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Flagger Install on EKS App Mesh
This guide walks you through setting up Flagger and AWS App Mesh on EKS.
App Mesh
The App Mesh integration with EKS is made out of the following components:
- Kubernetes custom resources
mesh.appmesh.k8s.awsdefines a logical boundary for network traffic between the servicesvirtualnode.appmesh.k8s.awsdefines a logical pointer to a Kubernetes workloadvirtualservice.appmesh.k8s.awsdefines the routing rules for a workload inside the mesh
- CRD controller - keeps the custom resources in sync with the App Mesh control plane
- Admission controller - injects the Envoy sidecar and assigns Kubernetes pods to App Mesh virtual nodes
- Telemetry service - Prometheus instance that collects and stores Envoy's metrics
Create a Kubernetes cluster
In order to create an EKS cluster you can use eksctl. Eksctl is an open source command-line utility made by Weaveworks in collaboration with Amazon.
On MacOS you can install eksctl with Homebrew:
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brew tap weaveworks/tap
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brew install weaveworks/tap/eksctl
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Create an EKS cluster with:
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eksctl create cluster --name=appmesh \
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--region=us-west-2 \
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--nodes 3 \
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--node-volume-size=120 \
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--appmesh-access
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The above command will create a two nodes cluster with App Mesh IAM policy attached to the EKS node instance role.
Verify the install with:
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kubectl get nodes
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Install Helm
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brew install helm
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Add the EKS repository to Helm:
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helm repo add eks https://aws.github.io/eks-charts
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Enable horizontal pod auto-scaling
Install the Horizontal Pod Autoscaler (HPA) metrics provider:
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helm upgrade -i metrics-server stable/metrics-server \
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--namespace kube-system \
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--set args[0]=--kubelet-preferred-address-types=InternalIP
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After a minute, the metrics API should report CPU and memory usage for pods. You can very the metrics API with:
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kubectl -n kube-system top pods
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Install the App Mesh components
Install the App Mesh CRDs:
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kubectl apply -k github.com/aws/eks-charts/stable/appmesh-controller//crds?ref=master
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Create the
appmesh-system namespace:1
kubectl create ns appmesh-system
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Install the App Mesh controller:
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helm upgrade -i appmesh-controller eks/appmesh-controller \
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--wait --namespace appmesh-system
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In order to collect the App Mesh metrics that Flagger needs to run the canary analysis, you'll need to setup a Prometheus instance to scrape the Envoy sidecars.
Install the App Mesh Prometheus:
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helm upgrade -i appmesh-prometheus eks/appmesh-prometheus \
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--wait --namespace appmesh-system
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Install Flagger
Add Flagger Helm repository:
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helm repo add flagger https://flagger.app
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Install Flagger's Canary CRD:
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kubectl apply -f https://raw.githubusercontent.com/fluxcd/flagger/main/artifacts/flagger/crd.yaml
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Deploy Flagger in the appmesh-system namespace:
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helm upgrade -i flagger flagger/flagger \
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--namespace=appmesh-system \
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--set crd.create=false \
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--set meshProvider=appmesh:v1beta2 \
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--set metricsServer=http://appmesh-prometheus:9090
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Install Grafana
Deploy App Mesh Grafana that comes with a dashboard for monitoring Flagger's canary releases:
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helm upgrade -i appmesh-grafana eks/appmesh-grafana \
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--namespace appmesh-system
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You can access Grafana using port forwarding:
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kubectl -n appmesh-system port-forward svc/appmesh-grafana 3000:3000
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