAMESPACE
    
  4. Verify that your Pods are configured to point to the new version of istiod.

    kubectl get pods -n NAMESPACE -l istio.io/rev=REVISION
    

Accessing the Ingress Gateway

Anthos Service Mesh provides a preconfigured Ingress Gateway, the istio-ingressgateway, that you can use to manage inbound traffic to applications running on your service mesh. To make applications accessible from outside of your cluster, (such as from a browser):

  • You need to get the external IP address or host name and port of the external load balancer that the istio-ingressgateway is configured to use.

  • Your application must define a Gateway and VirtualService resource, similar to the Online Boutique sample application's frontend-gateway.yaml.

To get the external address of the istio-ingressgateway:

  1. Create the INGRESS_HOST environment variable:

    export INGRESS_HOST=$(kubectl -n istio-system get service istio-ingressgateway -o jsonpath='{.status.loadBalancer.ingress[0].hostname}')
    
  2. Create the INGRESS_PORT environment variable:

    export INGRESS_PORT=$(kubectl -n istio-system get service istio-ingressgateway -o jsonpath='{.spec.ports[?(@.name=="http2")].port}')
    
  3. To test, deploy a sample application, such as the Online Boutique.

  4. To access the application on your browser, use the value of $INGRESS_HOST:$INGRESS_PORT in the URL.

What's next

Create an example deployment on GKE on AWS.